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-- Copyright 2007-2015 Mitchell mitchell.att.foicica.com. See LICENSE.
local M = {}
--[[ This comment is for LuaDoc.
---
-- Session support for Textadept.
-- @field DEFAULT_SESSION (string)
-- The path to the default session file, *`_USERHOME`/session*, or
-- *`_USERHOME`/session_term* if [`CURSES`]() is `true`.
-- @field SAVE_ON_QUIT (bool)
-- Save the session when quitting.
-- The session file saved is always `textadept.session.DEFAULT_SESSION`, even
-- if a different session was loaded with [`textadept.session.load()`]().
-- The default value is `true` unless the user passed the command line switch
-- `-n` or `--nosession` to Textadept.
-- @field MAX_RECENT_FILES (number)
-- The maximum number of recent files to save in session files.
-- Recent files are stored in [`io.recent_files`]().
-- The default value is `10`.
module('textadept.session')]]
M.DEFAULT_SESSION = _USERHOME..(not CURSES and '/session' or '/session_term')
M.SAVE_ON_QUIT = true
M.MAX_RECENT_FILES = 10
---
-- Loads session file *filename* or the user-selected session, returning `true`
-- if a session file was opened and read.
-- Textadept restores split views, opened buffers, cursor information, and
-- recent files.
-- @param filename Optional absolute path to the session file to load. If `nil`,
-- the user is prompted for one.
-- @return `true` if the session file was opened and read; `false` otherwise.
-- @usage textadept.session.load(filename)
-- @see DEFAULT_SESSION
-- @name load
function M.load(filename)
local dir, name = M.DEFAULT_SESSION:match('^(.-[/\\]?)([^/\\]+)$')
filename = filename or ui.dialogs.fileselect{
title = _L['Load Session'], with_directory = dir, with_file = name
}
if not filename then return end
local not_found = {}
local f = io.open(filename, 'rb')
if not f then io.close_all_buffers() return false end
local current_view, splits = 1, {[0] = {}}
local lfs_attributes = lfs.attributes
for line in f:lines() do
if line:find('^buffer:') then
local patt = '^buffer: (%d+) (%d+) (%d+) (.+)$'
local anchor, current_pos, first_visible_line, file = line:match(patt)
if not file:find('^%[.+%]$') then
if lfs_attributes(file) then
io.open_file(file)
else
not_found[#not_found + 1] = file
end
else
buffer.new()._type = file
events.emit(events.FILE_OPENED, file)
end
-- Restore saved buffer selection and view.
anchor, current_pos = tonumber(anchor) or 0, tonumber(current_pos) or 0
first_visible_line = tonumber(first_visible_line) or 0
buffer._anchor, buffer._current_pos = anchor, current_pos
buffer._first_visible_line = first_visible_line
buffer:line_scroll(0, buffer:visible_from_doc_line(first_visible_line))
buffer:set_sel(anchor, current_pos)
elseif line:find('^%s*split%d:') then
local level, num, type, size = line:match('^(%s*)split(%d): (%S+) (%d+)')
local view = splits[#level] and splits[#level][tonumber(num)] or view
splits[#level + 1] = {view:split(type == 'true')}
splits[#level + 1][1].size = tonumber(size) -- could be 1 or 2
elseif line:find('^%s*view%d:') then
local level, num, buf_idx = line:match('^(%s*)view(%d): (%d+)$')
local view = splits[#level][tonumber(num)] or view
buf_idx = tonumber(buf_idx)
if buf_idx > #_BUFFERS then buf_idx = #_BUFFERS end
view:goto_buffer(buf_idx)
elseif line:find('^current_view:') then
current_view = tonumber(line:match('^current_view: (%d+)')) or 1
elseif line:find('^size:') then
local maximized, width, height = line:match('^size: (%l*) ?(%d+) (%d+)$')
ui.maximized = maximized == 'true'
if not ui.maximized then ui.size = {width, height} end
elseif line:find('^recent:') then
local file = line:match('^recent: (.+)$')
local recent, exists = io.recent_files, false
for i = 1, #recent do
if file == recent[i] then exists = true break end
end
if not exists then recent[#recent + 1] = file end
end
end
f:close()
ui.goto_view(current_view)
if #not_found > 0 then
ui.dialogs.msgbox{
title = _L['Session Files Not Found'],
text = _L['The following session files were not found'],
informative_text = table.concat(not_found, '\n'),
icon = 'gtk-dialog-warning'
}
end
return true
end
-- Load session when no args are present.
