---------------------------------------------------------------------------
--- Prompt module for awful.
--
-- **Keyboard navigation**:
--
-- The following readline keyboard shortcuts are implemented as expected:
--
--
-- The following shortcuts implement additional history manipulation commands
-- where the search term is defined as the substring of the command from first
-- character to cursor position.
--
-- * CTRL+R: reverse history search, matches any history entry
-- containing search term.
-- * CTRL+S: forward history search, matches any history entry
-- containing search term.
-- * CTRL+UP: ZSH up line or search, matches any history entry
-- starting with search term.
-- * CTRL+DOWN: ZSH down line or search, matches any history
-- entry starting with search term.
-- * CTRL+DELETE: delete the currently visible history entry from
-- history file. This does not delete new commands or history entries under
-- user editing.
--
-- **Basic usage**:
--
-- By default, `rc.lua` will create one `awful.widget.prompt` per screen called
-- `mypromptbox`. It is used for both the command execution (`mod4+r`) and
-- Lua prompt (`mod4+x`). It can be re-used for random inputs using:
--
-- @DOC_wibox_awidget_prompt_simple_EXAMPLE@
--
-- -- Then **IN THE globalkeys TABLE** add a new shortcut
-- awful.key({ modkey }, "e", echo_test,
-- {description = "Echo a string", group = "custom"}),
--
-- Note that this assumes an `rc.lua` file based on the default one. The way
-- to access the screen prompt may vary.
--
-- **Extra key hooks**:
--
-- The Awesome prompt also supports adding custom extensions to specific
-- keyboard keybindings. Those keybindings have precedence over the built-in
-- ones. Therefor, they can be used to override the default ones.
--
-- *[Example one] Adding pre-configured `awful.spawn` commands:*
--
-- @DOC_wibox_awidget_prompt_hooks_EXAMPLE@
--
-- *[Example two] Modifying the command (+ vi like input)*:
--
-- The hook system also allows to modify the command before interpreting it in
-- the `exe_callback`.
--
-- @DOC_wibox_awidget_prompt_vilike_EXAMPLE@
--
-- *[Example three] Key listener*:
--
-- The 2 previous examples were focused on changing the prompt behavior. This
-- one explains how to "spy" on the prompt events. This can be used for
--
-- * Implementing more complex mutator
-- * Synchronising other widgets
-- * Showing extra tips to the user
--
-- @DOC_wibox_awidget_prompt_keypress_EXAMPLE@
--
-- **highlighting**:
--
-- The prompt also support custom highlighters:
--
-- @DOC_wibox_awidget_prompt_highlight_EXAMPLE@
--
-- @author Julien Danjou <julien@danjou.info>
-- @copyright 2008 Julien Danjou
-- @module awful.prompt
---------------------------------------------------------------------------
--- The prompt cursor foreground color.
-- @beautiful beautiful.prompt_fg_cursor
-- @param color
-- @see gears.color
--- The prompt cursor background color.
-- @beautiful beautiful.prompt_bg_cursor
-- @param color
-- @see gears.color
--- The prompt text font.
-- @beautiful beautiful.prompt_font
-- @param string
-- @see string
-- Grab environment we need
local io = io
local table = table
local math = math
local ipairs = ipairs
local pcall = pcall
local capi =
{
selection = selection
}
local unpack = unpack or table.unpack -- luacheck: globals unpack (compatibility with Lua 5.1)
local keygrabber = require("awful.keygrabber")
local beautiful = require("beautiful")
local akey = require("awful.key")
local gdebug = require('gears.debug')
local gtable = require("gears.table")
local gcolor = require("gears.color")
local gstring = require("gears.string")
local gfs = require("gears.filesystem")
local prompt = {}
--- Private data
local data = {}
data.history = {}
local search_term = nil
local function itera (inc,a, i)
i = i + inc
local v = a[i]
if v then return i,v end
end
--- Load history file in history table
-- @param id The data.history identifier which is the path to the filename.
