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827cf4be4b0f500174ba2279429039d5f39516aa
[etc/awesome.git] / asyncshell_REMOTE_1080.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 -- Initialize tables for module
18 asyncshell = { request_table = {}, id_counter = 0 }
19
20 -- Request counter
21 local function next_id()
22     asyncshell.id_counter = (asyncshell.id_counter + 1) % 10000
23     return asyncshell.id_counter
24 end
25
26 -- Remove given request
27 function asyncshell.clear(id)
28     if asyncshell.request_table[id] then
29         if asyncshell.request_table[id].timer then
30             asyncshell.request_table[id].timer:stop()
31             asyncshell.request_table[id].timer = nil
32         end
33         asyncshell.request_table[id] = nil
34     end
35 end
36
37 -- Sends an asynchronous request for an output of the shell command
38 -- @param command Command to be executed and taken output from
39 -- @param callback Function to be called when the command finishes
40 -- @param timeout Maximum amount of time to wait for the result (optional)
41 function asyncshell.request(command, callback, timeout)
42     local id = next_id()
43     asyncshell.request_table[id] = { callback = callback }
44
45     local formatted_command = string.gsub(command, '"','\"')
46
47     local req = string.format(
48         "echo \"asyncshell.deliver(%s, [[\\\"$(%s)\\\"]])\" | awesome-client &",
49         id, formatted_command
50     )
51
52     awful.util.spawn_with_shell(req)
53
54     if timeout then
55         asyncshell.request_table[id].timer = timer({ timeout = timeout })
56         asyncshell.request_table[id].timer:connect_signal("timeout", function() asyncshell.clear(id) end)
57         asyncshell.request_table[id].timer:start()
58     end
59 end
60
61 -- Calls the remembered callback function on the output of the shell command
62 -- @param id Request ID
63 -- @param output Shell command output to be delievered
64 function asyncshell.deliver(id, output)
65     local output = string.sub(output, 2, -2)
66     if asyncshell.request_table[id] then
67         asyncshell.request_table[id].callback(output)
68         asyncshell.clear(id)
69     end
70 end
71
72 return asyncshell