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docs: Incorporate massive docs update w/new site
Closes #1499.
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README.md

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<p align="center"><img src="docs/img/DigbyShadows.png" width="360"></p>
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<p align="center"><img src="docs/assets/DigbyShadows.png" width="360"></p>
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<p align="center">
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<a href="https://travis-ci.org/golang/dep"><img src="https://travis-ci.org/golang/dep.svg?branch=master" alt="Build Status"></img></a>
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<a href="https://ci.appveyor.com/project/golang/dep"><img src="https://ci.appveyor.com/api/projects/status/github/golang/dep?svg=true&branch=master&passingText=Windows%20-%20OK&failingText=Windows%20-%20failed&pendingText=Windows%20-%20pending" alt="Windows Build Status"></a>
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## Dep
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`dep` is a prototype dependency management tool for Go. It requires Go 1.8 or newer to compile.
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`dep` is a prototype dependency management tool for Go. It requires Go 1.8 or newer to compile. **`dep` is safe for production use.**
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`dep` is the official _experiment_, but not yet the official tool. Check out the [Roadmap](https://github.com/golang/dep/wiki/Roadmap) for more on what this means!
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## Current status
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For guides and reference materials about `dep`, see [the documentation](https://golang.github.io/dep).
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`dep` is safe for production use. That means two things:
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## Installation
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* Any valid metadata file (`Gopkg.toml` and `Gopkg.lock`) will be readable and considered valid by any future version of `dep`.
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* The CLI UI is mostly stable. `dep init` and `dep ensure` are mostly set; `dep status` is likely to change a fair bit, and `dep prune` is [going to be absorbed into `dep ensure`](https://github.com/golang/dep/issues/944).
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It is strongly recommended that you use a released version. Release binaries are available on the [releases](https://github.com/golang/dep/releases) page.
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That said, keep in mind the following:
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* `dep init` on an existing project can be a rocky experience - we try to automatically convert from other tools' metadata files, and that process is often complex and murky. Once your project is converted and you're using `dep ensure`, its behavior is quite stable.
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* `dep` still has nasty bugs, but in general these are comparable to or fewer than other tools out there.
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* `dep` is [pretty slow right now](https://github.com/golang/dep/blob/master/docs/FAQ.md#why-is-dep-slow), especially on the first couple times you run it. Just know that there is a _lot_ of headroom for improvement, and work is actively underway.
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* `dep` is still changing rapidly. If you need stability (e.g. for CI), it's best to rely on a released version, not tip.
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* `dep`'s exported API interface will continue to change in unpredictable, backwards-incompatible ways until we tag a v1.0.0 release.
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## Context
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- [The Saga of Go Dependency Management](https://blog.gopheracademy.com/advent-2016/saga-go-dependency-management/)
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- Official Google Docs
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- [Go Packaging Proposal Process](https://docs.google.com/document/d/18tNd8r5DV0yluCR7tPvkMTsWD_lYcRO7NhpNSDymRr8/edit)
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- [User Stories](https://docs.google.com/document/d/1wT8e8wBHMrSRHY4UF_60GCgyWGqvYye4THvaDARPySs/edit)
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- [Features](https://docs.google.com/document/d/1JNP6DgSK-c6KqveIhQk-n_HAw3hsZkL-okoleM43NgA/edit)
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- [Design Space](https://docs.google.com/document/d/1TpQlQYovCoX9FkpgsoxzdvZplghudHAiQOame30A-v8/edit)
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- [Frequently Asked Questions](docs/FAQ.md)
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## Setup
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Grab the latest binary from the [releases](https://github.com/golang/dep/releases) page.
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On macOS you can install or upgrade to the latest released version with Homebrew:
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On MacOS you can install or upgrade to the latest released version with Homebrew:
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```sh
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$ brew install dep
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go get -u github.com/golang/dep/cmd/dep
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```
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To start managing dependencies using dep, run the following from your project's root directory:
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```sh
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$ dep init
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```
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This does the following:
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1. Look for [existing dependency management files](docs/FAQ.md#what-external-tools-are-supported) to convert
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1. Check if your dependencies use dep
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1. Identify your dependencies
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1. Back up your existing `vendor/` directory (if you have one) to
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`_vendor-TIMESTAMP/`
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1. Pick the highest compatible version for each dependency
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1. Generate [`Gopkg.toml`](docs/Gopkg.toml.md) ("manifest") and `Gopkg.lock` files
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1. Install the dependencies in `vendor/`
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## Usage
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There is one main subcommand you will use: `dep ensure`. `ensure` first checks that `Gopkg.lock` is consistent with `Gopkg.toml` and the `import`s in your code. If any
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changes are detected, `dep`'s solver works out a new `Gopkg.lock`. Then, `dep` checks if the contents of `vendor/` are what `Gopkg.lock` (the new one if applicable, else the existing one) says it should be, and rewrites `vendor/` as needed to bring it into line.
