syntax highlighting! automatically!

zsh/.config/zsh/config.d/40_highlighting.zsh

@@ -0,0 +1,45 @@
+# where to look for the syntax highlighting repo
+targetdir="$HOME/src/github.com/zsh-users/zsh-syntax-highlighting"
+# if this file exists, do not attempt to load the highlight module
+nohighlightfile="$HOME/.config/zsh/.nohighlight"
+
+# loads the highlighter
+function load_highlight {
+	source "$targetdir/zsh-syntax-highlighting.zsh"
+}
+
+function confirm {
+	while true; do
+		read "answer?$* [(yes)/no]: "
+		case $answer in
+			[Yy]|yes|"")
+				return 0
+				;;
+			[Nn]|no)
+				return 1
+				;;
+		esac
+	done
+}
+
+# only proceed if we haven't opted out
+if [ ! -e "$nohighlightfile" ]; then
+	# attempt to load the highlighter if the repo exists
+	if [ -d "$targetdir" ]; then
+		load_highlight
+	else
+		# if it isn't found, offer to clone it automatically
+		echo "zsh-syntax-highlighting not found."
+		if confirm "Clone from git into $targetdir?"; then
+			mkdir -p "$targetdir"
+			git clone https://github.com/zsh-users/zsh-syntax-highlighting.git "$targetdir"
+			load_highlight
+			clear
+		else
+			# we don't want highlighting, don't ask about it again
+			mkdir -p "$(dirname $nohighlightfile)"
+			touch "$nohighlightfile"
+			echo "If you change your mind, delete $nohighlightfile and I'll ask again on your next session."
+		fi
+	fi
+fi