Use package github.com/lightningnetwork/lnd as an example.

Because the main.go is locate in github.com/lightningnetwork/lnd/cmd/lncli, so execute:

go-callvis github.com/lightningnetwork/lnd/cmd/lncli

then the browser will open link http://localhost:7878/ automatically, showing the dependency graph of the whole project.

But the graph is too complex, so many lines tangle together, which is hard to analyse.

To focus in one module of it, for example input module, you can add -focus flag followed by the the name or the path of input module:

go-callvis -focus input github.com/lightningnetwork/lnd/cmd/lncli

or

go-callvis -focus github.com/lightningnetwork/lnd/input github.com/lightningnetwork/lnd/cmd/lncli

-focus string

Focus package with import path or name. (default: main)

https://github.com/TrueFurby/go-callvis

It can make the graph more organized. There are 2 kinds of group: pkg, type.

After add -group type:

go-callvis --group type -focus input github.com/lightningnetwork/lnd/cmd/lncli

Some dependencies will be grouped into boxes with different types:

After add -group pkg,type(notice that it's not -group pkg, type, which has an extra space):

go-callvis --group pkg,type -focus input github.com/lightningnetwork/lnd/cmd/lncli

Some packages will be grouped into boxes of different modules, for example fmt.

Box of packages can be clicked, to focus on that. After click on the box of btcutil, browser jump to link of http://localhost:7878/?f=github.com/btcsuite/btcutil.

-group string

Grouping functions by packages and/or types. [pkg, type] (separated by comma)

https://github.com/TrueFurby/go-callvis

It makes packages in standard library ignored, makes the graph simpler.

go-callvis -nostd --group pkg,type -focus input github.com/lightningnetwork/lnd/cmd/lncli

-nostd

​ Omit calls to/from packages in standard library.

https://github.com/TrueFurby/go-callvis

Only show package from this package path:

go-callvis -nostd -group pkg,type -limit github.com/lightningnetwork/lnd github.com/lightningnetwork/lnd/cmd/lncli

Only packages defined in github.com/lightningnetwork/lnd will be shown, 3rd party packages like grpc, btcutil will be ignored.

-limit string

Limit package paths to prefix. (separated by comma)

https://github.com/TrueFurby/go-callvis

Internal calls of package main take too much space, they can be ignored with -nointer flag:

go-callvis -nostd -nointer -group pkg,type -limit github.com/lightningnetwork/lnd github.com/lightningnetwork/lnd/cmd/lncli

Because package lnrpc takes too much space, -ignore flag can be used to ignore it：

go-callvis -nostd -nointer -group pkg,type -limit github.com/lightningnetwork/lnd -ignore github.com/lightningnetwork/lnd/lnrpc github.com/lightningnetwork/lnd/cmd/lncli

But now, there are too few details, -nointer flag can be deleted to show more details inside package main

go-callvis -nostd -group pkg,type -limit github.com/lightningnetwork/lnd -ignore github.com/lightningnetwork/lnd/lnrpc github.com/lightningnetwork/lnd/cmd/lncli