refactor themes to support standardized clock functions

themes/luan/luan.theme.bash

@@ -1,4 +1,5 @@
 #!/usr/bin/env bash
+
 SCM_THEME_PROMPT_DIRTY=" ${red}✗"
 SCM_THEME_PROMPT_CLEAN=" ${bold_green}✓"
 SCM_THEME_PROMPT_PREFIX="(${yellow}"
@@ -13,7 +14,7 @@ RVM_THEME_PROMPT_PREFIX=""
 RVM_THEME_PROMPT_SUFFIX=""
 
 function prompt_command() {
-    dtime="${yellow}\T${normal}"
+    dtime="$(clock_prompt)"
     user_host="${green}\u@${cyan}\h${normal}"
     current_dir="${bold_blue}\w${normal}"
     rvm_ruby="${bold_red}$(ruby_version_prompt)${normal}"
@@ -22,8 +23,11 @@ function prompt_command() {
     arrow="${bold_white}▶${normal} "
     prompt="${bold_green}\$${normal} "
 
-    PS1="${dtime} ${user_host}:${current_dir} ${rvm_ruby} ${git_branch}
+    PS1="${dtime}${user_host}:${current_dir} ${rvm_ruby} ${git_branch}
       $arrow $prompt"
 }
 
+THEME_CLOCK_COLOR=${THEME_CLOCK_COLOR:-"$yellow"}
+THEME_CLOCK_FORMAT=${THEME_TIME_FORMAT:-"%I:%M:%S "}
+
 safe_append_prompt_command prompt_command