Moved session support from core/file_io.lua to a Textadept module.

2 files changed, 157 insertions, 0 deletions

diff --git a/modules/textadept/init.lua b/modules/textadept/init.lua
index 535f0089..0d42cfd5 100644
--- a/modules/textadept/init.lua
+++ b/modules/textadept/init.lua
@@ -10,3 +10,4 @@ require 'textadept.editing'
 require 'textadept.lsnippets'
 require 'textadept.mlines'
 require 'textadept.run'
+require 'textadept.session'
diff --git a/modules/textadept/session.lua b/modules/textadept/session.lua
new file mode 100644
index 00000000..a464da68
--- /dev/null
+++ b/modules/textadept/session.lua
@@ -0,0 +1,156 @@
+-- Copyright 2007-2009 Mitchell mitchell<att>caladbolg.net. See LICENSE.
+
+local textadept = _G.textadept
+local locale = _G.locale
+
+---
+-- Session support for the textadept module.
+-- There are several option variables used:
+--   DEFAULT_SESSION: The path to the default session file.
+module('_m.textadept.session', package.seeall)
+
+local DEFAULT_SESSION = _USERHOME..'/session'
+
+---
+-- Loads a Textadept session file.
+-- Textadept restores split views, opened buffers, cursor information, and
+-- project manager details.
+-- @param filename The absolute path to the session file to load. Defaults to
+--   DEFAULT_SESSION if not specified.
+-- @param only_pm Flag indicating whether or not to load only the Project
+--   Manager session settings. Defaults to false.
+-- @return true if the session file was opened and read; false otherwise.
+-- @usage _m.textadept.session.load(filename)
+function load(filename, only_pm)
+  local f = io.open(filename or DEFAULT_SESSION, 'rb')
+  if not f then return false end
+  local current_view, splits = 1, { [0] = {} }
+  for line in f:lines() do
+    if not only_pm then
+      if line:find('^buffer:') then
+        local anchor, current_pos, first_visible_line, filename =
+          line:match('^buffer: (%d+) (%d+) (%d+) (.+)$')
+        if not filename:find('^%[.+%]$') then
+          textadept.io.open(filename or '')
+        else
+          textadept.new_buffer()
+          buffer._type = filename
+        end
+        -- Restore saved buffer selection and view.
+        local anchor = tonumber(anchor) or 0
+        local current_pos = tonumber(current_pos) or 0
+        local first_visible_line = tonumber(first_visible_line) or 0
+        local buffer = buffer
+        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+)$')
+        local view = splits[#level][tonumber(num)] or view
+        buf_idx = tonumber(buf_idx)
+        if buf_idx > #textadept.buffers then buf_idx = #textadept.buffers end
+        view:goto_buffer(buf_idx)
+      elseif line:find('^current_view:') then
+        local view_idx = line:match('^current_view: (%d+)')
+        current_view = tonumber(view_idx) or 1
+      end
+    end
+    if line:find('^size:') then
+      local width, height = line:match('^size: (%d+) (%d+)$')
+      if width and height then textadept.size = { width, height } end
+    elseif line:find('^pm:') then
+      local width, cursor, text = line:match('^pm: (%d+) ([%d:]+) (.+)$')
+      textadept.pm.width = width or 0
+      textadept.pm.entry_text = text or ''
+      textadept.pm.activate()
+      if cursor then textadept.pm.cursor = cursor end
+    end
+  end
+  f:close()
+  textadept.views[current_view]:focus()
+  textadept.session_file = filename or DEFAULT_SESSION
+  return true
+end
+
+---
+-- Saves a Textadept session to a file.
+-- Saves split views, opened buffers, cursor information, and project manager
+-- details.
+-- @param filename The absolute path to the session file to save. Defaults to
+--   either the current session file or DEFAULT_SESSION if not specified.
+-- @usage _m.textadept.session.save(filename)
+function save(filename)
+  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(textadept.buffers) do
+    local filename = buffer.filename or buffer._type
+    if filename then
+      local current = buffer.doc_pointer == textadept.focused_doc_pointer
+      local anchor = current and 'anchor' or '_anchor'
+      local current_pos = current and 'current_pos' or '_current_pos'
+      local first_visible_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[first_visible_line] or 0, filename)
+    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 type(c1) == 'table' then
+      write_split(c1, level + 1, 1)
+    else
+      session[#session + 1] = view_line:format(spaces, 1, c1)
+    end
+    if type(c2) == 'table' then
+      write_split(c2, level + 1, 2)
+    else
+      session[#session + 1] = view_line:format(spaces, 2, c2)
+    end
+  end
+  local splits = textadept.get_split_table()
+  if type(splits) == 'table' then
+    write_split(splits, 0, 0)
+  else
+    session[#session + 1] = view_line:format('', 1, splits)
+  end
+  -- Write out the current focused view.
+  local current_view = view
+  for index, view in ipairs(textadept.views) do
+    if view == current_view then
+      current_view = index
+      break
+    end
+  end
+  session[#session + 1] = ("current_view: %d"):format(current_view)
+  -- Write out other things.
+  local size = textadept.size
+  session[#session + 1] = ("size: %d %d"):format(size[1], size[2])
+  local pm = textadept.pm
+  session[#session + 1] =
+    ("pm: %d %s %s"):format(pm.width, pm.cursor or '0', pm.entry_text)
+  -- Write the session.
+  local f = io.open(filename or textadept.session_file or DEFAULT_SESSION, 'wb')
+  if f then
+    f:write(table.concat(session, '\n'))
+    f:close()
+  end
+end
+
+textadept.events.add_handler('quit', save, 1)