Added alias expansion and fixed README

Set PATH variables to allow gems such as Bundler to be found and for the
`ruby-info` function to properly work.

A default Ruby must be set in ~/.ruby-version; for more information, see
https://github.com/postmodern/chruby#default-ruby.

Signed-off-by: Sorin Ionescu <sorin.ionescu@gmail.com>

modules/explainshell/README.md

@@ -0,0 +1,11 @@
+#Explainshell
+
+Adds a keybinding and a function to open 
+[explainshell.com](http://www.explainshell.com) with the content of the command
+line.
+
+##Settings
+###Key-Binding
+The keybinding to open [explainshell.com](http://www.explainshell.com)
+
+`zstyle ':prezto:module:explainshell' key-binding '^K'`

modules/explainshell/init.zsh

@@ -0,0 +1,63 @@
+#
+# Adds a explain function and explainshell widget
+# 
+# Authors
+#   C Lentfort
+#
+
+function _expand_alias_recursive {
+  local _alias
+  for word in "$@"; do
+    # Check if word is aliased
+    _alias=$aliases[$word]
+    if [ -n "$_alias" ]; then
+      # Check if found alias and given command are identical
+      if [[ "$_alias" != "${(j: :)@}" ]]; then
+        _expand_alias_recursive "${(z)_alias}"
+      else
+        _explainshell_expanded_buffer+=$1
+      fi
+    else
+      _explainshell_expanded_buffer+=$word
+    fi
+  done
+}
+
+function explain {
+  local url
+  # We don't explain empty buffers
+  if (( $# == 0 )); then
+    return 1;
+  fi
+
+  # Replace aliases with their actual expansions
+  _explainshell_expanded_buffer=()
+  _expand_alias_recursive $@
+  _explainshell_expanded_buffer=(${(u)_explainshell_expanded_buffer})
+  # base url with first command already injected
+  # $ explain tar
+  #   => http://explainshel.com/explain/tar?args=
+  url="http://explainshell.com/explain?cmd="
+
+  # iterates over remaining args and adds builds the rest of the url
+  for i in "$_explainshell_expanded_buffer"; do
+    url=$url"$i""+"
+  done
+
+  unset _explainshell_expanded_buffer
+  # opens url in browser
+  $BROWSER -t $url &> /dev/null
+}
+
+function explainshell {
+  explain ${(z)BUFFER}
+}
+
+zle -N explainshell
+
+zstyle -s ':prezto:module:explainshell' key-binding 'key_binding'
+if [[ -n "$key_binding" ]]; then
+  bindkey "$key_binding" explainshell
+fi
+
+unset key_binding

modules/ruby/init.zsh

@@ -28,6 +28,9 @@ elif (( $+commands[chruby-exec] )); then
   source "${commands[chruby-exec]:h:h}/share/chruby/chruby.sh"
   if zstyle -t ':prezto:module:ruby:chruby' auto-switch; then
     source "${commands[chruby-exec]:h:h}/share/chruby/auto.sh"
+
+    # If a default Ruby is set, switch to it.
+    chruby_auto
   fi
 
 # Prepend local gems bin directories to PATH.

modules/ssh/README.md

@@ -4,7 +4,8 @@ SSH
 Provides for an easier use of [SSH][1] by setting up [ssh-agent][2].
 
 This module is disabled on Mac OS X due to custom Apple SSH support rendering it
-unnecessary.
+unnecessary. Use `ssh-add -K` to store identities in Keychain; they will be
+added to `ssh-agent` automatically and persist between reboots.
 
 Settings
 --------