os: import operating system information widget

This widget type returns 1st value as the operating system in use, 2nd
as the release version, 3rd as your username and 4th the hostname.

README

@@ -210,6 +210,11 @@ vicious.widgets.mem
     in percent, 6th as swap usage, 7th as total system swap and 8th as
     free swap
 
+vicious.widgets.os
+  - provides operating system information
+  - returns 1st value as the operating system in use, 2nd as the
+    release version, 3rd as your username and 4th the hostname
+
 vicious.widgets.fs
   - provides file system disk space usage
   - takes an (optional) argument which, if true, includes remote file

init.lua

@@ -28,6 +28,7 @@ require("vicious.thermal")
 require("vicious.uptime")
 require("vicious.bat")
 require("vicious.mem")
+require("vicious.os")
 require("vicious.fs")
 require("vicious.dio")
 require("vicious.hddtemp")

os.lua

@@ -0,0 +1,58 @@
+---------------------------------------------------
+-- Licensed under the GNU General Public License v2
+--  * (c) 2010, Adrian C. <anrxc@sysphere.org>
+---------------------------------------------------
+
+-- {{{ Grab environment
+local pairs = pairs
+local io = { popen = io.popen }
+local os = { getenv = os.getenv }
+local setmetatable = setmetatable
+local helpers = require("vicious.helpers")
+local string = {
+    gsub = string.gsub,
+    match = string.match
+}
+-- }}}
+
+
+-- OS: provides operating system information
+module("vicious.os")
+
+
+-- {{{ Operating system widget type
+local function worker(format)
+    local system = {
+        ["ostype"]    = "N/A",
+        ["hostname"]  = "N/A",
+        ["osrelease"] = "N/A",
+        ["username"]  = "N/A"
+    }
+
+    -- Linux manual page: uname(2)
+    local kernel = helpers.pathtotable("/proc/sys/kernel")
+    for k, v in pairs(system) do
+        if kernel[k] then
+            system[k] = string.gsub(kernel[k], "[%s]*$", "")
+        end
+    end
+
+    -- BSD manual page: uname(1)
+    if system["ostype"] == "N/A" then
+        local f = io.popen("uname -snr")
+        local uname = f:read("*line")
+        f:close()
+
+        system["ostype"], system["hostname"], system["osrelease"] =
+            string.match(uname, "([%w]+)[%s]([%w%p]+)[%s]([%w%p]+)")
+    end
+
+    -- Get user from the environment
+    system["username"] = os.getenv("USER")
+
+    return {system["ostype"],   system["osrelease"],
+            system["username"], system["hostname"]}
+end
+-- }}}
+
+setmetatable(_M, { __call = function(_, ...) return worker(...) end })