gosu is a task runner and file watcher for golang in the spirit of rake, gulp.
To install
go get -u github.com/mgutz/gosu/cmd/gosu
As an example, create a file "tasks/Gosufile.go" with this content
package main
import (
. "github.com/mgutz/gosu"
)
func Tasks(p *Project) {
p.Task("default", D{"hello", "views"})
p.Task("hello", func() {
Run(`bash -c "echo Hello $USER!"`)
})
p.Task("views", "Compiles razor templates", W{"**/*.go.html"}, func(c *Context) {
Run(`razor views`)
})
p.Task("server", D{"views"}, W{"**/*.go"}, Debounce(3000), func() {
// Start recompiles and restarts on changes when watching
Start("main.go", M{"Dir": "example"})
})
}
func main() {
Gosu(Tasks)
}
To run "views" task from terminal
gosu views
To rerun "views" whenever any *.go.html file changes
gosu views --watch
To run the "default" task which runs "hello" and "views"
gosu
Task names may add a "?" suffix meaning only run once even when watching
// build once regardless of number of dependees
p.Task("build?", func() {})
Task options
D{} or Dependencies{} - dependent tasks which run before task
Debounce - minimum milliseconds before task can run again
W{} or Watches{} - array of glob file patterns to watch
/**/ - match zero or more directories
{a,b} - match a or b, no spaces
* - match any non-separator char
? - match a single non-separator char
**/ - match any directory, start of pattern only
/** - match any this directory, end of pattern only
! - removes files from resultset, start of pattern only
Task handlers
func() {} - Simple function handler
func(c *Context) {} - Handler which accepts the current context
Exec functions
// Runs a command and captures its output.
Run(command, options...)
// capture output of shell command
output, _ := Run(`bash -c "echo -n $HOME")
// run main executable inside of cmd/app and set environment var FOO
Run("main", &Cmd{Wd: "cmd/app", Env: []string{"FOO=bar")})
// Start an async command. If executable has suffix ".go" then it will
// be "go install"ed then executed. Use this for watching a server task.
Start(command, options...)