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mpd: cover_size option added
[etc/awesome.git] / util / init.lua
1
2 --[[
3                                                    
4      Lain                                          
5      Layouts, widgets and utilities for Awesome WM 
6                                                    
7      Utilities section                             
8                                                    
9      Licensed under GNU General Public License v2  
10       * (c) 2013,      Luke Bonham                 
11       * (c) 2010-2012, Peter Hofmann               
12                                                    
13 --]]
14
15 local awful        = require("awful")
16 local beautiful    = require("beautiful")
17 local math         = { sqrt = math.sqrt }
18 local mouse        = mouse
19 local pairs        = pairs
20 local string       = { gsub = string.gsub }
21 local client       = client
22 local screen       = screen
23 local tonumber     = tonumber
24
25 local wrequire     = require("lain.helpers").wrequire
26 local setmetatable = setmetatable
27
28 -- Lain utilities submodule
29 -- lain.util
30 local util = { _NAME = "lain.util" }
31
32 -- Like awful.menu.clients, but only show clients of currently selected
33 -- tags.
34 function util.menu_clients_current_tags(menu, args)
35     -- List of currently selected tags.
36     local cls_tags = awful.tag.selectedlist(mouse.screen)
37
38     -- Final list of menu items.
39     local cls_t = {}
40
41     if cls_tags == nil
42     then
43         return nil
44     end
45
46     -- For each selected tag get all clients of that tag and add them to
47     -- the menu. A click on a menu item will raise that client.
48     for i = 1,#cls_tags
49     do
50         local t = cls_tags[i]
51         local cls = t:clients()
52
53         for k, c in pairs(cls)
54         do
55             cls_t[#cls_t + 1] = { awful.util.escape(c.name) or "",
56                                   function ()
57                                       c.minimized = false
58                                       client.focus = c
59                                       c:raise()
60                                   end,
61                                   c.icon }
62         end
63     end
64
65     -- No clients? Then quit.
66     if #cls_t <= 0
67     then
68         return nil
69     end
70
71     -- menu may contain some predefined values, otherwise start with a
72     -- fresh menu.
73     if not menu
74     then
75         menu = {}
76     end
77
78     -- Set the list of items and show the menu.
79     menu.items = cls_t
80     local m = awful.menu.new(menu)
81     m:show(args)
82     return m
83 end
84
85 -- Magnify a client: Set it to "float" and resize it.
86 function util.magnify_client(c)
87     awful.client.floating.set(c, true)
88
89     local mg = screen[mouse.screen].geometry
90     local tag = awful.tag.selected(mouse.screen)
91     local mwfact = awful.tag.getmwfact(tag)
92     local g = {}
93     g.width = math.sqrt(mwfact) * mg.width
94     g.height = math.sqrt(mwfact) * mg.height
95     g.x = mg.x + (mg.width - g.width) / 2
96     g.y = mg.y + (mg.height - g.height) / 2
97     c:geometry(g)
98 end
99
100 -- Read the nice value of pid from /proc.
101 local function get_nice_value(pid)
102     local n = first_line('/proc/' .. pid .. '/stat')
103     if n == nil
104     then
105         -- This should not happen. But I don't want to crash, either.
106         return 0
107     end
108
109     -- Remove pid and tcomm. This is necessary because tcomm may contain
110     -- nasty stuff such as whitespace or additional parentheses...
111     n = string.gsub(n, '.*%) ', '')
112
113     -- Field number 17 now is the nice value.
114     fields = split(n, ' ')
115     return tonumber(fields[17])
116 end
117
118 -- To be used as a signal handler for "focus"
119 -- This requires beautiful.border_focus{,_highprio,_lowprio}.
120 function util.niceborder_focus(c)
121     local n = get_nice_value(c.pid)
122     if n == 0
123     then
124         c.border_color = beautiful.border_focus
125     elseif n < 0
126     then
127         c.border_color = beautiful.border_focus_highprio
128     else
129         c.border_color = beautiful.border_focus_lowprio
130     end
131 end
132
133 -- To be used as a signal handler for "unfocus"
134 -- This requires beautiful.border_normal{,_highprio,_lowprio}.
135 function util.niceborder_unfocus(c)
136     local n = get_nice_value(c.pid)
137     if n == 0
138     then
139         c.border_color = beautiful.border_normal
140     elseif n < 0
141     then
142         c.border_color = beautiful.border_normal_highprio
143     else
144         c.border_color = beautiful.border_normal_lowprio
145     end
146 end
147
148 -- Non-empty tag browsing
149 -- direction in {-1, 1} <-> {previous, next} non-empty tag
150 function util.tag_view_nonempty(direction, sc)
151    local s = sc or mouse.screen or 1
152    local scr = screen[s]
153
154    for i = 1, #tags[s] do
155        awful.tag.viewidx(direction,s)
156        if #awful.client.visible(s) > 0 then
157            return
158        end
159    end
160 end
161
162 -- Dynamically rename the current tag you have focused.
163 function util.prompt_rename_tag(mypromptbox)
164     local tag = awful.tag.selected(mouse.screen)
165     awful.prompt.run({prompt="Rename tag: "}, mypromptbox[mouse.screen].widget,
166     function(text)
167         if text:len() > 0 then
168             tag.name = text
169             tag:emit_signal("property::name")
170         end
171     end)
172 end
173
174 return setmetatable(util, { __index = wrequire })