Closure over the local variables by wrapping everything in a anonymous function

Also namespace all the functions as they will always be global

pure.zsh

@@ -17,6 +17,8 @@
 # %m => shortname host
 # %(?..) => prompt conditional - %(condition.true.false)
 
+
+() {
 	autoload -Uz add-zsh-hook
 	autoload -Uz vcs_info
 
@@ -34,7 +36,7 @@ setopt PROMPT_SUBST
 	[ $USER != "$PURE_DEFAULT_USERNAME" ] && local username='%n@%m '
 
 	# fastest possible way to check if repo is dirty
-git_dirty() {
+	pure_git_dirty() {
 		# check if we're in a git repo
 		command git rev-parse --is-inside-work-tree &>/dev/null || return
 		# check if it's dirty
@@ -42,7 +44,7 @@ git_dirty() {
 	}
 
 	# displays the exec time of the last command if set threshold was exceeded
-cmd_exec_time() {
+	pure_cmd_exec_time() {
 		local stop=`date +%s`
 		local start=${cmd_timestamp:-$stop}
 		let local elapsed=$stop-$start
@@ -56,7 +58,7 @@ pure_preexec() {
 	pure_precmd() {
 		vcs_info
 		# add `%*` to display the time
-	print -P '\n%F{blue}%~%F{8}$vcs_info_msg_0_`git_dirty` $username%f %F{yellow}`cmd_exec_time`%f'
+		print -P '\n%F{blue}%~%F{8}$vcs_info_msg_0_`pure_git_dirty` $username%f %F{yellow}`pure_cmd_exec_time`%f'
 		# reset value since `preexec` isn't always triggered
 		unset cmd_timestamp
 	}
@@ -65,3 +67,4 @@ pure_precmd() {
 	PROMPT='%(?.%F{magenta}.%F{red})❯%f '
 	# can be disabled:
 	# PROMPT='%F{magenta}❯%f '
+}