Merge pull request #64 from takase1121/open_ext

add open_ext.lua

2 files changed, 188 insertions, 0 deletions

diff --git a/README.md b/README.md
index ac39ff0..c17eb5e 100644
--- a/README.md
+++ b/README.md
@@ -112,6 +112,7 @@ Plugin | Description
 [`motiontrail`](plugins/motiontrail.lua?raw=1) | Adds a motion-trail to the caret *([screenshot](https://user-images.githubusercontent.com/3920290/83256814-085ccb00-a1ab-11ea-9e35-e6633cbed1a9.gif))*
 ~~[`nagbar`](https://github.com/takase1121/lite-nagbar)*~~ | integrated in lite-xl ~~consistent and _beautiful_ confirmation dialogs for lite and lite-xl *([gif](https://raw.githubusercontent.com/takase1121/lite-nagbar/master/assets/preview.gif))*~~
 [`navigate`](plugins/navigate.lua?raw=1) | Allows moving back and forward between document positions, reducing the amount of scrolling
+[`open_ext`](plugins/open_ext.lua?raw=1) | Automatically prompts you if you tried to open a binary file in the editor
 [`openfilelocation`](plugins/openfilelocation.lua?raw=1) | Opens the parent directory of the current file in the file manager
 [`openselected`](plugins/openselected.lua?raw=1) | Opens the selected filename or url
 ~~[`projectmanager`](plugins/projectmanager.lua?raw=1)~~ | Integrated in lite-xl with improvements ~~Save projects and load/reload them quickly~~
diff --git a/plugins/open_ext.lua b/plugins/open_ext.lua
new file mode 100644
index 0000000..f01ab85
--- /dev/null
+++ b/plugins/open_ext.lua
@@ -0,0 +1,187 @@
+-- mod-version:2 -- lite-xl 2.0
+
+-- The general idea is to check if the file opened is valid utf-8
+-- since lite-xl only supports UTF8 text, others can be safely assumed
+-- to be binary
+local core = require "core"
+local common = require "core.common"
+local style = require "core.style"
+local DocView = require "core.docview"
+local RootView = require "core.rootview"
+local View = require "core.view"
+
+
+local function validate_utf8(s, limit)
+  --[[
+    MIT LICENSE
+    Copyright (c) 2013 Enrique García Cota
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the
+    "Software"), to deal in the Software without restriction, including
+    without limitation the rights to use, copy, modify, merge, publish,
+    distribute, sublicense, and/or sell copies of the Software, and to
+    permit persons to whom the Software is furnished to do so, subject to
+    the following conditions:
+    The above copyright notice and this permission notice shall be included
+    in all copies or substantial portions of the Software.
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+    OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+    IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+    CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+    TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+    SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  ]]
+  limit = limit or math.huge
+  local i, p, len = 1, 1, #s
+  while p <= len do
+    if     p == s:find("[%z\1-\127]", p) then p = p + 1
+    elseif p == s:find("[\194-\223][\128-\191]", p) then p = p + 2
+    elseif p == s:find(       "\224[\160-\191][\128-\191]", p)
+        or p == s:find("[\225-\236][\128-\191][\128-\191]", p)
+        or p == s:find(       "\237[\128-\159][\128-\191]", p)
+        or p == s:find("[\238-\239][\128-\191][\128-\191]", p) then p = p + 3
+    elseif p == s:find(       "\240[\144-\191][\128-\191][\128-\191]", p)
+        or p == s:find("[\241-\243][\128-\191][\128-\191][\128-\191]", p)
+        or p == s:find(       "\244[\128-\143][\128-\191][\128-\191]", p) then p = p + 4
+    else
+      return false
+    end
+    i = i + 1
+    if i > limit then break end
+  end
+
+  return true
+end
+
+
+local function replace_view(this, that)
