A minimal Watch Utility who can run and restart specified command in response to file changes automatically.
This utility is intended to provide a tiny tool to automate the Edit-Build-Run
loop of development. Although it is quite similar to watch tasks of Grunt or Gulp,
wu is designed to be just a single command with simplest interfaces to work with.
wu from source code, you have to install Golang's tool chain first.
go get github.com/shanzi/wu go install github.com/shanzi/wu
Precompiled version can be found here.
wu -h for help message:
Usage: wu [options] [command] -config string Config file (default ".wu.json") -dir string Directory to watch -pattern string Patterns to filter filenames -save Save options to conf
You just run you command with
wu will run your command at the start,
try to terminate previous when new changes take place and then start running a new one.
You can stop the process by sending a
SIGINT signal (typically by
wu sleep 10
Start watching... - Running command: sleep 10 - Terminated. File changed: /path/to/changed/file.txt - Running command: sleep 10 - Done. File changed: /path/to/changed/file.txt - Running command: sleep 10 - Done. ^C Shutting down...
Usually you can only run one command with
wu, but it doesn't prevent you from
running complex command with
bash or other shell command:
wu sh -c 'echo "START" && sleep 5 && echo "END"'
Start watching... - Running command: sh -c echo "START" && sleep 5 && echo "END" START END - Done.
You can specified a pattern to filter the files to watch. Multiple patterns should be seperated by spaces or commas:
wu -pattern="*.js, *.html"
Output (If no command specified,
wu just log changed files):
Start watching... File changed: /path/to/changed/file.js File changed: /path/to/changed/file.html
One practical use case is to use
wu with some light weight web frameworks,
For example, you can start a server written in go by:
wu -pattern="*.go" go run main.go
wu will try to read config file under current directory at the start (default:
you can user
-config flag to specify the config file by hand. Use
-save flag to save
wu -pattern="*.go" -save go build # A `.wu.json` has been created wu # Running `wu` without any options, it will read from `.wu.json`