themes: Add "half-life" theme

themes/THEMES.md

@@ -95,6 +95,10 @@
 
 [![](gallifrey/gallifrey-dark.png)](gallifrey/gallifrey-dark.png)
 
+## `half-life`
+
+[![](half-life/half-life.theme.png)](half-life/half-life.theme.png)
+
 ## `hawaii50`
 
 [![](hawaii50/hawaii50-dark.png)](hawaii50/hawaii50-dark.png)

themes/half-life/half-life.theme.sh

@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+
+OSH_THEME_GIT_PROMPT_DIRTY="✗"
+OSH_THEME_GIT_PROMPT_CLEAN="✓"
+
+# Nicely formatted terminal prompt
+ps_scm_prompt() {
+  CHAR=$(scm_char)
+  if [ $CHAR = $SCM_NONE_CHAR ]
+    then
+      return
+    else
+      echo " on ${blue}$(git_current_branch)$(parse_git_dirty)${normal} "
+  fi
+}
+
+function prompt_command() {
+  ps_username="${purple}\u${normal}"
+  ps_path="${green}\w${normal}"
+  ps_user_mark="${orange}λ${normal}"
+
+  PS1="$ps_username in $ps_path$(ps_scm_prompt) $ps_user_mark "
+}
+
+
+safe_append_prompt_command prompt_command