Breakthrough tooling to work with Kotlin and Java codebases 🚀

🏎️ Installation

brew install legacycodehq/tap/eureka

🎉 Updates

brew upgrade eureka

Live demo

You can try this sample interactive graph for Signal Android App's StoryViewerPageFragment class.

Features

1. Class visualization

⚠️ Important: You must first build the project and then run the watch subcommand.

The command will start a web server on port 7070. Go to localhost:7070 in your browser to see the diagram. The diagram updates in real-time as you make changes to the source code and compile the project.

Usage

eureka watch StoryViewerPageFragment

Usage (Android, experimental and recommended)

eureka watch -x android StoryViewerPageFragment

Read this blog post to learn how to use the experimental feature when examining Android classes.

Identifying Clusters

Press Cmd + K on Mac or Ctrl + K on Linux and Windows to open the identify cluster dialog. This blog article has instructions on how to use cluster identification.

For more options, run eureka watch --help.

2. Class inheritance hierarchy visualization (experimental)

Usage (Android)

eureka hierarchy signal-6.23.3.apk -n androidx.fragment.app.Fragment

Usage (JVM artifacts)

eureka hierarchy truth-1.1.5.jar -n com.google.common.truth.Subject

Visit localhost:7090 in your browser to see the diagram.

Pruning

Visualizing class hierarchies as trees is a useful way to understand complex structures in software. Sometimes, these trees can become quite large, making it difficult to find relevant information. To address this, we offer a feature that allows you to 'prune' these trees by specifying certain keywords.

Pruning in this context means reducing the size of the tree to only include nodes that match the given keyword, or have descendants that match the keyword. This feature can significantly reduce the complexity of the tree, making it easier to navigate and understand.

To use this feature, you simply adjust the URL of your tree visualization by providing a prune parameter. For example,

http://localhost:7090/?class=androidx.fragment.app.Fragment&prune=Payment

3. Routes between screens in an Android app (experimental)

Usage

eureka flows wikipedia.apk

Visit localhost:7060 in your browser to see the diagram.

4. List files with highest LOC

Usage (default, searches Kotlin and Java sources)

eureka top 10

Output

Showing 10 of 140
-----------------
 1. bytecode/scanner/src/test/kotlin/com/legacycode/eureka/ClassScannerKotlinTest.kt   321
 2. bytecode/scanner/src/main/kotlin/com/legacycode/eureka/ClassScanner.kt             303
 3. bytecode/scanner/src/main/kotlin/com/legacycode/eureka/ClassStructure.kt           232
 4. vcs/src/test/kotlin/com/legacycode/eureka/vcs/blame/BlameLineTest.kt               183
 5. web-server/src/main/kotlin/com/legacycode/eureka/web/WatchServer.kt                149
 6. bytecode/scanner/src/test/kotlin/com/legacycode/eureka/ClassScannerJavaTest.kt     126
 7. build-systems/gradle/src/main/kotlin/com/legacycode/eureka/gradle/Run.kt           117
 8. web-server/src/main/kotlin/com/legacycode/eureka/web/ownership/OwnershipServer.kt  117
 9. bytecode/scanner/src/test/kotlin/com/legacycode/eureka/QualifiedTypeTest.kt        114
10. bytecode/scanner/src/main/kotlin/com/legacycode/eureka/MethodDescriptor.kt         96

Usage (specify extensions)

eureka top 10 --ext cpp,swift

5. File ownership (experimental)

Usage

eureka ownership

The command will start a web server on port 7080. Visit the app on localhost:7080.

Known issues

• Throws exceptions when visiting binary or empty files.

6. Module dependency diagram (experimental)

Usage

eureka modules ~/GitHubProjects/Signal-Android

The command will print a Graphviz directed graph DSL.

1. Copy the DSL and paste it into the online Graphviz tool.
2. The tool selects the dot engine by default, for best results use the circo engine from the engine dropdown.

Release a new build

Credentials (initial setup)

1. Create a ~/.jreleaser/config.properties file.
2. Add the following properties to the file.

JRELEASER_GITHUB_TOKEN=<token>
JRELEASER_HOMEBREW_GITLAB_TOKEN=<token>

Where token is a GitHub personal access token with delete:packages, repo, and write:packages scopes.

Releasing

1. If you have multiple JDKs installed, switch to JDK 11.

2. Release,

   • For minor releases, run ./release.sh
   • For bug fix releases, run ./bug_fix_release.sh

3. Update changelog

   • Go to the GitHub releases page and edit the release notes for the latest release.

Licenses

Copyright (c) 2022-Present, Legacy Code Headquarters (OPC) Private Limited

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Copyright 2018–2020 Observable, Inc.

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.