setmetatable(_G, { __index = function(t, k) if not rawget(t, k) then error("cannot get undefined global variable: " .. k, 2) end end, __newindex = function(t, k) error("cannot set global variable: " .. k, 2) end  })

-- Begin rxi JSON library.
local json = { _version = "0.1.2" }
local encode
local escape_char_map = {
  [ "\\" ] = "\\",
  [ "\"" ] = "\"",
  [ "\b" ] = "b",
  [ "\f" ] = "f",
  [ "\n" ] = "n",
  [ "\r" ] = "r",
  [ "\t" ] = "t",
}

local escape_char_map_inv = { [ "/" ] = "/" }
for k, v in pairs(escape_char_map) do
  escape_char_map_inv[v] = k
end


local function escape_char(c)
  return "\\" .. (escape_char_map[c] or string.format("u%04x", c:byte()))
end


local function encode_nil(val)
  return "null"
end


local function encode_table(val, stack)
  local res = {}
  stack = stack or {}

  -- Circular reference?
  if stack[val] then error("circular reference") end

  stack[val] = true

  if rawget(val, 1) ~= nil or next(val) == nil then
    -- Treat as array -- check keys are valid and it is not sparse
    local n = 0
    for k in pairs(val) do
      if type(k) ~= "number" then
        error("invalid table: mixed or invalid key types")
      end
      n = n + 1
    end
    if n ~= #val then
      error("invalid table: sparse array")
    end
    -- Encode
    for i, v in ipairs(val) do
      table.insert(res, encode(v, stack))
    end
    stack[val] = nil
    return "[" .. table.concat(res, ",") .. "]"

  else
    -- Treat as an object
    for k, v in pairs(val) do
      if type(k) ~= "string" then
        error("invalid table: mixed or invalid key types")
      end
      table.insert(res, encode(k, stack) .. ":" .. encode(v, stack))
    end
    stack[val] = nil
    return "{" .. table.concat(res, ",") .. "}"
  end
end


local function encode_string(val)
  return '"' .. val:gsub('[%z\1-\31\\"]', escape_char) .. '"'
end


local function encode_number(val)
  -- Check for NaN, -inf and inf
  if val ~= val or val <= -math.huge or val >= math.huge then
    error("unexpected number value '" .. tostring(val) .. "'")
  end
  return string.format("%.14g", val)
end


local type_func_map = {
  [ "nil"     ] = encode_nil,
  [ "table"   ] = encode_table,
  [ "string"  ] = encode_string,
  [ "number"  ] = encode_number,
  [ "boolean" ] = tostring,
}


encode = function(val, stack)
  local t = type(val)
  local f = type_func_map[t]
  if f then
    return f(val, stack)
  end
  error("unexpected type '" .. t .. "'")
end


function json.encode(val)
  return ( encode(val) )
end

local parse

local function create_set(...)
  local res = {}
  for i = 1, select("#", ...) do
    res[ select(i, ...) ] = true
  end
  return res
end

local space_chars   = create_set(" ", "\t", "\r", "\n")
local delim_chars   = create_set(" ", "\t", "\r", "\n", "]", "}", ",")
local escape_chars  = create_set("\\", "/", '"', "b", "f", "n", "r", "t", "u")
local literals      = create_set("true", "false", "null")

local literal_map = {
  [ "true"  ] = true,
  [ "false" ] = false,
  [ "null"  ] = nil,
}


local function next_char(str, idx, set, negate)
  for i = idx, #str do
    if set[str:sub(i, i)] ~= negate then
      return i
    end
  end
  return #str + 1
end


local function decode_error(str, idx, msg)
  local line_count = 1
  local col_count = 1
  for i = 1, idx - 1 do
    col_count = col_count + 1
    if str:sub(i, i) == "\n" then
      line_count = line_count + 1
      col_count = 1
    end
  end
  error( string.format("%s at line %d col %d", msg, line_count, col_count) )
end


local function codepoint_to_utf8(n)
  -- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa
  local f = math.floor
  if n <= 0x7f then
    return string.char(n)
  elseif n <= 0x7ff then
    return string.char(f(n / 64) + 192, n % 64 + 128)
  elseif n <= 0xffff then
    return string.char(f(n / 4096) + 224, f(n % 4096 / 64) + 128, n % 64 + 128)
  elseif n <= 0x10ffff then
    return string.char(f(n / 262144) + 240, f(n % 262144 / 4096) + 128,
                       f(n % 4096 / 64) + 128, n % 64 + 128)
  end
  error( string.format("invalid unicode codepoint '%x'", n) )
end


local function parse_unicode_escape(s)
  local n1 = tonumber( s:sub(1, 4),  16 )
  local n2 = tonumber( s:sub(7, 10), 16 )
   -- Surrogate pair?
  if n2 then
    return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000)
  else
    return codepoint_to_utf8(n1)
  end
end


local function parse_string(str, i)
  local res = ""
  local j = i + 1
  local k = j

  while j <= #str do
    local x = str:byte(j)

    if x < 32 then
      decode_error(str, j, "control character in string")

    elseif x == 92 then -- `\`: Escape
      res = res .. str:sub(k, j - 1)
      j = j + 1
      local c = str:sub(j, j)
      if c == "u" then
        local hex = str:match("^[dD][89aAbB]%x%x\\u%x%x%x%x", j + 1)
                 or str:match("^%x%x%x%x", j + 1)
                 or decode_error(str, j - 1, "invalid unicode escape in string")
        res = res .. parse_unicode_escape(hex)
        j = j + #hex
      else
        if not escape_chars[c] then
          decode_error(str, j - 1, "invalid escape char '" .. c .. "' in string")
        end
        res = res .. escape_char_map_inv[c]
      end
      k = j + 1

    elseif x == 34 then -- `"`: End of string
      res = res .. str:sub(k, j - 1)
      return res, j + 1
    end

    j = j + 1
  end

  decode_error(str, i, "expected closing quote for string")
end


local function parse_number(str, i)
  local x = next_char(str, i, delim_chars)
  local s = str:sub(i, x - 1)
  local n = tonumber(s)
  if not n then
    decode_error(str, i, "invalid number '" .. s .. "'")
  end
  return n, x
end


local function parse_literal(str, i)
  local x = next_char(str, i, delim_chars)
  local word = str:sub(i, x - 1)
  if not literals[word] then
    decode_error(str, i, "invalid literal '" .. word .. "'")
  end
  return literal_map[word], x
end


local function parse_array(str, i)
  local res = {}
  local n = 1
  i = i + 1
  while 1 do
    local x
    i = next_char(str, i, space_chars, true)
    -- Empty / end of array?
    if str:sub(i, i) == "]" then
      i = i + 1
      break
    end
    -- Read token
    x, i = parse(str, i)
    res[n] = x
    n = n + 1
    -- Next token
    i = next_char(str, i, space_chars, true)
    local chr = str:sub(i, i)
    i = i + 1
    if chr == "]" then break end
    if chr ~= "," then decode_error(str, i, "expected ']' or ','") end
  end
  return res, i
end


local function parse_object(str, i)
  local res = {}
  i = i + 1
  while 1 do
    local key, val
    i = next_char(str, i, space_chars, true)
    -- Empty / end of object?
    if str:sub(i, i) == "}" then
      i = i + 1
      break
    end
    -- Read key
    if str:sub(i, i) ~= '"' then
      decode_error(str, i, "expected string for key")
    end
    key, i = parse(str, i)
    -- Read ':' delimiter
    i = next_char(str, i, space_chars, true)
    if str:sub(i, i) ~= ":" then
      decode_error(str, i, "expected ':' after key")
    end
    i = next_char(str, i + 1, space_chars, true)
    -- Read value
    val, i = parse(str, i)
    -- Set
    res[key] = val
    -- Next token
    i = next_char(str, i, space_chars, true)
    local chr = str:sub(i, i)
    i = i + 1
    if chr == "}" then break end
    if chr ~= "," then decode_error(str, i, "expected '}' or ','") end
  end
  return res, i
end


local char_func_map = {
  [ '"' ] = parse_string,
  [ "0" ] = parse_number,
  [ "1" ] = parse_number,
  [ "2" ] = parse_number,
  [ "3" ] = parse_number,
  [ "4" ] = parse_number,
  [ "5" ] = parse_number,
  [ "6" ] = parse_number,
  [ "7" ] = parse_number,
  [ "8" ] = parse_number,
  [ "9" ] = parse_number,
  [ "-" ] = parse_number,
  [ "t" ] = parse_literal,
  [ "f" ] = parse_literal,
  [ "n" ] = parse_literal,
  [ "[" ] = parse_array,
  [ "{" ] = parse_object,
}


parse = function(str, idx)
  local chr = str:sub(idx, idx)
  local f = char_func_map[chr]
  if f then
    return f(str, idx)
  end
  decode_error(str, idx, "unexpected character '" .. chr .. "'")
end


function json.decode(str)
  if type(str) ~= "string" then
    error("expected argument of type string, got " .. type(str))
  end
  local res, idx = parse(str, next_char(str, 1, space_chars, true))
  idx = next_char(str, idx, space_chars, true)
  if idx <= #str then
    decode_error(str, idx, "trailing garbage")
  end
  return res
end

-- End JSON library.
local function is_commit_hash(hash)
  return #hash == 40 and not hash:find("[^a-z0-9]")
end



local common = {}
function common.merge(dst, src) for k, v in pairs(src) do dst[k] = v end return dst end
function common.map(l, p) local t = {} for i, v in ipairs(l) do table.insert(t, p(v)) end return t end
function common.each(l, p) for i, v in ipairs(l) do p(v) end end
function common.flat_map(l, p) local t = {} for i, v in ipairs(l) do local r = p(v) for k, w in ipairs(r) do table.insert(t, w) end end return t end
function common.concat(t1, t2) local t = {} for i, v in ipairs(t1) do table.insert(t, v) end for i, v in ipairs(t2) do table.insert(t, v) end return t end
function common.grep(l, p) local t = {} for i, v in ipairs(l) do if p(v) then table.insert(t, v) end end return t end
function common.first(l, p) for i, v in ipairs(l) do if p(v) then return v end end end
function common.slice(t, i, l) local n = {} for j = i, l ~= nil and (i - l) or #t do table.insert(n, t[j]) end return n end
function common.join(j, l) local s = "" for i, v in ipairs(l) do if i > 1 then s = s .. j .. v else s = v end end return s end
function common.sort(t, f) table.sort(t, f) return t end
function common.write(path, contents) local f, err = io.open(path, "wb") if not f then error("can't write to " .. path .. ": " .. err) end f:write(contents) f:flush() end
function common.read(path) local f, err = io.open(path, "rb") if not f then error("can't read from " .. path .. ": " .. err) end return f:read("*all") end
function common.uniq(l) local t = {} local k = {} for i,v in ipairs(l) do if not k[v] then table.insert(t, v) k[v] = true end end return t end
function common.split(splitter, str)
  local o = 1
  local res = {}
  while true do
      local s, e = str:find(splitter, o)
      table.insert(res, str:sub(o, s and (s - 1) or #str))
      if not s then break end
      o = e + 1
  end
  return table.unpack(res)
end

