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Decompose TYPE_MULTICOPY changes into a MOVE_HERE plus one or more COPY_HERE

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Summary:
See T419 for some philosophical musing on this. The "ideal" way to represent
these changes is two or more COPY_HERE plus a DELETE, but we can't build the
DELETE patch yet.

Just turn one of the COPY_HERE changes into a MOVE_HERE. While less idealistic,
I think this should always work.

Test Plan: This seemed to cleanly apply TenXer D265. TenXer guys, can you
confirm that this makes it actually patch correctly?

Reviewers: jonathanhester, bizrad6, kdeggelman, jungejason, btrahan

Reviewed By: jungejason

CC: aran, jonathanhester, jungejason, epriestley

Maniphest Tasks: T419

Differential Revision: https://secure.phabricator.com/D1270
This commit is contained in:
epriestley 2011-12-22 13:48:17 -08:00
parent ecc8fb13a8
commit cf00c44cc3
1 changed files with 44 additions and 0 deletions
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44
src/parser/bundle/ArcanistBundle.php
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@ -207,6 +207,50 @@ class ArcanistBundle {
public function toGitPatch() {
$result = array();
$changes = $this->getChanges();
foreach (array_keys($changes) as $multicopy_key) {
$multicopy_change = $changes[$multicopy_key];
$type = $multicopy_change->getType();
if ($type != ArcanistDiffChangeType::TYPE_MULTICOPY) {
continue;
}
// Decompose MULTICOPY into one MOVE_HERE and several COPY_HERE because
// we need more information than we have in order to build a delete patch
// and represent it as a bunch of COPY_HERE plus a delete. For details,
// see T419.
// Basically, MULTICOPY means there are 2 or more corresponding COPY_HERE
// changes, so find one of them arbitrariy and turn it into a MOVE_HERE.
// TODO: We might be able to do this more cleanly after T230 is resolved.
$decompose_okay = false;
foreach ($changes as $change_key => $change) {
if ($change->getType() != ArcanistDiffChangeType::TYPE_COPY_HERE) {
continue;
}
if ($change->getOldPath() != $multicopy_change->getCurrentPath()) {
continue;
}
$decompose_okay = true;
$change = clone $change;
$change->setType(ArcanistDiffChangeType::TYPE_MOVE_HERE);
$changes[$change_key] = $change;
// The multicopy is now fully represented by MOVE_HERE plus one or more
// COPY_HERE, so throw it away.
unset($changes[$multicopy_key]);
break;
}
if (!$decompose_okay) {
throw new Exception(
"Failed to decompose multicopy changeset in order to generate diff.");
}
}
foreach ($changes as $change) {
$type = $change->getType();
$file_type = $change->getFileType();