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pase's Introduction

PaSe

Pa(tch)Se(arch) is an experimental search engine for code allowing search by patch.

It will return files by applicability of a specified patch.

Indexing

To index a source directory:

java -jar pase.jar index <source_path> <index_path>

Searching

Once indexing has finished, you can search:

  • on the command line: use java -jar pase.jar search <index_path> <patch_path>
  • via API:
    • use java -jar pase.jar serve <index_path> to start the PaSe Server
    • query the URL http://localhost:4567/search?patch=URL_ENCODED_PATCH to get results as JSON (see utils/example_client.py for a full example)
  • via the Web UI:
    • use java -jar pase.jar serve <index_path> to start the PaSe Server
    • visit http://localhost:4567 with your browser

Screen capture of PaSe's Web UI

pase's People

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Forkers

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pase's Issues

Some patches do not parse 

> java -jar pase/target/pase-0.1-SNAPSHOT.jar search ./opensuse-index/ ./opensuse/bazel2.0-2.0.0-lp152.3.2.src.rpm_contents/bazel-2.0.0-dist.zip_contents/third_party/aws-sdk-auth-lite/patches-vs-1.11.297/01-bazel-strip-unused.patch

Exception in thread "main" com.github.difflib.unifieddiff.UnifiedDiffParserException: expected file start line not found
        at com.github.difflib.unifieddiff.UnifiedDiffReader.parse(UnifiedDiffReader.java:90)
        at com.github.difflib.unifieddiff.UnifiedDiffReader.parseUnifiedDiff(UnifiedDiffReader.java:136)
        at com.suse.pase.PatchParser.parsePatch(PatchParser.java:26)
        at com.suse.pase.Main.search(Main.java:39)
        at com.suse.pase.Main.main(Main.java:17)

Index trigrams

One Lucene limitation when it comes to fuzzy search is that the maximum edit distance is capped to 2 due to algorithmic reasons.

One way to circumvent this is to index trigrams instead of lines, thereby allowing some trigrams to be missing or be different in sequence, rather than searching for lines and allowing fuzzy matching with up to two edits.

This requires changing SourceAnalyzer to decompose text in trigrams and, crucially, rewrite queries so that they target trigrams.

Then performance has to be evaluated (time-wise and search-effectiveness-wise).

Try again GraalVM

Building a standalone binary with GraalVM's native-image was attempted a while ago but got blocked by oracle/graal#2761 (needed by Lucene, see oracle/graal#2721).

Now the issue has been resolved and it would be cool to have a standalone binary again.

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