[webkit-dev] webkit-patch, check-webkit-style and git now support --squash and --git-commit

[Ojan Vafai]

The behavior of git and webkit-patch changed with
http://trac.webkit.org/changeset/58261.

Many webkit-patch commands (e.g. upload and land) and check-webkit-style now
take --squash and --git-commit arguments.

--git-commit: upload, commit, check-style, etc on the given git commit(s).
Commits can be specified as single commits (e.g. HEAD^) or mulitiple
(e.g. HEAD~2..HEAD). check-webkit-style's sense of --git-commit is no longer
all patches since the commit and --git-since is removed. The equivalent to
the old check-webkit-style behavior is "--git-commit=HEAD~2.." instead of
just using HEAD~2.

--squash: Treat all changes in the local branch as a single patch (local
commits + working copy changes). Doesn't actually modify your tree until you
land, at which point it squashes all local changes into a single local
commit and then lands that.

--no-squash: Treat all changes as separate. This is essentially just "git
svn dcommit". Each local change is committed separately.

If you leave out --squash and --no-squash, then something resembling the old
behavior is used.

old-behavior: upload, diff, create-patch, etc. only considered working-copy
changes and land will commit working-copy changes and then commit each local
commit separately.
new-behavior: is roughly like the above, except if there's only a single
local commit and no working-copy changes, then the commands will work on
that single local commit and otherwise raise an error.

Eventually, I'd like to make --squash the default, but I want this to bake
and get some usage before flipping that switch.

Finally, if you get sick of typing --squash or --no-squash, you can set the
webkit-patch.squash git config parameter to true/false.

Ojan
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