/
main.go
60 lines (49 loc) · 1.21 KB
/
main.go
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package main
import (
"fmt"
"log"
"os"
"os/exec"
"path"
"strings"
"github.com/adrg/xdg"
"github.com/gosimple/slug"
"github.com/juju/fslock"
)
const appName = "thro"
const deferPrefix = "defer-"
var stateDir = path.Join(xdg.StateHome, appName)
func main() {
prepareStateDir()
args := os.Args[1:]
cmd := exec.Command(args[0], args[1:]...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
cmdStr := strings.Join(args, " ")
lockfile := path.Join(stateDir, slug.Make(cmdStr))
deferLockfile := path.Join(stateDir, deferPrefix+slug.Make(cmdStr))
lock := fslock.New(lockfile)
if err := lock.TryLock(); err == nil {
defer os.Remove(lockfile)
defer lock.Unlock()
_ = cmd.Run()
return
}
deferred := fslock.New(deferLockfile)
if err := deferred.TryLock(); err == nil {
_ = lock.Lock()
defer os.Remove(deferLockfile)
defer lock.Unlock()
_ = deferred.Unlock()
_ = cmd.Run()
}
}
func prepareStateDir() {
if _, err := os.Stat(stateDir); os.IsNotExist(err) {
if err := os.MkdirAll(stateDir, os.ModePerm); err != nil {
log.Fatal(fmt.Errorf("thro: unable to create state directory %s: %w", stateDir, err))
}
} else if err != nil {
log.Fatalf("thro: unable to read state directory: %s", stateDir)
}
}