function common.dirname(path) local s = path:reverse():find("[/\\]") if not s then return path end return path:sub(1, #path - s) end
function common.basename(path) local s = path:reverse():find("[/\\]") if not s then return path end return path:sub(#path - s + 2) end
function common.path(exec) return common.first(common.map({ common.split(":", os.getenv("PATH")) }, function(e) return e .. PATHSEP .. exec end), function(e) return system.stat(e) end) end
function common.normalize_path(path) if not path or not path:find("^~") then return path end return os.getenv("HOME") .. path:sub(2) end
function common.rmrf(root)
  local info = root and root ~= "" and system.stat(root)
  if not info then return end
  if info.type == "file" or info.symlink then
    local status, err = os.remove(root)
    if not status then
      if not err:find("denied") then error("can't remove " .. root .. ": " .. err) end
      system.chmod(root, 448) -- chmod so that we can write, for windows.
      status, err = os.remove(root)
      if not status then error("can't remove " .. root .. ": " .. err) end
    end
  else
    for i,v in ipairs(system.ls(root)) do common.rmrf(root .. PATHSEP .. v) end
    system.rmdir(root)
  end
end
function common.mkdirp(path)
  local stat = system.stat(path)
  if stat and stat.type == "dir" then return true end
  if stat and stat.type == "file" then error("path " .. path .. " exists") end
  local segments = { common.split("[/\\]", path) }
  local target
  local extant_root = 0
  for i, dirname in ipairs(segments) do -- we need to do this, incase directories earlier in the chain exist, but we don't have permission to read.
    target = target and target .. PATHSEP .. dirname or dirname
    if system.stat(target) then extant_root = i end
  end
  target = nil
  for i, dirname in ipairs(segments) do
    target = target and target .. PATHSEP .. dirname or dirname
    if i >= extant_root and target ~= "" and not target:find("^[A-Z]:$") and not system.stat(target) then system.mkdir(target) end
  end
end
function common.copy(src, dst, hidden)
  local src_stat, dst_stat = system.stat(src), system.stat(dst)
  if not src_stat then error("can't find " .. src) end
  if not hidden and common.basename(src):find("^%.") then return end
  if dst_stat and dst_stat.type == "dir" then return common.copy(src, dst .. PATHSEP .. common.basename(src), hidden) end
  if src_stat.type == "dir" then
    common.mkdirp(dst)
    for i, file in ipairs(system.ls(src)) do common.copy(src .. PATHSEP .. file, dst .. PATHSEP .. file, hidden) end
  else
    local src_io, err1 = io.open(src, "rb")
    if err1 then error("can't open for reading " .. src .. ": " .. err1) end
    local dst_io, err2 = io.open(dst, "wb")
    if err2 then error("can't open for writing " .. dst .. ": " .. err2) end
    while true do
      local chunk = src_io:read(64*1024)
      if not chunk then break end
      dst_io:write(chunk)
    end
    dst_io:close()
  end
end
function common.rename(src, dst)
  local _, err = os.rename(src, dst)
  if err then error("can't rename file " .. src ..  " to " .. dst .. ": " .. err) end
end
function common.reset(path, ref, type)
  if is_commit_hash(ref) then
    system.reset(path, ref, type)
  else
    if not pcall(system.reset, path, "refs/tags/" .. ref, type) then system.reset(path, "refs/remotes/origin/" .. ref, type) end
  end
end
function common.chdir(dir, callback)
  local wd = system.pwd()
  system.chdir(dir)
  local status, err = pcall(callback)
  system.chdir(wd)
  if not status then error(err) end
end
function common.stat(path)
  local stat = system.stat(path)
  if not stat then error("can't find file or directory at " .. path) end
  return stat
end

local LATEST_MOD_VERSION = "3.0.0"
local EXECUTABLE_EXTENSION = PLATFORM == "windows" and ".exe" or ""
local HOME, USERDIR, CACHEDIR, JSON, VERBOSE, FILTRATION, MOD_VERSION, QUIET, FORCE, REINSTALL, AUTO_PULL_REMOTES, ARCH, ASSUME_YES, NO_INSTALL_OPTIONAL, TMPDIR, DATADIR, BINARY, POST, PROGRESS, SYMLINK, settings, repositories, lite_xls, system_bottle, progress_bar_label, write_progress_bar

local function engage_locks(func, err, warn)
  if not system.stat(USERDIR) then common.mkdirp(USERDIR) end
  local lockfile = USERDIR .. PATHSEP .. ".lock"
  if not system.stat(lockfile) then common.write(lockfile, "") end
  system.flock(lockfile, func, err, warn)
end

local Addon, Repository, LiteXL, Bottle = {}, {}, {}, {}

local actions, warnings = {}, {}
local function log_action(message)
  if JSON then table.insert(actions, message) end
  if not QUIET then io.stderr:write(message .. "\n") end
end
local function log_warning(message)
  if JSON then table.insert(warnings, message) end
  if not QUIET then io.stderr:write("warning: " .. message .. "\n") end
end
local function fatal_warning(message)
  if not FORCE then error(message .. "; use --force to override") else log_warning(message) end
end
local function log_progress_action(message)
  if write_progress_bar then
    progress_bar_label = message
  else
    log_action(message)
  end
end
local function prompt(message)
  if not ASSUME_YES or not JSON then
    io.stderr:write(message .. " [Y/n]: ")
    if ASSUME_YES then io.stderr:write("Y\n") end
  end
  if ASSUME_YES then return true end
  local response = io.stdin:read("*line")
  return not response:find("%S") or response:find("^%s*[yY]%s*$")
end

local status = 0
local function error_handler(err)
  local s, e = err and err:find(":%d+")
  local message = e and err:sub(e + 3) or err
  if JSON then
    if VERBOSE then
      io.stderr:write(json.encode({ error = err, actions = actions, warnings = warnings, traceback = debug.traceback(nil, 2) }) .. "\n")
    else
      io.stderr:write(json.encode({ error = message or err, actions = actions, warnings = warnings }) .. "\n")
    end
  else
    if err then io.stderr:write((not VERBOSE and message or err) .. "\n") end
    if VERBOSE then io.stderr:write(debug.traceback(nil, 2) .. "\n") end
  end
  status = -1
end
local function lock_warning()
  log_warning("waiting for lpm global lock to be released (only one instance of lpm can be run at once)")
end


function common.get(source, target, checksum, callback, depth)
  if not source then error("requires url") end
  if (depth or 0) > 10 then error("too many redirects") end
  local _, _, protocol, hostname, port, rest = source:find("^(https?)://([^:/?]+):?(%d*)(.*)$")
  log_progress_action("Downloading " .. source:sub(1, 100) .. "...")
  if not protocol then error("malfomed url " .. source) end
  if not port or port == "" then port = protocol == "https" and 443 or 80 end
  if not checksum then
    local res, headers = system.get(protocol, hostname, port, rest, target, callback)
    if headers.location then return common.get(headers.location, target, checksum, callback, (depth or 0) + 1) end
    return res
  end
  if not system.stat(CACHEDIR .. PATHSEP .. "files") then common.mkdirp(CACHEDIR .. PATHSEP .. "files") end
  local cache_path = CACHEDIR .. PATHSEP .. "files" .. PATHSEP .. (checksum ~= "SKIP" and checksum or system.hash(source))
  if not system.stat(cache_path) then
    local res, headers = system.get(protocol, hostname, port, rest, cache_path, callback)
    if headers.location then return common.get(headers.location, target, checksum, callback, (depth or 0) + 1) end
    if checksum ~= "SKIP" and system.hash(cache_path, "file") ~= checksum then fatal_warning("checksum doesn't match for " .. source) end
  end
  common.copy(cache_path, target)
end



local function compare_version(a, b) -- compares semver
  if not a or not b then return false end
  local _, _, majora, minora, revisiona = tostring(a):find("(%d+)%.?(%d*)%.?(%d*)")
  local _, _, majorb, minorb, revisionb = tostring(b):find("(%d+)%.?(%d*)%.?(%d*)")
  if majora == nil then error("can't parse version " .. a) end
  if majorb == nil then error("can't parse version " .. b) end
  majora, minora, revisiona = tonumber(majora) or 0, tonumber(minora) or 0, tonumber(revisiona) or 0
  majorb, minorb, revisionb = tonumber(majorb) or 0, tonumber(minorb) or 0, tonumber(revisionb) or 0
  if majora ~= majorb then return majora < majorb and -3 or 3 end
  if minora ~= minorb then return minora < minorb and -2 or 2 end
  if revisiona ~= revisionb then return revisiona < revisionb and -1 or 1 end
  return 0
end

local function match_version(version, pattern)
  if not pattern then return true end
  if pattern:find("^>=") then return compare_version(version, pattern:sub(3)) >= 0 end
  if pattern:find("^<=") then return compare_version(version, pattern:sub(3)) <= 0 end
  if pattern:find("^<") then return compare_version(version, pattern:sub(2)) == -1 end
  if pattern:find("^>") then return compare_version(version, pattern:sub(2)) == 1 end
  if pattern:find("^=") then return compare_version(version, pattern:sub(2)) == 0 end
  return version == pattern
end

local function compatible_modversion(lite_xl_modversion, addon_modversion)
  local result = compare_version(lite_xl_modversion, addon_modversion)
  return result >= 0 and result < 3
end


-- There can exist many different versions of an addon. All statuses are relative to a particular lite bottle.
-- available: Addon is available in a repository, and can be installed. There is no comparable version on the system.
-- upgradable: Addon is installed, but does not match the highest version in any repository.
-- orphan: Addon is installed, but there is no corresponding addon in any repository.
-- installed: Addon is installed, and matches the highest version in any repository, or highest version is incompatible.
-- core: Addon is a part of the lite data directory, and doesn't have corresponding addons in any repository.
-- bundled: Addon is part of the lite data directory, but has corresponding addons in any repository.
-- incompatible: Addon is not installed and conflicts with existing installed addons.
function Addon.__index(self, idx) return rawget(self, idx) or Addon[idx] end
function Addon.new(repository, metadata)
  if type(metadata.id) ~= 'string' or metadata.id:find("[^a-z0-9%-_]") then error("addon requires a valid id " .. (metadata.id and "(" .. metadata.id .. " is invalid)" or "")) end
  local type = metadata.type or "plugin"
  if metadata.path then metadata.path = metadata.path:gsub("/", PATHSEP) end
  local self = setmetatable(common.merge({
    repository = repository,
    tags = {},
    type = type,
    path = nil,
    remote = nil,
    version = "1.0",
    location = "user",
    dependencies = {},
    conflicts = {},
    name = metadata.id
  }, metadata), Addon)
  self.type = type
  -- Directory.
  local plural_type = type == "library" and "libraries" or (type .. "s")
  if not self.path and repository and repository.local_path and system.stat(repository.local_path .. PATHSEP .. plural_type  .. PATHSEP .. self.id .. ".lua") then self.path = plural_type .. PATHSEP .. self.id .. ".lua" end
  if not self.path and repository and repository.local_path and system.stat(repository.local_path .. PATHSEP .. plural_type .. PATHSEP .. self.id) then self.path = plural_type .. PATHSEP .. self.id end
  self.organization = metadata.organization or (((self.files and #self.files > 0) or (not self.path and not self.url) or (self.path and not self.path:find("%.lua$"))) and "complex" or "singleton")
  if self.dependencies and #self.dependencies > 0 then
    local t = {}
    for i,v in ipairs(self.dependencies) do t[v] = {} end
    self.dependencies = t
  end
  if not self.local_path and repository then
    if self.remote then
      local local_path = (Repository.url(self.remote).local_path .. (self.path and (PATHSEP .. self.path:gsub("^/", "")) or ""))
      self.local_path = system.stat(local_path) and (Repository.url(self.remote).local_path .. (self.path and (PATHSEP .. self.path:gsub("^/", "")) or "")) or nil
    else
      self.local_path = (repository.local_path .. (self.path and (PATHSEP .. self.path:gsub("^/", "")) or "")) or nil
    end
  end
  return self
end

function Addon:is_stub() return self.remote end

function Addon:unstub()
  if not self:is_stub() or self.inaccessible then return end
  local repo
  local status, err = pcall(function()
    repo = Repository.url(self.remote):fetch()
    local manifest = repo:parse_manifest(self.id)
    local remote_entry = common.grep(manifest['addons'] or manifest['plugins'], function(e) return e.id == self.id end)[1]
    if not remote_entry then error("can't find " .. self.type .. " on " .. self.remote) end
    local addon = Addon.new(repo, remote_entry)
    -- merge in attribtues that are probably more accurate than the stub
    if addon.version ~= self.version then log_warning(self.id .. " stub on " .. self.repository:url() .. " has differing version from remote (" .. self.version .. " vs " .. addon.version .. "); may lead to install being inconsistent") end
    -- if addon.mod_version ~= self.mod_version then log_warning(self.id .. " stub on " .. self.repository:url() .. " has differing mod_version from remote (" .. self.mod_version .. " vs " .. addon.mod_version .. ")") end
    for k,v in pairs(addon) do self[k] = v end
  end)
  if not status then self.inaccessible = err end
  return repo
end

