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https://github.com/maxcnunes/gaper

Builds and restarts a Go project when it crashes or some watched file changes
https://github.com/maxcnunes/gaper

livereload restart-server

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Builds and restarts a Go project when it crashes or some watched file changes

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gaper


  


   Used to build and restart a Go project when it crashes or some watched file changes

   


   Aimed to be used in development only.

  



---



[![Software License](https://img.shields.io/badge/license-MIT-brightgreen.svg?style=flat-square)](LICENSE.md)

[![Linux - Build Status](https://travis-ci.org/maxcnunes/gaper.svg?branch=master)](https://travis-ci.org/maxcnunes/gaper)

[![Windows - Build status](https://ci.appveyor.com/api/projects/status/e0g00kmxwv44?svg=true)](https://ci.appveyor.com/project/maxcnunes/gaper)

[![Coverage Status](https://codecov.io/gh/maxcnunes/gaper/branch/master/graph/badge.svg)](https://codecov.io/gh/maxcnunes/gaper)

[![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](http://godoc.org/github.com/maxcnunes/gaper)

[![Go Report Card](https://goreportcard.com/badge/github.com/maxcnunes/gaper)](https://goreportcard.com/report/github.com/maxcnunes/gaper)

[![Powered By: GoReleaser](https://img.shields.io/badge/powered%20by-goreleaser-green.svg?style=flat-square)](https://github.com/goreleaser)



## Changelog



See [Releases](https://github.com/maxcnunes/gaper/releases) for detailed history changes.



## Installation



Using go tooling:



```

go get -u github.com/maxcnunes/gaper/cmd/gaper

```



Or, downloading the binary instead (example for version 1.1.0, make sure you are using the latest version though):



```

curl -SL https://github.com/maxcnunes/gaper/releases/download/v1.1.0/gaper_1.1.0_linux_amd64.tar.gz | tar -xvzf - -C "${GOPATH}/bin"

```



## Usage



```

NAME:

   gaper - Used to build and restart a Go project when it crashes or some watched file changes



USAGE:

   gaper [global options] command [command options] [arguments...]



VERSION:

   version



COMMANDS:

     help, h  Shows a list of commands or help for one command



GLOBAL OPTIONS:

   --bin-name value                 name for the binary built by gaper for the executed program (default current directory name)

   --build-path value               path to the program source code (default: ".")

   --build-args value               arguments used on building the program

   --program-args value             arguments used on executing the program

   --verbose                        turns on the verbose messages from gaper

   --disable-default-ignore         turns off default ignore for hidden files and folders, "*_test.go" files, and vendor folder

   --watch value, -w value          list of folders or files to watch for changes

   --ignore value, -i value         list of folders or files to ignore for changes

   --poll-interval value, -p value  how often in milliseconds to poll watched files for changes (default: 500)

   --extensions value, -e value     extensions to watch for changes (default: "go")

   --no-restart-on value, -n value  don't automatically restart the supervised program if it ends:

                                      if "error", an exit code of 0 will still restart.

                                      if "exit", no restart regardless of exit code.

                                      if "success", no restart only if exit code is 0.

   --help, -h                       show help

   --version, -v                    print the version

```



### Watch and Ignore paths



For those options Gaper supports static paths (e.g. `build/`, `seed.go`) or glob paths (e.g. `migrations/**/up.go`, `*_test.go`).



On using a path to a directory please add a `/` at the end (e.g. `build/`) to make sure Gaper won't include other matches that starts with that same value (e.g. `build/`, `build_settings.go`).



### Default ignore settings



Since in most projects there is no need to watch changes for:



* hidden files and folders

* test files (`*_test.go`)

* vendor folder



Gaper by default ignores those cases already. Although, if you need Gaper to watch those files anyway it is possible to disable this setting with `--disable-default-ignore` argument.



### Watch method



Currently Gaper uses polling to watch file changes. We have plans to [support fs events](https://github.com/maxcnunes/gaper/issues/12) though in a near future.



### Examples



Using all defaults provided by Gaper:



```

gaper

```



Example providing a few custom configurations:



```

gaper \

    --bin-name build/api-dev \

    --build-path cmd/server \

    --build-args "-ldflags=\"-X 'main.Version=dev'" \

    -w 'public/**' -w '*.go' \

    -e js -e css -e html \

    --ignore './**/*_mock.go' \

    --program-args "-arg1 ok -arg2=nope" \

    --watch .

```



## Contributing



See the [Contributing guide](/CONTRIBUTING.md) for steps on how to contribute to this project.



## Reference



This package was heavily inspired by [gin](https://github.com/codegangsta/gin) and [node-supervisor](https://github.com/petruisfan/node-supervisor).



Basically, Gaper is a mixing of those projects above. It started from **gin** code base and I rewrote it aiming to get

something similar to **node-supervisor** (but simpler). A big thanks for those projects and for the people behind it!

:clap::clap:



### How is Gaper different of Gin



The main difference is that Gaper removes a layer of complexity from Gin which has a proxy running on top of 

the executed server. It allows to postpone a build and reload the server when the first call hits it. With Gaper 

we don't care about that feature, it just restarts your server whenever a change is made.