go-dep-bazel-vscode-example

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go-dep-bazel-vscode-example

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Example setup for go + dep + bazel + vscode

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## Example setup for go + dep + bazel + vscode

This project shows how to use [rules_go_dep](https://github.com/scele/rules_go_dep) to set up a development enviromnent.

### Prerequisites

It is assumed that dep, bazel and vscode are already installed.

Currently the setup requires a custom build of the `vscode-go` extension, which can be installed with the following commands:

```bash
wget https://github.com/scele/vscode-go/releases/download/0.6.72-lpeltonen.2/Go-0.6.72-lpeltonen.2.vsix
code --install-extension ./Go-0.6.72-lpeltonen.2.vsix
rm ./Go-0.6.72-lpeltonen.2.vsix
```

The project setup points `vscode-go` to a fake `GOPATH` constructed into the bazel build area.  To prevent `vscode-go` from installing its dependency tools there, you should set `go.toolsGopath` in your vscode user settings to point somewhere else (e.g. to your normal `GOPATH`).

#### MacOS

- [Install delve](https://github.com/derekparker/delve/blob/master/Documentation/installation/osx/install.md) (you may need to apply [this workaround](https://github.com/go-delve/homebrew-delve/issues/19#issuecomment-330442033) if the installation fails)

### Clone this example project

```bash
go get -u github.com/scele/go-dep-bazel-vscode-example
cd $GOPATH/src/github.com/scele/go-dep-bazel-vscode-example
```

> **NOTE:** The build does not require the source to be under `$GOPATH`, but `dep ensure` does.

### Build and run with bazel

```bash
bazel build //...
bazel run //cmd/example
```

### Use vscode to debug

```bash
code -n .
```

In vscode, open `cmd/example/main.go`, set a breakpoint, and hit <kbd>F5</kbd> to start debugging.
Starting debugging will automatically invoke `bazel build`.

To build the app without launching debugger, you can hit <kbd>Ctrl</kbd>+<kbd>Shift</kbd>+<kbd>B</kbd> (<kbd>⇧⌘B</kbd> on macOS).

### Update go dependencies

```bash
dep ensure
rm -rf ./vendor
```

The `vendor` directory should be manually deleted, since the dependencies will be pulled through bazel.

### Update BUILD files

```bash
bazel run //:gazelle
```

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