Node.js Helpers

Add helper function to open node api in browser. Add binaries installed via
npm to path. Tell node where to find things (what things?).

plugins/node/node.plugin.zsh

+# This works if you installed node via homebrew.
+export NODE_PATH="/usr/local/lib/node"
+
+# Open the node api for your current version to the optional section.
+# TODO: Make the section part easier to use.
+function node-api {
+	open "http://nodejs.org/docs/$(node --version)/api/all.html#$1"
+}

plugins/npm/npm.plugin.zsh

+# TODO: Don't do this in such a weird way.
+export PATH=`echo $PATH | sed -e 's|/usr/bin|/usr/local/share/npm/bin:&|'`