-- @param[opt] max The maximum number of entries in file.
local function history_check_load(id, max)
if id and id ~= "" and not data.history[id] then
data.history[id] = { max = 50, table = {} }
if max then
data.history[id].max = max
end
local f = io.open(id, "r")
if not f then return end
-- Read history file
for line in f:lines() do
if gtable.hasitem(data.history[id].table, line) == nil then
table.insert(data.history[id].table, line)
if #data.history[id].table >= data.history[id].max then
break
end
end
end
f:close()
end
end
local function is_word_char(c)
if string.find(c, "[{[(,.:;_-+=@/ ]") then
return false
else
return true
end
end
local function cword_start(s, pos)
local i = pos
if i > 1 then
i = i - 1
end
while i >= 1 and not is_word_char(s:sub(i, i)) do
i = i - 1
end
while i >= 1 and is_word_char(s:sub(i, i)) do
i = i - 1
end
if i <= #s then
i = i + 1
end
return i
end
local function cword_end(s, pos)
local i = pos
while i <= #s and not is_word_char(s:sub(i, i)) do
i = i + 1
end
while i <= #s and is_word_char(s:sub(i, i)) do
i = i + 1
end
return i
end
--- Save history table in history file
-- @param id The data.history identifier
local function history_save(id)
if data.history[id] then
gfs.make_parent_directories(id)
local f = io.open(id, "w")
if not f then
gdebug.print_warning("Failed to write the history to "..id)
return
end
for i = 1, math.min(#data.history[id].table, data.history[id].max) do
f:write(data.history[id].table[i] .. "\n")
end
f:close()
end
end
--- Return the number of items in history table regarding the id
-- @param id The data.history identifier
-- @return the number of items in history table, -1 if history is disabled
local function history_items(id)
if data.history[id] then
return #data.history[id].table
else
return -1
end
end
--- Add an entry to the history file
-- @param id The data.history identifier
-- @param command The command to add
local function history_add(id, command)
if data.history[id] and command ~= "" then
local index = gtable.hasitem(data.history[id].table, command)
if index == nil then
table.insert(data.history[id].table, command)
-- Do not exceed our max_cmd
if #data.history[id].table > data.history[id].max then
table.remove(data.history[id].table, 1)
end
history_save(id)
else
-- Bump this command to the end of history
table.remove(data.history[id].table, index)
table.insert(data.history[id].table, command)
history_save(id)
end
end
end
--- Draw the prompt text with a cursor.
-- @tparam table args The table of arguments.
-- @field text The text.
-- @field font The font.
-- @field prompt The text prefix.
-- @field text_color The text color.
-- @field cursor_color The cursor color.
-- @field cursor_pos The cursor position.
-- @field cursor_ul The cursor underline style.
-- @field selectall If true cursor is rendered on the entire text.
local function prompt_text_with_cursor(args)
local char, spacer, text_start, text_end, ret
local text = args.text or ""
local _prompt = args.prompt or ""
local underline = args.cursor_ul or "none"
if args.selectall then
if #text == 0 then char = " " else char = gstring.xml_escape(text) end
spacer = " "
text_start = ""
text_end = ""
elseif #text < args.cursor_pos then
char = " "
spacer = ""
text_start = gstring.xml_escape(text)
text_end = ""
else
char = gstring.xml_escape(text:sub(args.cursor_pos, args.cursor_pos))
spacer = " "
text_start = gstring.xml_escape(text:sub(1, args.cursor_pos - 1))
text_end = gstring.xml_escape(text:sub(args.cursor_pos + 1))
end
local cursor_color = gcolor.ensure_pango_color(args.cursor_color)
local text_color = gcolor.ensure_pango_color(args.text_color)
if args.highlighter then
text_start, text_end = args.highlighter(text_start, text_end)
end
ret = _prompt .. text_start .. "" .. char .. "" .. text_end .. spacer
return ret
end
--- The callback function to call with command as argument when finished.
-- @usage local function my_exe_cb(command)
-- -- do something
-- end
-- @callback exe_callback
-- @tparam string command The command (as entered).
--- The callback function to get completions.
-- @usage local function my_completion_cb(command_before_comp, cur_pos_before_comp, ncomp)
-- return command_before_comp.."foo", cur_pos_before_comp+3, 1
-- end
--
-- @callback completion_callback
-- @tparam string command_before_comp The current command.
-- @tparam number cur_pos_before_comp The current cursor position.
-- @tparam number ncomp The number of the currently completed element.
-- @treturn string command
-- @treturn number cur_pos
-- @treturn number matches
--- The callback function to always call without arguments, regardless of
-- whether the prompt was cancelled.
-- @usage local function my_done_cb()
-- -- do something
-- end
-- @callback done_callback
--- The callback function to call with command as argument when a command was
-- changed.
-- @usage local function my_changed_cb(command)
-- -- do something
-- end
-- @callback changed_callback
-- @tparam string command The current command.
--- The callback function to call with mod table, key and command as arguments
-- when a key was pressed.
