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Ohloh's source code line counter.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License Version 2 as published by the Free Software Foundation.


Ohcount is specifically licensed under GPL v2.0, and no later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see


Ohcount is a library for counting lines of source code. It was originally developed at Ohloh, and is used to generate the reports at

Ohcount supports multiple languages within a single file: for example, a complex HTML document might include regions of both CSS and JavaScript.

Ohcount has two main components: a detector which determines the primary language family used by a particular source file, and a parser which provides a line-by-line breakdown of the contents of a source file.

Ohcount includes a command line tool that allows you to count individual files or whole directory trees. It also allows you to find source code files by language family, or to create a detailed annotation of an individual source file.

Ohcount includes a Ruby binding which allows you to directly access its language detection features from a Ruby application.

System Requirements

Ohcount is supported on Ubuntu 18.04 LTS. It has also been tested on Fedora 29. Other unix-like environments should also work, but your mileage may vary.

Ohcount does not support Windows.

Source Code

Ohcount source code is available as a Git repository:

git clone git://

Building Ohcount

Last updated: 2020-02-12

Ohcount targets Ruby 2.*. The ruby dev headers provided by Ubuntu/Fedora package managers were found to be missing a config.h header file. If the default ruby and ruby-dev packages do not work, install ruby using brew/rbenv/asdf/rvm, which work reliably with ohcount.

You will need ragel 7.0 or higher, bash, gperf, libpcre3-dev, libmagic-dev, gcc(version 7.3 or greater) and swig (>=3.0.0). For older gcc versions one could try this fix.

$ git clone git://
$ cd ohcount

For the ruby bindings, there is a dependency for the 'test-unit' gem:

$ gem install test-unit


$ sudo apt-get install libpcre3 libpcre3-dev libmagic-dev gperf gcc ragel swig
$ ./build


$ sudo dnf install gcc file-devel gperf ragel swig pcre-devel
$ ./build


$ brew install libmagic pcre ragel swig
$ ./build

Other Unix systems

  • If build fails with a missing error and any ruby/x86.../ folder has the file, copy it to ruby/ folder.

Using Ohcount

Once you've built ohcount, the executable program will be at bin/ohcount. The most basic use is to count lines of code in a directory tree. run:

$ bin/ohcount

Ohcount support several options. Run ohcount --help for more information.

Building Ruby and Python Libraries

To build the ruby wrapper:

$ ./build ruby

To build the python wrapper, run

$ python python/ build
$ python python/ install

The python wrapper is currently unsupported.