Adding plugin node-modules-path

If chpwd is changed to a path where any folder within that subpath
contains a node_modules folder, then that path + .bin is added to the
PATH env variable.

The reason for writing this plugin is that I often open up atom directly
from the shell in a directory of interest. If I have flow installed
locally then I have to add the node_modules folder in that path to PATH
before I open up Atom.

plugins/node-modules-path/node-modules-path.plugin.zsh

@@ -0,0 +1,39 @@
+SCRIPT_PATH=${0:a:h}
+NODE_MODULES_PATH=""
+
+# Removes applied path from PATH.
+function remove_from_path {
+  PATH=${PATH/":$1"/}
+  PATH=${PATH/"$1:"/}
+}
+
+# Checks if given string is found in PATH.
+function is_on_path {
+  if [[ "$1" ]]; then
+    echo $PATH | grep "$1" >/dev/null
+  else
+    return 1
+  fi
+}
+
+chpwd_handler() {
+  nearest_found_nm=`/usr/bin/env python $SCRIPT_PATH/path_check.py $PWD`
+
+  if [[ "$nearest_found_nm" ]] && is_on_path "$nearest_found_nm/node_modules/.bin"; then
+    return
+  fi
+
+  if [[ "$NODE_MODULES_PATH" ]]; then
+    remove_from_path "$NODE_MODULES_PATH/node_modules/.bin"
+    export NODE_MODULES_PATH=""
+  fi
+
+  if [[ "$nearest_found_nm" ]]; then
+    echo "\033[1;34mFound node_modules in $nearest_found_nm, adding to path\033[0m"
+    PATH="$PATH:$nearest_found_nm/node_modules/.bin"
+    NODE_MODULES_PATH="$nearest_found_nm"
+  fi
+}
+
+chpwd_functions=(${chpwd_functions[@]} "chpwd_handler")
+chpwd_handler