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In essence, `dep ensure` [works in two phases to keep four buckets of state in sync](https://youtu.be/5LtMb090AZI?t=20m4s):
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<img width="463" alt="states-flow" src="https://user-images.githubusercontent.com/21599/29223886-22dd2578-7e96-11e7-8b51-3637b9ddc715.png">
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_Note: until we ship [vendor verification](https://github.com/golang/dep/issues/121), we can't efficiently perform the `Gopkg.lock` <-> `vendor/` comparison, so `dep ensure` unconditionally regenerates all of `vendor/` to be safe._
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`dep ensure` is safe to run early and often. See the help text for more detailed
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usage instructions.
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```sh
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$ dep help ensure
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```
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### Installing dependencies
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(if your `vendor/` directory isn't [checked in with your code](docs/FAQ.md#should-i-commit-my-vendor-directory))
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<!-- may change with https://github.com/golang/dep/pull/489 -->
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```sh
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$ dep ensure
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```
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If a dependency already exists in your `vendor/` folder, dep will ensure it
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matches the constraints from the manifest. If the dependency is missing from
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`vendor/`, the latest version allowed by your manifest will be installed.
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### Adding a dependency
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```sh
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$ dep ensure -add github.com/foo/bar
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```
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This adds a version constraint to your `Gopkg.toml`, and updates `Gopkg.lock` and `vendor/`. Now, import and use the package in your code! ✨
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`dep ensure -add` has some subtle behavior variations depending on the project or package named, and the state of your tree. See `dep ensure -examples` for more information.
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### Changing dependencies
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If you want to:
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* Change the allowed `version`/`branch`/`revision`
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* Switch to using a fork
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for one or more dependencies, do the following:
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1. Manually edit your `Gopkg.toml`.
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1. Run
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```sh
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$ dep ensure
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```
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### Checking the status of dependencies
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Run `dep status` to see the current status of all your dependencies.
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```sh
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$ dep status
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PROJECT CONSTRAINT VERSION REVISION LATEST
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github.com/Masterminds/semver branch 2.x branch 2.x 139cc09 c2e7f6c
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github.com/Masterminds/vcs ^1.11.0 v1.11.1 3084677 3084677
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github.com/armon/go-radix * branch master 4239b77 4239b77
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```
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On top of that, if you have added new imports to your project or modified `Gopkg.toml` without running `dep ensure` again, `dep status` will tell you there is a mismatch between `Gopkg.lock` and the current status of the project.
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```sh
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$ dep status
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Lock inputs-digest mismatch due to the following packages missing from the lock:
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PROJECT MISSING PACKAGES
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github.com/Masterminds/goutils [github.com/Masterminds/goutils]
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This happens when a new import is added. Run `dep ensure` to install the missing packages.
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```
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As `dep status` suggests, run `dep ensure` to update your lockfile. Then run `dep status` again, and the lock mismatch should go away.
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### Visualizing dependencies
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Generate a visual representation of the dependency tree by piping the output of `dep status -dot` to [graphviz](http://www.graphviz.org/).
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#### Linux
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```
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$ sudo apt-get install graphviz
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$ dep status -dot | dot -T png | display
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```
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#### MacOS
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```
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$ brew install graphviz
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$ dep status -dot | dot -T png | open -f -a /Applications/Preview.app
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```
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#### Windows
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```
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> choco install graphviz.portable
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> dep status -dot | dot -T png -o status.png; start status.png
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```
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<p align="center"><img src="docs/img/StatusGraph.png"></p>
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### Updating dependencies
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Updating brings the version of a dependency in `Gopkg.lock` and `vendor/` to the latest version allowed by the constraints in `Gopkg.toml`.
