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package command
import (
"log"
"os/exec"
"strings"
"syscall"
)
// Mode indicates that whether command should run native code or use git
// command to operate.
type Mode uint8
const (
// ModeLegacy uses traditional git command line tool to operate
ModeLegacy = iota
// ModeNative uses native implementation of given git command
ModeNative
)
// Run runs the OS command and return its output. If the output
// returns error it also encapsulates it as a golang.error which is a return code
// of the command except zero
func Run(d string, c string, args []string) (string, error) {
cmd := exec.Command(c, args...)
if d != "" {
cmd.Dir = d
}
output, err := cmd.CombinedOutput()
return trimTrailingNewline(string(output)), err
}
// Return returns if we supposed to get return value as an int of a command
// this method can be used. It is practical when you use a command and process a
// failover according to a specific return code
func Return(d string, c string, args []string) (int, error) {
cmd := exec.Command(c, args...)
if d != "" {
cmd.Dir = d
}
var err error
// this time the execution is a little different
if err := cmd.Start(); err != nil {
return -1, err
}
if err := cmd.Wait(); err != nil {
if exiterr, ok := err.(*exec.ExitError); ok {
// The program has exited with an exit code != 0
// This works on both Unix and Windows. Although package
// syscall is generally platform dependent, WaitStatus is
// defined for both Unix and Windows and in both cases has
// an ExitStatus() method with the same signature.
if status, ok := exiterr.Sys().(syscall.WaitStatus); ok {
statusCode := status.ExitStatus()
return statusCode, err
}
} else {
log.Fatalf("cmd.Wait: %v", err)
}
}
return -1, err
}
// trimTrailingNewline removes the trailing new line form a string. this method
// is used mostly on outputs of a command
func trimTrailingNewline(s string) string {
if strings.HasSuffix(s, "\n") || strings.HasSuffix(s, "\r") {
return s[:len(s)-1]
}
return s
}
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