script.py

#!/usr/bin/env python

# Creates a LaunchAgent for local-npm, or does nothing
# if it's already installed.

import os, sys, getpass, subprocess

def command(cmd):
  print(cmd)
  os.system(cmd)

def finished():
  print("\nIf you want to switch back to normal npm, run:\n\n    npmrc default\n")
  print("If you want to see replication progress, run:\n\n    pm2 logs all\n")
  print("If you want to uninstall, run:\n\n    launchctl unload ~/Library/LaunchAgents/com.nolanlawson.localnpm.plist\n")

install_dir = os.path.expanduser('~/.local-npm')
if not os.path.exists(install_dir):
  os.mkdir(install_dir)

done_file = os.path.join(install_dir, 'done')
if os.path.exists(done_file):
  print("\nLooks like local-npm is already installed! Exiting.")
  finished()
  sys.exit(1)

command('sudo npm install -g local-npm pm2 npmrc')

plist = '''<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>com.nolanlawson.localnpm</string>
    <key>ProgramArguments</key>
    <array>
      <string>%s</string>
      <string>%s</string>
      <string>start</string>
      <string>%s</string>
      <string>--</string>
      <string>%s</string>
    </array>
    <key>RunAtLoad</key>
    <true/>
    <key>KeepAlive</key>
    <false/>
    <key>StandardErrorPath</key>
    <string>/tmp/localnpm.err</string>
    <key>StandardOutPath</key>
    <string>/tmp/localnpm.out</string>
    <key>UserName</key>
    <string>%s</string>
    <key>WorkingDirectory</key>
    <string>%s</string>
  </dict>
</plist>'''

plist = plist % (\
  subprocess.call('which node'.split()), \
  subprocess.call('which pm2'.split()), \
  subprocess.call('which node'.split()), \
  subprocess.call('which local-npm'.split()), \
  getpass.getuser(), \
  install_dir)

out_file = open(os.path.expanduser('~/Library/LaunchAgents/com.nolanlawson.localnpm.plist'), 'w')
out_file.write(plist)
out_file.close()

command('launchctl load -w ~/Library/LaunchAgents/com.nolanlawson.localnpm.plist')

command('npmrc -c local')
os.system('npm set registry http://127.0.0.1:5080')

open(done_file, 'a').close()

print("\nDone! You now have local-npm running at 127.0.0.1:5080")
print("You also have an npmrc called \"local\" configured to point to it.")
print("All offline data is stored in ~/.local-npm")
finished()