#Dart Pub packages dependency finder

This is a command line tool that will help you find all packages in Pub that have a given dependency.

##Usage

This script is written in Dart so you'll need Dart installed. You run it using the following command:

dart dependency_finder.dart <package_name> [--skip-downloads]

Where:

• <package_name> Is the name if the dependency package you are looking for dependents of.
• --skip-downloads This will skip downloading the latest version of all packages. You can use that on subsequent searches to avoid re-downloading everything (which is the slow part).

##Example usage

This is an example we'll explain later:

dart dependency_finder.dart js

This will list all packages in Dart Pub that have a dependency on the package:js library in Pub. We do that by:

• Fetching the list of all existing packages
• Looking for what is their latest version
• Downloading the latest version of each Pub packages archive
• Extracting the pubspec.yaml file out of all package archives
• Looking for the js dependency in the pubspec.yaml

In this particular example the output would be:

computername:bin username$ dart dependency_finder.dart js
Listing all packages... 1181 - Done.
Finding last versions of each packages... 1181/1181 - Done.
Downloading packages... 1181/1181 - Done.
Analyzing packages... 1181/1181
All Done! Found 26 packages with packages:js dependency:
 - add_v1_api-0.1.0
 - aloha-2.0.0
 - dancer-0.4.0+4
 - dartwork-0.1.0
 - diffbot-0.1.1
 - form_elements-1.1.0
 - google_adsense_v1_1_api-0.3.8
 - google_adsense_v1_api-0.3.8
 - google_compute_v1beta12_api-0.1.0
 - google_compute_v1beta13_api-0.1.6
 - google_compute_v1beta14_api-0.3.8
 - google_dynamiccreatives_v1_api-0.1.1
 - google_latitude_v1_api-0.3.8
 - google_plus_v1moments_api-0.1.0
 - google_plus_widget-0.0.1
 - haml-0.0.1
 ...

Now lets say you also want to know which packages have a dependency on the yaml package you can run the following command:

dart dependency_finder.dart yaml --skip-downloads

This will be a lot faster than the first run because the script won't download all repos and just start looking into the pubspec.yaml files. Here is what the output would look like:

computername:bin username$ dart dependency_finder.dart yaml --skip-downloads
Analyzing packages... 1181/1181
All Done! Found 25 packages with packages:yaml dependency:
 - activemigration-0.2.2
 - ccompile-0.2.2
 - compiler-0.3.0
 - dart_config-0.5.0
 - docgen-0.9.0
 - FileTeCouch-0.1.0
 - flare-0.3.0
 - force_it-0.3.0
 - package_installer-0.0.2
 - ped-0.0.4
 - peg-0.0.9
 - plugins-1.0.1
 - polymer-0.9.5+2
 - polymer_one_script-0.0.1
 ...

##Disclaimer

Even though contributors for this project are working for Google this is not an official Google Product. This is an open-source sample script written in Dart.

##License

Apache 2.0 Copyright 2014 Google Inc