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Fix an issue where any diff which could possibly be rendered as Jupyter decided to render as Jupyter

Summary:
See PHI1468. Engine selection for diffs is currently too aggressive in trying to find a shared engine and will fall back a shared engine with a very low score, causing all ".json" files to render as Jupyter files.

Only pick an engine as a difference engine by default if it's the highest-scoring engine for the new file.

Test Plan: Viewed ".json" files and ".ipynb" files in a revision. Before, both rendered as Jupyter. Now, the former rendered as JSON and the latter rendered as Jupyter.

Differential Revision: https://secure.phabricator.com/D20850
This commit is contained in:
epriestley 2019-10-01 18:46:56 -07:00
parent 76d9912932
commit 9f7aaa8ee4

View file

@ -1718,7 +1718,8 @@ final class DifferentialChangesetParser extends Phobject {
$viewer,
$new_ref);
$shared_engines = array_intersect_key($old_engines, $new_engines);
$shared_engines = array_intersect_key($new_engines, $old_engines);
$default_engine = head_key($new_engines);
foreach ($shared_engines as $key => $shared_engine) {
if (!$shared_engine->canDiffDocuments($old_ref, $new_ref)) {
@ -1734,7 +1735,17 @@ final class DifferentialChangesetParser extends Phobject {
$document_engine = null;
}
} else {
$document_engine = head($shared_engines);
// If we aren't rendering with a specific engine, only use a default
// engine if the best engine for the new file is a shared engine which
// can diff files. If we're less picky (for example, by accepting any
// shared engine) we can end up with silly behavior (like ".json" files
// rendering as Jupyter documents).
if (isset($shared_engines[$default_engine])) {
$document_engine = $shared_engines[$default_engine];
} else {
$document_engine = null;
}
}
if ($document_engine) {