The purpose of this research is to guess if a change request or an issue fix will impact legacy files (not changed for a while).

Objective of the demonstrator (first iterate):

1. From the repo list all files and make an estimate of the last modification time (without a costly tree walk)
2. In the list (1) mark all legacy files (modified more than 20% of project elapsed time)
3. Take an issue (e.g. Quarkus #34261)
4. Compute the distance form the text of the issue with all files of (1). This implie to transform all source file with the algo in transform.py (note: we might use a local DB in order not to do this operation and/or cache the result - with a cache invalidation on modified date).

Proof: 4 - Take a PR with modified files in the bug fixing (e.g.)

Install: pip3 install spacy python3 -m spacy download en_core_web_sm

Example with Quarkus: Issue: quarkusio/quarkus#34261 PR solving the issue: https://github.com/quarkusio/quarkus/pull/34371/commits

Impacted files: https://github.com/SivaM07/quarkus/blob/61a56c79dc3dbf9beb7075076af40f4ea98c5d9c/extensions/grpc/deployment/src/main/java/io/quarkus/grpc/deployment/GrpcServerProcessor.java https://github.com/SivaM07/quarkus/blob/61a56c79dc3dbf9beb7075076af40f4ea98c5d9c/extensions/grpc/deployment/src/test/java/io/quarkus/grpc/server/GrpcCustomHttpRootPathTest.java https://github.com/SivaM07/quarkus/blob/61a56c79dc3dbf9beb7075076af40f4ea98c5d9c/extensions/vertx-http/deployment/src/main/java/io/quarkus/vertx/http/deployment/VertxHttpProcessor.java https://github.com/SivaM07/quarkus/blob/61a56c79dc3dbf9beb7075076af40f4ea98c5d9c/extensions/vertx-http/deployment/src/main/java/io/quarkus/vertx/http/deployment/VertxWebRouterBuildItem.java

File not related with the issue: https://github.com/quarkusio/quarkus/blob/main/core/runtime/src/main/java/io/quarkus/runtime/graal/AwtImageIO.java