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-- Copyright 2007-2011 Mitchell mitchell<att>caladbolg.net. See LICENSE.
local L = locale.localize
local events = events
---
-- Handles file-specific settings.
module('_m.textadept.mime_types', package.seeall)
-- Markdown:
-- ## Overview
--
-- This module adds an extra function to `buffer`:
--
-- * **buffer:set\_lexer** (language)<br />
-- Replacement for [`buffer:set_lexer_language()`][buffer_set_lexer_language].
-- <br /> Sets a buffer._lexer field so it can be restored without querying
-- the mime-types tables. Also if the user manually sets the lexer, it should
-- be restored.<br />
-- Loads the language-specific module if it exists.
-- - lang: The string language to set.
--
-- [buffer_set_lexer_language]: buffer.html#buffer:set_lexer_language
--
-- ## Mime-type Events
--
-- * `_G.events.LANGUAGE_MODULE_LOADED`: Called when loading a language-specific
-- module. This is useful for overriding its key commands since they are not
-- available when Textadept starts. Arguments:<br />
-- * `lang`: The language lexer name.
-- Events.
events.LANGUAGE_MODULE_LOADED = 'language_module_loaded'
---
-- File extensions with their associated lexers.
-- @class table
-- @name extensions
extensions = {}
---
-- Shebang words and their associated lexers.
-- @class table
-- @name shebangs
shebangs = {}
---
-- First-line patterns and their associated lexers.
-- @class table
-- @name patterns
patterns = {}
-- Load mime-types from mime_types.conf
local mime_types
local f = io.open(_HOME..'/modules/textadept/mime_types.conf', 'rb')
if f then
mime_types = f:read('*all')
f:close()
end
f = io.open(_USERHOME..'/mime_types.conf', 'rb')
if f then
mime_types = mime_types..'\n'..f:read('*all')
f:close()
end
for line in mime_types:gmatch('[^\r\n]+') do
if not line:find('^%s*%%') then
if line:find('^%s*[^#/]') then -- extension definition
local ext, lexer_name = line:match('^%s*(.+)%s+(%S+)$')
if ext and lexer_name then extensions[ext] = lexer_name end
else -- shebang or pattern
local ch, text, lexer_name = line:match('^%s*([#/])(.+)%s+(%S+)$')
if ch and text and lexer_name then
(ch == '#' and shebangs or patterns)[text] = lexer_name
end
end
end
end
---
-- List of detected lexers.
-- Lexers are read from `lexers/` and `~/.textadept/lexers/`.
-- @class table
-- @name lexers
lexers = {}
-- Generate lexer list
local lexers_found = {}
for lexer in lfs.dir(_HOME..'/lexers') do
if lexer:find('%.lua$') and lexer ~= 'lexer.lua' then
lexers_found[lexer:match('^(.+)%.lua$')] = true
end
end
if lfs.attributes(_USERHOME..'/lexers') then
for lexer in lfs.dir(_USERHOME..'/lexers') do
if lexer:find('%.lua$') and lexer ~= 'lexer.lua' then
lexers_found[lexer:match('^(.+)%.lua$')] = true
end
end
end
for lexer in pairs(lexers_found) do lexers[#lexers + 1] = lexer end
table.sort(lexers)
-- LuaDoc is in core/.buffer.luadoc.
local function get_style_name(buffer, style_num)
buffer:check_global()
if style_num < 0 or style_num > 255 then error('0 <= style_num < 256') end
return buffer:private_lexer_call(style_num)
end
-- Contains the whitespace styles for lexers.
-- These whitespace styles are used to determine the lexer at the current caret
-- position since the styles have the name '[lang]_whitespace'.
-- @class table
-- @name ws_styles
local ws_styles = {}
local SETDIRECTPOINTER = _SCINTILLA.properties.doc_pointer[2]
local SETLEXERLANGUAGE = _SCINTILLA.functions.set_lexer_language[1]
-- LuaDoc is in core/.buffer.luadoc.
local function set_lexer(buffer, lang)
buffer:check_global()
buffer._lexer = lang
buffer:private_lexer_call(SETDIRECTPOINTER, buffer.direct_pointer)
buffer:private_lexer_call(SETLEXERLANGUAGE, lang)
local ok, err = pcall(require, lang)
if ok then
ok, err = pcall(require, lang..'.post_init')
_m[lang].set_buffer_properties()
events.emit(events.LANGUAGE_MODULE_LOADED, lang)
end
local module_not_found = "^module '"..lang.."[^\']*' not found:"
if not ok and not err:find(module_not_found) then error(err) end
buffer:colourise(0, -1)
if ws_styles[lang] then return end
-- Create the ws_styles[lexer] lookup table for get_lexer().
local ws = {}
for i = 0, 255 do
ws[i] = buffer:private_lexer_call(i):find('whitespace') ~= nil
end
ws_styles[lang] = ws
end
local GETLEXERLANGUAGE = _SCINTILLA.functions.get_lexer_language[1]
-- LuaDoc is in core/.buffer.luadoc.
local function get_lexer(buffer, current)
buffer:check_global()
local lexer = buffer:private_lexer_call(GETLEXERLANGUAGE)
if not current then return lexer end
local i, ws, style_at = buffer.current_pos, ws_styles[lexer], buffer.style_at
if ws then while i > 0 and not ws[style_at[i]] do i = i - 1 end end
return get_style_name(buffer, style_at[i]):match('^(.+)_whitespace$') or lexer
end
events.connect(events.BUFFER_NEW, function()
buffer.set_lexer, buffer.get_lexer = set_lexer, get_lexer
buffer.get_style_name = get_style_name
end, 1)
-- Scintilla's first buffer does not have these.
if not RESETTING then
buffer.set_lexer, buffer.get_lexer = set_lexer, get_lexer
buffer.get_style_name = get_style_name
end
-- Performs actions suitable for a new buffer.
-- Sets the buffer's lexer language and loads the language module.
local function handle_new()
local lexer
local line = buffer:get_line(0)
if line:find('^#!') then
for word in line:gsub('[/\\]', ' '):gmatch('%S+') do
lexer = shebangs[word]
if lexer then break end
end
end
if not lexer then
for patt, lex in pairs(patterns) do
if line:find(patt) then lexer = lex break end
end
end
if not lexer and buffer.filename then
lexer = extensions[buffer.filename:match('[^/\\.]+$')]
end
buffer:set_lexer(lexer or 'container')
end
events.connect(events.FILE_OPENED, handle_new)
events.connect(events.FILE_SAVED_AS, handle_new)
-- Sets the buffer's lexer based on filename, shebang words, or
-- first line pattern.
local function restore_lexer()
buffer:private_lexer_call(SETDIRECTPOINTER, buffer.direct_pointer)
buffer:private_lexer_call(SETLEXERLANGUAGE, buffer._lexer or 'container')
end
events.connect(events.BUFFER_AFTER_SWITCH, restore_lexer)
events.connect(events.VIEW_NEW, restore_lexer, 1)
events.connect(events.RESET_AFTER,
function() buffer:set_lexer(buffer._lexer or 'container') end)
---
-- Prompts the user to select a lexer from a filtered list for the current
-- buffer.
function select_lexer()
local lexer = gui.filteredlist(L('Select Lexer'), 'Name', lexers)
if lexer then buffer:set_lexer(lexer) end
end
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