go-callvis is a development tool to help visualize call graph of a Go program using interactive view.

The purpose of this tool is to provide developers with a visual overview of a Go program using data from call graph and its relations with packages and types. This is especially useful in larger projects where the complexity of the code much higher or when you are just simply trying to understand code of somebody else.

• focus specific package in the program
• group functions by package and/or methods by type
• filter packages to specific import path prefixes
• omit various types of function calls
• 💥 NEW! interactive view using HTTP server that serves SVG images with links to dynamically change focused package

Check out the source code for the above image.

It runs pointer analysis to construct the call graph of the program and uses the data to generate output in dot format, which can be rendered with Graphviz tools.

Here you can find descriptions for various types of output.

• Go 1.8+
• Graphviz

go get -u github.com/TrueFurby/go-callvis
cd $GOPATH/src/github.com/TrueFurby/go-callvis && make

go-callvis [flags] <main package>

This will start HTTP server listening at http://localhost:7878/. You can change it via -http flag.

-focus string
      Focus package with import path or name. (default: main)
-group string
    Grouping functions by packages and/or types. [pkg, type] (separated by comma)
-http string
	HTTP service address. (default ":7878")
-limit string
    Limit package paths to prefix. (separated by comma)
-ignore string
    Ignore package paths with prefix. (separated by comma)
-include string
   	Include package paths with given prefixes (separated by comma)
-nointer
	Omit calls to unexported functions.
-nostd
	Omit calls to/from packages in standard library.
-tags build tags
	a list of build tags to consider satisfied during the build.
-tests
	Include test code.

Run go-callvis -h to list all supported flags.

Here is an example for the project syncthing.

Check out more examples and used command options.

Join #go-callvis channel at gophers.slack.com. (not a member yet? get invitation)

Did you find any bugs or have some suggestions?

• Feel free to open new issue or start discussion in the slack channel.

Do you want to contribute to the project?

• Fork the repository and open a pull request. Here you can find TODO features.

Ideal goal of this project is to make web app that would locally store the call graph data and then provide quick access of the call graphs for any package of your dependency tree. At first it would show an interactive map of overall dependencies between packages and then by selecting particular package it would show the call graph and provide various options to alter the output dynamically.