Merge pull request #247 from rememberYou/master

[etc/awesome.git] / helpers.lua

diff --git a/helpers.lua b/helpers.lua
index 309162e7a3d8e098043a395417f9ad296c439fee..6c0c3c46ec155fc8fbc485186567f2f5874ca171 100644 (file)
--- a/helpers.lua
+++ b/helpers.lua
@@ -8,6 +8,7 @@
 
 local debug  = require("debug")
 
+local assert = assert
 local capi   = { timer = (type(timer) == 'table' and timer or require ("gears.timer")) }
 local io     = { open  = io.open,
                  lines = io.lines,
@@ -61,9 +62,9 @@ end
 function helpers.lines_match(regexp, file)
        local lines = {}
        for index,line in pairs(helpers.lines_from(file)) do
-               if string.match(line, regexp) then 
+               if string.match(line, regexp) then
                        lines[index] = line
-               end  
+               end
        end
        return lines
 end
@@ -105,7 +106,7 @@ end
 
 -- {{{ Pipe operations
 
--- read the full output of a pipe (command)
+-- read the full output of a command output
 function helpers.read_pipe(cmd)
    local f = assert(io.popen(cmd))
    local output = f:read("*all")
@@ -113,6 +114,16 @@ function helpers.read_pipe(cmd)
    return output
 end
 
+-- return line iterator of a command output
+function helpers.pipelines(...)
+    local f = assert(io.popen(...))
+    return function () -- iterator
+        local data = f:read()
+        if data == nil then f:close() end
+        return data
+    end
+end
+
 -- }}}
 
 -- {{{ A map utility
@@ -148,4 +159,5 @@ function helpers.spairs(t)
 end
 --}}}
 
+
 return helpers