path: root/core/gui.lua

-- Copyright 2007-2011 Mitchell mitchell<att>caladbolg.net. See LICENSE.

local L = locale.localize
local gui = gui

-- LuaDoc is in core/.gui.luadoc.
function gui.check_focused_buffer(buffer)
  if type(buffer) ~= 'table' or not buffer.doc_pointer then
    error(L('Buffer argument expected.'), 2)
  elseif gui.focused_doc_pointer ~= buffer.doc_pointer then
    error(L('This buffer is not the current one.'), 2)
  end
end

-- LuaDoc is in core/.gui.luadoc.
function gui._print(buffer_type, ...)
  local function safe_print(...)
    if buffer._type ~= buffer_type then
      -- Try to find a message buffer to print to. Otherwise create one.
      local message_buffer, message_buffer_index
      local message_view, message_view_index
      for i, buffer in ipairs(_BUFFERS) do
        if buffer._type == buffer_type then
          message_buffer, message_buffer_index = buffer, i
          for j, view in ipairs(_VIEWS) do
            if view.doc_pointer == message_buffer.doc_pointer then
              message_view, message_view_index = view, j
              break
            end
          end
          break
        end
      end
      if not message_view then
        local _, message_view = view:split(false) -- horizontal split
        if not message_buffer then
          message_buffer = new_buffer()
          message_buffer._type = buffer_type
          events.emit(events.FILE_OPENED)
        else
          message_view:goto_buffer(message_buffer_index, true)
        end
      else
        gui.goto_view(message_view_index, true)
      end
    end
    local args, n = {...}, select('#', ...)
    for i = 1, n do args[i] = tostring(args[i]) end
    buffer:append_text(table.concat(args, '\t'))
    buffer:append_text('\n')
    buffer:goto_pos(buffer.length)
    buffer:set_save_point()
  end
  pcall(safe_print, ...) -- prevent endless loops on error
end

-- LuaDoc is in core/.gui.luadoc.
function gui.print(...) gui._print(L('[Message Buffer]'), ...) end

-- LuaDoc is in core/.gui.luadoc.
function gui.filteredlist(title, columns, items, int_return, ...)
  local out = gui.dialog('filteredlist',
                         '--title', title,
                         '--button1', 'gtk-ok',
                         '--button2', 'gtk-cancel',
                         '--no-newline',
                         int_return and '' or '--string-output',
                         '--columns', columns,
                         '--items', items,
                         ...)
  local patt = int_return and '^(%-?%d+)\n(%d+)$' or '^([^\n]+)\n(.+)$'
  local response, value = out:match(patt)
  if response == (int_return and '1' or 'gtk-ok') then
    return not int_return and value or tonumber(value)
  end
end

-- LuaDoc is in core/.gui.luadoc.
function gui.switch_buffer()
  local columns, items = { L('Name'), L('File') }, {}
  for _, buffer in ipairs(_BUFFERS) do
    local filename = buffer.filename or buffer._type or L('Untitled')
    items[#items + 1] = (buffer.dirty and '*' or '')..filename:match('[^/\\]+$')
    items[#items + 1] = filename
  end
  local i = gui.filteredlist(L('Switch Buffers'), columns, items, true)
  if i then view:goto_buffer(i + 1, true) end
end

local connect = events.connect

-- Sets default properties for a Scintilla window.
connect(events.VIEW_NEW, function()
  local buffer = buffer
  local c = _SCINTILLA.constants

  -- Allow redefinitions of these Scintilla key commands.
  local ctrl_keys = {
    '[', ']', '/', '\\', 'Z', 'Y', 'X', 'C', 'V', 'A', 'L', 'T', 'D', 'U'
  }
  local ctrl_shift_keys = { 'L', 'T', 'U', 'Z' }
  for _, key in ipairs(ctrl_keys) do
    buffer:clear_cmd_key(string.byte(key), c.SCMOD_CTRL)
  end
  for _, key in ipairs(ctrl_shift_keys) do
    buffer:clear_cmd_key(string.byte(key), c.SCMOD_CTRL + c.SCMOD_SHIFT)
  end

  if _THEME and #_THEME > 0 then
    local ok, err = pcall(dofile, _THEME..'/view.lua')
    if not ok then io.stderr:write(err) end
  end
end)
connect(events.VIEW_NEW, function() events.emit(events.UPDATE_UI) end)

local SETDIRECTFUNCTION = _SCINTILLA.properties.direct_function[1]
local SETDIRECTPOINTER = _SCINTILLA.properties.doc_pointer[2]
local SETLEXERLANGUAGE = _SCINTILLA.functions.set_lexer_language[1]
-- Sets default properties for a Scintilla document.
connect(events.BUFFER_NEW, function()
  local function run()
    local buffer = buffer
    local c = _SCINTILLA.constants

    -- Lexer.
    buffer:set_lexer_language('lpeg')
    buffer:private_lexer_call(SETDIRECTFUNCTION, buffer.direct_function)
    buffer:private_lexer_call(SETDIRECTPOINTER, buffer.direct_pointer)
    buffer:private_lexer_call(SETLEXERLANGUAGE, 'container')
    buffer.style_bits = 8

    -- Properties.
    buffer.property['textadept.home'] = _HOME
    buffer.property['lexer.lpeg.home'] = _LEXERPATH
    buffer.property['lexer.lpeg.script'] = _HOME..'/lexers/lexer.lua'
    if _THEME and #_THEME > 0 then
      buffer.property['lexer.lpeg.color.theme'] = _THEME..'/lexer.lua'
    end

