Re: Action stamps

[Jason Merrill <jason at redhat dot com>]

On 09/01/2015 05:21 AM, Eric S. Raymond wrote:
> Jason Merrill <jason@redhat.com>:
> > Given git aliases:
> >
> > >         stamp = show -s --format='%cI!%ce'
> > >         scommit = "!f(){ d=${1%%!*}; a=${1##*!}; arg=\"--until=$d -1\"; if [ $a != $1 ]; then arg=\"$arg --committer=$a\"; fi; shift; git rev-list $arg ${1:+\"$@\"}; }; f"
> > >         smaster = "!f(){ git scommit \"$1\" trunk --first-parent; }; f"
> > >         shs = "!f(){ git show $(git smaster $1); }; f"
> > >         slog = "!f(){ s=$1; shift; git log $(git smaster $s) $*; }; f"
> > >         sco = "!f(){ git checkout $(git smaster $1); }; f"
> >
> > and an action stamp 2015-08-20T20:55:15Z!jason, then
> >
> > git sco 2015-08-20T20:55:15Z\!jason
> >
> > will check out the (most recent) commit with that stamp.  It also works with
> > just the timestamp.
>
> This is a corner of git of which I knew not.  How does one set this sort of
> alias?  I Google...
>
> Will git config --global alias.stamp = show -s --format='%cI!%ce
>
> and analogous command lines work?

As Jonathan says, I was editing them directly into the [alias] section 
of my ~/.gitconfig .

> I think I understand what most of these are doing, but...you would be doing
> a service to the world if you wrote a little shellscript that set these up,
> with short explanatory comments reveraling what each is to be used for, like
> this:
>
> # sco - check out most recent commit with specified action stamp
>
> I'd add that to the reposurgeon distribution in a heartbeat.

Here's an improved version:

> 	# git stamp <commit-ish> - print a reposurgeon-style action stamp
> 	stamp = show -s --format='%cI!%ce'
>
> 	# git scommit <stamp> <rev-list-args> - list the most recent commit that matches <stamp>.
> 	# Must also specify a branch to search or --all.
> 	scommit = "!f(){ d=${1%%!*}; a=${1##*!}; arg=\"--until=$d -1\"; if [ $a != $1 ]; then arg=\"$arg --committer=$a\"; fi; shift; git rev-list $arg ${1:+\"$@\"}; }; f"
>
> 	# git scommits <stamp> <rev-list-args> - as above, but list all matching commits.
> 	scommits = "!f(){ d=${1%%!*}; a=${1##*!}; arg=\"--until=$d --after $d\"; if [ $a != $1 ]; then arg=\"$arg --committer=$a\"; fi; shift; git rev-list $arg ${1:+\"$@\"}; }; f"
>
> 	# git smaster <stamp> - list the most recent commit on master that matches <stamp>.
> 	smaster = "!f(){ git scommit \"$1\" master --first-parent; }; f"
> 	smasters = "!f(){ git scommits \"$1\" master --first-parent; }; f"
>
> 	# git shs <stamp> - show the commits on master that match <stamp>.
> 	shs = "!f(){ stamp=$(git smasters $1); shift; git show ${stamp:?not found} $*; }; f"
>
> 	# git slog <stamp> <log-args> - start git log at <stamp> on master
> 	slog = "!f(){ stamp=$(git smaster $1); shift; git log ${stamp:?not found} $*; }; f"
>
> 	# git sco <stamp> - check out the most recent commit on master that matches <stamp>.
> 	sco = "!f(){ stamp=$(git smaster $1); shift; git checkout ${stamp:?not found} $*; }; f"

Jason