Let's play a little, just for the fun of it, and to gather some metainformation about a codebase.
I sometimes would like to find out the commit spans of the different authors. I may not care about the number of commits, but only first and last. This info may be useful to know if a repo has most long time commiters or the majority of contributors are one-off, or one-feature-and-forget.
First we'll sharpen a bit our unix chainsaw:
Here's a little helper that has proven to be very useful. It's similar to uniq, but you don't need to sort first, and also it accepts a parameter meaning the column you want to be unique. (Unique by Column)
function uc () {
awk -F" " "!_[\$$1]++"
}
And then, you only have to look at man git-log to find out you can reverse the order of the logs, so you can track the first and the last appearence of each commiter.
git log --format='%aE %ai' | uc 1 | sort >/tmp/last
git log --reverse --format='%aE %ai -> ' | uc 1 | sort >/tmp/first
paste /tmp/first /tmp/last > /tmp/spans.txt
Here is the output file. it has some spurious parsing errors, but I think it still shows how powerful insights we can get with just a bit of bash, man and pipelines.
Just by chance, the day after I tried this, I discovered
git-quick-stats, which is a utility tool to get simple stats out of a git repo. It's great that I could add the same functionality there too via a
Pull Request :).
Big thanks to every one of the commiters in emacs, being long or short span and amount of code contributed. Thanks to y'all
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