{alsa,pulse}bar: fallback for mywibox variable; closes #384

[etc/awesome.git] / helpers.lua

diff --git a/helpers.lua b/helpers.lua
index ce655761405b9a972b58cda4e0e8552052b1daee..fb71335f91a25a6a6b995648a91a8e45e2ef2649 100644 (file)
--- a/helpers.lua
+++ b/helpers.lua
@@ -1,15 +1,16 @@
 --[[
 
      Licensed under GNU General Public License v2
-      * (c) 2013, Luke Bonham
+      * (c) 2013, Luca CPZ
 
 --]]
 
-local spawn = require("awful.spawn")
+local spawn      = require("awful.spawn")
 local timer      = require("gears.timer")
 local debug      = require("debug")
 local io         = { lines = io.lines,
                      open  = io.open }
+local pairs      = pairs
 local rawget     = rawget
 local table      = { sort  = table.sort }
 
@@ -112,7 +113,7 @@ end
 function helpers.async(cmd, callback)
     return spawn.easy_async(cmd,
     function (stdout, stderr, reason, exit_code)
-        callback(stdout)
+        callback(stdout, exit_code)
     end)
 end
 
@@ -120,10 +121,19 @@ end
 function helpers.async_with_shell(cmd, callback)
     return spawn.easy_async_with_shell(cmd,
     function (stdout, stderr, reason, exit_code)
-        callback(stdout)
+        callback(stdout, exit_code)
     end)
 end
 
+-- run a command and execute a function on its output line by line
+function helpers.line_callback(cmd, callback)
+    return spawn.with_line_callback(cmd, {
+        stdout = function (line)
+            callback(line)
+        end,
+    })
+end
+
 -- }}}
 
 -- {{{ A map utility
@@ -170,9 +180,8 @@ function helpers.spairs(t)
     end
 end
 
--- create trivial partition of a set. The trivial partition set is the simplest
--- partition of a set. For e.g., the trivial partition set of {a, b, c}, is
--- simply {{a}, {b}, {c}}.
+-- create the partition of singletons of a given set
+-- example: the trivial partition set of {a, b, c}, is {{a}, {b}, {c}}
 function helpers.trivial_partition_set(set)
     local ss = {}
     for _,e in pairs(set) do