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package common
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"os"
"os/signal"
"strings"
)
var (
GoPath = os.Getenv("GOPATH")
)
func TrapSignal(cb func()) {
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
signal.Notify(c, os.Kill)
go func() {
for sig := range c {
fmt.Printf("captured %v, exiting...\n", sig)
if cb != nil {
cb()
}
os.Exit(1)
}
}()
select {}
}
func Exit(s string) {
fmt.Printf(s + "\n")
os.Exit(1)
}
func EnsureDir(dir string, mode os.FileMode) error {
if _, err := os.Stat(dir); os.IsNotExist(err) {
err := os.MkdirAll(dir, mode)
if err != nil {
return fmt.Errorf("Could not create directory %v. %v", dir, err)
}
}
return nil
}
func IsDirEmpty(name string) (bool, error) {
f, err := os.Open(name)
if err != nil {
return true, err //folder is non-existent
}
defer f.Close()
_, err = f.Readdirnames(1) // Or f.Readdir(1)
if err == io.EOF {
return true, nil
}
return false, err // Either not empty or error, suits both cases
}
func FileExists(filePath string) bool {
_, err := os.Stat(filePath)
return !os.IsNotExist(err)
}
func ReadFile(filePath string) ([]byte, error) {
return ioutil.ReadFile(filePath)
}
func MustReadFile(filePath string) []byte {
fileBytes, err := ioutil.ReadFile(filePath)
if err != nil {
Exit(Fmt("MustReadFile failed: %v", err))
return nil
}
return fileBytes
}
func WriteFile(filePath string, contents []byte, mode os.FileMode) error {
err := ioutil.WriteFile(filePath, contents, mode)
if err != nil {
return err
}
// fmt.Printf("File written to %v.\n", filePath)
return nil
}
func MustWriteFile(filePath string, contents []byte, mode os.FileMode) {
err := WriteFile(filePath, contents, mode)
if err != nil {
Exit(Fmt("MustWriteFile failed: %v", err))
}
}
// Writes to newBytes to filePath.
// Guaranteed not to lose *both* oldBytes and newBytes,
// (assuming that the OS is perfect)
func WriteFileAtomic(filePath string, newBytes []byte, mode os.FileMode) error {
// If a file already exists there, copy to filePath+".bak" (overwrite anything)
if _, err := os.Stat(filePath); !os.IsNotExist(err) {
fileBytes, err := ioutil.ReadFile(filePath)
if err != nil {
return fmt.Errorf("Could not read file %v. %v", filePath, err)
}
err = ioutil.WriteFile(filePath+".bak", fileBytes, mode)
if err != nil {
return fmt.Errorf("Could not write file %v. %v", filePath+".bak", err)
}
}
// Write newBytes to filePath.new
err := ioutil.WriteFile(filePath+".new", newBytes, mode)
if err != nil {
return fmt.Errorf("Could not write file %v. %v", filePath+".new", err)
}
// Move filePath.new to filePath
err = os.Rename(filePath+".new", filePath)
return err
}
//--------------------------------------------------------------------------------
func Tempfile(prefix string) (*os.File, string) {
file, err := ioutil.TempFile("", prefix)
if err != nil {
PanicCrisis(err)
}
return file, file.Name()
}
func Tempdir(prefix string) (*os.File, string) {
tempDir := os.TempDir() + "/" + prefix + RandStr(12)
err := EnsureDir(tempDir, 0700)
if err != nil {
panic(Fmt("Error creating temp dir: %v", err))
}
dir, err := os.Open(tempDir)
if err != nil {
panic(Fmt("Error opening temp dir: %v", err))
}
return dir, tempDir
}
//--------------------------------------------------------------------------------
func Prompt(prompt string, defaultValue string) (string, error) {
fmt.Print(prompt)
reader := bufio.NewReader(os.Stdin)
line, err := reader.ReadString('\n')
if err != nil {
return defaultValue, err
} else {
line = strings.TrimSpace(line)
if line == "" {
return defaultValue, nil
}
return line, nil
}
}
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