srctx

srctx: source context

A library for converting your codebase into graph data structures. Powered by tree-sitter and LSIF.

Name	Status
Latest Version
Unit Tests
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About this tool

This library processes your code into precise function-level graphs, just like an IDE, and then you can apply some analysis on them.

This lib originally was designed for monitoring the influence of each commits.

With the raw diff, we can only get something like:

@@ -19,6 +20,7 @@ func AddDiffCmd(app *cli.App) {
        var lsifZip string
        var outputJson string
        var outputCsv string
+       var outputDot string
 
        diffCmd := &cli.Command{
                Name:  "diff",
:

If we need to know the impact of these line changes on the entire repository, we can only rely on manual reading of the code to evaluate.

With this lib developers can know exactly what happened in every lines of your code. Such as definition, reference.

./srctx diff --outputDot diff.dot

Some "dangerous" line changes can be found automatically.

We hope to utilize the powerful indexing capabilities of LSIF to quantify and evaluate the impact of text changes on the repository, reducing the mental burden on developers.

Usage

Usage as Github Action (Recommendation)

Because LSIF files require dev env heavily, it's really hard to provide a universal solution in a single binary file for all the repos.

We are currently working on diffctx, which will provide a GitHub Actions plugin that allows users to use it directly in a Pull Request.

Usage as Cli (Recommendation)

For Golang

We have embedded the lsif-go indexer in our prebuilt binary files. So all you need is:

wget https://github.com/williamfzc/srctx/releases/download/v0.4.2/srctx-linux-amd64
chmod +x srctx-linux-amd64
./srctx-linux-amd64 diff --withIndex --before HEAD~1 --after HEAD --lsif dump.lsif --outputCsv output.csv --outputDot output.dot

For Other Languages

1. Generate LSIF file

Some official tools we used in diffctx:

You will get a dump.lsif file after that.

2. Run srctx

Download our prebuilt binaries from release page.

For example, diff from HEAD~1 to HEAD:

./srctx diff --before HEAD~1 --after HEAD --lsif dump.lsif --outputCsv output.csv --outputDot output.dot

See details with ./srctx diff --help.

Usage as Lib

API

Our built-in diff implementation is a good example. cmd/srctx/diff/cmd.go

Low level API

Low level API allows developers consuming LSIF file directly.

yourLsif := "../parser/lsif/testdata/dump.lsif.zip"
sourceContext, _ := parser.FromLsifFile(yourLsif)

// all files?
files := sourceContext.Files()
log.Infof("files in lsif: %d", len(files))

// search definition in a specific file
defs, _ := sourceContext.DefsByFileName(files[0])
log.Infof("there are %d def happend in %s", len(defs), files[0])

for _, eachDef := range defs {
    log.Infof("happened in %d:%d", eachDef.LineNumber(), eachDef.Range.Character)
}

// or specific line?
_, _ = sourceContext.DefsByLine(files[0], 1)

// get all the references of a definition
refs, err := sourceContext.RefsByDefId(defs[0].Id())
if err != nil {
    panic(err)
}
log.Infof("there are %d refs", len(refs))

for _, eachRef := range refs {
    log.Infof("happened in file %s %d:%d",
    sourceContext.FileName(eachRef.FileId),
    eachRef.LineNumber(),
    eachRef.Range.Character)
}

Or see cmd/srctx/cmd_diff.go for a real example with git diff.

Roadmap

• Simpler installation
• Full support LSIF
• Better API

Contribution

Issues and PRs are always welcome.

References

LSIF is a standard format for persisted code analyzer output. Today, several companies are working to support its growth, including Sourcegraph and GitHub/Microsoft. The LSIF defines a standard format for language servers or other programming tools to emit their knowledge about a code workspace.

• https://lsif.dev/
• https://microsoft.github.io/language-server-protocol/overviews/lsif/overview/
• https://code.visualstudio.com/blogs/2019/02/19/lsif#_how-to-get-started

Thanks

• SCIP/LSIF toolchains from https://github.com/sourcegraph
• LSIF from Microsoft
• LSIF parser from GitLab
• IDE support from JetBrains

License

Apache 2.0