-- Determines whether two addons located at different paths are actually different based on their contents.
-- If path1 is a directory, will still return true if it's a subset of path2 (accounting for binary downloads).
function Addon.is_path_different(path1, path2)
  local stat1, stat2 = system.stat(path1), system.stat(path2)
  if not stat1 or not stat2 or stat1.type ~= stat2.type or stat1.size ~= stat2.size then return true end
  if stat1.type == "dir" then
    for i, file in ipairs(system.ls(path1)) do
      if not common.basename(file):find("^%.") and Addon.is_path_different(path1 .. PATHSEP .. file, path2 .. PATHSEP.. file) then return true end
    end
    return false
  end
  return system.hash(path1, "file") ~= system.hash(path2, "file")
end

function Addon.is_addon_different(downloaded_path, installed_path)
  local is_downloaded_single = downloaded_path:find("%.lua$")
  local is_installed_single = installed_path:find("%.lua$")
  local target = is_downloaded_single and not is_installed_single and installed_path .. PATHSEP .. "init.lua" or installed_path
  return Addon.is_path_different(downloaded_path, target)
end

function Addon:get_install_path(bottle)
  local folder = self.type == "color" and "colors" or (self.type == "library" and "libraries" or "plugins")
  local path = (((self:is_core(bottle) or self:is_bundled()) and bottle.lite_xl.datadir_path) or (bottle.local_path and (bottle.local_path .. PATHSEP .. "user") or USERDIR)) .. PATHSEP .. folder .. PATHSEP .. self.id
  if self.organization == "singleton" then path = path .. ".lua" end
  return path
end

function Addon:is_orphan(bottle) return not self.repository end
function Addon:is_core(bottle) return self.location == "core" end
function Addon:is_bundled(bottle) return self.location == "bundled" end
function Addon:is_installed(bottle)
  if self:is_core(bottle) or self:is_bundled(bottle) or not self.repository then return true end
  local install_path = self:get_install_path(bottle)
  if not system.stat(install_path) then return false end
  local installed_addons = common.grep({ bottle:get_addon(self.id, nil, {  }) }, function(addon) return not addon.repository end)
  if #installed_addons > 0 then return false end
  return self.local_path and not Addon.is_addon_different(self.local_path, install_path)
end
function Addon:is_upgradable(bottle)
  if self:is_installed(bottle) then
    local addons = { bottle:get_addon(self.id) }
    for i, v in ipairs(addons) do
      if self.version and v.version and v ~= self and compare_version(self.version, v.version) <= 1 then
        return true
      end
    end
  end
  return false
end
function Addon:is_incompatible(addon)
  return (self.dependencies[addon.id] and not match_version(addon.version, self.dependencies[addon.id] and self.dependencies[addon.id].version)) or
    (self.conflicts[addon.id] and match_version(addon.version, self.conflicts[addon.id] and self.conflicts[addon.id].version))
end

function Addon:get_path(bottle)
  return self:is_installed(bottle) and self:get_install_path(bottle) or self.local_path
end

function Addon:get_compatibilities(bottle)
  local compatible_addons, incompatible_addons = {}, {}
  local installed_addons = bottle:installed_addons()
  for addon, v in pairs(self.dependencies) do
    local potential_addons = { bottle:get_addon(addon, v.version, { mod_version = bottle.lite_xl.mod_version }) }
    for i, potential_addon in ipairs(potential_addons) do
      local incomaptibilities = common.grep(installed_addons, function(p) return p:is_incompatible(potential_addon) end)
      if #incomaptibilities == 0 then
        if not compatible_addons[addon] or
          potential_addon:is_installed(bottle) or
          (compare_version(compatible_addons[addon].version, potential_addon.version) and not compatible_addons[addon]:is_installed(bottle))
        then
          compatible_addons[addon] = potential_addon
        end
      else
        incompatible_addons[addon] = incompatibilities
      end
    end
  end
  return compatible_addons, incompatible_addons
end



function Addon:install(bottle, installing)
  if self:is_installed(bottle) and not REINSTALL then error("addon " .. self.id .. " is already installed") return end
  if self:is_stub() then self:unstub() end
  if self.inaccessible then error("addon " .. self.id .. " is inacessible: " .. self.inaccessible) end
  local install_path = self:get_install_path(bottle)
  local temporary_install_path = TMPDIR .. PATHSEP .. install_path:sub(#USERDIR + 2)
  local status, err = pcall(function()
    installing = installing or {}
    installing[self.id] = true
    local compatible, incompatible = self:get_compatibilities(bottle)
    for addon, version in pairs(self.dependencies) do
      if incompatible[addon] then error("can't install " .. self.id .. ": incompatible with " .. incompatible[addon][1].id .. ":" .. incompatible[addon][1].version) end
    end
    for addon, v in pairs(self.dependencies) do
      if not compatible[addon] then
        if not v.optional then
          error("can't find dependency " .. addon .. (v.version and (":" .. v.version) or ""))
        else
          log_warning("can't find optional dependency " .. addon .. (v.version and (":" .. v.version) or ""))
        end
      end
    end
    for addon, v in pairs(self.dependencies) do
      if compatible[addon] and not compatible[addon]:is_core(bottle) and not compatible[addon]:is_installed(bottle) then
        if installing[addon] then
          error("circular dependency detected in " .. self.id .. ": requires " .. addon .. " but, " .. addon .. " requires " .. self.id)
        end
        if not v.optional or (not NO_INSTALL_OPTIONAL and prompt(addon .. " is an optional dependency of " .. self.id .. ". Should we install it?")) then
          compatible[addon]:install(bottle, installing)
        end
      end
    end
    common.mkdirp(common.dirname(temporary_install_path))
    if self:is_upgradable(bottle) then
      log_action("Upgrading " .. self.organization .. " " .. self.type .. " located at " .. self.local_path .. " to " .. install_path)
      common.rmrf(install_path)
    else
      log_action("Installing " .. self.organization .. " " .. self.type .. " located at " .. (self.local_path or self.remote) .. " to " .. install_path)
    end

    if self.organization == "complex" and self.path and common.stat(self.local_path).type ~= "dir" then common.mkdirp(install_path) end
    if self.url then -- remote simple plugin
      local path = temporary_install_path .. (self.organization == 'complex' and self.path and system.stat(self.local_path).type ~= "dir" and (PATHSEP .. "init.lua") or "")
      common.get(self.url, path, self.checksum, write_progress_bar)
      log_action("Downloaded file " .. self.url .. " to " .. path)
      if system.hash(path, "file") ~= self.checksum then fatal_warning("checksum doesn't match for " .. path) end
    elseif self.path then -- local plugin that has a local path
      local path = install_path .. (self.organization == 'complex' and self.path and common.stat(self.local_path).type ~= "dir" and (PATHSEP .. "init.lua") or "")
      local temporary_path = temporary_install_path .. (self.organization == 'complex' and self.path and system.stat(self.local_path).type ~= "dir" and (PATHSEP .. "init.lua") or "")
      if self.organization == 'complex' and self.path and common.stat(self.local_path).type ~= "dir" then common.mkdirp(temporary_install_path) end
      if SYMLINK then
        log_action("Symlinking " .. self.local_path .. " to " .. path)
        system.symlink(self.local_path, temporary_path)
      else
        log_action("Copying " .. self.local_path .. " to " .. path)
        common.copy(self.local_path, temporary_path)
      end
    elseif self.organization == 'complex' then -- complex plugin without local path
      local path = install_path .. (self.organization == 'complex' and self.path and common.stat(self.local_path).type ~= "dir" and (PATHSEP .. "init.lua") or "")
      if SYMLINK then
        log_action("Symlinking " .. self.local_path .. " to " .. path)
        system.symlink(self.local_path, temporary_install_path)
      else
        log_action("Copying " .. self.local_path .. " to " .. path)
        common.copy(self.local_path, temporary_install_path)
      end
    end


    local has_arched_files = #common.grep(self.files or {}, function(e) return e.arch end) > 0
    for _, arch in ipairs(ARCH) do
      local has_one_file = false
      for _, file in ipairs(self.files or {}) do
        local file_arch = file.arch and type(file.arch) == "string" and { file.arch } or file.arch
        if not file.arch or #common.grep(file_arch, function(e) return e == arch end) > 0 then
          if file.arch then has_one_file = true end
          if not file.optional or (not NO_INSTALL_OPTIONAL and prompt(common.basename(file.url) .. " is an optional dependency of " .. self.id .. ". Should we install it?")) then
            if not file.checksum then error("requires a checksum") end
            local target_path = install_path .. PATHSEP .. (file.path or common.basename(file.url))
            local temporary_path = temporary_install_path .. PATHSEP .. (file.path or common.basename(file.url))

            local local_path = self.repository.repo_path .. PATHSEP .. (file.path or common.basename(file.url))
            local stripped_local_path = local_path:find("%.[^%.]+%-[^%.]+%.[^%.]*$") and local_path:gsub("%.[^%.]+%-[^%.]+", "") or local_path

            if SYMLINK and self.repository:is_local() and system.stat(local_path) then
              log_action("Symlinking " .. local_path .. " to " .. target_path)
              system.symlink(local_path, temporary_path)
            elseif SYMLINK and self.repository:is_local() and system.stat(stripped_local_path) then
              log_action("Symlinking " .. stripped_local_path .. " to " .. target_path)
              system.symlink(stripped_local_path, temporary_path)
            else
              common.get(file.url, temporary_path, file.checksum, write_progress_bar)
              local basename = common.basename(target_path)
              if basename:find("%.zip$") or basename:find("%.tar%.gz$") then
                log_action("Extracting file " .. basename .. " in " .. install_path)
                system.extract(temporary_path, temporary_install_path)
                os.remove(temporary_path)
              else
                if file.arch and file.arch ~= "*" then system.chmod(temporary_path, 448) end -- chmod any ARCH tagged file to rwx-------
              end
            end
          end
        end
      end

      if has_arched_files and not has_one_file and (not self.arch or (self.arch ~= "*" and #common.grep(self.arch, function(a) return a == arch end) == 0)) then
        error("Addon " .. self.id .. " does not support arch " .. arch)
      end
    end
  end)
  bottle:invalidate_cache()
  if not status then
    common.rmrf(temporary_install_path)
    error(err)
  else
    if POST and self.post then
      common.chdir(temporary_install_path, function()
        for i, arch in ipairs(ARCH) do
          if type(self.post) == "table" and not self.post[ARCH] then error("can't find post command for arch " .. ARCH) end
          local code = os.system(type(self.post) == "table" and self.post[ARCH] or self.post) ~= 0
          if code ~= 0 then error("post step failed with error code " .. code) end
        end
      end)
    end
    common.rmrf(install_path)
    common.mkdirp(common.dirname(install_path))
    common.rename(temporary_install_path, install_path)
  end
end

function Addon:depends_on(addon)
  if self.dependencies[addon.id] and self.dependencies[addon.id].optional ~= true then return true end
  for i,v in ipairs(addon.provides or {}) do if self.dependencies[v] and self.dependencies[v].optional ~= true then return true end end
  return false
end

function Addon:uninstall(bottle)
  local install_path = self:get_install_path(bottle)
  if self:is_core(bottle) then error("can't uninstall " .. self.id .. "; is a core addon") end
  log_action("Uninstalling " .. self.type .. " located at " .. install_path)
  local incompatible_addons = common.grep(bottle:installed_addons(), function(p) return p:depends_on(self) end)
  if #incompatible_addons == 0 or prompt(self.id .. " is depended upon by " .. common.join(", ", common.map(incompatible_addons, function(p) return p.id end)) .. ". Remove as well?") then
    for i,addon in ipairs(incompatible_addons) do
      if not addon:uninstall(bottle) then return false end
    end
    common.rmrf(install_path)
    return true
  end
  return false
end