-- @usage local function my_keypressed_cb(mod, key, command)
-- -- do something
-- end
-- @callback keypressed_callback
-- @tparam table mod The current modifiers (like "Control" or "Shift").
-- @tparam string key The key name.
-- @tparam string command The current command.
--- The callback function to call with mod table, key and command as arguments
-- when a key was released.
-- @usage local function my_keyreleased_cb(mod, key, command)
-- -- do something
-- end
-- @callback keyreleased_callback
-- @tparam table mod The current modifiers (like "Control" or "Shift").
-- @tparam string key The key name.
-- @tparam string command The current command.
--- A function to add syntax highlighting to the command.
-- @usage local function my_highlighter(before_cursor, after_cursor)
-- -- do something
-- return before_cursor, after_cursor
-- end
-- @callback highlighter
-- @tparam string before_cursor
-- @tparam string after_cursor
--- A callback when a key combination is triggered.
-- This callback can return many things:
--
-- * a modified command
-- * `true` If the command is successful (then it won't exit)
-- * nothing or `nil` to execute the `exe_callback` and `done_callback` and exit
--
-- An optional second return value controls if the prompt should exit or simply
-- update the command (from the first return value) and keep going. The default
-- is to execute the `exe_callback` and `done_callback` before exiting.
--
-- @usage local function my_hook(command)
-- return command.."foo", false
-- end
--
-- @callback hook
-- @tparam string command The current command.
--- Run a prompt in a box.
--
-- @tparam[opt={}] table args A table with optional arguments
-- @tparam[opt] gears.color args.fg_cursor
-- @tparam[opt] gears.color args.bg_cursor
-- @tparam[opt] gears.color args.ul_cursor
-- @tparam[opt] widget args.prompt
-- @tparam[opt] string args.text
-- @tparam[opt] boolean args.selectall
-- @tparam[opt] string args.font
-- @tparam[opt] boolean args.autoexec
-- @tparam widget args.textbox The textbox to use for the prompt.
-- @tparam[opt] function args.highlighter A function to add syntax highlighting to
-- the command.
-- @tparam function args.exe_callback The callback function to call with command as argument
-- when finished.
-- @tparam function args.completion_callback The callback function to call to get completion.
-- @tparam[opt] string args.history_path File path where the history should be
-- saved, set nil to disable history
-- @tparam[opt] function args.history_max Set the maximum entries in history
-- file, 50 by default
-- @tparam[opt] function args.done_callback The callback function to always call
-- without arguments, regardless of whether the prompt was cancelled.
-- @tparam[opt] function args.changed_callback The callback function to call
-- with command as argument when a command was changed.
-- @tparam[opt] function args.keypressed_callback The callback function to call
-- with mod table, key and command as arguments when a key was pressed.
-- @tparam[opt] function args.keyreleased_callback The callback function to call
-- with mod table, key and command as arguments when a key was pressed.
-- @tparam[opt] table args.hooks The "hooks" argument uses a syntax similar to
-- `awful.key`. It will call a function for the matching modifiers + key.
-- It receives the command (widget text/input) as an argument.
-- If the callback returns a command, this will be passed to the
-- `exe_callback`, otherwise nothing gets executed by default, and the hook
-- needs to handle it.
-- hooks = {
-- -- Apply startup notification properties with Shift-Return.
-- {{"Shift" }, "Return", function(command)
-- awful.screen.focused().mypromptbox:spawn_and_handle_error(
-- command, {floating=true})
-- end},
-- -- Override default behavior of "Return": launch commands prefixed
-- -- with ":" in a terminal.
-- {{}, "Return", function(command)
-- if command:sub(1,1) == ":" then
-- return terminal .. ' -e ' .. command:sub(2)
-- end
-- return command
-- end}
-- }
-- @param textbox The textbox to use for the prompt. [**DEPRECATED**]
-- @param exe_callback The callback function to call with command as argument
-- when finished. [**DEPRECATED**]
-- @param completion_callback The callback function to call to get completion.
-- [**DEPRECATED**]
-- @param[opt] history_path File path where the history should be
-- saved, set nil to disable history [**DEPRECATED**]
-- @param[opt] history_max Set the maximum entries in history
-- file, 50 by default [**DEPRECATED**]
-- @param[opt] done_callback The callback function to always call
-- without arguments, regardless of whether the prompt was cancelled.
-- [**DEPRECATED**]
-- @param[opt] changed_callback The callback function to call
-- with command as argument when a command was changed. [**DEPRECATED**]
-- @param[opt] keypressed_callback The callback function to call
-- with mod table, key and command as arguments when a key was pressed.
