gmail: switch to ~/.netrc for login storage

Login information is now kept in the ~/.netrc file, which should be
readable only by the owner. This should solve futher problems with
unquoted characters addressed in the last commit. The format of the
~/.netrc file is as follows (also documented in the README):
machine mail.google.com login user password pass

README

@@ -131,11 +131,12 @@ great for saving power.
 
 Security
 --------
+
 At the moment only one widget type (Gmail) requires auth. information
 in order to get to the data. In the future there could be more, and
 you should give some thought to the issue of protecting your data. The
-Gmail widget type by default stores login information in the module it
+Gmail widget type by default stores login information in the ~/.netrc
-self, and you are advised to make sure that file is only readable by
+file, and you are advised to make sure that file is only readable by
 the owner. Other than that we can not force all users to conform to
 one standard, one way of keeping it secure, like in some keyring.
 
@@ -152,11 +153,9 @@ be done with tools like "dbus-send" and "qdbus". The Gnome keyring
 should support the same, so those with parts of Gnome installed could
 use that keyring.
 
-Some users move their login into an external file and read it from
+Users of GnuPG (and its agent) could consider encrypting the netrc
-there. Not much different than keeping it in the module, but what if
+file with their GPG key. Trough the GPG Passphrase Agent they could
-you encrypt the file with your GPG key? Users of the GPG Passphrase
+then decrypt the file transparently while their session is active.
-Agent could decrypt the file transparently while their session is
-active.
 
 
 Widget types
@@ -271,6 +270,8 @@ vicious.widgets.gmail
   - takes an (optional) argument, if it's a number subject will be
     truncated, if a table, with 1st field as maximum lenght and 2nd
     the widget name (i.e. "gmailwidget"), scrolling will be used
+  - keeps login information in the ~/.netrc file, example:
+    machine mail.google.com login user password pass
   - returns a table with string keys: {count} and {subject}
 
 vicious.widgets.entropy

gmail.lua

@@ -8,8 +8,11 @@ local type = type
 local tonumber = tonumber
 local io = { popen = io.popen }
 local setmetatable = setmetatable
-local string = { match = string.match }
 local helpers = require("vicious.helpers")
+local string = {
+    find = string.find,
+    match = string.match
+}
 -- }}}
 
 
@@ -21,37 +24,32 @@ module("vicious.gmail")
 local rss = {
   inbox   = {
     "https://mail.google.com/mail/feed/atom",
-    "Gmail - Inbox for "
+    "Gmail %- Inbox"
   },
   unread  = {
     "https://mail.google.com/mail/feed/atom/unread",
-    "Gmail - Label 'unread' for "
+    "Gmail %- Label"
   },
   --labelname = {
   --  "https://mail.google.com/mail/feed/atom/labelname",
-  --  "Gmail - Label 'labelname' for "
+  --  "Gmail %- Label"
   --},
 }
 
--- Todo: safer storage, maybe hook into Kwallet
+-- Default is all unread
-local cfg = {
+local feed = rss.unread
-  user = "",        -- user@gmail.com
-  pass = "",        -- users password
-  feed = rss.unread -- default is all unread
-}
 -- }}}
 
 
 -- {{{ Gmail widget type
 local function worker(format, warg)
-    local auth = cfg.user ..":".. cfg.pass
     local mail = {
         ["{count}"]   = 0,
         ["{subject}"] = "N/A"
     }
 
     -- Get info from the Gmail atom feed
-    local f = io.popen("curl --connect-timeout 1 -m 3 -fsu '"..auth.."' "..cfg.feed[1])
+    local f = io.popen("curl --connect-timeout 1 -m 3 -fsn " .. feed[1])
 
     -- Could be huge don't read it all at once, info we are after is at the top
     for line in f:lines() do
@@ -61,7 +59,7 @@ local function worker(format, warg)
         -- Find subject tags
         local title = string.match(line, "<title>(.*)</title>")
         -- If the subject changed then break out of the loop
-        if title ~= nil and title ~= cfg.feed[2] .. cfg.user then
+        if title ~= nil and not string.find(title, feed[2]) then
             -- Check if we should scroll, or maybe truncate
             if warg then
                 if type(warg) == "table" then