If the first line of a commit message is longer than 50 characters,
truncate it before adding the resulting string to the subject line of a
notification. This makes sure the subject line won't get too long
(unless the commit author name is unusually long, which we don't check).
The Git User's Manual recommends keeping the first line of a commit
message shorter than that, anyway:
| Though not required, it's a good idea to begin the commit message with
| a single short (less than 50 character) line summarizing the change,
| followed by a blank line and then a more thorough description. Tools
| that turn commits into email, for example, use the first line on the
| Subject line and the rest of the commit in the body.
[ http://www.kernel.org/pub/software/scm/git/docs/user-manual.html ]
Do not only generate notifications on commits, but also if a branch head
or lightweight tag was created, removed, or modified. Notifications on
branch head updates are omitted if one or more commit notification have
been generated and the branch head now references a descendant of the
originally referenced commit (which should be the usual case).
Most notifications include an ASCII "table" with two columns. The
formatting of these columns is now handled by the new format_table()
subroutine, so that the alignment can easily be changed in the future.
The code which handles notifications regarding tags was unused, as only
objects listed by git-rev-list(1) are considered, and git-rev-list(1)
never spits out the sha1 of a tag object.
Import the (self-written) git-update-mirror script, which updates clones
of Git repositories and then calls git-notify (in just the same way as a
post-receive hook would be called by Git). The git-notify script is
imported from git://source.winehq.org/git/tools.git (commit: 03d66f34)
and generates notifications on repository changes. We'll use these
scripts for generating our commit e-mails.