function Repository.__index(self, idx) return rawget(self, idx) or Repository[idx] end
function Repository.new(hash)
  if hash.remote then
    if not hash.remote:find("^%w+:") and system.stat(hash.remote .. "/.git") then hash.remote = "file://" .. system.stat(hash.remote).abs_path end
    if not hash.remote:find("^https?:") and not hash.remote:find("^file:") then error("only repositories with http and file transports are supported (" .. hash.remote .. ")") end
  else
    if not hash.repo_path then error("requires a remote, or a repo_path") end
  end
  local self = setmetatable({
    commit = hash.commit,
    remote = hash.remote,
    branch = hash.branch,
    live = nil,
    addons = nil,
    repo_path = hash.repo_path or (CACHEDIR .. PATHSEP .. "repos" .. PATHSEP .. system.hash(hash.remote)),
    lite_xls = {},
    last_retrieval = nil
  }, Repository)
  if not self:is_local() then
    if system.stat(self.repo_path) and not self.commit and not self.branch then
      -- In the case where we don't have a branch, and don't have a commit, check for the presence of `master` and `main`.
      if system.stat(self.repo_path .. PATHSEP .. "master") then
        self.branch = "master"
      elseif system.stat(self.repo_path .. PATHSEP .. "main") then
        self.branch = "main"
      else
        error("can't find branch for " .. self.remote .. " in " .. self.repo_path)
      end
    end
    if self.commit or self.branch then
      self.local_path = self.repo_path .. PATHSEP .. (self.commit or self.branch)
    end
  else
    self.local_path = self.repo_path
  end
  return self
end

function Repository:is_local()
  return self.remote == nil
end

function Repository.url(url)
  if type(url) == "table" then return (url.remote and (url.remote .. ":" .. (url.branch or url.commit)) or url.repo_path) end
  if not url:find("^%a+:") then return Repository.new({ repo_path = url:gsub("[/\\]$", "") }) end
  local e = url:reverse():find(":")
  local s = e and (#url - e + 1)
  local remote, branch_or_commit = url:sub(1, s and (s-1) or #url), s and url:sub(s+1)
  if remote == "https" or remote == "file" then remote, branch_or_commit = url, nil end
  if branch_or_commit and is_commit_hash(branch_or_commit) then
    return Repository.new({ remote = remote, commit = branch_or_commit })
  end
  return Repository.new({ remote = remote, branch = branch_or_commit })
end

function Repository:parse_manifest(repo_id)
  if self.manifest then return self.manifest, self.remotes end
  if system.stat(self.local_path)  then
    self.manifest_path = self.local_path .. PATHSEP .. "manifest.json"
    if not system.stat(self.manifest_path) then
      log_warning("Can't find manifest.json for " .. self:url() .. "; automatically generating manifest.")
      self:generate_manifest(repo_id)
    end
    local status, err = pcall(function()
      self.manifest = json.decode(common.read(self.manifest_path))
      self.addons = {}
      self.remotes = {}
      for i, metadata in ipairs(self.manifest["addons"] or self.manifest["plugins"] or {}) do
        table.insert(self.addons, Addon.new(self, metadata))
      end
      for i, metadata in ipairs(self.manifest["lite-xls"] or {}) do
        table.insert(self.lite_xls, LiteXL.new(self, metadata))
      end
      self.remotes = common.map(self.manifest["remotes"] or {}, function(r) return Repository.url(r) end)
    end)
    if not status then error("error parsing manifest for " .. self:url() .. ": " .. err) end
  end
  return self.manifest, self.remotes
end


-- in the cases where we don't have a manifest, assume generalized structure, take addons folder, trawl through it, build manifest that way
-- assuming each .lua file under the `addons` folder is a addon. also parse the README, if present, and see if any of the addons
-- Ignore any requries that are in CORE_PLUGINS.
local CORE_PLUGINS = {
  autocomplete = true, autoreload = true, contextmenu = true, detectindent = true, drawwhitespace = true, language_c = true, language_cpp = true, language_css = true, language_dart = true,
  language_html = true, language_js = true, language_lua = true, language_md = true, language_python = true, language_xml = true, lineguide = true, linewrapping = true, macro = true,
  projectsearch = true, quote = true, reflow = true, scale = true, tabularize = true, toolbarview = true, treeview = true, trimwhitespace = true, workspace = true
}
function Repository:generate_manifest(repo_id)
  if not self.commit and not self.branch then error("requires an instantiation") end
  local path = self.local_path
  local addons, addon_map = {}, {}
  for _, folder in ipairs({ "plugins", "colors", "libraries" }) do
    if system.stat(path .. PATHSEP .. "README.md") then -- If there's a README, parse it for a table like in our primary repository.
      for line in io.lines(path .. PATHSEP .. "README.md") do
        local _, _, name, path, description = line:find("^%s*%|%s*%[`([%w_]+)%??.-`%]%((.-)%).-%|%s*(.-)%s*%|%s*$")
        if name then
          local id = name:lower():gsub("[^a-z0-9%-_]", "")
          addon_map[id] = { id = id, description = description, name = name }
          if path:find("^http") then
            if path:find("%.lua") then
              addon_map[id].url = path
              local file = common.get(path, nil, nil, write_progress_bar)
              addon_map[id].checksum = system.hash(file)
            else
              path = path:gsub("\\", "")
              addon_map[id].remote = path
              pcall(function()
                local repo = Repository.url(path):add()
                addon_map[id].remote = path .. ":" .. system.revparse(repo.local_path)
              end)
            end
          else
            addon_map[id].path = path:gsub("%?.*$", "")
          end
        end
      end
    end
    if folder == "plugins" or system.stat(path .. PATHSEP .. folder) then
      local addon_dir = system.stat(path .. PATHSEP .. folder) and PATHSEP .. folder or ""
      local files = folder == "plugins" and system.stat(path .. PATHSEP .. "init.lua") and { "init.lua" } or system.ls(path .. addon_dir)
      for i, file in ipairs(files) do
        if file:find("%.lua$") then
          local filename = common.basename(file):gsub("%.lua$", "")
          local name = filename
          if repo_id and name == "init" then name = repo_id end
          if name ~= "init" then
            local type = folder == "colors" and "color" or (folder == "libraries" and "library" or "plugin")
            local addon = { description = nil, id = name:lower():gsub("[^a-z0-9%-_]", ""), name = name, mod_version = LATEST_MOD_VERSION, version = "0.1", path = (filename ~= "init" and (addon_dir .. PATHSEP .. file) or nil), type = type }
            for line in io.lines(path .. addon_dir .. PATHSEP .. file) do
              local _, _, mod_version = line:find("%-%-.*mod%-version:%s*(%w+)")
              if mod_version then addon.mod_version = mod_version end
              local _, _, required_addon = line:find("require [\"']plugins.([%w_]+)")
              if required_addon and not CORE_PLUGINS[required_addon] then if required_addon ~= addon.id then if not addon.dependencies then addon.dependencies = {} end addon.dependencies[required_addon] = ">=0.1" end end
            end
            if addon_map[addon.id] then
              addon = common.merge(addon, addon_map[addon.id])
              addon_map[addon.id].addon = addon
            end
            table.insert(addons, addon)
          end
        end
      end
    end
  end
  for k, v in pairs(addon_map) do
    if not v.addon then
      table.insert(addons, common.merge({ mod_version = LATEST_MOD_VERSION, version = "0.1" }, v))
    end
  end
  table.sort(addons, function(a,b) return a.id:lower() < b.id:lower() end)
  common.write(path .. PATHSEP .. "manifest.json", json.encode({ addons = addons }))
end

-- useds to fetch things from a generic place
function Repository:fetch()
  if self:is_local() then return self end
  local path
  local status, err = pcall(function()
    if not self.branch and not self.commit then
      path = self.repo_path .. PATHSEP .. "master"
      common.mkdirp(path)
      log_progress_action("Fetching " .. self.remote .. ":master/main...")
      system.init(path, self.remote)
      system.fetch(path, write_progress_bar)
      if not pcall(system.reset, path, "refs/remotes/origin/master", "hard") then
        if pcall(system.reset, path, "refs/remotes/origin/main", "hard") then
          common.rename(path, self.repo_path .. PATHSEP .. "main")
          path = self.repo_path .. PATHSEP .. "main"
          self.branch = "main"
        else
          error("can't find master or main.")
        end
      else
        self.branch = "master"
      end
      self.local_path = path
    else
      path = self.local_path
      local exists = system.stat(path)
      if not exists then
        common.mkdirp(path)
        system.init(path, self.remote)
      end
      if not exists or self.branch then
        log_progress_action("Fetching " .. self.remote .. ":" .. (self.commit or self.branch) .. "...")
        system.fetch(path, write_progress_bar)
        common.reset(path, self.commit or self.branch, "hard")
      end
      self.manifest = nil
    end
  end)
  if not status then
    if path then
      common.rmrf(path)
      local dir = common.dirname(path)
      if system.stat(dir) and #system.ls(dir) == 0 then common.rmrf(dir) end
    end
    error(err)
  end
  return self
end

function Repository:add(pull_remotes)
  -- If neither specified then pull onto `master`, and check the main branch name, and move if necessary.
  local manifest, remotes = self:fetch():parse_manifest()
  if pull_remotes then -- any remotes we don't have in our listing, call add, and add into the list
    for i, remote in ipairs(remotes) do
      if not common.first(repositories, function(repo) return repo.remote == remote.remote and repo.branch == remote.branch and repo.commit == remote.commit end) then
        remote:add(pull_remotes == "recursive" and "recursive" or false)
        table.insert(repositories, remote)
      end
    end
  end
  return self
end


function Repository:update(pull_remotes)
  local manifest, remotes = self:parse_manifest()
  if self.branch then
    system.fetch(self.local_path)
    common.reset(self.local_path, self.branch, "hard")
    log_action("Updated " .. self:url())
    self.manifest = nil
    manifest, remotes = self:parse_manifest()
  end
  if pull_remotes then -- any remotes we don't have in our listing, call add, and add into the list
    for i, remote in ipairs(remotes) do
      if common.first(repositories, function(repo) return repo.remote == remote.remote and repo.branch == remote.branch and repo.commit == remote.comit end) then
        remote:add(pull_remotes == "recursive" and "recursive" or false)
        table.insert(repositories, remote)
      end
    end
  end
end


function Repository:remove()
  if not self:is_local() then
    common.rmrf(self.local_path)
    if #system.ls(self.repo_path) == 0 then common.rmrf(self.repo_path) end
  end
end


function LiteXL.__index(t, k) return LiteXL[k] end
function LiteXL.new(repository, metadata)
  if not metadata.version then error("lite-xl entry requires a version") end
  local self = setmetatable(common.merge({
    repository = repository,
    tags = {},
    files = {}
  }, metadata), LiteXL)
  self.hash = system.hash((repository and repository:url() or "") .. "-" .. metadata.version .. common.join("", common.map(self.files, function(f) return f.checksum end)))
  self.local_path = self:is_local() and self.path or (CACHEDIR .. PATHSEP .. "lite_xls" .. PATHSEP .. self.version .. PATHSEP .. self.hash)
  self.binary_path = self.binary_path or { }
  self.datadir_path = self.datadir_path or (self.local_path .. PATHSEP .. "data")
  return self
end

function LiteXL:get_binary_path(arch)
  if self.binary_path and self.binary_path[arch or _G.ARCH] then return self.binary_path[arch or _G.ARCH] end
  return self.local_path .. PATHSEP .. "lite-xl." .. (arch or _G.ARCH)
end

function LiteXL:is_system() return system_bottle and system_bottle.lite_xl == self end
function LiteXL:is_local() return not self.repository and self.path end
function LiteXL:is_compatible(addon) return not addon.mod_version or compatible_modversion(self.mod_version, addon.mod_version) end
function LiteXL:is_installed() return system.stat(self.local_path) ~= nil end

