helpers.lua: restructure to support multiple operating systems

helpers.lua

@@ -12,13 +12,19 @@ local pairs = pairs
 local rawget = rawget
 local require = require
 local tonumber = tonumber
-local io = { open = io.open }
+local io = { 
+    open = io.open, 
+    popen = io.popen 
+}
 local setmetatable = setmetatable
 local getmetatable = getmetatable
 local string = {
     upper = string.upper,
+    lower = string.lower,
     format = string.format
 }
+local pcall = pcall
+local assert = assert
 -- }}}
 
 
@@ -32,11 +38,45 @@ local scroller = {}
 -- }}}
 
 -- {{{ Helper functions
+-- {{{ Determine operating system
+function helpers.getos()
+    local f = io.popen("uname -s")
+    local uname = f:read("*line")
+    f:close()
+
+    return string.lower(uname)
+end
+-- }}}
+
 -- {{{ Loader of vicious modules
 function helpers.wrequire(table, key)
-    local module = rawget(table, key)
-    return module or require(table._NAME .. "." .. key)
+    local ret = rawget(table, key)
+
+    if ret then
+        return ret
+    end
+
+    local ostable = {
+        linux = { "linux", "all" },
+        freebsd = { "freebsd", "bsd", "all" }
+    }
+
+    local os = ostable[helpers.getos()]
+    assert(os, "Vicious: platform not supported.")
+
+    for i = 1, #os do
+        local status, value = pcall(require, table._NAME .. "." .. key .. "_" .. os[i])
+        if status then
+            ret = value
+            break
+        end
+    end
+
+    assert(ret, "Vicious: widget " .. table._NAME .. "." .. key .. " not available for current platform.")
+
+    return ret
 end
+-- }}}
 
 -- {{{ Expose path as a Lua table
 function helpers.pathtotable(dir)