mirror of
https://github.com/rwxrob/bonzai
synced 2024-11-14 18:12:59 +00:00
73 lines
2.1 KiB
Go
73 lines
2.1 KiB
Go
// Copyright 2022 Robert S. Muhlestein.
|
|
// SPDX-License-Identifier: Apache-2.0
|
|
|
|
package Z
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"os"
|
|
"os/exec"
|
|
"syscall"
|
|
)
|
|
|
|
// SysExec will check for the existence of the first argument as an
|
|
// executable on the system and then execute it using syscall.Exec(),
|
|
// which replaces the currently running program with the new one in all
|
|
// respects (stdin, stdout, stderr, process ID, signal handling, etc).
|
|
// Generally speaking, this is only available on UNIX variations. This
|
|
// is exceptionally faster and cleaner than calling any of the os/exec
|
|
// variations, but it can make your code far be less compatible
|
|
// with different operating systems.
|
|
func SysExec(args ...string) error {
|
|
if len(args) == 0 {
|
|
return fmt.Errorf("missing name of executable")
|
|
}
|
|
path, err := exec.LookPath(args[0])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
// exits the program unless there is an error
|
|
return syscall.Exec(path, args, os.Environ())
|
|
}
|
|
|
|
// Exec checks for existence of first argument as an executable on the
|
|
// system and then runs it without exiting in a way that is supported
|
|
// across all architectures that Go supports. The stdin, stdout, and stderr are
|
|
// connected directly to that of the calling program. Sometimes this is
|
|
// insufficient and the UNIX-specific SysExec is preferred. For example,
|
|
// when handing over control to a terminal editor such as Vim.
|
|
func Exec(args ...string) error {
|
|
if len(args) == 0 {
|
|
return fmt.Errorf("missing name of executable")
|
|
}
|
|
path, err := exec.LookPath(args[0])
|
|
if err != nil {
|
|
return err
|
|
}
|
|
cmd := exec.Command(path, args[1:]...)
|
|
cmd.Stdout = os.Stdout
|
|
cmd.Stdin = os.Stdin
|
|
cmd.Stderr = os.Stderr
|
|
return cmd.Run()
|
|
}
|
|
|
|
// Out returns the standard output of the executed command as
|
|
// a string. Errors are logged but not returned.
|
|
func Out(args ...string) string {
|
|
if len(args) == 0 {
|
|
log.Println("missing name of executable")
|
|
return ""
|
|
}
|
|
path, err := exec.LookPath(args[0])
|
|
if err != nil {
|
|
log.Println(err)
|
|
return ""
|
|
}
|
|
out, err := exec.Command(path, args[1:]...).Output()
|
|
if err != nil {
|
|
log.Println(err)
|
|
}
|
|
return string(out)
|
|
}
|