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Merge branch 'master' of https://github.com/copycat-killer/lain
[etc/awesome.git] / asyncshell.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5       * (c) 2015, worron                          
6       * (c) 2013, Alexander Yakushev              
7                                                   
8 --]]
9
10 -- Asynchronous io.popen for Awesome WM.
11 -- How to use:
12 -- asyncshell.request('wscript -Kiev', function(output) wwidget.text = output end)
13
14 -- Grab environment
15 local awful = require('awful')
16
17 -- Avoid discrepancies across multiple shells
18 awful.util.shell = '/bin/sh'
19
20 -- Initialize tables for module
21 asyncshell = { request_table = {}, id_counter = 0 }
22
23 -- Request counter
24 local function next_id()
25     asyncshell.id_counter = (asyncshell.id_counter + 1) % 10000
26     return asyncshell.id_counter
27 end
28
29 -- Remove given request
30 function asyncshell.clear(id)
31     if asyncshell.request_table[id] then
32         if asyncshell.request_table[id].timer then
33             asyncshell.request_table[id].timer:stop()
34             asyncshell.request_table[id].timer = nil
35         end
36         asyncshell.request_table[id] = nil
37     end
38 end
39
40 -- Sends an asynchronous request for an output of the shell command
41 -- @param command Command to be executed and taken output from
42 -- @param callback Function to be called when the command finishes
43 -- @param timeout Maximum amount of time to wait for the result (optional)
44 function asyncshell.request(command, callback, timeout)
45     local id = next_id()
46     asyncshell.request_table[id] = { callback = callback }
47
48     local formatted_command = string.gsub(command, '"','\"')
49
50     local req = string.format(
51         "echo \"asyncshell.deliver(%s, [[\\\"$(%s)\\\"]])\" | awesome-client &",
52         id, formatted_command
53     )
54
55     if type(awful.spawn) == 'table' then
56         awful.spawn.with_shell(req)
57     else
58         awful.util.spawn_with_shell(req)
59     end
60
61     if timeout then
62         asyncshell.request_table[id].timer = timer({ timeout = timeout })
63         asyncshell.request_table[id].timer:connect_signal("timeout", function() asyncshell.clear(id) end)
64         asyncshell.request_table[id].timer:start()
65     end
66 end
67
68 -- Calls the remembered callback function on the output of the shell command
69 -- @param id Request ID
70 -- @param output Shell command output to be delievered
71 function asyncshell.deliver(id, output)
72     local output = string.sub(output, 2, -2)
73     if asyncshell.request_table[id] then
74         asyncshell.request_table[id].callback(output)
75         asyncshell.clear(id)
76     end
77 end
78
79 return asyncshell