本文介绍一款工具 go-callvis，它能够将 Go 代码的调用关系可视化出来，并提供了可交互式的 web 服务。
go get -u github.com/ofabry/go-callvis
在windows系统上并没有自动安装，需要进入下载的目录go install
在linux系统上自动安装了
> go-callvis
go-callvis: visualize call graph of a Go program.
Usage:
go-callvis [flags] package
Package should be main package, otherwise -tests flag must be used.
Flags:
-debug
Enable verbose log.
-file string
output filename - omit to use server mode
-focus string
Focus specific package using name or import path. (default "main")
-format string
output file format [svg | png | jpg | ...] (default "svg")
-graphviz
Use Graphviz's dot program to render images.
-group string
Grouping functions by packages and/or types [pkg, type] (separated by comma) (default "pkg")
-http string
HTTP service address. (default ":7878")
-ignore string
Ignore package paths containing given prefixes (separated by comma)
-include string
Include package paths with given prefixes (separated by comma)
-limit string
Limit package paths to given prefixes (separated by comma)
-minlen uint
Minimum edge length (for wider output). (default 2)
-nodesep float
Minimum space between two adjacent nodes in the same rank (for taller output). (default 0.35)
-nointer
Omit calls to unexported functions.
-nostd
Omit calls to/from packages in standard library.
-skipbrowser
Skip opening browser.
-tags build tags
a list of build tags to consider satisfied during the build. For more information about build tags, see the description of buil
d constraints in the documentation for the go/build package
-tests
Include test code.
-version
Show version and exit.
依赖
-graphviz测试代码
在linux上可以正常运行，windows上会报错
> go-callvis main67.go
2022/09/21 15:28:50 http serving at http://localhost:7878
go-callvis 默认将代码调用关系存储成 svg 格式的图形。
http://localhost:7878
点击上面的 log 模块，将会进入 log 模块的代码调用交互图中
它主要是作用是清晰的列出了包与包之间的依赖以及调用关系，用来理解项目的大致架构。