events.connect(events.ARG_NONE, function()
if M.SAVE_ON_QUIT then M.load(M.DEFAULT_SESSION) end
end)
---
-- Saves the session to file *filename* or the user-selected file.
-- Saves split views, opened buffers, cursor information, and recent files.
-- @param filename Optional absolute path to the session file to save. If `nil`,
-- the user is prompted for one.
-- @usage textadept.session.save(filename)
-- @see DEFAULT_SESSION
-- @name save
function M.save(filename)
local dir, name = M.DEFAULT_SESSION:match('^(.-[/\\]?)([^/\\]+)$')
filename = filename or ui.dialogs.filesave{
title = _L['Save Session'], with_directory = dir,
with_file = name:iconv('UTF-8', _CHARSET)
}
if not filename then return end
local session = {}
local buffer_line = "buffer: %d %d %d %s" -- anchor, cursor, line, filename
local split_line = "%ssplit%d: %s %d" -- level, number, type, size
local view_line = "%sview%d: %d" -- level, number, doc index
-- Write out opened buffers.
for _, buffer in ipairs(_BUFFERS) do
local file = buffer.filename or buffer._type
if file then
local current = buffer == view.buffer
local anchor = current and 'anchor' or '_anchor'
local current_pos = current and 'current_pos' or '_current_pos'
local top_line = current and 'first_visible_line' or '_first_visible_line'
session[#session + 1] = buffer_line:format(buffer[anchor] or 0,
buffer[current_pos] or 0,
buffer[top_line] or 0, file)
end
end
-- Write out split views.
local function write_split(split, level, number)
local c1, c2 = split[1], split[2]
local vertical, size = tostring(split.vertical), split.size
local spaces = (' '):rep(level)
session[#session + 1] = split_line:format(spaces, number, vertical, size)
spaces = (' '):rep(level + 1)
if c1[1] and c1[2] then
write_split(c1, level + 1, 1)
else
session[#session + 1] = view_line:format(spaces, 1, _BUFFERS[c1.buffer])
end
if c2[1] and c2[2] then
write_split(c2, level + 1, 2)
else
session[#session + 1] = view_line:format(spaces, 2, _BUFFERS[c2.buffer])
end
end
local splits = ui.get_split_table()
if splits[1] and splits[2] then
write_split(splits, 0, 0)
else
session[#session + 1] = view_line:format('', 1, _BUFFERS[splits.buffer])
end
-- Write out the current focused view.
session[#session + 1] = ("current_view: %d"):format(_VIEWS[view])
-- Write out other things.
local maximized, size = tostring(ui.maximized), ui.size
session[#session + 1] = ("size: %s %d %d"):format(maximized, size[1], size[2])
for i = 1, #io.recent_files do
if i > M.MAX_RECENT_FILES then break end
session[#session + 1] = ("recent: %s"):format(io.recent_files[i])
end
-- Write the session.
local f = io.open(filename, 'wb')
if f then
f:write(table.concat(session, '\n'))
f:close()
end
end
-- Saves session on quit.
events.connect(events.QUIT, function()
if M.SAVE_ON_QUIT then M.save(M.DEFAULT_SESSION) end
end, 1)
-- Does not save session on quit.
args.register('-n', '--nosession', 0,
function() M.SAVE_ON_QUIT = false end, 'No session functionality')
-- Loads the given session on startup.
args.register('-s', '--session', 1, function(name)
if lfs.attributes(name) then M.load(name) return end
M.load(_USERHOME..'/'..name)
end, 'Load session')
return M
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