Added custom bash prompt, based on the 'my' theme.

This colors the arrow at the start of the second line based on the exit
code of the last command: green for 0, red for non-zero

This functionality currently fails when the 'fasd' plugin is enabled,
since it is messing with the PROMPT_COMMAND function.

themes/nwinkler/nwinkler.theme.bash

@@ -0,0 +1,47 @@
+#!/bin/bash
+
+# Two line prompt showing the following information:
+# (time) SCM [username@hostname] pwd (SCM branch SCM status) 
+# → 
+#
+# Example:
+# (14:00:26) ± [foo@bar] ~/.bash_it (master ✓) 
+# → 
+#
+# The arrow on the second line is showing the exit status of the last command:
+# * Green: 0 exit status
+# * Red: non-zero exit status
+#
+# The exit code functionality currently doesn't work if you are using the 'fasd' plugin,
+# since 'fasd' is messing with the $PROMPT_COMMAND
+
+
+PROMPT_END_CLEAN="${green}→${reset_color}"
+PROMPT_END_DIRTY="${red}→${reset_color}"
+
+function prompt_end() {
+  echo -e "$PROMPT_END"
+}
+
+prompt_setter() {
+  local exit_status=$?
+  if [[ $exit_status -eq 0 ]]; then PROMPT_END=$PROMPT_END_CLEAN
+    else PROMPT_END=$PROMPT_END_DIRTY
+  fi
+  # Save history
+  history -a
+  history -c
+  history -r
+  PS1="(\t) $(scm_char) [${blue}\u${reset_color}@${green}\H${reset_color}] ${yellow}\w${reset_color}$(scm_prompt_info) ${reset_color}\n$(prompt_end) "
+  PS2='> '
+  PS4='+ '
+}
+
+PROMPT_COMMAND=prompt_setter
+
+SCM_THEME_PROMPT_DIRTY=" ${bold_red}✗${normal}"
+SCM_THEME_PROMPT_CLEAN=" ${bold_green}✓${normal}"
+SCM_THEME_PROMPT_PREFIX=" ("
+SCM_THEME_PROMPT_SUFFIX=")"
+RVM_THEME_PROMPT_PREFIX=" ("
+RVM_THEME_PROMPT_SUFFIX=")"