    -- Buffer.
    buffer.code_page = c.SC_CP_UTF8
    buffer.eol_mode = not WIN32 and c.SC_EOL_LF or c.SC_EOL_CRLF

    if _THEME and #_THEME > 0 then
      local ok, err = pcall(dofile, _THEME..'/buffer.lua')
      if not ok then io.stderr:write(err) end
    end
  end
  -- Normally when an error occurs, a new buffer is created with the error
  -- message, but if an error occurs here, this event would be called again and
  -- again, erroring each time resulting in an infinite loop; print error to
  -- stderr instead.
  local ok, err = pcall(run)
  if not ok then io.stderr:write(err) end
end)
connect(events.BUFFER_NEW, function() events.emit(events.UPDATE_UI) end)

-- Sets the title of the Textadept window to the buffer's filename.
-- @param buffer The currently focused buffer.
local function set_title(buffer)
  local filename = buffer.filename or buffer._type or L('Untitled')
  gui.title = string.format('%s %s Textadept (%s)', filename:match('[^/\\]+$'),
                            buffer.dirty and '*' or '-', filename)
end

-- Changes Textadept title to show 'clean' buffer.
connect(events.SAVE_POINT_REACHED, function()
  buffer.dirty = false
  set_title(buffer)
end)

-- Changes Textadept title to show 'dirty' buffer.
connect(events.SAVE_POINT_LEFT, function()
  buffer.dirty = true
  set_title(buffer)
end)

-- Open uri(s).
connect(events.URI_DROPPED, function(utf8_uris)
  for utf8_uri in utf8_uris:gmatch('[^\r\n]+') do
    if utf8_uri:find('^file://') then
      utf8_uri = utf8_uri:match('^file://([^\r\n]+)')
      utf8_uri = utf8_uri:gsub('%%(%x%x)', function(hex)
        return string.char(tonumber(hex, 16))
      end)
      if WIN32 then utf8_uri = utf8_uri:sub(2, -1) end -- ignore leading '/'
      local uri = utf8_uri:iconv(_CHARSET, 'UTF-8')
      if lfs.attributes(uri).mode ~= 'directory' then io.open_file(utf8_uri) end
    end
  end
end)
connect(events.APPLEEVENT_ODOC,
  function(uri) return events.emit(events.URI_DROPPED, 'file://'..uri) end)

local string_format = string.format
local EOLs = { L('CRLF'), L('CR'), L('LF') }
local GETLEXERLANGUAGE = _SCINTILLA.functions.get_lexer_language[1]
-- Sets docstatusbar text.
connect(events.UPDATE_UI, function()
  local buffer = buffer
  local pos = buffer.current_pos
  local line, max = buffer:line_from_position(pos) + 1, buffer.line_count
  local col = buffer.column[pos] + 1
  local lexer = buffer:private_lexer_call(GETLEXERLANGUAGE)
  local eol = EOLs[buffer.eol_mode + 1]
  local tabs = string_format('%s %d', buffer.use_tabs and L('Tabs:') or
                             L('Spaces:'), buffer.indent)
  local enc = buffer.encoding or ''
  gui.docstatusbar_text =
    string_format('%s %d/%d    %s %d    %s    %s    %s    %s', L('Line:'), line,
                  max, L('Col:'), col, lexer, eol, tabs, enc)
end)

-- Toggles folding.
connect(events.MARGIN_CLICK, function(margin, pos, modifiers)
  if margin == 2 then buffer:toggle_fold(buffer:line_from_position(pos)) end
end)

connect(events.BUFFER_NEW, function() set_title(buffer) end)

-- Save buffer properties.
connect(events.BUFFER_BEFORE_SWITCH, function()
  local buffer = buffer
  -- Save view state.
  buffer._anchor = buffer.anchor
  buffer._current_pos = buffer.current_pos
  buffer._first_visible_line = buffer.first_visible_line
  -- Save fold state.
  buffer._folds = {}
  local folds = buffer._folds
  local i = buffer:contracted_fold_next(0)
  while i >= 0 do
    folds[#folds + 1] = i
    i = buffer:contracted_fold_next(i + 1)
  end
end)

-- Restore buffer properties.
connect(events.BUFFER_AFTER_SWITCH, function()
  local buffer = buffer
  if not buffer._folds then return end
  -- Restore fold state.
  for _, i in ipairs(buffer._folds) do buffer:toggle_fold(i) end
  -- Restore view state.
  buffer:set_sel(buffer._anchor, buffer._current_pos)
  buffer:line_scroll(0,
                     buffer:visible_from_doc_line(buffer._first_visible_line) -
                     buffer.first_visible_line)
end)

-- Updates titlebar and statusbar.
connect(events.BUFFER_AFTER_SWITCH, function()
  set_title(buffer)
  events.emit(events.UPDATE_UI)
end)

-- Updates titlebar and statusbar.
connect(events.VIEW_AFTER_SWITCH, function()
  set_title(buffer)
  events.emit(events.UPDATE_UI)
end)

connect(events.RESET_AFTER, function() gui.statusbar_text = 'Lua reset' end)

-- Prompts for confirmation if any buffers are dirty.
connect(events.QUIT, function()
  local list = {}
  for _, buffer in ipairs(_BUFFERS) do
    if buffer.dirty then
      list[#list + 1] = buffer.filename or buffer._type or L('Untitled')
    end
  end
  if #list > 0 and
     gui.dialog('msgbox',
                '--title', L('Quit without saving?'),
                '--text', L('The following buffers are unsaved:'),
                '--informative-text',
                string.format('%s', table.concat(list, '\n')),
                '--button1', 'gtk-cancel',
                '--button2', L('Quit _without saving'),
                '--no-newline') ~= '2' then
    return false
  end
  return true
end)

connect(events.ERROR, function(...) gui._print(L('[Error Buffer]'), ...) end)