Add shitty and half-finished powerline inspired zsh prompt theme

shell/zsh/custom/powerline-arrow.zsh-theme

@@ -0,0 +1,50 @@
+# A script to make using 256 colors in zsh less painful.
+# P.C. Shyamshankar <sykora@lucentbeing.com>
+# https://github.com/sykora/etc/blob/master/zsh/functions/spectrum/
+
+typeset -Ag FX FG BG
+
+FX=(
+    reset     ""
+    bold      "" no-bold      ""
+    italic    "" no-italic    ""
+    underline "" no-underline ""
+    blink     "" no-blink     ""
+    reverse   "" no-reverse   ""
+)
+
+for color in {000..255}; do
+    FG[$color]="[38;5;${color}m"
+    BG[$color]="[48;5;${color}m"
+done
+
+
+#
+# Powerline-Arrow theme
+#
+
+PROMPT='%n@%m %{$FG[000]%}%{$BG[235]%}⮀%{$reset_color%}%{$BG[235]%} %~ $(check_git_prompt_info)%{$reset_color%} $ '
+
+local return_code="%(?..%{$fg[cyan]%}%? ↵%{$reset_color%})"
+RPROMPT="${return_code}"
+
+ZSH_THEME_GIT_PROMPT_PREFIX="%{$FG[236]%}%{$BG[237]%}⮀ %{$FG[014]%}"
+ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}%{$FG[238]%}⮀%{$reset_color%}"
+ZSH_THEME_GIT_PROMPT_DIRTY="%{$FG[001]%}*%{$reset_color%}"
+ZSH_THEME_GIT_PROMPT_CLEAN=" "
+
+
+# Git sometimes goes into a detached head state. git_prompt_info doesn't
+# return anything in this case. So wrap it in another function and check
+# for an empty string. -- Brorrowed from Soliah.zsh-theme :)
+function check_git_prompt_info() {
+  if git rev-parse --git-dir > /dev/null 2>&1; then
+    if [[ -z $(git_prompt_info) ]]; then
+      echo "%{$fg[cyan]%}(detached%{$fg[magenta]%}*%{$fg[cyan]%})%{$reset_color%}"
+    else
+      echo "$(git_prompt_info)"
+    fi
+  else
+    echo "%{$reset_color%}%{$FG[236]%}⮀"
+  fi
+}