function LiteXL:install()
  if self:is_installed() then log_warning("lite-xl " .. self.version .. " already installed") return end
  common.mkdirp(self.local_path)
  if system_bottle.lite_xl == self then -- system lite-xl. We have to copy it because we can't really set the user directory.
    local executable, datadir = common.path("lite-xl" .. EXECUTABLE_EXTENSION)
    if not executable then error("can't find system lite-xl executable") end
    local stat = system.stat(executable)
    executable = stat.symlink and stat.symlink or executable
    datadir = common.dirname(executable) .. PATHSEP .. "data"
    if not system.stat(datadir) then error("can't find system lite-xl data dir") end
    common.copy(executable, self.local_path .. PATHSEP .. "lite-xl")
    system.chmod(self.local_path .. PATHSEP .. "lite-xl", 448) -- chmod to rwx-------
    common.copy(datadir, self.local_path .. PATHSEP .. "data")
  elseif self.path and not self.repository then -- local repository
    system.symlink(self:get_binary_path(), self.local_path .. PATHSEP .. "lite_xl")
  else
    if self.remote then
      system.init(self.local_path, self.remote)
      common.reset(self.local_path, self.commit or self.branch)
    end
    for i,file in ipairs(self.files or {}) do
      if file.arch and common.grep(ARCH, function(e) return e == file.arch end)[1] then
        if not file.checksum then error("requires a checksum") end
        local basename = common.basename(file.url)
        local archive = basename:find("%.zip$") or basename:find("%.tar%.gz$")
        local path = self.local_path .. PATHSEP .. (archive and basename or "lite-xl")
        log_action("Downloading file " .. file.url .. "...")
        common.get(file.url, path, file.checksum, write_progress_bar)
        log_action("Downloaded file " .. file.url .. " to " .. path)
        if file.checksum ~= "SKIP" and system.hash(path, "file") ~= file.checksum then fatal_warning("checksum doesn't match for " .. path) end
        if archive then
          log_action("Extracting file " .. basename .. " in " .. self.local_path)
          system.extract(path, self.local_path)
        end
      end
    end
  end
  if not system.stat(self.local_path .. PATHSEP .. "lite-xl") then error("can't find executable for lite-xl " .. self.version) end
end

function LiteXL:uninstall()
  if not system.stat(self.local_path) then error("lite-xl " .. self.version .. " not installed") end
  common.rmrf(self.local_path)
end


function Bottle.__index(t, k) return Bottle[k] end
function Bottle.new(lite_xl, addons, is_system)
  local self = setmetatable({
    lite_xl = lite_xl,
    addons = addons,
    is_system = is_system
  }, Bottle)
  if not is_system then
    table.sort(self.addons, function(a, b) return (a.id .. ":" .. a.version) < (b.id .. ":" .. b.version) end)
    self.hash = system.hash(lite_xl.version .. " " .. common.join(" ", common.map(self.addons, function(p) return p.id .. ":" .. p.version end)))
    self.local_path = CACHEDIR .. PATHSEP .. "bottles" .. PATHSEP .. self.hash
  end
  return self
end

function Bottle:is_constructed() return self.is_system or system.stat(self.local_path) end

function Bottle:construct()
  if self.is_system then error("system bottle cannot be constructed") end
  if self:is_constructed() and not REINSTALL then error("bottle " .. self.hash .. " already constructed") end
  if not self.lite_xl:is_installed() then self.lite_xl:install() end
  common.mkdirp(self.local_path .. PATHSEP .. "user")

  -- Always copy the executbale, because of the way that lite determines the user folder (for now).
  common.copy(self.lite_xl:get_binary_path(), self.local_path .. PATHSEP .. "lite-xl" .. EXECUTABLE_EXTENSION)
  system.chmod(self.local_path .. PATHSEP .. "lite-xl" .. EXECUTABLE_EXTENSION, 448) -- chmod to rwx-------\
  if SYMLINK then
    system.symlink(self.lite_xl.datadir_path, self.local_path .. PATHSEP .. "data")
  else
    common.copy(self.lite_xl.datadir_path, self.local_path .. PATHSEP .. "data")
  end
  for i,addon in ipairs(self.addons) do addon:install(self) end
end

function Bottle:destruct()
  if self.is_system then error("system bottle cannot be destructed") end
  if not self:is_constructed() then error("lite-xl " .. self.version .. " not constructed") end
  common.rmrf(self.local_path)
end

function Bottle:run(args)
  args = args or {}
  if self.is_system then error("system bottle cannot be run") end
  os.execute(self.local_path .. PATHSEP .. "lite-xl" .. (#args > 0 and " " or "") .. table.concat(args, " "))
end

local function get_repository_addons()
  local t, hash = { }, { }
  for i,p in ipairs(common.flat_map(repositories, function(r) return r.addons end)) do
    local id = p.id .. ":" .. p.version
    if not hash[id] then
      table.insert(t, p)
      hash[id] = p
      if not hash[p.id] then hash[p.id] = {} end
      table.insert(hash[p.id], p)
    elseif hash[id].remote and not p.remote then
      for k,v in ipairs(t) do
        if v == hash[id] then
          t[k] = p
          break
        end
      end
      for k,v in ipairs(hash[p.id]) do
        if v == hash[id] then
          hash[p.id][k] = p
          hash[id] = p
          break
        end
      end
    end
  end
  return t, hash
end

function Bottle:invalidate_cache()
  self.all_addons_cache = nil
end

function Bottle:all_addons()
  if self.all_addons_cache then return self.all_addons_cache end
  local t, hash = get_repository_addons()
  for _, addon_type in ipairs({ "plugins", "libraries" }) do
    local addon_paths = {
      (self.local_path and (self.local_path .. PATHSEP .. "user") or USERDIR) .. PATHSEP .. addon_type,
      self.lite_xl.datadir_path .. PATHSEP .. addon_type
    }
    for i, addon_path in ipairs(common.grep(addon_paths, function(e) return system.stat(e) end)) do
      for j, v in ipairs(system.ls(addon_path)) do
        local id = v:gsub("%.lua$", ""):lower():gsub("[^a-z0-9%-_]", "")
        local path = addon_path .. PATHSEP .. v
        -- in the case where we have an existing plugin that targets a stub, then fetch that repository
        local fetchable = hash[id] and common.grep(hash[id], function(e) return e:is_stub() end)[1]
        if fetchable then fetchable:unstub() end
        local matching = hash[id] and common.grep(hash[id], function(e)
          return e.local_path and not Addon.is_addon_different(e.local_path, path)
        end)[1]
        if i == 2 or not hash[id] or not matching then
          table.insert(t, Addon.new(nil, {
            id = id,
            type = (addon_type == "plugins" and "plugin") or "library",
            location = (i == 2 and (hash[id] and "bundled" or "core")) or "user",
            organization = (v:find("%.lua$") and "singleton" or "complex"),
            local_path = path,
            mod_version = self.lite_xl.mod_version,
            path = addon_type .. PATHSEP .. v,
            description = (hash[id] and hash[id][1].description or nil)
          }))
        end
      end
    end
  end
  self.all_addons_cache = t
  return t
end

function Bottle:installed_addons()
  return common.grep(self:all_addons(), function(p) return p:is_installed(self) end)
end

local function filter_match(field, filter)
  if not field and not filter then return true end
  if not field and filter then return false end
  local filters = type(filter) == "table" and filter or { filter }
  for i,v in ipairs(filters) do
    local inverted = filter:find("^!")
    local actual_filter = inverted and filter:sub(2) or filter
    local matches = field:find("^" .. actual_filter .. "$")
    if not matches and not inverted then return false end
    if matches and inverted then return false end
  end
  return true
end

local function addon_matches_filter(addon, filters)
  return filter_match(addon.author, filters["author"]) and
    filter_match(addon.tags, filters["tag"]) and
    filter_match(addon.status, filters["status"]) and
    filter_match(addon.stub, filters["stub"]) and
    filter_match(addon.dependencies, filters["dependency"]) and
    filter_match(addon.type, filters["type"]) and
    filter_match(addon.name or addon.id, filters["name"])
end

function Bottle:get_addon(id, version, filter)
  local candidates = {}
  local wildcard = id:find("%*$")
  filter = filter or {}
  for i,addon in ipairs(self:all_addons()) do
    if (common.first(addon.replaces or {}, function(replaces) return replaces == id end) or
      common.first(addon.provides or {}, function(provides) return provides == id end) or
      (addon.id == id or (wildcard and addon.id:find("^" .. id:sub(1, #id - 1))))) and
      match_version(addon.version, version) and (not filter.mod_version or not addon.mod_version or compatible_modversion(filter.mod_version, addon.mod_version))
    then
      table.insert(candidates, addon)
    end
  end
  return table.unpack(common.sort(common.uniq(candidates), function (a,b)
    return (a.replaces == id and b.replaces ~= id) or (a.version > b.version)
  end))
end

local function get_repository(url)
  if not url then error("requires a repository url") end
  local r = Repository.url(url)
  for i,v in ipairs(repositories) do
    if (v.repo_path and v.repo_path == r.repo_path) or (v.remote and v.remote == r.remote and v.branch == r.branch and v.commit == r.commit) then return i, v end
  end
  return nil
end


local function lpm_settings_save()
  common.write(CACHEDIR .. PATHSEP .. "settings.json", json.encode(settings))
end


local function lpm_repo_save()
  settings.repositories = common.map(repositories, function(r) return r:url() end)
  lpm_settings_save()
end



local DEFAULT_REPOS
local function lpm_repo_init(repos)
  DEFAULT_REPOS = { Repository.url("https://github.com/adamharrison/lite-xl-plugin-manager.git:latest") }
  if not system.stat(CACHEDIR .. PATHSEP .. "repos") then
    for i, repository in ipairs(repos or DEFAULT_REPOS) do
      if not system.stat(repository.local_path) then
        table.insert(repositories, repository:add(true))
      end
    end
    lpm_repo_save()
  end
end




local function lpm_repo_add(...)
  for i, url in ipairs({ ... }) do
    local idx, repo = get_repository(url)
    if repo then -- if we're alreayd a repo, put this at the head of the resolution list
      table.remove(repositories, idx)
    else
      repo = Repository.url(url):add(AUTO_PULL_REMOTES and "recursive" or false)
    end
    table.insert(repositories, 1, repo)
    repo:update()
  end
  lpm_repo_save()
end


local function lpm_repo_rm(...)
  for i, url in ipairs({ ... }) do
    local idx, repo = get_repository(url)
    if not repo then error("cannot find repository " .. url) end
    table.remove(repositories, idx)
    repo:remove()
  end
  lpm_repo_save()
end


local function lpm_repo_update(...)
  local t = { ... }
  if #t == 0 then table.insert(t, false) end
  for i, url in ipairs(t) do
    local repo = url and get_repository(url)
    for i,v in ipairs(repositories) do
      if not repo or v == repo then
        v:update(AUTO_PULL_REMOTES and "recursive" or false)
      end
    end
  end
end

local function get_lite_xl(version)
  return common.first(common.concat(lite_xls, common.flat_map(repositories, function(e) return e.lite_xls end)), function(lite_xl) return lite_xl.version == version end)
end

local function lpm_lite_xl_save()
  settings.lite_xls = common.map(common.grep(lite_xls, function(l) return l:is_local() and not l:is_system() end), function(l) return { version = l.version, mod_version = l.mod_version, path = l.path, binary_path = l.binary_path, datadir_path = l.datadir_path } end)
  lpm_settings_save()
end

local function lpm_lite_xl_add(version, path)
  if not version then error("requires a version") end
  if not version:find("^%d") then error("versions must begin numerically (i.e. 2.1.1-debug)") end
  if common.first(lite_xls, function(lite_xl) return lite_xl.version == version end) then error(version .. " lite-xl already exists") end
  local binary_path  = BINARY or (path and(path .. PATHSEP .. "lite-xl" .. EXECUTABLE_EXTENSION))
  local data_path = DATADIR or (path and (path .. PATHSEP .. "data"))
  if not system.stat(binary_path) then error("can't find " .. binary_path) end
  if not system.stat(data_path) then error("can't find " .. data_path) end
  table.insert(lite_xls, LiteXL.new(nil, { version = version, binary_path = { [ARCH[1]] = binary_path }, datadir_path = data_path, path = path:gsub(PATHSEP .. "$", ""), mod_version = MOD_VERSION or LATEST_MOD_VERSION }))
  lpm_lite_xl_save()
end

local function lpm_lite_xl_rm(version)
  if not version then error("requires a version") end
  local lite_xl = get_lite_xl(version) or error("can't find lite_xl version " .. version)
  lite_xls = common.grep(lite_xls, function(l) return l ~= lite_xl end)
  lpm_lite_xl_save()
end

local function lpm_lite_xl_install(version)
  if not version then error("requires a version") end
  (get_lite_xl(version) or error("can't find lite-xl version " .. version)):install()
end


