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fix 'attempt to index a nil value (global self)'
[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 pairs        = pairs
19 local string       = { gsub = string.gsub }
20 local client       = client
21 local screen       = screen
22 local tonumber     = tonumber
23
24 local wrequire     = require("lain.helpers").wrequire
25 local setmetatable = setmetatable
26
27 -- Lain utilities submodule
28 -- lain.util
29 local util = { _NAME = "lain.util" }
30
31 -- Like awful.menu.clients, but only show clients of currently selected tags
32 function util.menu_clients_current_tags(menu, args)
33     -- List of currently selected tags.
34     local cls_tags = awful.screen.focused().selected_tags
35
36     if cls_tags == nil then return nil end
37
38     -- Final list of menu items.
39     local cls_t = {}
40
41     -- For each selected tag get all clients of that tag and add them to
42     -- the menu. A click on a menu item will raise that client.
43     for i = 1,#cls_tags do
44         local t   = cls_tags[i]
45         local cls = t:clients()
46
47         for k, c in pairs(cls) do
48             cls_t[#cls_t + 1] = { awful.util.escape(c.name) or "",
49                                   function ()
50                                       c.minimized = false
51                                       client.focus = c
52                                       c:raise()
53                                   end,
54                                   c.icon }
55         end
56     end
57
58     -- No clients? Then quit.
59     if #cls_t <= 0 then return nil end
60
61     -- menu may contain some predefined values, otherwise start with a
62     -- fresh menu.
63     if not menu then menu = {} end
64
65     -- Set the list of items and show the menu.
66     menu.items = cls_t
67     local m = awful.menu(menu)
68     m:show(args)
69
70     return m
71 end
72
73 -- Magnify a client: set it to "float" and resize it.
74 function util.magnify_client(c)
75     if c and not c.floating then
76         util.mc(c)
77         util.magnified_client = c
78     else
79         c.floating = false
80         util.magnified_client = nil
81     end
82 end
83
84 -- https://github.com/copycat-killer/lain/issues/195
85 function util.mc(c)
86     c = c or util.magnified_client
87     if not c then return end
88
89     c.floating   = true
90     local s      = awful.screen.focused()
91     local mg     = s.geometry
92     local mwfact = beautiful.master_width_factor or 0.5
93     local g      = {}
94     g.width      = math.sqrt(mwfact) * mg.width
95     g.height     = math.sqrt(mwfact) * mg.height
96     g.x          = mg.x + (mg.width - g.width) / 2
97     g.y          = mg.y + (mg.height - g.height) / 2
98
99     if c then c:geometry(g) end -- if c is still a valid object
100 end
101
102 -- Non-empty tag browsing
103 -- direction in {-1, 1} <-> {previous, next} non-empty tag
104 function util.tag_view_nonempty(direction, sc)
105    local s = sc or awful.screen.focused()
106
107    for i = 1, #s.tags do
108        awful.tag.viewidx(direction, s)
109        if #s.clients > 0 then
110            return
111        end
112    end
113 end
114
115 -- {{{ Dynamic tagging
116
117 -- Add a new tag
118 function util.add_tag()
119     awful.prompt.run {
120         prompt       = "New tag name: ",
121         textbox      = awful.screen.focused().mypromptbox.widget,
122         exe_callback = function(name)
123             if not name or #name == 0 then return end
124             awful.tag.add(name, { screen = awful.screen.focused() }):view_only()
125         end
126     }
127 end
128
129 -- Rename current tag
130 function util.rename_tag()
131     awful.prompt.run {
132         prompt       = "Rename tag: ",
133         textbox      = awful.screen.focused().mypromptbox.widget,
134         exe_callback = function(new_name)
135             if not new_name or #new_name == 0 then return end
136             local t = awful.screen.focused().selected_tag
137             if t then
138                 t.name = new_name
139             end
140         end
141     }
142 end
143
144 -- Move current tag
145 -- pos in {-1, 1} <-> {previous, next} tag position
146 function util.move_tag(pos)
147     local tag = awful.screen.focused().selected_tag
148     local idx = awful.tag.getidx(tag)
149     if tonumber(pos) <= -1 then
150         awful.tag.move(idx - 1, tag)
151     else
152         awful.tag.move(idx + 1, tag)
153     end
154 end
155
156 -- Delete current tag
157 -- Any rule set on the tag shall be broken
158 function util.delete_tag()
159     local t = awful.screen.focused().selected_tag
160     if not t then return end
161     t:delete()
162 end
163
164 -- }}}
165
166 -- On the fly useless gaps change
167 function util.useless_gaps_resize(thatmuch)
168     beautiful.useless_gap = beautiful.useless_gap or 0
169     beautiful.useless_gap = tonumber(beautiful.useless_gap) + thatmuch
170     awful.layout.arrange(awful.screen.focused())
171 end
172
173 return setmetatable(util, { __index = wrequire })