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You can update just a targeted subset of dependencies (recommended):
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```sh
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$ dep ensure -update github.com/some/project github.com/other/project
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$ dep ensure -update github.com/another/project
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```
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Or you can update all your dependencies at once:
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```sh
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$ dep ensure -update
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```
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"Latest" means different things depending on the type of constraint in use. If you're depending on a `branch`, `dep` will update to the latest tip of that branch. If you're depending on a `version` using [a semver range](#semantic-versioning), it will update to the latest version in that range.
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### Removing dependencies
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1. Remove the `import`s and all usage from your code.
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1. Remove `[[constraint]]` rules from `Gopkg.toml` (if any).
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1. Run
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```sh
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$ dep ensure
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```
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### Testing changes to a dependency
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Making changes in your `vendor/` directory directly is not recommended, as dep
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will overwrite any changes. Instead:
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1. Delete the dependency from the `vendor/` directory.
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```sh
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rm -rf vendor/<dependency>
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```
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1. Add that dependency to your `GOPATH`, if it isn't already.
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```sh
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$ go get <dependency>
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```
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1. Modify the dependency in `$GOPATH/src/<dependency>`.
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1. Test, build, etc.
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Don't run `dep ensure` until you're done. `dep ensure` will reinstall the
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dependency into `vendor/` based on your manifest, as if you were installing from
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scratch.
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This solution works for short-term use, but for something long-term, take a look
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at [virtualgo](https://github.com/GetStream/vg).
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To test out code that has been pushed as a new version, or to a branch or fork,
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see [changing dependencies](#changing-dependencies).
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## Semantic Versioning
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`dep ensure` uses an external [semver library](https://github.com/Masterminds/semver) to interpret the version constraints you specify in the manifest. The comparison operators are:
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* `=`: equal
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* `!=`: not equal
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* `>`: greater than
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* `<`: less than
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* `>=`: greater than or equal to
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* `<=`: less than or equal to
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* `-`: literal range. Eg: 1.2 - 1.4.5 is equivalent to >= 1.2, <= 1.4.5
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* `~`: minor range. Eg: ~1.2.3 is equivalent to >= 1.2.3, < 1.3.0
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* `^`: major range. Eg: ^1.2.3 is equivalent to >= 1.2.3, < 2.0.0
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* `[xX*]`: wildcard. Eg: 1.2.x is equivalent to >= 1.2.0, < 1.3.0
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You might, for example, include a constraint in your manifest that specifies `version = "=2.0.0"` to pin a dependency to version 2.0.0, or constrain to minor releases with: `version = "2.*"`. Refer to the [semver library](https://github.com/Masterminds/semver) documentation for more info.
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**Note**: When you specify a version *without an operator*, `dep` automatically uses the `^` operator by default. `dep ensure` will interpret the given version as the min-boundary of a range, for example:
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* `0.2.3` becomes the range `>=0.2.3, <0.3.0`
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* `0.0.3` becomes the range `>=0.0.3, <0.1.0`
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## Feedback
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Feedback is greatly appreciated.
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At this stage, the maintainers are most interested in feedback centered on the user experience (UX) of the tool.
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Do you have workflows that the tool supports well, or doesn't support at all?
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Do any of the commands have surprising effects, output, or results?
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Please check the existing issues and [FAQ](docs/FAQ.md) to see if your feedback has already been reported.
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If not, please file an issue, describing what you did or wanted to do, what you expected to happen, and what actually happened.
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## Contributing

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# FAQ
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---
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title: FAQ
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---
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_The first rule of FAQ is don't bikeshed the FAQ, leave that for
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[Create structure for managing docs](https://github.com/golang/dep/issues/331)._
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Please contribute to the FAQ! Found an explanation in an issue or pull request helpful?
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Summarize the question and quote the reply, linking back to the original comment.
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The FAQ predated the introduction of the rest of the documentation. If something in here conflicts with other guides or reference documents, it's probably here that it's wrong - please file a PR!
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## Concepts
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* [Does `dep` replace `go get`?](#does-dep-replace-go-get)
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## How does `dep` handle symbolic links?
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> because we're not crazy people who delight in inviting chaos into our lives, we need to work within one `GOPATH` at a time.
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-[@sdboyer in #247](https://github.com/golang/dep/pull/247#issuecomment-284181879)
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> -[@sdboyer in #247](https://github.com/golang/dep/pull/247#issuecomment-284181879)
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Out of convenience, one might create a symlink to a directory within their `GOPATH/src`, e.g. `ln -s ~/go/src/github.com/user/awesome-project ~/Code/awesome-project`.
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