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widget.bat: add failsafe AC
[etc/awesome.git] / layout / termfair.lua
1 --[[
2
3      Licensed under GNU General Public License v2
4       * (c) 2014,      projektile
5       * (c) 2013,      Luca CPZ
6       * (c) 2010,      Nicolas Estibals
7       * (c) 2010-2012, Peter Hofmann
8
9 --]]
10
11 local math     = { ceil  = math.ceil,
12                    floor = math.floor,
13                    max   = math.max }
14 local screen   = screen
15 local tonumber = tonumber
16
17 local termfair  = { name = "termfair" }
18 termfair.center = { name = "centerfair" }
19
20 local function do_fair(p, orientation)
21     local t = p.tag or screen[p.screen].selected_tag
22     local wa = p.workarea
23     local cls = p.clients
24
25     if #cls == 0 then return end
26
27     if orientation == "west" then
28         -- Layout with fixed number of vertical columns (read from nmaster).
29         -- New windows align from left to right. When a row is full, a now
30         -- one above it is created. Like this:
31
32         --        (1)                (2)                (3)
33         --   +---+---+---+      +---+---+---+      +---+---+---+
34         --   |   |   |   |      |   |   |   |      |   |   |   |
35         --   | 1 |   |   |  ->  | 2 | 1 |   |  ->  | 3 | 2 | 1 |  ->
36         --   |   |   |   |      |   |   |   |      |   |   |   |
37         --   +---+---+---+      +---+---+---+      +---+---+---+
38
39         --        (4)                (5)                (6)
40         --   +---+---+---+      +---+---+---+      +---+---+---+
41         --   | 4 |   |   |      | 5 | 4 |   |      | 6 | 5 | 4 |
42         --   +---+---+---+  ->  +---+---+---+  ->  +---+---+---+
43         --   | 3 | 2 | 1 |      | 3 | 2 | 1 |      | 3 | 2 | 1 |
44         --   +---+---+---+      +---+---+---+      +---+---+---+
45
46         -- How many vertical columns? Read from nmaster on the tag.
47         local num_x = tonumber(termfair.nmaster) or t.master_count
48         local ncol  = tonumber(termfair.ncol) or t.column_count
49
50         if num_x <= 2 then num_x = 2 end
51         if ncol  <= 1 then ncol  = 1 end
52         local width = math.floor(wa.width/num_x)
53
54         local num_y     = math.max(math.ceil(#cls / num_x), ncol)
55         local height    = math.floor(wa.height/num_y)
56         local cur_num_x = num_x
57         local at_x      = 0
58         local at_y      = 0
59
60         local remaining_clients = #cls
61
62         -- We start the first row. Left-align by limiting the number of
63         -- available slots.
64         if remaining_clients < num_x then
65             cur_num_x = remaining_clients
66         end
67
68         -- Iterate in reversed order.
69         for i = #cls,1,-1 do
70             -- Get x and y position.
71             local c = cls[i]
72             local this_x = cur_num_x - at_x - 1
73             local this_y = num_y - at_y - 1
74
75             -- Calculate geometry.
76             local g = {}
77             if this_x == (num_x - 1) then
78                 g.width = wa.width - (num_x - 1)*width
79             else
80                 g.width = width
81             end
82
83             if this_y == (num_y - 1) then
84                 g.height = wa.height - (num_y - 1)*height
85             else
86                 g.height = height
87             end
88
89             g.x = wa.x + this_x*width
90             g.y = wa.y + this_y*height
91
92             if g.width  < 1 then g.width  = 1 end
93             if g.height < 1 then g.height = 1 end
94
95             p.geometries[c] = g
96
97             remaining_clients = remaining_clients - 1
98
99             -- Next grid position.
100             at_x = at_x + 1
101             if at_x == num_x then
102                 -- Row full, create a new one above it.
103                 at_x = 0
104                 at_y = at_y + 1
105
106                 -- We start a new row. Left-align.
107                 if remaining_clients < num_x then
108                     cur_num_x = remaining_clients
109                 end
110             end
111         end
112     elseif orientation == "center" then
113         -- Layout with fixed number of vertical columns (read from nmaster).
114         -- Cols are centerded until there is nmaster columns, then windows
115         -- are stacked in the slave columns, with at most ncol clients per
116         -- column if possible.
