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package command
import (
"log"
"os/exec"
"strings"
"syscall"
)
// RunCommandWithOutput 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 RunCommandWithOutput(dir string, command string, args []string) (string, error) {
cmd := exec.Command(command, args...)
if dir != "" {
cmd.Dir = dir
}
output, err := cmd.CombinedOutput()
return string(output), err
}
// GetCommandStatus 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 acoording to a soecific return code
func GetCommandStatus(dir string, command string, args []string) (int, error) {
cmd := exec.Command(command, args...)
if dir != "" {
cmd.Dir = dir
}
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(str string) string {
if strings.HasSuffix(str, "\n") {
return str[:len(str)-1]
}
return str
}
// GenericGitCommand runs any git command without expecting output
func GenericGitCommand(repoPath string, args []string) error {
_, err := RunCommandWithOutput(repoPath, "git", args)
if err != nil {
return err
}
return nil
}
// GenericGitCommandWithOutput runs any git command with returning output
func GenericGitCommandWithOutput(repoPath string, args []string) (string, error) {
out, err := RunCommandWithOutput(repoPath, "git", args)
if err != nil {
return out, err
}
return TrimTrailingNewline(out), nil
}
// GenericGitCommandWithErrorOutput runs any git command with returning output
func GenericGitCommandWithErrorOutput(repoPath string, args []string) (string, error) {
out, err := RunCommandWithOutput(repoPath, "git", args)
if err != nil {
return TrimTrailingNewline(out), err
}
return TrimTrailingNewline(out), nil
}
// GitShow is conventional git show command without any argument
func GitShow(repoPath, hash string) string {
args := []string{"show", hash}
diff, err := RunCommandWithOutput(repoPath, "git", args)
if err != nil {
return "?"
}
return diff
}
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