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5c6e7e8e7fab0eb07fd5724780d72ef431a41d61
[etc/awesome.git] / asyncshell_BACKUP_32072.lua
1
2 --[[
3                                                   
4      Licensed under GNU General Public License v2 
5 <<<<<<< HEAD
6 =======
7       * (c) 2015, worron                          
8 >>>>>>> upstream/master
9       * (c) 2013, Alexander Yakushev              
10                                                   
11 --]]
12
13 -- Asynchronous io.popen for Awesome WM.
14 <<<<<<< HEAD
15 -- How to use...
16 -- ...asynchronously:
17 -- asyncshell.request('wscript -Kiev', function(f) wwidget.text = f:read("*l") end)
18 -- ...synchronously:
19 -- widget:set_text(asyncshell.demand('wscript -Kiev', 5):read("*l") or "Error")
20
21 local spawn = require('awful.util').spawn
22
23 asyncshell               = {}
24 asyncshell.request_table = {}
25 asyncshell.id_counter    = 0
26 asyncshell.folder        = "/tmp/asyncshell"
27 asyncshell.file_template = asyncshell.folder .. '/req'
28
29 -- Create a directory for asynchell response files
30 os.execute("mkdir -p " .. asyncshell.folder)
31
32 -- Returns next tag - unique identifier of the request
33 local function next_id()
34    asyncshell.id_counter = (asyncshell.id_counter + 1) % 100000
35    return asyncshell.id_counter
36 end
37
38 -- Sends an asynchronous request for an output of the shell command.
39 -- @param command Command to be executed and taken output from
40 -- @param callback Function to be called when the command finishes
41 -- @return Request ID
42 function asyncshell.request(command, callback)
43    local id = next_id()
44    local tmpfname = asyncshell.file_template .. id
45    asyncshell.request_table[id] = { callback = callback }
46    local req =
47       string.format("sh -c '%s > %s; " ..
48                     'echo "asyncshell.deliver(%s)" | ' ..
49                     "awesome-client' 2> /dev/null",
50                     string.gsub(command, "'", "'\\''"), tmpfname, id)
51    spawn(req, false)
52    return id
53 end
54
55 -- Calls the remembered callback function on the output of the shell
56 -- command.
57 -- @param id Request ID
58 -- @param output The output file of the shell command to be delievered
59 function asyncshell.deliver(id)
60    if asyncshell.request_table[id] and
61       asyncshell.request_table[id].callback then
62       local output = io.open(asyncshell.file_template .. id, 'r')
63       asyncshell.request_table[id].callback(output)
64    end
65 end
66
67 -- Sends a synchronous request for an output of the command. Waits for
68 -- the output, but if the given timeout expires returns nil.
69 -- @param command Command to be executed and taken output from
70 -- @param timeout Maximum amount of time to wait for the result
71 -- @return File handler on success, nil otherwise
72 function asyncshell.demand(command, timeout)
73    local id = next_id()
74    local tmpfname = asyncshell.file_template .. id
75    local f = io.popen(string.format("(%s > %s; echo asyncshell_done) & " ..
76                                     "(sleep %s; echo asynchell_timeout)",
77                                     command, tmpfname, timeout))
78    local result = f:read("*line")
79    if result == "asyncshell_done" then
80       return io.open(tmpfname)
81    end
82 =======
83 -- How to use:
84 -- asyncshell.request('wscript -Kiev', function(output) wwidget.text = output end)
85
86 -- Grab environment
87 local awful = require('awful')
88
89 -- Initialize tables for module
90 asyncshell = { request_table = {}, id_counter = 0 }
91
92 -- Request counter
93 local function next_id()
94     asyncshell.id_counter = (asyncshell.id_counter + 1) % 10000
95     return asyncshell.id_counter
96 end
97
98 -- Remove given request
99 function asyncshell.clear(id)
100     if asyncshell.request_table[id] then
101         if asyncshell.request_table[id].timer then
102             asyncshell.request_table[id].timer:stop()
103             asyncshell.request_table[id].timer = nil
104         end
105         asyncshell.request_table[id] = nil
106     end
107 end
108
109 -- Sends an asynchronous request for an output of the shell command
110 -- @param command Command to be executed and taken output from
111 -- @param callback Function to be called when the command finishes
112 -- @param timeout Maximum amount of time to wait for the result (optional)
113 function asyncshell.request(command, callback, timeout)
114     local id = next_id()
115     asyncshell.request_table[id] = { callback = callback }
116
117     local formatted_command = string.gsub(command, '"','\"')
118
119     local req = string.format(
120         "echo \"asyncshell.deliver(%s, [[\\\"$(%s)\\\"]])\" | awesome-client &",
121         id, formatted_command
122     )
123
124     awful.util.spawn_with_shell(req)
125
126     if timeout then
127         asyncshell.request_table[id].timer = timer({ timeout = timeout })
128         asyncshell.request_table[id].timer:connect_signal("timeout", function() asyncshell.clear(id) end)
129         asyncshell.request_table[id].timer:start()
130     end
131 end
132
133 -- Calls the remembered callback function on the output of the shell command
134 -- @param id Request ID
135 -- @param output Shell command output to be delievered
136 function asyncshell.deliver(id, output)
137     local output = string.sub(output, 2, -2)
138     if asyncshell.request_table[id] then
139         asyncshell.request_table[id].callback(output)
140         asyncshell.clear(id)
141     end
142 >>>>>>> upstream/master
143 end
144
145 return asyncshell