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73 lines
2.3 KiB
73 lines
2.3 KiB
9 years ago
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--[[
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Licensed under GNU General Public License v2
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* (c) 2015, worron
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* (c) 2013, Alexander Yakushev
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--]]
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-- Asynchronous io.popen for Awesome WM.
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-- How to use:
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-- asyncshell.request('wscript -Kiev', function(output) wwidget.text = output end)
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-- Grab environment
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local awful = require('awful')
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-- Initialize tables for module
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asyncshell = { request_table = {}, id_counter = 0 }
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-- Request counter
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local function next_id()
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asyncshell.id_counter = (asyncshell.id_counter + 1) % 10000
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return asyncshell.id_counter
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end
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-- Remove given request
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function asyncshell.clear(id)
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if asyncshell.request_table[id] then
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if asyncshell.request_table[id].timer then
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asyncshell.request_table[id].timer:stop()
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asyncshell.request_table[id].timer = nil
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end
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asyncshell.request_table[id] = nil
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end
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end
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-- Sends an asynchronous request for an output of the shell command
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-- @param command Command to be executed and taken output from
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-- @param callback Function to be called when the command finishes
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-- @param timeout Maximum amount of time to wait for the result (optional)
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function asyncshell.request(command, callback, timeout)
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local id = next_id()
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asyncshell.request_table[id] = { callback = callback }
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local formatted_command = string.gsub(command, '"','\"')
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local req = string.format(
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"echo \"asyncshell.deliver(%s, [[\\\"$(%s)\\\"]])\" | awesome-client &",
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id, formatted_command
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)
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awful.util.spawn_with_shell(req)
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if timeout then
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asyncshell.request_table[id].timer = timer({ timeout = timeout })
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asyncshell.request_table[id].timer:connect_signal("timeout", function() asyncshell.clear(id) end)
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asyncshell.request_table[id].timer:start()
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end
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end
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-- Calls the remembered callback function on the output of the shell command
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-- @param id Request ID
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-- @param output Shell command output to be delievered
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function asyncshell.deliver(id, output)
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local output = string.sub(output, 2, -2)
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if asyncshell.request_table[id] then
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asyncshell.request_table[id].callback(output)
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asyncshell.clear(id)
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end
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end
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return asyncshell
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