local function lpm_lite_xl_switch(version, target)
  if not version then error("requires a version") end
  target = target or common.path("lite-xl" .. EXECUTABLE_EXTENSION)
  if not target then error("can't find installed lite-xl. please provide a target to install the symlink explicitly as a second argument") end
  local lite_xl = get_lite_xl(version) or error("can't find lite-xl version " .. version)
  if not lite_xl:is_installed() then log_action("Installing lite-xl " .. lite_xl.version) lite_xl:install() end
  local stat = system.stat(target)
  if stat and stat.symlink then os.remove(target) end
  system.symlink(lite_xl:get_binary_path(), target)
  if not common.path('lite-xl' .. EXECUTABLE_EXTENSION) then
    os.remove(target)
    error(target .. " is not on your $PATH; please supply a target that can be found on your $PATH, called `lite-xl`.")
  end
end


local function lpm_lite_xl_uninstall(version)
  (get_lite_xl(version) or error("can't find lite-xl version " .. version)):uninstall()
end


local function lpm_lite_xl_list()
  local result = { ["lite-xls"] = { } }
  local max_version = 0
  for i,lite_xl in ipairs(lite_xls) do
    table.insert(result["lite-xls"], {
      version = lite_xl.version,
      mod_version = lite_xl.mod_version,
      tags = lite_xl.tags,
      is_system = lite_xl:is_system(),
      is_installed = lite_xl:is_installed(),
      status = (lite_xl:is_installed() or lite_xl:is_system()) and (lite_xl:is_local() and "local" or "installed") or "available",
      local_path = lite_xl:is_installed() and lite_xl.local_path or nil,
      datadir_path = lite_xl:is_installed() and lite_xl.datadir_path or nil,
      binary_path = lite_xl:is_installed() and lite_xl.binary_path or nil
    })
    max_version = math.max(max_version, #lite_xl.version)
  end
  for i,repo in ipairs(repositories) do
    if not repo.lite_xls then error("can't find lite-xl for repo " .. repo:url()) end
    for j, lite_xl in ipairs(repo.lite_xls) do
      table.insert(result["lite-xls"], {
        version = lite_xl.version,
        mod_version = lite_xl.mod_version,
        repository = repo:url(),
        tags = lite_xl.tags,
        is_system = lite_xl:is_system(),
        is_installed = lite_xl:is_installed(),
        status = (lite_xl:is_installed() or lite_xl:is_system()) and (lite_xl:is_local() and "local" or "installed") or "available",
        local_path = lite_xl:is_installed() and lite_xl.local_path
      })
      max_version = math.max(max_version, #lite_xl.version)
    end
  end
  if JSON then
    io.stdout:write(json.encode(result) .. "\n")
  else
    if VERBOSE then
      for i, lite_xl in ipairs(result["lite-xls"]) do
        if i ~= 0 then print("---------------------------") end
        print("Version:       " .. lite_xl.version)
        print("Status:        " .. lite_xl.status)
        print("Mod-Version:   " .. (lite_xl.mod_version or "unknown"))
        print("Tags:          " .. common.join(", ", lite_xl.tags))
      end
    else
      max_version = max_version + 2
      print(string.format("%" .. max_version .. "s | %10s | %s", "Version", "Status", "Location"))
      print(string.format("%" .. max_version .."s | %10s | %s", "-------", "---------", "---------------------------"))
      for i, lite_xl in ipairs(result["lite-xls"]) do
        print(string.format("%" .. max_version .. "s | %10s | %s", (lite_xl.is_system and "* " or "") .. lite_xl.version, lite_xl.status, (lite_xl.is_installed and lite_xl.local_path or lite_xl.repository)))
      end
    end
  end
end

local function lpm_lite_xl_run(version, ...)
  if not version then error("requires a version or arguments") end
  local arguments = { ... }
  if not version:find("^%d+") and version ~= "system" then
    table.insert(arguments, 1, version)
    version = "system"
  end
  local lite_xl = get_lite_xl(version) or error("can't find lite-xl version " .. version)
  local addons = {}
  local i = 1
  while i <= #arguments do
    if arguments[i] == "--" then break end
    local str = arguments[i]
    if str:find("^http") then
      table.insert(repositories, 1, Repository.url(str):add())
    else
      local id, version = common.split(":", str)
      local potentials = { system_bottle:get_addon(id, version, { mod_version = lite_xl.mod_version }) }
      if #potentials == 0 then error("can't find addon " .. str) end
      local uniq = {}
      for i, addon in ipairs(potentials) do
        if not addon:is_core(system_bottle) and not addon:is_orphan(system_bottle) and not uniq[addon.id] then
          table.insert(addons, addon)
          uniq[addon.id] = true
        end
      end
    end
    i = i + 1
  end
  local bottle = Bottle.new(lite_xl, addons)
  if not bottle:is_constructed() or REINSTALL then bottle:construct() end
  return function()
    bottle:run(common.slice(arguments, i + 1))
  end
end


local function lpm_install(type, ...)
  for i, identifier in ipairs({ ... }) do
    local s = identifier:find(":")
    local id, version = (s and identifier:sub(1, s-1) or identifier), (s and identifier:sub(s+1) or nil)
    if not id then error('unrecognized identifier ' .. identifier) end
    if id == "lite-xl" then
      lpm_lite_xl_install(version)
    else
      local potential_addons = { system_bottle:get_addon(id, version, { mod_version = system_bottle.lite_xl.mod_version }) }
      local addons = common.grep(potential_addons, function(e) return not e:is_installed(system_bottle) or REINSTALL end)
      if #addons == 0 and #potential_addons == 0 then error("can't find " .. (type or "addon") .. " " .. id .. " mod-version: " .. (system_bottle.lite_xl.mod_version or 'any')) end
      if #addons == 0 then
        log_warning((potential_addons[1].type or "addon") .. " " .. id .. " already installed")
      else
        for j,v in ipairs(addons) do 
          v:install(system_bottle) 
          table.insert(settings.installed, v.id)
        end
      end
    end
  end
  lpm_settings_save()
end

local function check_dependency(dependency)
  if common.first(settings.installed, function(id) return dependency.id == id end) then return true end
  return #common.grep(system_bottle:installed_addons(), function(addon) return addon:depends_on(dependency) end) > 0
end

local function lpm_addon_uninstall(type, ...)
  for i, id in ipairs({ ... }) do
    local addons = { system_bottle:get_addon(id) }
    if #addons == 0 then error("can't find addon " .. id) end
    local installed_addons = common.grep(addons, function(e) return e:is_installed(system_bottle) end)
    if #installed_addons == 0 then error("addon " .. id .. " not installed") end
    for i, addon in ipairs(installed_addons) do 
      addon:uninstall(system_bottle) 
      settings.installed = common.grep(settings.installed, function(e) return e ~= addon.id end)
      for id, options in pairs(addon.dependencies) do
        local dependency = system_bottle:get_addon(id, options.version)
        if dependency and dependency:is_installed(system_bottle) and not check_dependency(dependency) then
          if prompt(dependency.id .. " is now an orphaned dependency. Should we uninstall it?") then
            dependency:uninstall(system_bottle)
          end
        end
      end
    end
  end
  lpm_settings_save()
end

local function lpm_addon_reinstall(type, ...) for i, id in ipairs({ ... }) do pcall(lpm_addon_uninstall, type, id) end lpm_install(type, ...) end

local function lpm_repo_list()
  if JSON then
    io.stdout:write(json.encode({ repositories = common.map(repositories, function(repo) return { remote = repo.remote, commit = repo.commit, branch = repo.branch, path = repo.local_path, remotes = common.map(repo.remotes or {}, function(r) return r:url() end)  } end) }) .. "\n")
  else
    for i, repository in ipairs(repositories) do
      local _, remotes = repository:parse_manifest()
      if i ~= 0 then print("---------------------------") end
      if not repository:is_local() then print("Remote :  " .. repository:url()) end
      print("Path   :  " .. repository.local_path)
      print("Remotes:  " .. json.encode(common.map(repository.remotes or {}, function(r) return r:url() end)))
    end
  end
end

local function lpm_addon_list(type, id, filters)
  local max_id = 4
  local plural = (type or "addon") .. "s"
  local result = { [plural] = { } }
  for j,addon in ipairs(common.grep(system_bottle:all_addons(), function(p) return (not type or p.type == type) and (not id or p.id:find(id)) end)) do
    max_id = math.max(max_id, #addon.id)
    local repo = addon.repository
    local hash = {
      id = addon.id,
      status = addon.repository and (addon:is_installed(system_bottle) and "installed" or (system_bottle.lite_xl:is_compatible(addon) and "available" or "incompatible")) or (addon:is_bundled(system_bottle) and "bundled" or (addon:is_core(system_bottle) and "core" or (addon:is_upgradable(system_bottle) and "upgradable" or "orphan"))),
      version = "" .. addon.version,
      dependencies = addon.dependencies,
      remote = addon.remote,
      description = addon.description,
      author = addon.author or (addon:is_core(system_bottle) and "lite-xl") or nil,
      mod_version = addon.mod_version,
      tags = addon.tags,
      type = addon.type,
      organization = addon.organization,
      repository = repo and repo:url(),
      path = addon:get_path(system_bottle)
    }
    if addon_matches_filter(hash, filters) then table.insert(result[plural], hash) end
  end
  if JSON then
    io.stdout:write(json.encode(result) .. "\n")
  elseif #result[plural] > 0 then
    if not VERBOSE then
      print(string.format("%" .. max_id .."s | %10s | %10s | %10s | %s", "ID", "Version", "Type", "ModVer", "Status"))
      print(string.format("%" .. max_id .."s | %10s | %10s | %10s | %s", string.rep("-", max_id), "-------", "----", "------", "-----------"))
    end
    for i, addon in ipairs(common.sort(result[plural], function(a,b) return a.id < b.id end)) do
      if VERBOSE then
        if i ~= 0 then print("---------------------------") end
        print("ID:            " .. addon.id)
        print("Name:          " .. (addon.name or addon.id))
        print("Version:       " .. addon.version)
        print("Status:        " .. addon.status)
        print("Author:        " .. (addon.author or ""))
        print("Type:          " .. addon.type)
        print("Orgnization:   " .. addon.organization)
        print("Repository:    " .. (addon.repository or "orphan"))
        print("Remote:        " .. (addon.remote or ""))
        print("Description:   " .. (addon.description or ""))
        print("Mod-Version:   " .. (addon.mod_version or "unknown"))
        print("Dependencies:  " .. json.encode(addon.dependencies))
        print("Tags:          " .. common.join(", ", addon.tags))
        print("Path:          " .. (addon.path or ""))
      elseif addon.status ~= "incompatible" then
        print(string.format("%" .. max_id .."s | %10s | %10s | %10s | %s", addon.id, addon.version, addon.type, addon.mod_version or "n/a", addon.status))
      end
    end
  end
end

local function lpm_describe()
  for i,v in ipairs(repositories) do
    if #common.grep(DEFAULT_REPOS, function(r) return r:url() == v:url() end) == 0 then
      io.stdout:write("lpm add " .. v:url() .. " && ")
    end
  end
  print("lpm run " .. system_bottle.lite_xl.version .. " " .. common.join(" ", common.map(system_bottle:installed_addons(), function(p) return p.id .. ":" .. p.version end)))
end

local function lpm_addon_upgrade()
  for i,addon in ipairs(system_bottle:installed_addons()) do
    local upgrade = common.sort({ system_bottle:get_addon(addon.id, ">" .. addon.version) }, function(a, b) return compare_version(b.version, a.version) end)[1]
    if upgrade then upgrade:install(system_bottle) end
  end
end

local function lpm_bottle_purge()
  common.rmrf(CACHEDIR .. PATHSEP .. "bottles")
end

local function lpm_purge()
  log_action("Removed " .. CACHEDIR .. ".")
  common.rmrf(CACHEDIR)
end

