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-- mod-version:3
local core = require "core"
local common = require "core.common"
local command = require "core.command"
local keymap = require "core.keymap"
local Doc = require "core.doc"
local DocView = require "core.docview"
local navigate = {
list = {},
current = nil,
index = 0
}
--
-- Private functions
--
local function get_active_view()
if getmetatable(core.active_view) == DocView then
return core.active_view
end
return nil
end
-- Solution to safely remove elements from array table:
-- found at https://stackoverflow.com/a/53038524
local function array_remove(t, fnKeep)
local j, n = 1, #t;
for i=1, n do
if (fnKeep(t, i, j)) then
if (i ~= j) then
t[j] = t[i];
t[i] = nil;
end
j = j + 1;
else
t[i] = nil;
end
end
return t;
end
local function add(doc)
-- Make new navigation point last in list
if navigate.index > 0 and navigate.index < #navigate.list then
local remove_start = navigate.index + 1
local remove_end = #navigate.list
array_remove(navigate.list, function(_, i)
if i >= remove_start and i <= remove_end then
return false
end
return true
end)
end
local line, col = doc:get_selection()
table.insert(navigate.list, {
filename = doc.filename,
line = line,
col = col
})
navigate.current = navigate.list[#navigate.list]
navigate.index = #navigate.list
end
local function open_doc(doc)
core.root_view:open_doc(
core.open_doc(
common.home_expand(
doc.filename
)
)
)
local av_doc = get_active_view().doc
local line, col = av_doc:get_selection()
if doc.line ~= line or doc.col ~= col then
av_doc:set_selection(doc.line, doc.col, doc.line, doc.col)
end
end
--
-- Public functions
--
function navigate.next()
if navigate.index < #navigate.list then
navigate.index = navigate.index + 1
navigate.current = navigate.list[navigate.index]
open_doc(navigate.current)
end
end
function navigate.prev()
if navigate.index > 1 then
navigate.index = navigate.index - 1
navigate.current = navigate.list[navigate.index]
open_doc(navigate.current)
end
end
--
-- Thread
--
core.add_thread(function()
while true do
local av = get_active_view()
if av and av.doc and av.doc.filename then
local doc = av.doc
local line, col = doc:get_selection()
local current = navigate.current
if
not current
or
current.filename ~= doc.filename
or
current.line ~= line
then
add(doc)
else
current.col = col
end
end
coroutine.yield(0.5)
end
end)
--
-- Patching
--
local doc_on_close = Doc.on_close
function Doc:on_close()
local filename = self.filename
-- remove all positions referencing closed file
array_remove(navigate.list, function(t, i)
if t[i].filename == filename then
return false
end
return true
end)
doc_on_close(self)
end
--
-- Commands
--
command.add("core.docview", {
["navigate:previous"] = function()
navigate.prev()
end,
["navigate:next"] = function()
navigate.next()
end,
})
--
-- Default Keybindings
--
keymap.add {
["alt+left"] = "navigate:previous",
["alt+right"] = "navigate:next",
}
return navigate
|
