Merge branch 'jburwell/jenv-plugin'

Closes #3406
Closes #4972
Closes #4523
Closes #5964

lib/prompt_info_functions.zsh

@@ -12,7 +12,7 @@
 # Real implementations will be used when the respective plugins are loaded
 function chruby_prompt_info hg_prompt_info pyenv_prompt_info \
   rbenv_prompt_info svn_prompt_info vi_mode_prompt_info \
-  virtualenv_prompt_info {
+  virtualenv_prompt_info jenv_prompt_info {
   return 1
 }
 

plugins/jenv/README.md

+# jenv oh-my-zsh plugin
+
+[jenv](http://www.jenv.be/) is a Java version manager similiar to [rbenv](http://rbenv.org/) and [pyenv]|(https://github.com/yyuu/pyenv).  This plugin initializes jenv and adds provides the jenv_prompt_info function to add Java version information to prompts.

plugins/jenv/jenv.plugin.zsh

+jenvdirs=("$HOME/.jenv" "/usr/local/jenv" "/opt/jenv")
+
+FOUND_JENV=0
+for jenvdir in $jenvdirs; do
+    if [[ -d "${jenvdir}/bin" ]]; then
+        FOUND_JENV=1
+        break
+    fi
+done
+
+if [[ $FOUND_JENV -eq 0 ]]; then
+    if (( $+commands[brew] )) && jenvdir="$(brew --prefix jenv)"; then
+        FOUND_JENV=1
+    fi
+fi
+
+if [[ $FOUND_JENV -eq 1 ]]; then
+    export PATH="${jenvdir}/bin:$PATH"
+    eval "$(jenv init - zsh)"
+
+    function jenv_prompt_info() { jenv version-name 2>/dev/null }
+
+    if [[ -d "${jenvdir}/versions" ]]; then
+        export JENV_ROOT=$jenvdir
+    fi
+else
+    function jenv_prompt_info() { echo "system: $(java -version 2>&1 | cut -f 2 -d ' ')" }
+fi
+
+unset jenvdir FOUND_JENV