git p4: Fixing script editor checks

If P4EDITOR is defined, the tests will fail when "git p4" starts an
editor.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git p4: import/export of labels to/from p4

The existing label import code looks at each commit being
imported, and then checks for labels at that commit. This
doesn't work in the real world though because it will drop
labels applied on changelists that have already been imported,
a common pattern.

This change adds a new --import-labels option. With this option,
at the end of the sync, git p4 gets sets of labels in p4 and git,
and then creates a git tag for each missing p4 label.

This means that tags created on older changelists are
still imported.

Tags that could not be imported are added to an ignore
list.

The same sets of git and p4 tags and labels can also be used to
derive a list of git tags to export to p4. This is enabled with
--export-labels in 'git p4 submit'.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-cherry-pick: add allow-empty option

git cherry-pick fails when picking a non-ff commit that is empty.  The advice
given with the failure is that a git-commit --allow-empty should be issued to
explicitly add the empty commit during the cherry pick.  This option allows a
user to specify before hand that they want to keep the empty commit.  This
eliminates the need to issue both a cherry pick and a commit operation.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git p4: fix-up "import/export of labels to/from p4"

The previous one is already in 'next' but was somewhat lacking.

The configuration "git-p4.validLabelRegexp" is now called
"labelExportRegexp", and its default covers lowercase alphabets as
well.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git p4: Squash P4EDITOR in test harness

If P4EDITOR is set in the environment, test behavior could be
unpredictable. Set it explicitly.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git p4: Ignore P4EDITOR if it is empty

p4 itself treats an empty value for P4EDITOR as the same as
having P4EDITOR unset. Do the same for "git p4".

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git p4: move verbose to base class

The verbose flag is common to all classes, or at least should be.
Make it a member of the base Command class, rather than
reimplementing for each class. Make option parsing mirror this.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-cherry-pick: Add keep-redundant-commits option

The git-cherry-pick --allow-empty command by default only preserves empty
commits that were originally empty, i.e only those commits for which
<commit>^{tree} and <commit>^^{tree} are equal.  By default commits which are
non-empty, but were made empty by the inclusion of a prior commit on the current
history are filtered out.  This option allows us to override that behavior and
include redundant commits as empty commits in the change history.

Note that this patch changes the default behavior of git cherry-pick slightly.
Prior to this patch all commits in a cherry-pick sequence were applied and git
commit was run.  The implication here was that, if a commit was redundant, and
the commit did not trigger the fast forward logic, the git commit operation, and
therefore the git cherry-pick operation would fail, displaying the cherry pick
advice (i.e. run git commit --allow-empty).  With this patch however, such
redundant commits are automatically skipped without stopping, unless
--keep-redundant-commits is specified, in which case, they are automatically
applied as empty commits.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-cherry-pick: Add test to validate new options

Since we've added the --allow-empty and --keep-redundant-commits
options to git cherry-pick we should also add a test to ensure that its working
properly.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git-rebase: add keep_empty flag

Add a command line switch to git-rebase to allow a user the ability to specify
that they want to keep any commits in a series that are empty.

When git-rebase's type is am, then this option will automatically keep any
commit that has a tree object identical to its parent.

This patch changes the default behavior of interactive rebases as well.  With
this patch, git-rebase -i will produce a revision set passed to
git-revision-editor, in which empty commits are commented out.  Empty commits
may be kept manually by uncommenting them.  If the new --keep-empty option is
used in an interactive rebase the empty commits will automatically all be
uncommented in the editor.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
git p4: fix unit tests

The submit-edit tests relied on P4EDITOR being unset. Set it
explicitly to an empty string.

Signed-off-by: Luke Diamand <luke@diamand.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
config: reject bogus section names for --rename-section

You can feed junk to "git config --rename-section", which
will result in a config file that git will not even parse
(so you cannot fix it with git-config). We already have
syntactic sanity checks when setting a variable; let's do
the same for section names.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Merge branch 'jk/maint-config-bogus-section'

"git config --rename-section" to rename an existing section into a
bogus one did not check the new name.

By Jeff King
* jk/maint-config-bogus-section:
  config: reject bogus section names for --rename-section
Merge branch 'nh/empty-rebase'

"git rebase" learned to optionally keep commits that do not introduce
any change in the original history.

By Neil Horman
* nh/empty-rebase:
  git-rebase: add keep_empty flag
  git-cherry-pick: Add test to validate new options
  git-cherry-pick: Add keep-redundant-commits option
  git-cherry-pick: add allow-empty option
Merge branch 'ld/git-p4-tags-and-labels'

By Luke Diamand
* ld/git-p4-tags-and-labels:
  git p4: fix unit tests
  git p4: move verbose to base class
  git p4: Ignore P4EDITOR if it is empty
  git p4: Squash P4EDITOR in test harness
  git p4: fix-up "import/export of labels to/from p4"
  git p4: import/export of labels to/from p4
  git p4: Fixing script editor checks