os: merge with entropy widget type

Operating System widget type now returns two additional values, 5th as
available system entropy and 6th as available entropy in percent.

README

@@ -153,7 +153,9 @@ vicious.widgets.mem
 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
+    release version, 3rd as your username, 4th the hostname, 5th as
+    available system entropy and 6th value as available entropy in
+    percent
 
 vicious.widgets.fs
   - provides file system disk space usage
@@ -220,11 +222,6 @@ vicious.widgets.gmail
     machine mail.google.com login user password pass
   - returns a table with string keys: {count} and {subject}
 
-vicious.widgets.entropy
-  - provides available system entropy
-  - returns 1st value as available system entropy and 2nd value as
-    available entropy in percent
-
 vicious.widgets.org
   - provides agenda statistics for Emacs org-mode
   - takes a table with full paths to agenda files, that will be

widgets/entropy.lua

@@ -1,33 +0,0 @@
----------------------------------------------------
--- Licensed under the GNU General Public License v2
---  * (c) 2010, Adrian C. <anrxc@sysphere.org>
----------------------------------------------------
-
--- {{{ Grab environment
-local tonumber = tonumber
-local setmetatable = setmetatable
-local math = { ceil = math.ceil }
-local helpers = require("vicious.helpers")
--- }}}
-
-
--- Entropy: provides available system entropy
-module("vicious.widgets.entropy")
-
-
--- {{{ Entropy widget type
-local function worker(format)
-    local random = helpers.pathtotable("/proc/sys/kernel/random")
-
-    -- Linux 2.6 has a default entropy pool of 4096-bits
-    local poolsize = tonumber(random.poolsize)
-    -- Get available entropy
-    local ent = tonumber(random.entropy_avail)
-    -- Calculate percentage
-    local ent_percent = math.ceil(ent * 100 / poolsize)
-
-    return {ent, ent_percent}
-end
--- }}}
-
-setmetatable(_M, { __call = function(_, ...) return worker(...) end })

widgets/init.lua

@@ -23,7 +23,6 @@ require("vicious.widgets.mbox")
 require("vicious.widgets.mboxc")
 require("vicious.widgets.mdir")
 require("vicious.widgets.gmail")
-require("vicious.widgets.entropy")
 require("vicious.widgets.org")
 require("vicious.widgets.pkg")
 require("vicious.widgets.mpd")

widgets/os.lua

@@ -5,8 +5,10 @@
 
 -- {{{ Grab environment
 local pairs = pairs
+local tonumber = tonumber
 local io = { popen = io.popen }
 local os = { getenv = os.getenv }
+local math = { ceil = math.ceil }
 local setmetatable = setmetatable
 local helpers = require("vicious.helpers")
 local string = {
@@ -26,7 +28,9 @@ local function worker(format)
         ["ostype"]    = "N/A",
         ["hostname"]  = "N/A",
         ["osrelease"] = "N/A",
-        ["username"]  = "N/A"
+        ["username"]  = "N/A",
+        ["entropy"]   = "N/A",
+        ["entropy_p"] = "N/A"
     }
 
     -- Linux manual page: uname(2)
@@ -47,11 +51,21 @@ local function worker(format)
             string.match(uname, "([%w]+)[%s]([%w%p]+)[%s]([%w%p]+)")
     end
 
+    -- Linux manual page: random(4)
+    if kernel.random then
+        -- Linux 2.6 default entropy pool is 4096-bits
+        local poolsize = tonumber(kernel.random.poolsize)
+
+        -- Get available entropy and calculate percentage
+        system["entropy"]   = tonumber(kernel.random.entropy_avail)
+        system["entropy_p"] = math.ceil(system["entropy"] * 100 / poolsize)
+    end
+
     -- Get user from the environment
     system["username"] = os.getenv("USER")
 
-    return {system["ostype"],   system["osrelease"],
-            system["username"], system["hostname"]}
+    return {system["ostype"], system["osrelease"], system["username"],
+            system["hostname"], system["entropy"], system["entropy_p"]}
 end
 -- }}}