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https://github.com/moul/protoc-gen-gotemplate

:open_file_folder: generic protocol generator based on golang's text/template (grpc/protobuf)
https://github.com/moul/protoc-gen-gotemplate

ast code-generator generator golang protobuf protoc

Last synced: 5 days ago
JSON representation

:open_file_folder: generic protocol generator based on golang's text/template (grpc/protobuf)

Host: GitHub
URL: https://github.com/moul/protoc-gen-gotemplate
Owner: moul
License: mit
Created: 2016-11-04T20:44:49.000Z (about 8 years ago)
Default Branch: master
Last Pushed: 2024-12-09T20:09:38.000Z (15 days ago)
Last Synced: 2024-12-13T14:05:45.072Z (12 days ago)
Topics: ast, code-generator, generator, golang, protobuf, protoc
Language: Go
Homepage: https://manfred.life/protoc-gen-gotemplate
Size: 10.3 MB
Stars: 440
Watchers: 16
Forks: 68
Open Issues: 26
Metadata Files:
- Readme: README.md
- Funding: .github/FUNDING.yml
- License: LICENSE
- Codeowners: .github/CODEOWNERS
- Authors: AUTHORS

Awesome Lists containing this project

awesome-grpc - protoc-gen-gotemplate - Generic generator based on golang's template system (Tools / Other)

README

# `protoc-gen-gotemplate`
:open_file_folder: protocol generator + golang text/template (protobuf)

A generic **code**/script/data generator based on [Protobuf](https://developers.google.com/protocol-buffers/).

---

This project is a generator plugin for the Google Protocol Buffers compiler (`protoc`).

The plugin parses **protobuf** files, generates an **ast**, and walks a local **templates directory** to generate files using the [Golang's `text/template` engine](https://golang.org/pkg/text/template/).

## Philosophy

* protobuf-first
* no built-in template, only user defined templates
* kiss, *keep it stupid simple*

## Under the hood

1. the *user* `protobuf` files are parsed by [`protoc`](https://github.com/google/protobuf/releases)
2. the `ast` is generated by [`protoc-gen-go` helpers](https://github.com/golang/protobuf/tree/master/protoc-gen-go)
3. the `ast` is given to [Golang's `text/template` engine](https://golang.org/pkg/text/template/) for each *user* template files
4. the *funcmap* enriching the template engine is based on [Masterminds/sprig](https://github.com/Masterminds/sprig), and contains type-manipulation, iteration and language-specific helpers

## Dev helpers
1. Pre-commit script for install: https://pre-commit.com

## Web editor

![Web editor screenshot](https://github.com/moul/protoc-gen-gotemplate/raw/master/assets/web-editor.jpg)

[Demo server](http://protoc-gen-gotemplate.m.42.am/)

## Usage

`protoc-gen-gotemplate` requires a **template_dir** directory *(by default `./templates`)*.

Every file ending with `.tmpl` will be processed and written to the destination folder, following the file hierarchy of the `template_dir`, and remove the `.tmpl` extension.

---

```console
$> ls -R
input.proto templates/doc.txt.tmpl templates/config.json.tmpl
$> protoc --gotemplate_out=. input.proto
$> ls -R
input.proto templates/doc.txt.tmpl templates/config.json.tmpl
doc.txt config.json
```

### Options

You can specify custom options, as follow:

```console
$> protoc --gotemplate_out=debug=true,template_dir=/path/to/template/directory:. input.proto
```

| Option | Default Value | Accepted Values | Description
|-----------------------|---------------|---------------------------|-----------------------
| `template_dir` | `./template` | absolute or relative path | path to look for templates
| `destination_dir` | `.` | absolute or relative path | base path to write output
| `single-package-mode` | *false* | `true` or `false` | if *true*, `protoc` won't accept multiple packages to be compiled at once (*!= from `all`*), but will support `Message` lookup across the imported protobuf dependencies
| `debug` | *false* | `true` or `false` | if *true*, `protoc` will generate a more verbose output
| `all` | *false* | `true` or `false` | if *true*, protobuf files without `Service` will also be parsed

##### Hints

Shipping the templates with your project is very smart and useful when contributing on git-based projects.

Another workflow consists in having a dedicated repository for generic templates which is then versioned and vendored with multiple projects (npm package, golang vendor package, ...)

See [examples](./examples).

## Funcmap

This project uses [Masterminds/sprig](https://github.com/Masterminds/sprig) library and additional functions to extend the builtin [text/template](https://golang.org/pkg/text/template) helpers.

Non-exhaustive list of new helpers:

* **all the functions from [sprig](https://github.com/Masterminds/sprig)**
* `add`
* `boolFieldExtension`
* `camelCase`
* `contains`
* `divide`
* `fieldMapKeyType`
* `fieldMapValueType`
* `first`
* `getEnumValue`
* `getMessageType`
* `getProtoFile`
* `goNormalize`
* `goTypeWithPackage`
* `goType`
* `goZeroValue`
* `haskellType`
* `httpBody`
* `httpPath`
* `httpPathsAdditionalBindings`
* `httpVerb`
* `index`
* `int64FieldExtension`
* `isFieldMap`
* `isFieldMessageTimeStamp`
* `isFieldMessage`
* `isFieldRepeated`
* `jsSuffixReserved`
* `jsType`
* `json`
* `kebabCase`
* `last`
* `leadingComment`
* `leadingDetachedComments`
* `lowerCamelCase`
* `lowerFirst`
* `lowerGoNormalize`
* `multiply`
* `namespacedFlowType`
* `prettyjson`
* `replaceDict`
* `shortType`
* `snakeCase`
* `splitArray`
* `stringFieldExtension`
* `stringMethodOptionsExtension`
* `string`
* `subtract`
* `trailingComment`
* `trimstr`
* `upperFirst`
* `urlHasVarsFromMessage`

See the project helpers for the complete list.

## Install

* Install the **Go** compiler and tools from https://golang.org/doc/install
* Install **protobuf**: `go install github.com/golang/protobuf/protoc-gen-go@latest`
* Install **protoc-gen-gotemplate**: `go install moul.io/protoc-gen-gotemplate@latest`

## Docker

* automated docker hub build: [https://hub.docker.com/r/moul/protoc-gen-gotemplate/](https://hub.docker.com/r/moul/protoc-gen-gotemplate/)
* Based on [http://github.com/znly/protoc](http://github.com/znly/protoc)

Usage:

```console
$> docker run --rm -v "$(pwd):$(pwd)" -w "$(pwd)" moul/protoc-gen-gotemplate -I. --gotemplate_out=./output/ ./*.proto
```

## Projects using `protoc-gen-gotemplate`

* [kafka-gateway](https://github.com/moul/kafka-gateway/): Kafka gateway/proxy (gRPC + http) using Go-Kit
* [translator](https://github.com/moul/translator): Translator Micro-service using Gettext and Go-Kit
* [acl](https://github.com/moul/acl): ACL micro-service (gRPC/protobuf + http/json)

## See also

* [pbhbs](https://github.com/gponsinet/pbhbs): protobuf gen based on handlebarjs template

## License

MIT