X-Git-Url: https://git.madduck.net/etc/awesome.git/blobdiff_plain/9cd85a25829cc600c05622c1f92a97b257918835..98977a1888c57a00dbefcbf83c4e598daeab33aa:/helpers.lua

diff --git a/helpers.lua b/helpers.lua
index f2bd5e4..503c40e 100644
--- a/helpers.lua
+++ b/helpers.lua
@@ -2,16 +2,16 @@
 --[[
                                                   
      Licensed under GNU General Public License v2 
-      * (c) 2013,      Luke Bonham                
-      * (c) 2010-2012, Peter Hofmann              
+      * (c) 2013, Luke Bonham                     
                                                   
 --]]
 
 local debug  = require("debug")
 
 local capi   = { timer = timer }
-local io     = { open = io.open,
-                 lines = io.lines }
+local io     = { open  = io.open,
+                 lines = io.lines,
+                 popen = io.popen }
 local rawget = rawget
 
 -- Lain helper functions for internal use
@@ -33,19 +33,23 @@ end
 
 -- {{{ File operations
 
--- see if the file exists
+-- see if the file exists and is readable
 function helpers.file_exists(file)
   local f = io.open(file)
-  if f then f:close() end
+  if f then
+      local s = f:read()
+      f:close()
+      f = s
+  end
   return f ~= nil
 end
 
--- get all lines from a file, returns an empty 
+-- get all lines from a file, returns an empty
 -- list/table if the file does not exist
 function helpers.lines_from(file)
   if not helpers.file_exists(file) then return {} end
   lines = {}
-  for line in io.lines(file) do 
+  for line in io.lines(file) do
     lines[#lines + 1] = line
   end
   return lines
@@ -61,7 +65,7 @@ end
 -- returns nil otherwise
 function helpers.first_nonempty_line(file)
   for k,v in pairs(helpers.lines_from(file)) do
-    if #v then return v end 
+    if #v then return v end
   end
   return nil
 end
@@ -72,10 +76,16 @@ end
 
 helpers.timer_table = {}
 
-function helpers.newtimer(name, timeout, fun, nostart)
-    helpers.timer_table[name] = capi.timer({ timeout = timeout })
+function helpers.newtimer(_name, timeout, fun, nostart)
+    local name = timeout
+
+    if not helpers.timer_table[name] then
+        helpers.timer_table[name] = capi.timer({ timeout = timeout })
+        helpers.timer_table[name]:start()
+    end
+
     helpers.timer_table[name]:connect_signal("timeout", fun)
-    helpers.timer_table[name]:start()
+
     if not nostart then
         helpers.timer_table[name]:emit_signal("timeout")
     end
@@ -83,6 +93,18 @@ end
 
 -- }}}
 
+-- {{{ Pipe operations
+
+-- read the full output of a pipe (command)
+function helpers.read_pipe(cmd)
+   local f = assert(io.popen(cmd))
+   local output = f:read("*all")
+   f:close()
+   return output
+end
+
+-- }}}
+
 -- {{{ A map utility
 
 helpers.map_table = {}