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[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 then return nil end
42
43     -- For each selected tag get all clients of that tag and add them to
44     -- the menu. A click on a menu item will raise that client.
45     for i = 1,#cls_tags
46     do
47         local t = cls_tags[i]
48         local cls = t:clients()
49
50         for k, c in pairs(cls)
51         do
52             cls_t[#cls_t + 1] = { awful.util.escape(c.name) or "",
53                                   function ()
54                                       c.minimized = false
55                                       client.focus = c
56                                       c:raise()
57                                   end,
58                                   c.icon }
59         end
60     end
61
62     -- No clients? Then quit.
63     if #cls_t <= 0 then return nil end
64
65     -- menu may contain some predefined values, otherwise start with a
66     -- fresh menu.
67     if not menu then menu = {} end
68
69     -- Set the list of items and show the menu.
70     menu.items = cls_t
71     local m = awful.menu.new(menu)
72     m:show(args)
73     return m
74 end
75
76 -- Magnify a client: Set it to "float" and resize it.
77 local magnified_client = nil
78 function util.magnify_client(c)
79     if c and not awful.client.floating.get(c) then
80         util.mc(c)
81         magnified_client = c
82     else
83         awful.client.floating.set(c, false)
84         magnified_client = nil
85     end
86 end
87
88 -- https://github.com/copycat-killer/lain/issues/195
89 function util.mc(c)
90     c = c or magnified_client
91     if not c then return end
92     awful.client.floating.set(c, true)
93     local mg = screen[mouse.screen].geometry
94     local tag = awful.tag.selected(mouse.screen)
95     local mwfact = awful.tag.getmwfact(tag)
96     local g = {}
97     g.width = math.sqrt(mwfact) * mg.width
98     g.height = math.sqrt(mwfact) * mg.height
99     g.x = mg.x + (mg.width - g.width) / 2
100     g.y = mg.y + (mg.height - g.height) / 2
101     if c then c:geometry(g) end -- if c is still a valid object
102 end
103
104 -- Read the nice value of pid from /proc.
105 local function get_nice_value(pid)
106     local n = first_line('/proc/' .. pid .. '/stat')
107     if not n then return 0 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, #awful.tag.gettags(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 -- {{{ Dynamic tagging
163 --
164 -- Add a new tag
165 function util.add_tag()
166     awful.prompt.run {
167         prompt       = "New tag name: ",
168         textbox      = awful.screen.focused().mypromptbox.widget,
169         exe_callback = function(name)
170             if not name or #name == 0 then return end
171             awful.tag.add(name, { screen = awful.screen.focused() }):view_only()
172         end
173     }
174 end
175
176 -- Rename current tag
177 function util.rename_tag()
178     awful.prompt.run {
179         prompt       = "Rename tag: ",
180         textbox      = awful.screen.focused().mypromptbox.widget,
181         exe_callback = function(new_name)
182             if not new_name or #new_name == 0 then return end
183             local t = awful.screen.focused().selected_tag
184             if t then
185                 t.name = new_name
186             end
187         end
188     }
189 end
190
191 -- Move current tag
192 -- pos in {-1, 1} <-> {previous, next} tag position
193 function util.move_tag(pos)
194     local tag = awful.tag.selected(mouse.screen)
195     local idx = awful.tag.getidx(tag)
196     if tonumber(pos) <= -1 then
197         awful.tag.move(idx - 1, tag)
198     else
199         awful.tag.move(idx + 1, tag)
200     end
201 end
202
203 -- Delete current tag
204 -- Any rule set on the tag shall be broken
205 function util.delete_tag()
206     local t = awful.screen.focused().selected_tag
207     if not t then return end
208     t:delete()
209 end
210 -- }}}
211
212 -- On the fly useless gaps change
213 function util.useless_gaps_resize(thatmuch)
214     beautiful.useless_gap = tonumber(beautiful.useless_gap) + thatmuch
215     awful.layout.arrange(mouse.screen)
216 end
217
218 -- Check if an element exist on a table
219 function util.element_in_table(element, tbl)
220     for _, i in pairs(tbl) do
221         if i == element then
222             return true
223         end
224     end
225     return false
226 end
227
228 return setmetatable(util, { __index = wrequire })