-- [**DEPRECATED**]
-- @see gears.color
-- @staticfct awful.prompt.run
function prompt.run(args, textbox, exe_callback, completion_callback,
history_path, history_max, done_callback,
changed_callback, keypressed_callback)
local grabber
local theme = beautiful.get()
if not args then args = {} end
local command = args.text or ""
local command_before_comp
local cur_pos_before_comp
local prettyprompt = args.prompt or ""
local inv_col = args.fg_cursor or theme.prompt_fg_cursor or theme.fg_focus or "black"
local cur_col = args.bg_cursor or theme.prompt_bg_cursor or theme.bg_focus or "white"
local cur_ul = args.ul_cursor
local text = args.text or ""
local font = args.font or theme.prompt_font or theme.font
local selectall = args.selectall
local highlighter = args.highlighter
local hooks = {}
local deprecated = function(name)
gdebug.deprecate(string.format(
'awful.prompt.run: the argument %s is deprecated, please use args.%s instead',
name, name), {raw=true, deprecated_in=4})
end
if textbox then deprecated('textbox') end
if exe_callback then deprecated('exe_callback') end
if completion_callback then deprecated('completion_callback') end
if history_path then deprecated('history_path') end
if history_max then deprecated('history_max') end
if done_callback then deprecated('done_callback') end
if changed_callback then deprecated('changed_callback') end
if keypressed_callback then deprecated('keypressed_callback') end
-- This function has already an absurd number of parameters, allow them
-- to be set using the args to avoid a "nil, nil, nil, nil, foo" scenario
keypressed_callback = keypressed_callback or args.keypressed_callback
changed_callback = changed_callback or args.changed_callback
done_callback = done_callback or args.done_callback
history_max = history_max or args.history_max
history_path = history_path or args.history_path
completion_callback = completion_callback or args.completion_callback
exe_callback = exe_callback or args.exe_callback
textbox = textbox or args.textbox
if not textbox then
return
end
search_term=nil
history_check_load(history_path, history_max)
local history_index = history_items(history_path) + 1
-- The cursor position
local cur_pos = (selectall and 1) or text:wlen() + 1
-- The completion element to use on completion request.
local ncomp = 1
-- Build the hook map
for _,v in ipairs(args.hooks or {}) do
if #v == 3 then
local _,key,callback = unpack(v)
if type(callback) == "function" then
hooks[key] = hooks[key] or {}
hooks[key][#hooks[key]+1] = v
else
gdebug.print_warning("The hook's 3rd parameter has to be a function.")
end
else
gdebug.print_warning("The hook has to have 3 parameters.")
end
end
textbox:set_font(font)
textbox:set_markup(prompt_text_with_cursor{
text = text, text_color = inv_col, cursor_color = cur_col,
cursor_pos = cur_pos, cursor_ul = cur_ul, selectall = selectall,
prompt = prettyprompt, highlighter = highlighter})
local function exec(cb, command_to_history)
textbox:set_markup("")
history_add(history_path, command_to_history)
keygrabber.stop(grabber)
if cb then cb(command) end
if done_callback then done_callback() end
end
-- Update textbox
local function update()
textbox:set_font(font)
textbox:set_markup(prompt_text_with_cursor{
text = command, text_color = inv_col, cursor_color = cur_col,
cursor_pos = cur_pos, cursor_ul = cur_ul, selectall = selectall,
prompt = prettyprompt, highlighter = highlighter })
end
grabber = keygrabber.run(
function (modifiers, key, event)
-- Convert index array to hash table
local mod = {}
for _, v in ipairs(modifiers) do mod[v] = true end
if event ~= "press" then
if args.keyreleased_callback then
args.keyreleased_callback(mod, key, command)
end
return
end
-- Call the user specified callback. If it returns true as
-- the first result then return from the function. Treat the
-- second and third results as a new command and new prompt
-- to be set (if provided)
if keypressed_callback then
local user_catched, new_command, new_prompt =
keypressed_callback(mod, key, command)
if new_command or new_prompt then
if new_command then
command = new_command
end
if new_prompt then
prettyprompt = new_prompt
end
update()
end
if user_catched then
if changed_callback then
changed_callback(command)
end
return
end
end
local filtered_modifiers = {}
-- User defined cases
if hooks[key] then
-- Remove caps and num lock
for _, m in ipairs(modifiers) do
if not gtable.hasitem(akey.ignore_modifiers, m) then
table.insert(filtered_modifiers, m)
end
end
for _,v in ipairs(hooks[key]) do
if #filtered_modifiers == #v[1] then
local match = true
for _,v2 in ipairs(v[1]) do
match = match and mod[v2]
end
if match then
local cb
local ret, quit = v[3](command)
local original_command = command
-- Support both a "simple" and a "complex" way to
-- control if the prompt should quit.