local function parse_arguments(arguments, options)
  local args = {}
  local i = 1
  while i <= #arguments do
    local s,e, option, value = arguments[i]:find("%-%-([^=]+)=?(.*)")
    if s then
      local flag_type = options[option]
      if not flag_type then error("unknown flag --" .. option) end
      if flag_type == "flag" then
        args[option] = true
      elseif flag_type == "string" or flag_type == "number" or flag_type == "array" then
        if not value or value == "" then
          if i == #arguments then error("option " .. option .. " requires a " .. flag_type) end
          value = arguments[i+1]
          i = i + 1
        end
        if flag_type == "number" and tonumber(flag_type) == nil then error("option " .. option .. " should be a number") end
        if flag_type == "array" then
          args[option] = args[option] or {}
          table.insert(args[option], value)
        else
          args[option] = value
        end
      end
    else
      table.insert(args, arguments[i])
    end
    i = i + 1
  end
  return args
end


local function run_command(ARGS)
  if not ARGS[2]:find("%S") then return
  elseif ARGS[2] == "init" then return
  elseif ARGS[2] == "repo" and ARGV[3] == "add" then lpm_repo_add(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "repo" and ARGS[3] == "rm" then lpm_repo_rm(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "add" then lpm_repo_add(table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "rm" then lpm_repo_rm(table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "update" then lpm_repo_update(table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "repo" and ARGS[3] == "update" then lpm_repo_update(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "repo" and (#ARGS == 2 or ARGS[3] == "list") then return lpm_repo_list()
  elseif (ARGS[2] == "plugin" or ARGS[2] == "color" or ARGS[2] == "library") and ARGS[3] == "install" then lpm_install(ARGS[2], table.unpack(common.slice(ARGS, 4)))
  elseif (ARGS[2] == "plugin" or ARGS[2] == "color" or ARGS[2] == "library") and ARGS[3] == "uninstall" then lpm_addon_uninstall(ARGS[2], table.unpack(common.slice(ARGS, 4)))
  elseif (ARGS[2] == "plugin" or ARGS[2] == "color" or ARGS[2] == "library") and ARGS[3] == "reinstall" then lpm_addon_reinstall(ARGS[2], table.unpack(common.slice(ARGS, 4)))
  elseif (ARGS[2] == "plugin" or ARGS[2] == "color" or ARGS[2] == "library") and (#ARGS == 2 or ARGS[3] == "list") then return lpm_addon_list(ARGS[2], ARGS[4], ARGS)
  elseif ARGS[2] == "upgrade" then return lpm_addon_upgrade(table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "install" then lpm_install(nil, table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "uninstall" then lpm_addon_uninstall(nil, table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "reinstall" then lpm_addon_reinstall(nil, table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "describe" then lpm_describe(nil, table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "list" then return lpm_addon_list(nil, ARGS[3], ARGS)
  elseif ARGS[2] == "lite-xl" and (#ARGS == 2 or ARGS[3] == "list") then return lpm_lite_xl_list(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "lite-xl" and ARGS[3] == "uninstall" then return lpm_lite_xl_uninstall(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "lite-xl" and ARGS[3] == "install" then return lpm_lite_xl_install(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "lite-xl" and ARGS[3] == "switch" then return lpm_lite_xl_switch(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "lite-xl" and ARGS[3] == "run" then return lpm_lite_xl_run(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "lite-xl" and ARGS[3] == "add" then return lpm_lite_xl_add(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "lite-xl" and ARGS[3] == "rm" then return lpm_lite_xl_rm(table.unpack(common.slice(ARGS, 4)))
  elseif ARGS[2] == "bottle" and ARGS[3] == "purge" then return lpm_bottle_purge(common.slice(ARGS, 4))
  elseif ARGS[2] == "run" then return lpm_lite_xl_run(table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "switch" then return lpm_lite_xl_switch(table.unpack(common.slice(ARGS, 3)))
  elseif ARGS[2] == "purge" then lpm_purge()
  else error("unknown command: " .. ARGS[2]) end
  if JSON then
    io.stdout:write(json.encode({ actions = actions, warnings = warnings }))
  end
end


xpcall(function()
  local ARGS = parse_arguments(ARGV, {
    json = "flag", userdir = "string", cachedir = "string", version = "flag", verbose = "flag",
    quiet = "flag", version = "flag", ["mod-version"] = "string", remotes = "flag", help = "flag",
    remotes = "flag", ["ssl-certs"] = "string", force = "flag", arch = "array", ["assume-yes"] = "flag",
    ["no-install-optional"] = "flag", datadir = "string", binary = "string", trace = "flag", progress = "flag",
    symlink = "flag", reinstall = "flag",
    -- filtration flags
    author = "string", tag = "string", stub = "string", dependency = "string", status = "string",
    type = "string", name = "string"
  })
  if ARGS["version"] then
    io.stdout:write(VERSION .. "\n")
    return 0
  end
  if ARGS["help"] or #ARGS == 1 or ARGS[2] == "help" then
    io.stderr:write([[
Usage: lpm COMMAND [...ARGUMENTS] [--json] [--userdir=directory]
  [--cachedir=directory] [--quiet] [--version] [--help] [--remotes]
  [--ssl-certs=directory/file] [--force] [--arch=]] .. _G.ARCH .. [[]
  [--assume-yes] [--no-install-optional] [--verbose] [--mod-version=3]
  [--datadir=directory] [--binary=path] [--symlink] [--post] [--reinstall]

LPM is a package manager for `lite-xl`, written in C (and packed-in lua).

It's designed to install packages from our central github repository (and
affiliated repositories), directly into your lite-xl user directory. It can
be called independently, or from the lite-xl `plugin_manager` addon.

LPM will always use https://github.com/lite-xl/lite-xl-plugin-manager as its base
repository, if none are present, and the cache directory does't exist,
but others can be added, and this base one can be removed.

It has the following commands:

  lpm init [repo 1] [repo 2] [...]         Implicitly called before all commands
                                           if necessary, but can be called
                                           independently to save time later, or
                                           to set things up differently.

                                           Adds the built in repository to your
                                           repository list, and all `remotes`.

                                           If repo 1 ... is specified, uses that
                                           list of repositories as the base instead.

                                           If "none" is specified, initializes
                                           an empty repository list.

  lpm repo list                            List all extant repos.
  lpm [repo] add <repository remote>       Add a source repository.
    [...<repository remote>]
  lpm [repo] rm <repository remote>        Remove a source repository.
    [...<repository remote>]
  lpm [repo] update [<repository remote>]  Update all/the specified repos.
    [...<repository remote>]
  lpm [plugin|library|color] install       Install specific addons.
    <addon id>[:<version>]                 If installed, upgrades.
    [...<addon id>:<version>]
  lpm [plugin|library|color] uninstall     Uninstall the specific addon.
    <addon id> [...<addon id>]
  lpm [plugin|library|color] reinstall     Uninstall and installs the specific addon.
   <addon id> [...<addon id>]

  lpm [plugin|library|color] list          List all/associated addons.
   <remote> [...<remote>]

  lpm upgrade                              Upgrades all installed addons
                                           to new version if applicable.
  lpm [lite-xl] install <version>          Installs lite-xl. Infers the
    [binary] [datadir]                     paths on your system if not
                                           supplied. Automatically
                                           switches to be your system default
                                           if path auto inferred.
  lpm lite-xl add <version> <path>         Adds a local version of lite-xl to
                                           the managed list, allowing it to be
                                           easily bottled.
  lpm lite-xl remove <path>                Removes a local version of lite-xl
                                           from the managed list.
  lpm [lite-xl] switch <version> [<path>]  Sets the active version of lite-xl
                                           to be the specified version. Auto-detects
                                           current install of lite-xl; if none found
                                           path can be specified.
  lpm lite-xl list [name pattern]          Lists all installed versions of
     [...filters]                          lite-xl. Can specify the flags listed
                                           in the filtering seciton.
  lpm run <version> [...addons]            Sets up a "bottle" to run the specified
                                           lite version, with the specified addons
                                           and then opens it.
  lpm describe [bottle]                    Describes the bottle specified in the form
                                           of a list of commands, that allow someone
                                           else to run your configuration.
  lpm table <manifest path> [readme path]  Formats a markdown table of all specified
                                           addons. Dumps to stdout normally, but if
                                           supplied a readme, will remove all tables
                                           from the readme, and append the new one.

  lpm purge                                Completely purge all state for LPM.
  lpm -                                    Read these commands from stdin in
                                           an interactive print-eval loop.
  lpm help                                 Displays this help text.


Flags have the following effects:

  --json                   Performs all communication in JSON.
  --userdir=directory      Sets the lite-xl userdir manually.
                           If omitted, uses the normal lite-xl logic.
  --cachedir=directory     Sets the directory to store all repositories.
  --tmpdir=directory       During install, sets the staging area.
  --datadir=directory      Sets the data directory where core addons are located
                           for the system lite-xl.
  --binary=path            Sets the lite-xl binary path for the system lite-xl.
  --verbose                Spits out more information, including intermediate
                           steps to install and whatnot.
  --quiet                  Outputs nothing but explicit responses.
  --mod-version=version    Sets the mod version of lite-xl to install addons.
  --version                Returns version information.
  --help                   Displays this help text.
  --ssl-certs              Sets the SSL certificate store. Can be a directory,
                           or path to a certificate bundle.
  --arch=architecture      Sets the architecture (default: ]] .. _G.ARCH .. [[).
  --assume-yes             Ignores any prompts, and automatically answers yes
                           to all.
  --no-install-optional    On install, anything marked as optional
                           won't prompt.
  --trace                  Dumps to STDERR useful debugging information, in
                           particular information relating to SSL connections,
                           and other network activity.
  --progress               For JSON mode, lines of progress as JSON objects.
                           By default, JSON does not emit progress lines.
  --symlink                Use symlinks where possible when installing modules.
                           If a repository contains a file of the same name as a
                           `files` download in the primary directory, will also
                           symlink that, rather than downloading.
  --reinstall              Ignores that things may be the same, and attempts
                           to reinstall all modules.

The following flags are useful when listing plugins, or generating the plugin
table. Putting a ! infront of the string will invert the filter. Multiple
filters of the same type can be specified to create an OR relationship.

  --author=author          Only display addons by the specified author.
  --tag=tag                Only display addons with the specified tag.
  --stub=git/file/false    Only display the specified stubs.
  --dependency=dep         Only display addons that have a dependency on the
                           specified addon.
  --status=status          Only display addons that have the specified status.
  --type=type              Only display addons on the specified type.
  --name=name              Only display addons that have a name which matches the
                           specified filter.

There also several flags which are classified as "risky", and are never enabled
in any circumstance unless explicitly supplied.

  --force                  Ignores checksum inconsistencies.
  --post                   Run post-install build steps. Must be explicitly enabled.
                           Official repositories must function without this
                           flag being needed; generally they must provide
                           binaries if there is a native compilation step.
  --remotes                Automatically adds any specified remotes in the
                           repository to the end of the resolution list.
  --ssl-certs=noverify     Ignores SSL certificate validation. Opens you up to
                           man-in-the-middle attacks.

