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Don't use the "ignore all whitespace" algorithm on multi-hunk diffs

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Summary:
Diffs with missing context don't render properly in the "ignore all whitespace"
algorith, so don't try to use it. These diffs can occur if someone creates a
diff via the web interface, for example, or if they muck around in their copy of
'arc'.

See D473, T246 (a problem with D473), rPe5bb756b5191720 (revert of D473) and
T231.

Test Plan:
Viewed a diff with missing context from the web interface. Verified normal diffs
still rendered with all whitespace ignored.

Reviewed By: fratrik
Reviewers: jungejason, aran, tuomaspelkonen, fratrik
Commenters: jungejason
CC: aran, epriestley, fratrik, jungejason
Differential Revision: 500
This commit is contained in:
epriestley 2011-06-22 16:12:09 -07:00
parent ae12262ef6
commit 9844bbb4f9
1 changed files with 19 additions and 1 deletions
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20
src/applications/differential/parser/changeset/DifferentialChangesetParser.php
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@ -745,7 +745,25 @@ class DifferentialChangesetParser {
if ($changeset->getFileType() == DifferentialChangeType::FILE_TEXT ||
$changeset->getFileType() == DifferentialChangeType::FILE_SYMLINK) {
if ($skip_cache || !$this->loadCache()) {
if ($this->whitespaceMode == self::WHITESPACE_IGNORE_ALL) {
// The "ignore all whitespace" algorithm depends on rediffing the
// files, and we currently need complete representations of both
// files to do anything reasonable. If we only have parts of the files,
// don't use the "ignore all" algorithm.
$can_use_ignore_all = true;
$hunks = $changeset->getHunks();
if (count($hunks) !== 1) {
$can_use_ignore_all = false;
} else {
$first_hunk = reset($hunks);
if ($first_hunk->getOldOffset() != 1 ||
$first_hunk->getNewOffset() != 1) {
$can_use_ignore_all = false;
}
}
if ($this->whitespaceMode == self::WHITESPACE_IGNORE_ALL &&
$can_use_ignore_all) {
// Huge mess. Generate a "-bw" (ignore all whitespace changes) diff,
// parse it out, and then play a shell game with the parsed format