+  local node = core.root_view.root_node:get_node_for_view(this)
+  local idx = node:get_view_idx(this)
+  node:remove_view(core.root_view.root_node, this)
+  node:add_view(that, idx)
+  core.root_view.root_node:update_layout()
+  core.redraw = true
+end
+
+
+local msg = "This file is not displayed because it is either binary or uses an unsupported text encoding."
+local cmd -- here's evil code again...
+if PLATFORM == "Windows" then
+  cmd = "start %q"
+elseif PLATFORM == "Linux" then
+  cmd = "xdg-open %q"
+else
+  cmd = "open %q"
+end
+
+local opt = { "Open anyway", "Open with other program", "Close" }
+local opt_actions = {
+  function(self)
+    -- open anyway
+    local view = DocView(core.open_doc(self.filename))
+    replace_view(self, view)
+  end,
+  function(self)
+    -- open externally
+    local node = core.root_view.root_node:get_node_for_view(self)
+    node:close_view(core.root_view.root_node, self)
+    system.exec(string.format(cmd, self.filename))
+  end,
+  function(self)
+    local node = core.root_view.root_node:get_node_for_view(self)
+    node:close_view(core.root_view.root_node, self)
+  end
+}
+
+
+local OpenExtView = View:extend()
+
+
+function OpenExtView:new(filename)
+  OpenExtView.super.new(self)
+  self.filename = filename
+end
+
+
+function OpenExtView:get_name()
+  return common.basename(self.filename)
+end
+
+
+function OpenExtView:each_option()
+  return coroutine.wrap(function()
+    local w = (self.size.x - style.padding.x * (#opt + 1)) / #opt
+    local h = style.font:get_height() + style.padding.y
+    local x, y = self:get_content_offset()
+    x = x + style.padding.x
+    y = y + self.size.y / 2 + style.padding.y
+    for i, o in ipairs(opt) do
+      coroutine.yield(i, o, x, y, w, h)
+      x = x + w + style.padding.x
+    end
+  end)
+end
+
+
+function OpenExtView:on_mouse_moved(px, py, dx, dy)
+  OpenExtView.super.on_mouse_moved(self, px, py, dx, dy)
+  self.hovered = nil
+  for i, _, x, y, w, h in self:each_option() do
+    if px > x and px <= x + w and py > y and py <= y + h then
+      self.hovered = i
+      break
+    end
+  end
+end
+
+
+function OpenExtView:on_mouse_pressed(button, x, y, clicks)
+  if OpenExtView.super.on_mouse_pressed(self, button, x, y, clicks) then return end
+  if self.hovered then
+    opt_actions[self.hovered](self)
+  end
+end
+
+
+function OpenExtView:draw()
+  self:draw_background(style.background)
+  local x, y = self:get_content_offset()
+  local lh = style.font:get_height()
+  y = y + self.size.y / 2 - style.padding.y - lh
+  common.draw_text(style.font, style.text, msg, "center", x, y, self.size.x, lh)
+  for i, opt, x, y, w, h in self:each_option() do
+    local text_color = i == self.hovered and style.background or style.text
+    renderer.draw_rect(x, y, w, h, style.accent)
+    if i ~= self.hovered then
+      renderer.draw_rect(x + 1, y + 1, w - 2, h - 2, style.background)
+    end
+    common.draw_text(style.font, text_color, opt, "center", x, y, w, h)
+  end
+end
+
+
+local function read_from_doc(doc, limit)
+  local l, result = 0, {}
+  for _, line in ipairs(doc.lines) do
+    result[#result+1] = line
+    l = l + #line
+    if l >= limit then break end
+  end
+  return table.concat(result, "")
+end
+
+
+local rootview_open_doc = RootView.open_doc
+function RootView:open_doc(doc)
+  local str = read_from_doc(doc, 4 * 128) -- max size for 128 codepoints
+  if str == "\n" or str == "" and validate_utf8(str, 128) then
+    return rootview_open_doc(self, doc)
+  else
+    local node = self:get_active_node_default()
+    local view = OpenExtView(doc.abs_filename or doc.filename)
+    node:add_view(view)
+    self.root_node:update_layout()
+    return view
+  end
+end