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inl.go
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inl.go
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package main
import (
"flag"
"fmt"
"os"
"os/exec"
"path/filepath"
"regexp"
"strings"
"time"
tm "github.com/buger/goterm"
"github.com/fsnotify/fsnotify"
)
var (
verbose = flag.Bool("v", false, "verbose logging")
excludeDir = flag.String("ed", `^\.`, "regular expression of directory basenames to exclude from watching")
excludeFile = flag.String("e", `(^.*\.sw[px]$)|(/4913$)`, "regular expression of files to exclude when watching")
includeFile = flag.String("i", `.*`, "regular expression of files to include when watching")
throttle = flag.Duration("t", time.Millisecond*100, "a duration of time to wait between a filesystem event and triggering the action")
cooldown = flag.Duration("c", 0, "a duration of time to wait between executing the command and the next watch")
noWait = flag.Bool("n", false, "do not wait for the action to run to completion, use sigkill on the next filesystem change")
)
func main() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "usage: inl SHELL-COMMAND\n")
flag.PrintDefaults()
os.Exit(1)
}
flag.Parse()
if len(flag.Args()) < 1 {
flag.Usage()
}
log.Clear()
cmd := invoke()
path, err := filepath.Abs("./")
check(err)
// If the current directory is a symlink, follow it.
path, err = filepath.EvalSymlinks(path)
check(err)
for {
watchLoop(path)
time.Sleep(*throttle)
if cmd != nil {
log.Warningf("killing process %d", cmd.Process.Pid)
cmd.Process.Signal(os.Kill)
cmd.Wait()
}
cmd = invoke()
time.Sleep(*cooldown)
}
}
// Recursively watch a filesystem path.
func watchLoop(path string) {
log.Debugf("establishing watches...")
watcher, err := fsnotify.NewWatcher()
check(err)
defer watcher.Close()
dircount := 0
excludeDirRegexp := regexp.MustCompile(*excludeDir)
excludeFileRegexp := regexp.MustCompile(*excludeFile)
includeFileRegexp := regexp.MustCompile(*includeFile)
err = filepath.Walk(path, func(path string, f os.FileInfo, err error) error {
// TODO add an option to follow symlinks.
if !f.IsDir() {
return nil
}
log.Debugf("watch directory candidate '%s'", path)
if excludeDirRegexp.MatchString(f.Name()) {
return filepath.SkipDir
}
log.Debugf("watching '%s'", path)
check(watcher.Add(path))
dircount++
return nil
})
check(err)
if dircount < 1 {
panic("unable to establish watches: no directories found")
}
log.Infof("watching '%s' +%d", path, dircount-1)
for {
select {
case event := <-watcher.Events:
log.Debugf("event: %+v", event)
if excludeFileRegexp.MatchString(event.Name) || !includeFileRegexp.MatchString(event.Name) {
log.Debugf("ignoring event: %+v", event)
break
}
// Ticker fired. There was a lull in events and we can now process.
log.Ln()
log.Ln()
log.Ln()
log.Infof(strings.Repeat("=", 80))
log.Clear()
log.Infof("change detected: %+v", event)
return
case err := <-watcher.Errors:
check(err)
}
}
}
func invoke() *exec.Cmd {
args := []string{"/bin/bash", "-c", "--", strings.Join(flag.Args(), " ")}
cmd := exec.Command(args[0], args[1:]...)
log.Infof("executing command: %+q", args)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
log.Ln()
check(cmd.Start())
if !*noWait {
cmd.Wait()
log.Ln()
if cmd.ProcessState.Success() {
log.Infof(cmd.ProcessState.String())
} else {
log.Errorf(cmd.ProcessState.String())
}
cmd = nil
}
return cmd
}
func check(err error) {
if err != nil {
panic(err)
}
}
type Log struct{}
func (l Log) Infof(f string, i ...interface{}) {
l.Sayf(tm.GREEN, f, i...)
}
func (l Log) Errorf(f string, i ...interface{}) {
l.Sayf(tm.RED, f, i...)
}
func (l Log) Warningf(f string, i ...interface{}) {
l.Sayf(tm.YELLOW, f, i...)
}
func (_ Log) Sayf(color int, f string, i ...interface{}) {
s := fmt.Sprintf(f, i...)
tm.Println(tm.Color(tm.Bold("[INL] "), color) + s)
tm.Flush()
}
func (l Log) Debugf(f string, i ...interface{}) {
if !*verbose {
return
}
l.Infof(f, i...)
}
func (_ Log) Clear() {
tm.Clear()
tm.MoveCursor(1, 1)
tm.Flush()
}
func (_ Log) Ln() {
tm.Println()
tm.Flush()
}
var log Log