Counting changed lines of code over time

Question

Is there a way to obtain the number of changed lines of code over a certain time period in a mercurial repository? Something along the lines of what statsvn does would be great, but anything counting the number of changed lines of code within 6 months will do (including a clever combination of arguments to hg log).

Answer 1

The hg churn extension is what you want.

You can get visual results with hg activity or hg chart.

Answer 2

Edit: hg diff and hg log both support a --stat option that can do this for you, only better and quicker.

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I made an alias called lines to count changed lines (not necessarily lines of code) for me. Try putting this alias in your .hgrc file:

[alias] lines = !echo `hg log -pr $@ | grep "^+" | wc -l` Additions; echo `hg log -pr $@ | grep "^-" | wc -l` Deletions;  

Then pass it the revision first, followed by any optional arguments:

hg lines tip or hg lines 123:456 -u brian

Sometimes you want to know the number of lines changed excluding whitespace-only changes. This requires using diff -w underneath instead of log -p. I set up a linesw alias for this:

#ignore whitespace linesw = ![[ $1 =~ : ]] && r=$1 || r="$1~1:$1"; echo `hg diff -wr $r | grep "^+\([^+]\|$\)" | wc -l` Additions; echo `hg diff -wr $r | grep "^-\([^-]\|$\)" | wc -l` Deletions;  

hg linesw tip or hg lines 123:456

Note they behave slightly differently because diff and log behave differently -- for example, log will take a --user parameter while diff will not, and when passing a range, log will show changes commited in the first revision given in the range, while diff will not.

This has only been tested using bash.