There exist also other debug commands that are potentially useful, but are
not commonly used publically.

  lpm test [test file]               Runs the specified test suite.
  lpm table <manifest> [...filters]  Generates markdown table for the given
                                     manifest. Used by repositories to build
                                     READMEs.
  lpm download <url> [target]        Downloads the specified URL to stdout,
                                     or to the specified target file.
  lpm extract <file.[tar.gz|zip]>    Extracts the specified archive at
    [target]                         target, or the current working directory.
]]
    )
    return 0
  end

  VERBOSE = ARGS["verbose"] or false
  JSON = ARGS["json"] or os.getenv("LPM_JSON")
  QUIET = ARGS["quiet"] or os.getenv("LPM_QUIET")
  FORCE = ARGS["force"]
  POST = ARGS["post"]
  SYMLINK = ARGS["symlink"]
  PROGRESS = ARGS["progress"]
  REINSTALL = ARGS["reinstall"]
  DATADIR = common.normalize_path(ARGS["datadir"])
  BINARY = common.normalize_path(ARGS["binary"])
  NO_INSTALL_OPTIONAL = ARGS["no-install-optional"]
  ARCH = ARGS["arch"] or { _G.ARCH }
  ASSUME_YES = ARGS["assume-yes"] or FORCE
  MOD_VERSION = ARGS["mod-version"] or os.getenv("LPM_MODVERSION")
  if MOD_VERSION == "any" then MOD_VERSION = nil end
  HOME = (os.getenv("USERPROFILE") or os.getenv("HOME")):gsub(PATHSEP .. "$", "")
  USERDIR = common.normalize_path(ARGS["userdir"]) or os.getenv("LITE_USERDIR") or (os.getenv("XDG_CONFIG_HOME") and os.getenv("XDG_CONFIG_HOME") .. PATHSEP .. "lite-xl")
    or (HOME and (HOME .. PATHSEP .. '.config' .. PATHSEP .. 'lite-xl'))
  AUTO_PULL_REMOTES = ARGS["remotes"]
  if not system.stat(USERDIR) then common.mkdirp(USERDIR) end
  CACHEDIR = common.normalize_path(ARGS["cachedir"]) or os.getenv("LPM_CACHE") or USERDIR .. PATHSEP .. "lpm"
  TMPDIR = common.normalize_path(ARGS["tmpdir"]) or CACHEDIR .. PATHSEP .. "tmp"
  if ARGS["trace"] then system.trace(true) end

  if (not JSON and not QUIET and (TTY or PROGRESS)) or (JSON and PROGRESS) then
    local start_time, last_read
    local function format_bytes(bytes)
      if bytes < 1024 then return string.format("%6d  B", math.floor(bytes)) end
      if bytes < 1*1024*1024 then return string.format("%6.1f kB", bytes / 1024) end
      if bytes < 1*1024*1024*1024 then return string.format("%6.1f MB", bytes / (1024*1024))  end
      return string.format("%6.2f GB", bytes / (1024*1024*1024))
    end
    if JSON then
      write_progress_bar = function(total_read, total_objects_or_content_length, indexed_objects, received_objects, local_objects, local_deltas, indexed_deltas)
        if type(total_read) == "boolean" then
          io.stdout:write(json.encode({ progress = { percent = 1, label = progress_bar_label } }) .. "\n")
          io.stdout:flush()
          return
        end
        if not last_read then last_read = system.time() end
        if not last_read or system.time() - last_read > 0.05 then
          io.stdout:write(json.encode({ progress = { percent = (received_objects and (received_objects/total_objects_or_content_length) or (total_read/total_objects_or_content_length) or 0), label = progress_bar_label } }) .. "\n")
          io.stdout:flush()
          last_read = system.time()
        end
      end
    else
      write_progress_bar = function(total_read, total_objects_or_content_length, indexed_objects, received_objects, local_objects, local_deltas, indexed_deltas)
        if type(total_read) == "boolean" then
          io.stdout:write("\n")
          io.stdout:flush()
          return
        end
        if not start_time or total_read < last_read then start_time = system.time() end
        local status_line = string.format("%s [%s/s][%03d%%]: %s", format_bytes(total_read), format_bytes(total_read / (system.time() - start_time)), math.floor((received_objects and (received_objects/total_objects_or_content_length) or (total_read/total_objects_or_content_length) or 0)*100), progress_bar_label)
        io.stdout:write("\r")
        io.stdout:write(status_line)
        io.stdout:flush()
        last_read = total_read
      end
    end
  end

  repositories = {}
  if ARGS[2] == "purge" then return lpm_purge() end
  local ssl_certs = ARGS["ssl-certs"] or os.getenv("SSL_CERT_DIR") or os.getenv("SSL_CERT_FILE")
  if ssl_certs then
    if ssl_certs == "noverify" then
      system.certs("noverify")
    else
      local stat = system.stat(ssl_certs)
      if not stat then error("can't find " .. ssl_certs) end
      system.certs(stat.type, ssl_certs)
    end
  else
    local paths = { -- https://serverfault.com/questions/62496/ssl-certificate-location-on-unix-linux#comment1155804_62500
      "/etc/ssl/certs/ca-certificates.crt",                -- Debian/Ubuntu/Gentoo etc.
      "/etc/pki/tls/certs/ca-bundle.crt",                  -- Fedora/RHEL 6
      "/etc/ssl/ca-bundle.pem",                            -- OpenSUSE
      "/etc/pki/tls/cacert.pem",                           -- OpenELEC
      "/etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem", -- CentOS/RHEL 7
      "/etc/ssl/cert.pem",                                 -- Alpine Linux (and Mac OSX)
      "/etc/ssl/certs",                                    -- SLES10/SLES11, https://golang.org/issue/12139
      "/system/etc/security/cacerts",                      -- Android
      "/usr/local/share/certs",                            -- FreeBSD
      "/etc/pki/tls/certs",                                -- Fedora/RHEL
      "/etc/openssl/certs",                                -- NetBSD
      "/var/ssl/certs",                                    -- AIX
    }
    if PLATFORM == "windows" then
      common.mkdirp(TMPDIR)
      system.certs("system", TMPDIR .. PATHSEP .. "certs.crt")
    else
      local has_certs = false
      for i, path in ipairs(paths) do
        local stat = system.stat(path)
        if stat then
          has_certs = true
          system.certs(stat.type, path)
          break
        end
      end
      if not has_certs then error("can't autodetect your system's SSL ceritficates; please specify specify a certificate bundle or certificate directory with --ssl-certs") end
    end
  end

  -- Small utility functions that don't play into the larger app; are used for testing
  -- or for handy scripts.
  if ARGS[2] == "test" then
    rawset(_G, "arg", common.slice(ARGS, 4))
    dofile(ARGS[3])
    os.exit(0)
  end
  if ARGS[2] == "download" then
    local file = common.get(ARGS[3], ARGS[4]);
    if file then print(file) end
    os.exit(0)
  end
  if ARGS[2] == "hash" then
    print(system.hash(ARGS[3], "file"))
    os.exit(0)
  end
  if ARGS[2] == "extract" then
    system.extract(ARGS[3], ARGS[4] or ".")
    os.exit(0)
  end
  if ARGS[2] == "table" then
    local info = json.decode(common.read(ARGS[3]))
    local addons = common.grep(info["addons"] or info["plugins"], function(addon) return addon_matches_filter(addon, ARGS) end)
    if #addons == 0 then return end
    table.sort(addons, function(a,b) return string.lower(a.name or a.id) < string.lower(b.name or b.id) end)
    local ids = common.map(addons, function(addon)
      if addon.path and addon.path:find(".lua$") then return string.format("[`%s`](%s?raw=1)", addon.name or addon.id, addon.path) end
      if addon.path then return string.format("[`%s`](%s)", addon.name or addon.id, addon.path) end
      if addon.url then return string.format("[`%s`](%s)\\*", addon.name or addon.id, addon.url) end
      if addon.remote then return string.format("[`%s`](%s)\\*", addon.name or addon.id, addon.remote:gsub(":%w+$", "")) end
      return addon.name or addon.id
    end)
    local descriptions = common.map(addons, function(e) return e.description or "" end)
    local max_description = math.max(table.unpack(common.map(descriptions, function(e) return #e end)))
    local max_id = math.max(table.unpack(common.map(ids, function(e) return #e end)))
    local t = { }
    table.insert(t, "| Plugin" .. string.rep(" ", max_id - 6) .. " | Description" .. string.rep(" ", max_description - 11) .. " |")
    table.insert(t, "| :" .. string.rep("-", max_id-1) .. " | :" .. string.rep("-", max_description - 1) .. " |")
    for i = 1, #addons do
      table.insert(t, "| " .. ids[i] .. string.rep(" ", max_id - #ids[i]) .. " | " .. descriptions[i] .. string.rep(" ", max_description - #descriptions[i]) .. " |")
    end
    if ARGS[4] then
      local file = {}
      for line in io.lines(ARGS[4]) do
        if not line:find("^|.*") then
          table.insert(file, line)
        end
      end
      io.open(ARGS[4], "wb"):write(table.concat(file, "\n") .. "\n" .. table.concat(t, "\n") .. "\n")
    else
      print(table.concat(t, "\n"))
    end
    os.exit(0)
  end

  -- Base setup; initialize default repos if applicable, read them in. Determine Lite XL system binary if not specified, and pull in a list of all local lite-xl's.
  engage_locks(function()
    settings = { lite_xls = {}, repositories = {}, installed = {} }
    lpm_repo_init(ARGS[2] == "init" and #ARGS > 2 and (ARGS[3] ~= "none" and common.map(common.slice(ARGS, 3), function(url) return Repository.url(url) end) or {}) or nil)
    repositories, lite_xls = {}, {}
    if system.stat(CACHEDIR .. PATHSEP .. "settings.json") then settings = json.decode(common.read(CACHEDIR .. PATHSEP .. "settings.json")) end
    repositories = common.map(settings.repositories or {}, function(url) local repo = Repository.url(url) repo:parse_manifest() return repo end)
    lite_xls = common.map(settings.lite_xls or {}, function(lite_xl) return LiteXL.new(nil, { version = lite_xl.version, mod_version = lite_xl.mod_version, binary_path = lite_xl.binary_path, datadir_path = lite_xl.datadir_path, path = lite_xl.path, tags = { "local" } }) end)
    
    if BINARY and not system.stat(BINARY) then error("can't find specified --binary") end
    if DATADIR and not system.stat(DATADIR) then error("can't find specified --datadir") end
    local lite_xl_binary = BINARY or common.path("lite-xl" .. EXECUTABLE_EXTENSION)
    if lite_xl_binary then
      local stat = system.stat(lite_xl_binary)
      if not stat then error("can't find lite-xl binary " .. lite_xl_binary) end
      lite_xl_binary = stat.symlink or lite_xl_binary
      local directory = common.dirname(lite_xl_binary)
      local hash = system.hash(lite_xl_binary, "file")
      local system_lite_xl = common.first(common.concat(common.flat_map(repositories, function(r) return r.lite_xls end), lite_xls), function(lite_xl) return lite_xl.local_path == directory end)
      if not system_lite_xl then
        system_lite_xl = common.first(lite_xls, function(e) return e.version == "system" end)
        if system_lite_xl then error("can't find existing system lite (does " .. system_lite_xl:get_binary_path() .. " exist? was it moved?); run `lpm purge`, or specify --binary and --datadir.") end
        local lite_xl_datadirs = { DATADIR, directory:find(PATHSEP .. "bin$") and common.dirname(directory .. PATHSEP .. "share" .. PATHSEP .. "lite-xl"), directory .. PATHSEP .. "data" }
        local lite_xl_datadir = common.first(lite_xl_datadirs, function(p) return p and system.stat(p) end)
        system_lite_xl = LiteXL.new(nil, { path = directory, datadir_path = lite_xl_datadir, binary_path = { [_G.ARCH] = lite_xl_binary }, mod_version = MOD_VERSION or LATEST_MOD_VERSION, version = "system", tags = { "system", "local" } })
        table.insert(lite_xls, system_lite_xl)
        lpm_lite_xl_save()
      else
        if DATADIR then system_lite_xl.datadir_path = DATADIR end
        table.insert(system_lite_xl.tags, "system")
      end
      system_bottle = Bottle.new(system_lite_xl, nil, true)
    else
      system_bottle = Bottle.new(LiteXL.new(nil, { mod_version = MOD_VERSION or LATEST_MOD_VERSION, datadir_path = DATADIR, version = "system", tags = { "system", "local" } }), nil, true)
    end
    if not system_bottle then system_bottle = Bottle.new(nil, nil, true) end
  end, error_handler, lock_warning)
  if ARGS[2] ~= '-' then
    local res
    engage_locks(function()
      res = run_command(ARGS)
    end, error_handler, lock_warning)
    if res then
      res()
    end
  else
    while true do
      local line = io.stdin:read("*line")
      if line == "quit" or line == "exit" then return 0 end
      local args = { ARGS[1] }
      local s = 1
      while true do
        local a,e = line:find("%s+", s)
        table.insert(args, line:sub(s, a and (a - 1) or #line))
        if not e then break end
        s = e + 1
      end
      xpcall(function()
        local res
        engage_locks(function()
          res = run_command(args)
        end, error_handler, lock_warning)
        if res then
          res()
        end
      end, error_handler)
      actions, warnings = {}, {}
    end
  end
end, error_handler)


return status