node_modules.sh

#!/bin/sh
# File formatted with shell-format.
#
# This tool creates a disk image to put node_modules in. This makes it so that
# when the disk image is not mounted, it is treated as a single file by
# Spotlight and other tools to do expensive tasks on a per-file basis.

set -e

# Utils

self_name() {
  if [ "$(dirname "$0")" = "$PWD" ]; then
    echo "./$(basename "$0")"
  else
    echo "$0"
  fi
}

test_line_exists_in_file() {
  local line="$1"
  local file="$2"
  grep -qFx "$line" "$file"
}

test_has_dir_x_access() {
  local dir="$1"
  ls -1 "$dir" >/dev/null 2>/dev/null
}

# Commands

init() {
  test -f 'node_modules.sparseimage' ||
    hdiutil create -size '1G' -type 'SPARSE' -volname 'node_modules' 'node_modules.sparseimage'
  test_line_exists_in_file '/node_modules.sparseimage' '.git/info/exclude' ||
    echo >>'.git/info/exclude' '/node_modules.sparseimage'

  echo 'Initialized node_modules.sparseimage.'

  create_placeholder
}

mount() {
  hdiutil attach 'node_modules.sparseimage' -mountpoint 'node_modules' -nobrowse -quiet
}

create_placeholder() {
  if ! test -e 'node_modules'; then
    mkdir 'node_modules' &&
      chmod -x 'node_modules'
    echo 'Created placeholder node_modules dir.'
  fi

}

migrate() {
  unmount || true

  if test_has_dir_x_access 'node_modules'; then
    mv 'node_modules' 'node_modules-being-migrated' &&
      mount &&
      ditto 'node_modules-being-migrated' 'node_modules' &&
      rm -rf 'node_modules-being-migrated' &&
      unmount
  else
    echo "There is no node_modules dir to migrate."
  fi

  create_placeholder
}

unmount() {
  hdiutil detach 'node_modules' -quiet
}

case "$1" in
init) init ;;
mount) mount ;;
migrate) migrate ;;
unmount) unmount ;;
*) echo "Usage: $(self_name) [init | mount | migrate | unmount]" ;;
esac

Moved to https://github.com/szhu/nmg.