117
118         -- with nmaster=3 and ncol=1 you'll have
119         --        (1)                (2)                (3)
120         --   +---+---+---+      +-+---+---+-+      +---+---+---+
121         --   |   |   |   |      | |   |   | |      |   |   |   |
122         --   |   | 1 |   |  ->  | | 1 | 2 | | ->   | 1 | 2 | 3 |  ->
123         --   |   |   |   |      | |   |   | |      |   |   |   |
124         --   +---+---+---+      +-+---+---+-+      +---+---+---+
125
126         --        (4)                (5)
127         --   +---+---+---+      +---+---+---+
128         --   |   |   | 3 |      |   | 2 | 4 |
129         --   + 1 + 2 +---+  ->  + 1 +---+---+
130         --   |   |   | 4 |      |   | 3 | 5 |
131         --   +---+---+---+      +---+---+---+
132
133         -- How many vertical columns? Read from nmaster on the tag.
134         local num_x = tonumber(termfair.center.nmaster) or t.master_count
135         local ncol  = tonumber(termfair.center.ncol) or t.column_count
136
137         if num_x <= 2 then num_x = 2 end
138         if ncol  <= 1 then ncol  = 1 end
139
140         local width = math.floor(wa.width / num_x)
141
142         if #cls < num_x then
143             -- Less clients than the number of columns, let's center it!
144             local offset_x = wa.x + (wa.width - #cls*width) / 2
145             for i = 1, #cls do
146                 local g = { y = wa.y }
147                 g.width  = width
148                 g.height = wa.height
149                 if g.width < 1 then g.width = 1 end
150                 if g.height < 1 then g.height = 1 end
151                 g.x = offset_x + (i - 1) * width
152                 p.geometries[cls[i]] = g
153             end
154         else
155             -- More clients than the number of columns, let's arrange it!
156             -- Master client deserves a special treatement
157             local g = {}
158             g.width = wa.width - (num_x - 1)*width
159             g.height = wa.height
160             if g.width < 1 then g.width = 1 end
161             if g.height < 1 then g.height = 1 end
162             g.x = wa.x
163             g.y = wa.y
164             p.geometries[cls[1]] = g
165
166             -- Treat the other clients
167
168             -- Compute distribution of clients among columns
169             local num_y = {}
170             local remaining_clients = #cls-1
171             local ncol_min = math.ceil(remaining_clients/(num_x-1))
172
173             if ncol >= ncol_min then
174                 for i = (num_x-1), 1, -1 do
175                     if (remaining_clients-i+1) < ncol then
176                         num_y[i] = remaining_clients-i + 1
177                     else
178                         num_y[i] = ncol
179                     end
180                     remaining_clients = remaining_clients - num_y[i]
181                 end
182             else
183                 local rem = remaining_clients % (num_x-1)
184                 if rem == 0 then
185                     for i = 1, num_x-1 do
186                         num_y[i] = ncol_min
187                     end
188                 else
189                     for i = 1, num_x-1 do
190                         num_y[i] = ncol_min - 1
191                     end
192                     for i = 0, rem-1 do
193                         num_y[num_x-1-i] = num_y[num_x-1-i] + 1
194                     end
195                 end
196             end
197
198             -- Compute geometry of the other clients
199             local nclient = 2 -- we start with the 2nd client
200             local wx = g.x + g.width
201             for i = 1, (num_x-1) do
202                 local height = math.floor(wa.height / num_y[i])
203                 local wy = wa.y
204                 for j = 0, (num_y[i]-2) do
205                     local g = {}
206                     g.x = wx
207                     g.y = wy
208                     g.height = height
209                     g.width = width
210                     if g.width < 1 then g.width = 1 end
211                     if g.height < 1 then g.height = 1 end
212                     p.geometries[cls[nclient]] = g
213                     nclient = nclient + 1
214                     wy = wy + height
215                 end
216                 local g = {}
217                 g.x = wx
218                 g.y = wy
219                 g.height = wa.height - (num_y[i] - 1)*height
220                 g.width = width
221                 if g.width < 1 then g.width = 1 end
222                 if g.height < 1 then g.height = 1 end
223                 p.geometries[cls[nclient]] = g
224                 nclient = nclient + 1
225                 wx = wx + width
226             end
227         end
228     end
229 end
230
231 function termfair.center.arrange(p)
232     return do_fair(p, "center")
233 end
234
235 function termfair.arrange(p)
236     return do_fair(p, "west")
237 end
238
239 return termfair