A source code history analyzer API



Metior is a source code history analyzer API that provides various statistics about a source code repository and its change over time.

Currently Metior provides support for Git and GitHub repositories.

If you're interested in Metior, feel free to join the discussion on Convore in Metior's group.


The most straightforward use of Metior is probably generating an out-of-the-box report that analyzes a repository and gives a user-friendly output of the gathered data.

Metior.report :git, '~/open-source/metior', './reports/metior'
Metior.report :github, 'koraktor/metior', './reports/metior'

API Examples

If you want more sophisticated access to the available data, you can use the low-level API that provides stats for repositories and their individual commits and actors.

One-liner for some basic statistics

Metior.simple_stats :git, '~/open-source/metior'
Metior.simple_stats :github, 'koraktor/metior'

Create a repository object for different VCSs

repo = Metior.repository :git, '~/open-source/metior'
repo = Metior.repository :github, 'koraktor/metior'

More fine-grained access to repository statistics

repo.commits 'development'         # Get all commits in branch development
repo.file_stats                    # Basic statistics about the files
                                   # contained in a repository
repo.line_history                  # Quick access to lines added and
                                   # removed in each commit
repo.significant_authors           # Get up to 3 of the most important
                                   # authors
repo.significant_commits           # Get up to 3 of the commits changing
                                   # the most lines
repo.authors('master').top 5       # Get the top 5 authors in master

Query a collection of commits

repo.commits.after '05/29/2010'
repo.commits.before '05/29/2010'
repo.commits.by 'koraktor'
repo.commits.changing 'lib/metior.rb'
repo.commits.most_significant 10
repo.commits.with_impact 100

See documentation of {Metior::CommitCollection}

Query a collection of actors

repo.authors.most_significant 10
repo.authors.top 10

See documentation of {Metior::ActorCollection}

Advanced usage

Chain collection querys

Querys on a collection of commits or actors can be easily chained to achieve complex filters on the available data.

repo.commits.by('koraktor').after('05/29/2010').with_impact 100
repo.authors.top(10).commits.changing 'lib/metior.rb'

Specifying commit ranges

Usually, when Metior queries a repository for its commits and authors it will use the default branch of the VCS, e.g. master for Git.

Sometimes it's more useful to not analyze the whole history of a repository's branch. For example when analyzing the changes from one branch to another, or from the last released version to the latest code. In that case you will have to specify a commit range. Specifying a commit range works just like in Git:


Given that your currently checked out branch is development and master points to commit deadbeef, the above statements are equal. Please also note the different syntaxes: The first two example are standard strings which will be parsed by Metior. The other one is a Ruby Range object which can be used by Metior right away.


  • Grit — a Ruby API for Git
  • Octokit — a Ruby wrapper for the GitHub API


The documentation of the Ruby API can be seen at RubyDoc.info. The API documentation of the current development version is also available there.

Future plans

  • Provide more reports
  • Generation of reports in formats other than HTML
  • Support for creating graphs
  • Console and web application to accompany this API
  • More supported VCSs, like Subversion or Mercurial
  • Code analysis to show programming languages, effective lines of code, etc.


Metior is a open-source project. Therefore you are free to help improving it. There are several ways of contributing to Metior's development:

  • Build apps using it and spread the word.
  • Report problems and request features using the issue tracker.
  • Write patches yourself to fix bugs and implement new functionality.
  • Create a Metior fork on GitHub and start hacking. Extra points for using feature branches and GitHub's pull requests.

About the name

The latin word "metior" means "I measure". That's just what Metior does – measuring source code histories.


This code is free software; you can redistribute it and/or modify it under the terms of the new BSD License. A copy of this license can be found in the LICENSE file.


  • Sebastian Staudt – koraktor(at)gmail.com
  • Alex Manelis – amanelis(at)gmail.com
  • Michael Klishin – michaelklishin(at)me.com

See Also

Follow Metior on Twitter @metiorstats.