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cmd.go
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cmd.go
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package bs
import (
"errors"
"fmt"
"io"
"os"
"os/exec"
"strings"
"github.com/danbrakeley/commandline"
)
// Command is intended to be built via the Cmd() funcs.
// Generally you call a "starter", which returns a *Command,
// then call zero or more "modifiers" to tweak the *Command,
// then call a "runner" to actually run the *Command.
type Command struct {
raw string
env []string
in io.Reader // the stdin to attach to this process
out io.Writer // the stdout to attach to this process
err io.Writer // the stderr to attach to this process
exitStatus *int // exit status code
fnClose func()
}
// Command starters
func Cmd(command string) *Command {
return &Command{
raw: command,
in: defaultStdin,
out: defaultStdout,
err: defaultStderr,
}
}
func Cmdf(format string, args ...interface{}) *Command {
return Cmd(fmt.Sprintf(format, args...))
}
// Command modifiers
func (c *Command) In(in io.Reader) *Command {
c.in = in
return c
}
func (c *Command) Out(out io.Writer) *Command {
c.out = out
return c
}
func (c *Command) Err(out io.Writer) *Command {
c.err = out
return c
}
func (c *Command) OutErr(out io.Writer) *Command {
c.out = out
c.err = out
return c
}
func (c *Command) ExitStatus(n *int) *Command {
c.exitStatus = n
return c
}
// ExpandEnv calls os.ExpandEnv on the command string before it is parsed and passed to exec.Cmd.
func (c *Command) ExpandEnv() *Command {
c.raw = os.ExpandEnv(c.raw)
return c
}
// Env adds environment variables in the form "KEY=VALUE", to be set on exec.Cmd.Env.
// Note: these env vars are not seen by ExpandEnv.
func (c *Command) Env(vars ...string) *Command {
c.env = append(c.env, vars...)
return c
}
// Command runners
func (c *Command) Run() {
if err := c.run(); err != nil {
fnErrorHandler(err)
}
}
func (c *Command) RunStr() string {
var b strings.Builder
c.out = &b
c.err = &b
if err := c.run(); err != nil {
fnErrorHandler(err)
}
return b.String()
}
func (c *Command) RunErr() error {
return c.run()
}
func (c *Command) RunExitStatus() int {
n, err := extractExitStatus(c.run())
if err != nil {
fnErrorHandler(err)
}
return n
}
func (c *Command) Bash() {
if err := c.bash(); err != nil {
fnErrorHandler(err)
}
}
func (c *Command) BashStr() string {
var b strings.Builder
c.out = &b
c.err = &b
if err := c.bash(); err != nil {
fnErrorHandler(err)
}
return b.String()
}
func (c *Command) BashErr() error {
return c.bash()
}
func (c *Command) BashExitStatus() int {
n, err := extractExitStatus(c.bash())
if err != nil {
fnErrorHandler(err)
}
return n
}
// helpers
func (c *Command) run() error {
args, err := commandline.Parse(c.raw)
if err != nil {
return err
}
Verbosef("Exec: %s", c.raw)
cmd := exec.Command(args[0], args[1:]...)
if len(c.env) > 0 {
Verbosef("+Env: %v", c.env)
cmd.Env = append(os.Environ(), c.env...)
}
cmd.Stdin = c.in
cmd.Stdout = c.out
cmd.Stderr = c.err
err = cmd.Run()
if c.exitStatus != nil {
n, e := extractExitStatus(err)
if e == nil {
*c.exitStatus = n
}
}
return err
}
func (c *Command) bash() error {
Verbosef("Bash: %s", c.raw)
cmd := exec.Command("bash", "-c", c.raw)
if len(c.env) > 0 {
Verbosef("+Env: %v", c.env)
cmd.Env = append(os.Environ(), c.env...)
}
cmd.Stdin = c.in
cmd.Stdout = c.out
cmd.Stderr = c.err
err := cmd.Run()
if c.exitStatus != nil {
n, e := extractExitStatus(err)
if e == nil {
*c.exitStatus = n
}
}
return err
}
func extractExitStatus(err error) (int, error) {
if err == nil {
return 0, nil
}
var ee *exec.ExitError
if !errors.As(err, &ee) {
return -1, err
}
return ee.ExitCode(), nil
}