Tutorial :How many people were involved in a project? Based on Revision Control System



Question:

How do you know how many developers were involved in a project using a Revision Control System? A friend of mine found this way to look up the answer in git log:

git log | grep Author: | sort -u | cut â€"delimiter=” ” -f2 | sort -u | wc -l  

Is there a straightforward way in git? How about other Revision Control System like Subversion, Bazaar or Mercurial?


Solution:1

git

The shortlog command is very useful. This summarizes the typical git-log output.

$ git shortlog -sn     119  tsaleh     113  Joe Ferris      70  Ryan McGeary      45  Tammer Saleh      45  Dan Croak      19  Matt Jankowski      ...  

Pass to wc to see the number of unique usernames:

$ git shortlog -sn | wc -l        40  


Solution:2

For mercurial, there's an extension to do exactly that: hg churn.

hg churn sorts by line-changed, if you want changeset count, use hg churn -c.


Solution:3

For subversion

svn log -q svn://path/to/repo | cut -f 3 -d " "  | sort -u  


Solution:4

There is stats plugin for Bazaar to get different info about project contributors:

https://launchpad.net/bzr-stats/


Solution:5

I'm not aware of a straightforward way for Mercurial either and a good search of all its documentation didn't revealed anything too. So, here's a *nix command, similar to the one your friend found, for Mercurial:

hg log | grep user: | cut -c 14- | sort -u | uniq | wc -l  

BTW, I think there's an error with the command for git, the second sort -u should surely be replaced by uniq!


Solution:6

A simpler git version is:

git log --pretty=tformat:%an | sort -u | wc -l  

or if you care about unique email addresses:

git log --pretty=tformat:%ae | sort -u | wc -l  


Solution:7

Mercurial has a powerful template language built-in (see hg help templates). So you can get a list of all people in the project without enabling the churn extension:

hg log --template '{author}\n' | sort -u  

If people have changed their email address (but otherwise kept their name the same), then you can process the author template keyword a bit:

hg log --template '{author|person}\n' | sort -u  

Then add wc -l as appropriate to the above commands.


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