quit = quit == nil and (ret ~= true) or (quit~=false)
-- Allow the callback to change the command
command = (ret ~= true) and ret or command
-- Quit by default, but allow it to be disabled
if ret and type(ret) ~= "boolean" then
cb = exe_callback
if not quit then
cur_pos = ret:wlen() + 1
update()
end
elseif quit then
-- No callback.
cb = function() end
end
-- Execute the callback
if cb then
exec(cb, original_command)
end
return
end
end
end
end
-- Get out cases
if (mod.Control and (key == "c" or key == "g"))
or (not mod.Control and key == "Escape") then
keygrabber.stop(grabber)
textbox:set_markup("")
history_save(history_path)
if done_callback then done_callback() end
return false
elseif (mod.Control and (key == "j" or key == "m"))
or (not mod.Control and key == "Return")
or (not mod.Control and key == "KP_Enter") then
exec(exe_callback, command)
-- We already unregistered ourselves so we don't want to return
-- true, otherwise we may unregister someone else.
return
end
-- Control cases
if mod.Control then
selectall = nil
if key == "a" then
cur_pos = 1
elseif key == "b" then
if cur_pos > 1 then
cur_pos = cur_pos - 1
end
elseif key == "d" then
if cur_pos <= #command then
command = command:sub(1, cur_pos - 1) .. command:sub(cur_pos + 1)
end
elseif key == "p" then
if history_index > 1 then
history_index = history_index - 1
command = data.history[history_path].table[history_index]
cur_pos = #command + 2
end
elseif key == "n" then
if history_index < history_items(history_path) then
history_index = history_index + 1
command = data.history[history_path].table[history_index]
cur_pos = #command + 2
elseif history_index == history_items(history_path) then
history_index = history_index + 1
command = ""
cur_pos = 1
end
elseif key == "e" then
cur_pos = #command + 1
elseif key == "r" then
search_term = search_term or command:sub(1, cur_pos - 1)
for i,v in (function(a,i) return itera(-1,a,i) end), data.history[history_path].table, history_index do
if v:find(search_term,1,true) ~= nil then
command=v
history_index=i
cur_pos=#command+1
break
end
end
elseif key == "s" then
search_term = search_term or command:sub(1, cur_pos - 1)
for i,v in (function(a,i) return itera(1,a,i) end), data.history[history_path].table, history_index do
if v:find(search_term,1,true) ~= nil then
command=v
history_index=i
cur_pos=#command+1
break
end
end
elseif key == "f" then
if cur_pos <= #command then
cur_pos = cur_pos + 1
end
elseif key == "h" then
if cur_pos > 1 then
command = command:sub(1, cur_pos - 2) .. command:sub(cur_pos)
cur_pos = cur_pos - 1
end
elseif key == "k" then
command = command:sub(1, cur_pos - 1)
elseif key == "u" then
command = command:sub(cur_pos, #command)
cur_pos = 1
elseif key == "Up" then
search_term = command:sub(1, cur_pos - 1) or ""
for i,v in (function(a,i) return itera(-1,a,i) end), data.history[history_path].table, history_index do
if v:find(search_term,1,true) == 1 then
command=v
history_index=i
break
end
end
elseif key == "Down" then
search_term = command:sub(1, cur_pos - 1) or ""
for i,v in (function(a,i) return itera(1,a,i) end), data.history[history_path].table, history_index do
if v:find(search_term,1,true) == 1 then
command=v
history_index=i
break
end
end
elseif key == "w" or key == "BackSpace" then
local wstart = 1
local wend = 1
local cword_start_pos = 1
local cword_end_pos = 1
while wend < cur_pos do
wend = command:find("[{[(,.:;_-+=@/ ]", wstart)
if not wend then wend = #command + 1 end
if cur_pos >= wstart and cur_pos <= wend + 1 then
cword_start_pos = wstart
cword_end_pos = cur_pos - 1
break
end
wstart = wend + 1
end
command = command:sub(1, cword_start_pos - 1) .. command:sub(cword_end_pos + 1)
cur_pos = cword_start_pos
elseif key == "Delete" then
-- delete from history only if:
-- we are not dealing with a new command
-- the user has not edited an existing entry
if command == data.history[history_path].table[history_index] then
