You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
159 lines
3.6 KiB
159 lines
3.6 KiB
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
|
|
}
|
|
}
|