361 lines
12 KiB
Lua
361 lines
12 KiB
Lua
---------------------------------------------------------------------------
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--- Menubar module, which aims to provide a freedesktop menu alternative
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--
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-- List of menubar keybindings:
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-- ---
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--
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-- * "Left" | "C-j" select an item on the left
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-- * "Right" | "C-k" select an item on the right
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-- * "Backspace" exit the current category if we are in any
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-- * "Escape" exit the current directory or exit menubar
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-- * "Home" select the first item
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-- * "End" select the last
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-- * "Return" execute the entry
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-- * "C-Return" execute the command with awful.spawn
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-- * "C-M-Return" execute the command in a terminal
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--
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-- @author Alexander Yakushev <yakushev.alex@gmail.com>
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-- @copyright 2011-2012 Alexander Yakushev
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-- @release @AWESOME_VERSION@
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-- @module menubar
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---------------------------------------------------------------------------
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-- Grab environment we need
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local capi = {
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client = client,
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mouse = mouse,
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screen = screen
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}
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local awful = require("awful")
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local common = require("awful.widget.common")
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local theme = require("beautiful")
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local wibox = require("wibox")
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local function get_screen(s)
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return s and capi.screen[s]
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end
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-- menubar
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local menubar = { mt = {}, menu_entries = {} }
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menubar.menu_gen = require("menubar.menu_gen")
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menubar.utils = require("menubar.utils")
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local compute_text_width = menubar.utils.compute_text_width
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-- Options section
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--- When true the .desktop files will be reparsed only when the
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-- extension is initialized. Use this if menubar takes much time to
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-- open.
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menubar.cache_entries = true
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--- When true the categories will be shown alongside application
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-- entries.
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menubar.show_categories = true
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--- Specifies the geometry of the menubar. This is a table with the keys
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-- x, y, width and height. Missing values are replaced via the screen's
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-- geometry. However, missing height is replaced by the font size.
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menubar.geometry = { width = nil,
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height = nil,
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x = nil,
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y = nil }
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--- Width of blank space left in the right side.
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menubar.right_margin = theme.xresources.apply_dpi(8)
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--- Label used for "Next page", default "▶▶".
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menubar.right_label = "▶▶"
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--- Label used for "Previous page", default "◀◀".
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menubar.left_label = "◀◀"
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-- awful.widget.common.list_update adds three times a margin of dpi(4)
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-- for each item:
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local list_interspace = theme.xresources.apply_dpi(4) * 3
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--- Allows user to specify custom parameters for prompt.run function
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-- (like colors).
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menubar.prompt_args = {}
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-- Private section
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local current_item = 1
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local previous_item = nil
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local current_category = nil
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local shownitems = nil
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local instance = { prompt = nil,
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widget = nil,
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wibox = nil }
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local common_args = { w = wibox.layout.fixed.horizontal(),
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data = setmetatable({}, { __mode = 'kv' }) }
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--- Wrap the text with the color span tag.
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-- @param s The text.
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-- @param c The desired text color.
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-- @return the text wrapped in a span tag.
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local function colortext(s, c)
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return "<span color='" .. awful.util.ensure_pango_color(c) .. "'>" .. s .. "</span>"
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end
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--- Get how the menu item should be displayed.
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-- @param o The menu item.
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-- @return item name, item background color, background image, item icon.
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local function label(o)
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if o.focused then
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return colortext(o.name, theme.fg_focus), theme.bg_focus, nil, o.icon
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else
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return o.name, theme.bg_normal, nil, o.icon
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end
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end
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--- Perform an action for the given menu item.
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-- @param o The menu item.
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-- @return if the function processed the callback, new awful.prompt command, new awful.prompt prompt text.
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local function perform_action(o)
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if not o then return end
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if o.key then
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current_category = o.key
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local new_prompt = shownitems[current_item].name .. ": "
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previous_item = current_item
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current_item = 1
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return true, "", new_prompt
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elseif shownitems[current_item].cmdline then
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awful.spawn(shownitems[current_item].cmdline)
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-- Let awful.prompt execute dummy exec_callback and
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-- done_callback to stop the keygrabber properly.
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return false
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end
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end
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--- Cut item list to return only current page.
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-- @tparam table all_items All items list.
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-- @tparam str query Search query.
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-- @tparam number|screen scr Screen
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-- @return table List of items for current page.
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local function get_current_page(all_items, query, scr)
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scr = get_screen(scr)
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if not instance.prompt.width then
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instance.prompt.width = compute_text_width(instance.prompt.prompt, scr)
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end
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if not menubar.left_label_width then
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menubar.left_label_width = compute_text_width(menubar.left_label, scr)
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end
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if not menubar.right_label_width then
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menubar.right_label_width = compute_text_width(menubar.right_label, scr)
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end
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local available_space = instance.geometry.width - menubar.right_margin -
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menubar.right_label_width - menubar.left_label_width -
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compute_text_width(query, scr) - instance.prompt.width
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local width_sum = 0
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local current_page = {}
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for i, item in ipairs(all_items) do
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item.width = item.width or
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compute_text_width(item.name, scr) +
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(item.icon and instance.geometry.height or 0) + list_interspace
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if width_sum + item.width > available_space then
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if current_item < i then
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table.insert(current_page, { name = menubar.right_label, icon = nil })
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break
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end
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current_page = { { name = menubar.left_label, icon = nil }, item, }
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width_sum = item.width
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else
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table.insert(current_page, item)
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width_sum = width_sum + item.width
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end
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end
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return current_page
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end
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--- Update the menubar according to the command entered by user.
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-- @tparam str query Search query.
