git: changelog day by day

Question

How to generate changelog of commits groupped by date, in format:

[date today]
- commit message1
- commit message2
- commit message3
...
[date day+3]
- commit message1
- commit message2
- commit message3
...
(skip this day if no commits)

[date day+1]
- commit message1
- commit message2
- commit message3
... 
[date since]
- commit message1
- commit message2
- commit message3

Any git log command, or smart bash script?

Answer 1

git log has --since and --until, it shouldn't be hard to wrap some stuff around that.

Answer 2

That would require most certainly some kind of script.
A bit like this commandline-fu

for k in `git branch|perl -pe s/^..//`;do echo -e `git show --pretty=format:"%Cgreen%ci %Cblue%cr%Creset" $k|head -n 1`\\t$k;done|sort -r

(not exactly what you are after but can gives you an idea nonetheless)

I know about GitStats which has also data organized by date (but not the commit messages)

---

Note: the git branch part of this command is ill-fitted for scripting, as Jakub Narębski comments.
git for-each-ref or git show-ref are natural candidate for scripting commands, being plumbing commands.

Answer 3

Here is dirty, but working version of the script I came up with:

#!/bin/bash
# Generates changelog day by day
NEXT=$(date +%F)
echo "CHANGELOG"
echo ----------------------
git log --no-merges --format="%cd" --date=short | sort -u -r | while read DATE ; do
    echo
    echo [$DATE]
    GIT_PAGER=cat git log --no-merges --format=" * %s" --since=$DATE --until=$NEXT
    NEXT=$DATE
done