List of installed gems

Question

Is there a Ruby method I can call to get the list of installed gems   I  want to parse the output of gem list   Is there a different way to do this

User · Answer

Try it in the terminal   ruby -S gem list --local

User · Answer

A more modern version would be to use something akin to the following     require  rubygems  puts Gem  Specification all   map  g   g name  g version to s  join  -       NOTE  very similar the first part of an answer by Evgeny    but due to page formatting  it s easy to miss

User · Answer

use this code  in console mode    Gem  Specification all names

User · Answer

This lists all the gems I have installed   gem query --local   http   guides rubygems org command-reference  gem-list  See 2 7 Listing all installed gems

User · Answer

Maybe you can get the files  gems  from the gems directory   gemsdir    gems directory  gems   Dir new gemsdir  entries

User · Answer

Gem  Specification map   a  a name    However  if your app uses Bundler it will return only list of dependent local gems  To get all installed   def all installed gems    Gem  Specification all   nil        all   Gem  Specification map  a  a name       Gem  Specification reset    all end

User · Answer

Here s a really nice one-liner to print all the Gems along with their version  homepage  and description   Gem  Specification sort  a b  a name  lt   gt  b name  map   a  puts    a name     a version     puts  -    50  puts a homepage  puts a description  puts   n n   nil

User · Answer

From within your debugger type  LOAD PATH to get a list of your gems  If you don t have a debugger  install pry   gem install pry pry Pry main  gt   LOAD PATH   This will output an array of your installed gems

User · Answer

There s been a method for this for ages   ruby -e  puts Gem  Specification all names

User · Answer

Both  gem query --local   and   ruby -S gem list --local   list 69 entries  While  ruby -e  puts Gem  Specification all names    gives me 82  I used wc -l to get the numbers  Not sure if that is the right way to check  Tried to redirect the output to text files and diff ed but that didn t help - will need to compare manually one by one

User · Answer

The Gem command is included with Ruby 1 9  now  and is a standard addition to Ruby pre-1 9   require  rubygems   name      i dep   Gem  Dependency new name  Gem  Requirement default  specs   Gem source index search dep  puts specs 0  5  map   s     s name    s version        gt  gt  Platform 0 4 0    gt  gt  abstract 1 0 0    gt  gt  actionmailer 3 0 5    gt  gt  actionpack 3 0 5    gt  gt  activemodel 3 0 5    gt  gt  activerecord 3 0 5     Here s an updated way to get a list   require  rubygems   def local gems    Gem  Specification sort by   g   g name downcase  g version    group by   g  g name   end   Because local gems relies on group by  it returns a hash of the gems  where the key is the gem s name  and the value is an array of the gem specifications  The value is an array of the instances of that gem that is installed  sorted by the version number   That makes it possible to do things like   my local gems   local gems    my local gems  actionmailer       gt   Gem  Specification new do  s          s authors     David Heinemeier Hansson           s date   Time utc 2013  12  3          s dependencies    Gem  Dependency new  actionpack             Gem  Requirement new     4 0 2                runtime            Gem  Dependency new  mail             Gem  Requirement new     gt  2 5 4                runtime           s description    Email on Rails  Compose  deliver  receive  and test emails using the familiar controller view pattern  First-class support for multipart email and attachments           s email    david loudthinking com          s homepage    http   www rubyonrails org          s licenses     MIT           s name    actionmailer          s require paths     lib           s required ruby version   Gem  Requirement new    gt   1 9 3            s requirements     none           s rubygems version    2 0 14          s specification version   4         s summary    Email composition  delivery  and receiving framework  part of Rails            s version   Gem  Version new  4 0 2           end    And   puts my local gems map   name  specs            name      specs map   spec  spec version to s   join          join            gt  gt  actionmailer 4 0 2        gt  gt  arel 4 0 1 5 0 0        gt  gt  ZenTest 4 9 5    gt  gt  zucker 13 1   The last example is similar to the gem query --local command-line  only you have access to all the information for a particular gem s specification

[ruby] List of installed gems?

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