Before this patch, the chunkselector for record or crecord was used to return
the list of hunks that were selected by the user. The goal of this series is to
reintroduce the toggle amend feature for crecord. To do so, we need to be able
to return more than just the selected hunks from the chunkselector but also
the information: is amend mode toggled. This patch adds a new return value for
chunkselectors that will be used to implement the toggle amend feature in
crecord.
By default, editor will use temp file named after hard-coded pattern
'hg-editor-XXX.txt' which makes it impossible for extensions to use
another filename if desired.
Now the middle part of the pattern ('editor') can be changed by
setting extra['prefix'].
As the author of several 3rd party extensions, I frequently see bug
reports from users attempting to run my extension with an old version
of Mercurial that I no longer support in my extension. Oftentimes, the
extension will import just fine. But as soon as we run extsetup(),
reposetup(), or get into the guts of a wrapped function, we encounter
an exception and abort. Today, Mercurial will print a message about
extensions that don't have a "testedwith" declaring explicit
compatibility with the current version.
The existing mechanism is a good start. But it isn't as robust as I
would like. Specifically, Mercurial assumes compatibility by default.
This means extension authors must perform compatibility checking in
their extsetup() or we wait and see if we encounter an abort at
runtime. And, compatibility checking can involve a lot of code and
lots of error checking. It's a lot of effort for extension authors.
Oftentimes, extension authors know which versions of Mercurial there
extension works on and more importantly where it is broken.
This patch introduces a magic "minimumhgversion" attribute in
extensions. When found, the extension loading mechanism will compare
the declared version against the current Mercurial version. If the
extension explicitly states we require a newer Mercurial version, a
warning is printed and the extension isn't loaded beyond importing
the Python module. This causes a graceful failure while alerting
the user of the compatibility issue.
I would be receptive to the idea of making the failure more fatal.
However, care would need to be taken to not criple every hg command.
e.g. the user may use `hg config` to fix the hgrc and if we aborted
trying to run that, the user would effectively be locked out of `hg`!
A potential future improvement to this functionality would be to catch
ImportError for the extension/module and parse the source code for
"minimumhgversion = 'XXX'" and do similar checking. This way we could
give more information about why the extension failed to load.
The next patch will merge the cmdutil.service() calls of both commandserver
and hgweb. Before doing it, this patch wipes out the code specific to hgweb
from commands.serve().
We have finally laid all the groundwork to make this happen.
The only change/delete conflicts that haven't been moved are .hgsubstate
conflicts. Those are trickier to deal with and well outside the scope of this
series.
We add comprehensive testing not just for the initial selections but also for
re-resolves and all possible dirstate transitions caused by merge tools. That
testing managed to shake out several bugs in the way we were handling dirstate
transitions.
The other test changes are because we now treat change/delete conflicts as
proper merges, and increment the 'merged' counter rather than the 'updated'
counter. I believe this is the right approach here.
For third-party extensions, if they're interacting with filemerge code they
might have to deal with an absentfilectx rather than a regular filectx.
Still to come:
- add a 'leave unresolved' option to merges
- change the default for non-interactive change/delete conflicts to be 'leave
unresolved'
- add debug output to go alongside debug outputs for binary and symlink file
merges
This is so much easier to read than a long string of zeroes, and we're going to
have a lot more of these nodes once change/delete conflicts are part of the
merge state.
We're going to soon compare the output of all the non-orig files before and
after a resolve, and this makes that more convenient. The .orig files are
obviously going to differ between the two.
This is somewhat different from the currently existing 'a' action, for the
following case:
- dirty working copy, with file 'fa' added and 'fm' modified
- hg merge --force with a rev that neither has 'fa' nor 'fm'
- for the change/delete conflicts we pick 'changed' for both 'fa' and 'fm'.
In this case 'branchmerge' is true, but we need to distinguish between 'fa',
which should ultimately be marked added, and 'fm', which should be marked
modified.
Our current strategy is to just not touch the dirstate at all. That works for
now, but won't work once we move change/delete conflicts to the resolve phase.
In that case we may perform repeated re-resolves, some of which might mark the
file removed or remove the file from the dirstate. We'll need to re-add the
file to the dirstate, and we need to be able to figure out whether we mark the
file added or modified. That is what the new 'am' action lets us do.
In upcoming patches we're going to move change/delete conflicts to the resolve
phase -- it will be important to see how regular conflicts interact with
change/delete ones.
The ':fail' tool now knows to write out the changed side for change/delete
conflicts.
This has no impact right now but will make things better when we move
change/delete conflicts in here.
We do this because we don't want to modify the dirstate for failures, and don't
just want to leave the file missing from disk. Plus it's more useful for the
user if the changed side is written out -- it is easier to delete a file than
to get it back via hg revert.
Once we move change/delete conflicts into the resolve phase, a 'dc' file might
first be resolved by picking the other side, then later be resolved by picking
the local side. For this transition we want to make sure that the file goes
back to not being in the dirstate.
This has no impact on conflicts during the initial merge.
At the moment this is a no-op (the only actions defined are 'r', 'a' and 'g'),
but soon we're going to add other sorts of actions to the dictionary returned
from mergestate.actions().
This should have been done as part of or as an immediate follow-up to
01b01d59e33f, but presumably this feature of extensions.py was
forgotten at that time.
The next patch will remove the progress extension completely, so we have
to pick another extension. The schemes is picked arbitrary.
This test was introduced at 57703c45ed60.
It was previously not at all obvious what this was for.
We also change it to a set to avoid iterating over an admittedly
small list repeatedly at startup time.
In many cases, we don't need to cast to a str because the object will
be cast when it is eventually written.
As part of testing this, I added some code to raise exceptions when a
non-str was passed in and wasn't able to trigger it. i.e. we're already
passing str into this function everywhere, so the casting isn't
necessary.
Previously, we stored 2-tuples of text and label in a list and then
evaluated the labels when the buffer was popped. After this patch,
we evaluate the labels at write time and do a simple join when the
buffer is popped.
This patch appears to have no impact on performance, despite creating
fewer 2-tuples and having fewer strings hanging around in memory.
This doesn't yet change behavior because labeling is still performed
at popbuffer time.
Surprisingly, this is the only in-tree consumer that passes
labeled=True.
As part of profiling `hg log` performance, I noticed a lot of time
is spent in buffered writes to ui instances. This patch starts a series
that refactors buffered writes with the eventual intent to improve
performance.
Currently, labels are expanded when buffers are popped. This means
we have to preserve the original text and the label until we render
the final output. This is avoidable overhead and adds complexity
since we're retaining state.
This patch adds functionality to ui.pushbuffer() to declare whether
label expansion should be active for the buffer. Labels are still
evaluated during buffer pop. This will change in a subsequent
patch.
Since we'll need to access the "expand labels" flag on future write()
operations, we prematurely optimize how the current value is stored
to optimize for rapid retrieval.
