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https://github.com/KyleBanks/depth

Visualize Go Dependency Trees
https://github.com/KyleBanks/depth

command-line-tool dependency-tree go visualizer

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Visualize Go Dependency Trees

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# depth

[![GoDoc](https://godoc.org/github.com/KyleBanks/depth?status.svg)](https://godoc.org/github.com/KyleBanks/depth) 
[![Build Status](https://travis-ci.org/KyleBanks/depth.svg?branch=master)](https://travis-ci.org/KyleBanks/depth) 
[![Go Report Card](https://goreportcard.com/badge/github.com/KyleBanks/depth)](https://goreportcard.com/report/github.com/KyleBanks/depth) 
[![Coverage Status](https://coveralls.io/repos/github/KyleBanks/depth/badge.svg?branch=master)](https://coveralls.io/github/KyleBanks/depth?branch=master)

`depth` is tool to retrieve and visualize Go source code dependency trees.

## Install

Download the appropriate binary for your platform from the [Releases](https://github.com/KyleBanks/depth/releases) page, or:

```sh
go get github.com/KyleBanks/depth/cmd/depth
```

## Usage

`depth` can be used as a standalone command-line application, or as a package within your own project.

### Command-Line

Simply execute `depth` with one or more package names to visualize. You can use the fully qualified import path of the package, like so:

```sh
$ depth github.com/KyleBanks/depth/cmd/depth
github.com/KyleBanks/depth/cmd/depth
├ encoding/json
├ flag
├ fmt
├ io
├ log
├ os
├ strings
└ github.com/KyleBanks/depth
├ fmt
├ go/build
├ path
├ sort
└ strings
12 dependencies (11 internal, 1 external, 0 testing).
```

Or you can use a relative path, for example:

```sh
$ depth .
$ depth ./cmd/depth
$ depth ../
```

You can also use `depth` on the Go standard library:

```sh
$ depth strings
strings
├ errors
├ internal/bytealg
├ io
├ sync
├ unicode
├ unicode/utf8
└ unsafe
7 dependencies (7 internal, 0 external, 0 testing).
```

Visualizing multiple packages at a time is supported by simply naming the packages you'd like to visualize:

```sh
$ depth strings github.com/KyleBanks/depth
strings
├ errors
├ internal/bytealg
├ io
├ sync
├ unicode
├ unicode/utf8
└ unsafe
7 dependencies (7 internal, 0 external, 0 testing).
github.com/KyleBanks/depth
├ bytes
├ errors
├ go/build
├ os
├ path
├ sort
└ strings
7 dependencies (7 internal, 0 external, 0 testing).
```

#### `-internal`

By default, `depth` only resolves the top level of dependencies for standard library packages, however you can use the `-internal` flag to visualize all internal dependencies:

```sh
$ depth -internal strings
strings
├ errors
│ └ internal/reflectlite
│ ├ internal/unsafeheader
│ │ └ unsafe
│ ├ runtime
│ │ ├ internal/abi
│ │ │ └ unsafe
│ │ ├ internal/bytealg
│ │ │ ├ internal/cpu
│ │ │ └ unsafe
│ │ ├ internal/cpu
│ │ ├ internal/goexperiment
│ │ ├ runtime/internal/atomic
│ │ │ └ unsafe
│ │ ├ runtime/internal/math
│ │ │ └ runtime/internal/sys
│ │ ├ runtime/internal/sys
│ │ └ unsafe
│ └ unsafe
├ internal/bytealg
├ io
│ ├ errors
│ └ sync
│ ├ internal/race
│ │ └ unsafe
│ ├ runtime
│ ├ sync/atomic
│ │ └ unsafe
│ └ unsafe
├ sync
├ unicode
├ unicode/utf8
└ unsafe
18 dependencies (18 internal, 0 external, 0 testing).
```

#### `-max`

The `-max` flag limits the dependency tree to the maximum depth provided. For example, if you supply `-max 1` on the `depth` package, your output would look like so:

```
$ depth -max 1 github.com/KyleBanks/depth/cmd/depth
github.com/KyleBanks/depth/cmd/depth
├ encoding/json
├ flag
├ fmt
├ io
├ log
├ os
├ strings
└ github.com/KyleBanks/depth
7 dependencies (6 internal, 1 external, 0 testing).
```

The `-max` flag is particularly useful in conjunction with the `-internal` flag which can lead to very deep dependency trees.

#### `-test`

By default, `depth` ignores dependencies that are only required for testing. However, you can view test dependencies using the `-test` flag:

```sh
$ depth -test strings
strings
├ bytes
├ errors
├ fmt
├ internal/bytealg
├ internal/testenv
├ io
├ math/rand
├ reflect
├ strconv
├ sync
├ testing
├ unicode
├ unicode/utf8
└ unsafe
14 dependencies (14 internal, 0 external, 7 testing).
```

#### `-explain target-package`

The `-explain` flag instructs `depth` to print import chains in which the
`target-package` is found:

```sh
$ depth -explain strings github.com/KyleBanks/depth/cmd/depth
github.com/KyleBanks/depth/cmd/depth -> strings
github.com/KyleBanks/depth/cmd/depth -> github.com/KyleBanks/depth -> strings
```

#### `-json`

The `-json` flag instructs `depth` to output dependencies in JSON format:

```sh
$ depth -json github.com/KyleBanks/depth/cmd/depth
{
"name": "github.com/KyleBanks/depth/cmd/depth",
"deps": [
{
"name": "encoding/json",
"internal": true,
"deps": null
},
...
{
"name": "github.com/KyleBanks/depth",
"internal": false,
"deps": [
{
"name": "go/build",
"internal": true,
"deps": null
},
...
]
}
]
}
```

### Integrating With Your Project

The `depth` package can easily be used to retrieve the dependency tree for a particular package in your own project. For example, here's how you would retrieve the dependency tree for the `strings` package:

```go
import "github.com/KyleBanks/depth"

var t depth.Tree
err := t.Resolve("strings")
if err != nil {
log.Fatal(err)
}

// Output: "'strings' has 4 dependencies."
log.Printf("'%v' has %v dependencies.", t.Root.Name, len(t.Root.Deps))
```

For additional customization, simply set the appropriate flags on the `Tree` before resolving:

```go
import "github.com/KyleBanks/depth"

t := depth.Tree {
ResolveInternal: true,
ResolveTest: true,
MaxDepth: 10,
}

err := t.Resolve("strings")
```

## Author

`depth` was developed by [Kyle Banks](https://twitter.com/kylewbanks).

## License

`depth` is available under the [MIT](./LICENSE) license.