Close sindresorhusGH-67: provide arrows for push and pull.

pure.zsh

@@ -80,10 +80,12 @@ prompt_pure_precmd() {
 		# check check if there is anything to pull
 		command git fetch &>/dev/null &&
 		# check if there is an upstream configured for this branch
-		command git rev-parse --abbrev-ref @'{u}' &>/dev/null &&
-		(( $(command git rev-list --right-only --count HEAD...@'{u}' 2>/dev/null) > 0 )) &&
-		# some crazy ansi magic to inject the symbol into the previous line
-		print -Pn "\e7\e[A\e[1G\e[`prompt_pure_string_length $prompt_pure_preprompt`C%F{cyan}⇣%f\e8"
+		command git rev-parse --abbrev-ref @'{u}' &>/dev/null && {
+			local arrows=''
+			(( $(command git rev-list --right-only --count HEAD...@'{u}' 2>/dev/null) > 0 )) && arrows='⇣'
+			(( $(command git rev-list --left-only --count HEAD...@'{u}' 2>/dev/null) > 0 )) && arrows+='⇡'
+			print -Pn "\e7\e[A\e[1G\e[`prompt_pure_string_length $prompt_pure_preprompt`C%F{cyan}${arrows}%f\e8"
+		}
 	} &!
 
 	# reset value since `preexec` isn't always triggered