table.remove(data.history[history_path].table, history_index)
if history_index <= history_items(history_path) then
command = data.history[history_path].table[history_index]
cur_pos = #command + 2
elseif history_index > 1 then
history_index = history_index - 1
command = data.history[history_path].table[history_index]
cur_pos = #command + 2
else
command = ""
cur_pos = 1
end
end
end
elseif mod.Mod1 or mod.Mod3 then
if key == "b" then
cur_pos = cword_start(command, cur_pos)
elseif key == "f" then
cur_pos = cword_end(command, cur_pos)
elseif key == "d" then
command = command:sub(1, cur_pos - 1) .. command:sub(cword_end(command, cur_pos))
elseif key == "BackSpace" then
local wstart = cword_start(command, cur_pos)
command = command:sub(1, wstart - 1) .. command:sub(cur_pos)
cur_pos = wstart
end
else
if completion_callback then
if key == "Tab" or key == "ISO_Left_Tab" then
if key == "ISO_Left_Tab" or mod.Shift then
if ncomp == 1 then return end
if ncomp == 2 then
command = command_before_comp
textbox:set_font(font)
textbox:set_markup(prompt_text_with_cursor{
text = command_before_comp, text_color = inv_col, cursor_color = cur_col,
cursor_pos = cur_pos, cursor_ul = cur_ul, selectall = selectall,
prompt = prettyprompt })
cur_pos = cur_pos_before_comp
ncomp = 1
return
end
ncomp = ncomp - 2
elseif ncomp == 1 then
command_before_comp = command
cur_pos_before_comp = cur_pos
end
local matches
command, cur_pos, matches = completion_callback(command_before_comp, cur_pos_before_comp, ncomp)
ncomp = ncomp + 1
key = ""
-- execute if only one match found and autoexec flag set
if matches and #matches == 1 and args.autoexec then
exec(exe_callback)
return
end
elseif key ~= "Shift_L" and key ~= "Shift_R" then
ncomp = 1
end
end
-- Typin cases
if mod.Shift and key == "Insert" then
local selection = capi.selection()
if selection then
-- Remove \n
local n = selection:find("\n")
if n then
selection = selection:sub(1, n - 1)
end
command = command:sub(1, cur_pos - 1) .. selection .. command:sub(cur_pos)
cur_pos = cur_pos + #selection
end
elseif key == "Home" then
cur_pos = 1
elseif key == "End" then
cur_pos = #command + 1
elseif key == "BackSpace" then
if cur_pos > 1 then
command = command:sub(1, cur_pos - 2) .. command:sub(cur_pos)
cur_pos = cur_pos - 1
end
elseif key == "Delete" then
command = command:sub(1, cur_pos - 1) .. command:sub(cur_pos + 1)
elseif key == "Left" then
cur_pos = cur_pos - 1
elseif key == "Right" then
cur_pos = cur_pos + 1
elseif key == "Up" then
if history_index > 1 then
history_index = history_index - 1
command = data.history[history_path].table[history_index]
cur_pos = #command + 2
end
elseif key == "Down" then
if history_index < history_items(history_path) then
history_index = history_index + 1
command = data.history[history_path].table[history_index]
cur_pos = #command + 2
elseif history_index == history_items(history_path) then
history_index = history_index + 1
command = ""
cur_pos = 1
end
else
-- wlen() is UTF-8 aware but #key is not,
-- so check that we have one UTF-8 char but advance the cursor of # position
if key:wlen() == 1 then
if selectall then command = "" end
command = command:sub(1, cur_pos - 1) .. key .. command:sub(cur_pos)
cur_pos = cur_pos + #key
end
end
if cur_pos < 1 then
cur_pos = 1
elseif cur_pos > #command + 1 then
cur_pos = #command + 1
end
selectall = nil
end
local success = pcall(update)
while not success do
-- TODO UGLY HACK TODO
-- Setting the text failed. Most likely reason is that the user
-- entered a multibyte character and pressed backspace which only
-- removed the last byte. Let's remove another byte.
if cur_pos <= 1 then
-- No text left?!
break
end
command = command:sub(1, cur_pos - 2) .. command:sub(cur_pos)
cur_pos = cur_pos - 1
success = pcall(update)
end
if changed_callback then
changed_callback(command)
end
end)
end
return prompt
-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80