Revert "Update"

This reverts commit 777960ac7b.

.config/awesome/lain/helpers.lua

@@ -0,0 +1,167 @@
+--[[
+
+     Licensed under GNU General Public License v2
+      * (c) 2013, Luke Bonham
+
+--]]
+
+local easy_async = require("awful.spawn").easy_async
+local timer      = require("gears.timer")
+local debug      = require("debug")
+local io         = { lines = io.lines,
+                     open  = io.open }
+local rawget     = rawget
+local table      = { sort  = table.sort }
+
+-- Lain helper functions for internal use
+-- lain.helpers
+local helpers = {}
+
+helpers.lain_dir    = debug.getinfo(1, 'S').source:match[[^@(.*/).*$]]
+helpers.icons_dir   = helpers.lain_dir .. 'icons/'
+helpers.scripts_dir = helpers.lain_dir .. 'scripts/'
+
+-- {{{ Modules loader
+
+function helpers.wrequire(table, key)
+    local module = rawget(table, key)
+    return module or require(table._NAME .. '.' .. key)
+end
+
+-- }}}
+
+-- {{{ File operations
+
+-- see if the file exists and is readable
+function helpers.file_exists(file)
+  local f = io.open(file)
+  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
+-- list/table if the file does not exist
+function helpers.lines_from(file)
+  if not helpers.file_exists(file) then return {} end
+  local lines = {}
+  for line in io.lines(file) do
+    lines[#lines + 1] = line
+  end
+  return lines
+end
+
+-- match all lines from a file, returns an empty
+-- list/table if the file or match does not exist
+function helpers.lines_match(regexp, file)
+	local lines = {}
+	for index,line in pairs(helpers.lines_from(file)) do
+		if string.match(line, regexp) then
+			lines[index] = line
+		end
+	end
+	return lines
+end
+
+-- get first line of a file, return nil if
+-- the file does not exist
+function helpers.first_line(file)
+    return helpers.lines_from(file)[1]
+end
+
+-- get first non empty line from a file,
+-- 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
+  end
+  return nil
+end
+
+-- }}}
+
+-- {{{ Timer maker
+
+helpers.timer_table = {}
+
+function helpers.newtimer(name, timeout, fun, nostart, stoppable)
+    if not name or #name == 0 then return end
+    name = (stoppable and name) or timeout
+    if not helpers.timer_table[name] then
+        helpers.timer_table[name] = timer({ timeout = timeout })
+        helpers.timer_table[name]:start()
+    end
+    helpers.timer_table[name]:connect_signal("timeout", fun)
+    if not nostart then
+        helpers.timer_table[name]:emit_signal("timeout")
+    end
+    return stoppable and helpers.timer_table[name]
+end
+
+-- }}}
+
+-- {{{ Pipe operations
+
+-- run a command and execute a function on its output (asynchronous pipe)
+-- @param cmd the input command
+-- @param callback function to execute on cmd output
+-- @return cmd PID
+function helpers.async(cmd, callback)
+    return easy_async(cmd,
+    function (stdout, stderr, reason, exit_code)
+        callback(stdout)
+    end)
+end
+
+-- }}}
+
+-- {{{ A map utility
+
+helpers.map_table = {}
+
+function helpers.set_map(element, value)
+    helpers.map_table[element] = value
+end
+
+function helpers.get_map(element)
+    return helpers.map_table[element]
+end
+
+-- }}}
+
+-- {{{ Misc
+
+-- check if an element exist on a table
+function helpers.element_in_table(element, tbl)
+    for _, i in pairs(tbl) do
+        if i == element then
+            return true
+        end
+    end
+    return false
+end
+
+-- iterate over table of records sorted by keys
+function helpers.spairs(t)
+    -- collect the keys
+    local keys = {}
+    for k in pairs(t) do keys[#keys+1] = k end
+
+    table.sort(keys)
+
+    -- return the iterator function
+    local i = 0
+    return function()
+        i = i + 1
+        if keys[i] then
+            return keys[i], t[keys[i]]
+        end
+    end
+end
+
+-- }}}
+
+return helpers