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|
// Run a command whenever a file is modified.
package main
import (
"flag"
"fmt"
"os"
"os/exec"
"runtime/debug"
"strings"
"time"
"github.com/fsnotify/fsnotify"
)
// Colors in escape sequences
var (
Reset = "\033[0m"
Cyan = "\033[36m"
)
var (
// Path in which to look for commands
Path string
// Command run for building
BuildCommand []string
// Command run after build
RunCommand []string
// Command will only run on files that have the Suffixes extension
Suffixes []string
// Layout for timestamp of command
DateLayout string = "15:04:05"
// Version tag for wbr
Version string
)
func GetVersion() string {
if Version != "" {
return Version
}
buildinfo, ok := debug.ReadBuildInfo()
if !ok {
panic("Could not read buildinfo to know package version.")
}
return buildinfo.Main.Version
}
func CompileRun(fileName string) {
found := false
for _, Ext := range Suffixes {
if strings.HasSuffix(fileName, Ext) {
found = true
break
}
}
if !found {
return
}
// Build the program, exit if return if there was an error
if len(BuildCommand) > 0 && BuildCommand[0] != "" {
var buildCmd *exec.Cmd
if len(BuildCommand) > 1 {
buildCmd = exec.Command(BuildCommand[0], append(BuildCommand[1:], fileName)...)
} else {
buildCmd = exec.Command(BuildCommand[0], fileName)
}
// run the build command
out, err := buildCmd.CombinedOutput()
date := time.Now().Format(DateLayout)
if len(BuildCommand) > 1 {
fmt.Printf("[%s %s%s %s%s]\n", date, Cyan, BuildCommand[0], strings.Join(append(BuildCommand[1:], fileName), " "), Reset)
} else {
fmt.Printf("[%s %s%s %s %s%s]\n", date, Cyan, BuildCommand[0], BuildCommand, fileName, Reset)
}
if len(out) > 0 {
fmt.Printf("%s", out)
}
if err != nil {
if _, ok := err.(*exec.ExitError); ok {
return
} else if !ok {
panic(err)
}
}
}
if len(RunCommand) > 0 && RunCommand[0] != "" {
// There was no error in the build so we can execute the run command
var runCmd *exec.Cmd
if len(RunCommand) > 1 {
runCmd = exec.Command(RunCommand[0], RunCommand[1:]...)
} else {
runCmd = exec.Command(RunCommand[0])
}
date := time.Now().Format(DateLayout)
out, err := runCmd.CombinedOutput()
if len(RunCommand) > 1 {
fmt.Printf("[%s %s%s %s%s]\n", date, Cyan, RunCommand[0], strings.Join(RunCommand[1:], " "), Reset)
} else {
fmt.Printf("[%s %s%s%s]\n", date, Cyan, RunCommand[0], Reset)
}
if len(out) > 0 {
fmt.Printf("%s", out)
}
if err != nil {
if _, ok := err.(*exec.ExitError); ok {
return
} else if !ok {
panic(err)
}
}
}
}
func main() {
watcher, err := fsnotify.NewWatcher()
if err != nil {
panic(err)
}
defer watcher.Close()
bc := flag.String("b", "", "Command to run for building, it will pass the file modified as argument to it")
rc := flag.String("r", "", "Command for running after build")
s := flag.String("s", "", "Filter watched files by suffix, specify multiple by separating with ','")
p := flag.String("p", ".", "Path to watch for files")
v := flag.Bool("v", false, "Show wbr version")
flag.Parse()
if *v {
fmt.Printf("wbr %s\n", GetVersion())
os.Exit(0)
}
BuildCommand = strings.Split(*bc, " ")
RunCommand = strings.Split(*rc, " ")
Suffixes = strings.Split(*s, ",")
Path = *p
fmt.Printf("[%s watching '%s'%s]\n", Cyan, Path, Reset)
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Has(fsnotify.Write) {
CompileRun(event.Name)
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
fmt.Println("error:", err)
}
}
}()
err = watcher.Add(Path)
if err != nil {
panic(err)
}
<-make(chan struct{})
}
|