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-- @tparam number|screen scr Screen
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local function menulist_update(query, scr)
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query = query or ""
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shownitems = {}
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local pattern = awful.util.query_to_pattern(query)
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local match_inside = {}
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-- First we add entries which names match the command from the
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-- beginning to the table shownitems, and the ones that contain
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-- command in the middle to the table match_inside.
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-- Add the categories
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if menubar.show_categories then
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for _, v in pairs(menubar.menu_gen.all_categories) do
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v.focused = false
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if not current_category and v.use then
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if string.match(v.name, pattern) then
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if string.match(v.name, "^" .. pattern) then
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table.insert(shownitems, v)
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else
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table.insert(match_inside, v)
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end
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end
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end
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end
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end
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-- Add the applications according to their name and cmdline
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for _, v in ipairs(menubar.menu_entries) do
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v.focused = false
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if not current_category or v.category == current_category then
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if string.match(v.name, pattern)
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or string.match(v.cmdline, pattern) then
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if string.match(v.name, "^" .. pattern)
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or string.match(v.cmdline, "^" .. pattern) then
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table.insert(shownitems, v)
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else
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table.insert(match_inside, v)
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end
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end
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end
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end
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-- Now add items from match_inside to shownitems
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for _, v in ipairs(match_inside) do
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table.insert(shownitems, v)
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end
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if #shownitems > 0 then
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-- Insert a run item value as the last choice
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table.insert(shownitems, { name = "Exec: " .. query, cmdline = query, icon = nil })
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if current_item > #shownitems then
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current_item = #shownitems
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end
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shownitems[current_item].focused = true
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else
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table.insert(shownitems, { name = "", cmdline = query, icon = nil })
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end
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common.list_update(common_args.w, nil, label,
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common_args.data,
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get_current_page(shownitems, query, scr))
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end
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--- Create the menubar wibox and widgets.
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local function initialize()
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instance.wibox = wibox({})
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instance.widget = menubar.get()
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instance.wibox.ontop = true
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instance.prompt = awful.widget.prompt()
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local layout = wibox.layout.fixed.horizontal()
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layout:add(instance.prompt)
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layout:add(instance.widget)
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instance.wibox:set_widget(layout)
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end
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--- Refresh menubar's cache by reloading .desktop files.
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function menubar.refresh()
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menubar.menu_entries = menubar.menu_gen.generate()
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end
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--- Awful.prompt keypressed callback to be used when the user presses a key.
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-- @param mod Table of key combination modifiers (Control, Shift).
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-- @param key The key that was pressed.
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-- @param comm The current command in the prompt.
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-- @return if the function processed the callback, new awful.prompt command, new awful.prompt prompt text.
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local function prompt_keypressed_callback(mod, key, comm)
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if key == "Left" or (mod.Control and key == "j") then
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current_item = math.max(current_item - 1, 1)
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return true
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elseif key == "Right" or (mod.Control and key == "k") then
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current_item = current_item + 1
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return true
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elseif key == "BackSpace" then
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if comm == "" and current_category then
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current_category = nil
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current_item = previous_item
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return true, nil, "Run: "
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end
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elseif key == "Escape" then
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if current_category then
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current_category = nil
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current_item = previous_item
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return true, nil, "Run: "
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end
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elseif key == "Home" then
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current_item = 1
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return true
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elseif key == "End" then
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current_item = #shownitems
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return true
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elseif key == "Return" or key == "KP_Enter" then
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if mod.Control then
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current_item = #shownitems
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if mod.Mod1 then
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-- add a terminal to the cmdline
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shownitems[current_item].cmdline = menubar.utils.terminal
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.. " -e " .. shownitems[current_item].cmdline
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end
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end
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return perform_action(shownitems[current_item])
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end
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return false
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end
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--- Show the menubar on the given screen.
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-- @param scr Screen.
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function menubar.show(scr)
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if not instance.wibox then
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initialize()
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elseif instance.wibox.visible then -- Menu already shown, exit
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return
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elseif not menubar.cache_entries then
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menubar.refresh()
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end
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-- Set position and size
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scr = scr or awful.screen.focused() or 1
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scr = get_screen(scr)
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local scrgeom = capi.screen[scr].workarea
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local geometry = menubar.geometry
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instance.geometry = {x = geometry.x or scrgeom.x,
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y = geometry.y or scrgeom.y,
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height = geometry.height or awful.util.round(theme.get_font_height() * 1.5),
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width = geometry.width or scrgeom.width}
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instance.wibox:geometry(instance.geometry)
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current_item = 1
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current_category = nil
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menulist_update(nil, scr)
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local prompt_args = menubar.prompt_args or {}
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prompt_args.prompt = "Run: "
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awful.prompt.run(prompt_args, instance.prompt.widget,
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function() end, -- exe_callback function set to do nothing
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awful.completion.shell, -- completion_callback
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awful.util.get_cache_dir() .. "/history_menu",
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nil,
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menubar.hide, function(query) menulist_update(query, scr) end,
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prompt_keypressed_callback
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)
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instance.wibox.visible = true
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end
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--- Hide the menubar.
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function menubar.hide()
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instance.wibox.visible = false
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end
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--- Get a menubar wibox.
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-- @return menubar wibox.
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function menubar.get()
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menubar.refresh()
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-- Add to each category the name of its key in all_categories
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for k, v in pairs(menubar.menu_gen.all_categories) do
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v.key = k
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end
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return common_args.w
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end
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function menubar.mt:__call(...)
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return menubar.get(...)
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end
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return setmetatable(menubar, menubar.mt)
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-- vim: filetype=lua:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:textwidth=80
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