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quake: avoid calling compute_size whenever possible
[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 sqrt         = math.sqrt
17 local pairs        = pairs
18 local client       = client
19 local tonumber     = tonumber
20 local wrequire     = require("lain.helpers").wrequire
21 local setmetatable = setmetatable
22
23 -- Lain utilities submodule
24 -- lain.util
25 local util = { _NAME = "lain.util" }
26
27 -- Like awful.menu.clients, but only show clients of currently selected tags
28 function util.menu_clients_current_tags(menu, args)
29     -- List of currently selected tags.
30     local cls_tags = awful.screen.focused().selected_tags
31
32     if cls_tags == nil then return nil end
33
34     -- Final list of menu items.
35     local cls_t = {}
36
37     -- For each selected tag get all clients of that tag and add them to
38     -- the menu. A click on a menu item will raise that client.
39     for i = 1,#cls_tags do
40         local t   = cls_tags[i]
41         local cls = t:clients()
42
43         for k, c in pairs(cls) do
44             cls_t[#cls_t + 1] = { awful.util.escape(c.name) or "",
45                                   function ()
46                                       c.minimized = false
47                                       client.focus = c
48                                       c:raise()
49                                   end,
50                                   c.icon }
51         end
52     end
53
54     -- No clients? Then quit.
55     if #cls_t <= 0 then return nil end
56
57     -- menu may contain some predefined values, otherwise start with a
58     -- fresh menu.
59     if not menu then menu = {} end
60
61     -- Set the list of items and show the menu.
62     menu.items = cls_t
63     local m = awful.menu(menu)
64     m:show(args)
65
66     return m
67 end
68
69 -- Magnify a client: set it to "float" and resize it.
70 function util.magnify_client(c, width_f, height_f)
71     if c and not c.floating then
72         util.magnified_client = c
73         util.mc(c, width_f, height_f)
74     else
75         util.magnified_client = nil
76         c.floating = false
77     end
78 end
79
80 -- https://github.com/copycat-killer/lain/issues/195
81 function util.mc(c, width_f, height_f)
82     c = c or util.magnified_client
83     if not c then return end
84
85     c.floating   = true
86     local s      = awful.screen.focused()
87     local mg     = s.workarea
88     local g      = {}
89     local mwfact = width_f or s.selected_tag.master_width_factor or 0.5
90     g.width      = sqrt(mwfact) * mg.width
91     g.height     = sqrt(height_f or mwfact) * mg.height
92     g.x          = mg.x + (mg.width - g.width) / 2
93     g.y          = mg.y + (mg.height - g.height) / 2
94
95     if c then c:geometry(g) end -- if c is still a valid object
96 end
97
98 -- Non-empty tag browsing
99 -- direction in {-1, 1} <-> {previous, next} non-empty tag
100 function util.tag_view_nonempty(direction, sc)
101    local s = sc or awful.screen.focused()
102
103    for i = 1, #s.tags do
104        awful.tag.viewidx(direction, s)
105        if #s.clients > 0 then
106            return
107        end
108    end
109 end
110
111 -- {{{ Dynamic tagging
112
113 -- Add a new tag
114 function util.add_tag(layout)
115     awful.prompt.run {
116         prompt       = "New tag name: ",
117         textbox      = awful.screen.focused().mypromptbox.widget,
118         exe_callback = function(name)
119             if not name or #name == 0 then return end
120             awful.tag.add(name, { screen = awful.screen.focused(), layout = layout or awful.layout.suit.tile }):view_only()
121         end
122     }
123 end
124
125 -- Rename current tag
126 function util.rename_tag()
127     awful.prompt.run {
128         prompt       = "Rename tag: ",
129         textbox      = awful.screen.focused().mypromptbox.widget,
130         exe_callback = function(new_name)
131             if not new_name or #new_name == 0 then return end
132             local t = awful.screen.focused().selected_tag
133             if t then
134                 t.name = new_name
135             end
136         end
137     }
138 end
139
140 -- Move current tag
141 -- pos in {-1, 1} <-> {previous, next} tag position
142 function util.move_tag(pos)
143     local tag = awful.screen.focused().selected_tag
144     if tonumber(pos) <= -1 then
145         awful.tag.move(tag.index - 1, tag)
146     else
147         awful.tag.move(tag.index + 1, tag)
148     end
149 end
150
151 -- Delete current tag
152 -- Any rule set on the tag shall be broken
153 function util.delete_tag()
154     local t = awful.screen.focused().selected_tag
155     if not t then return end
156     t:delete()
157 end
158
159 -- }}}
160
161 -- On the fly useless gaps change
162 function util.useless_gaps_resize(thatmuch)
163     local scr = awful.screen.focused()
164     scr.selected_tag.gap = scr.selected_tag.gap + tonumber(thatmuch)
165     awful.layout.arrange(scr)
166 end
167
168 return setmetatable(util, { __index = wrequire })