/
cmd.go
107 lines (91 loc) · 1.82 KB
/
cmd.go
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package main
import (
"fmt"
"io"
"os"
"os/exec"
"strings"
)
type Executable interface {
Exec(string, ...string) Executable
Setcmd(*exec.Cmd) Executable
SetStdin(io.Reader) Executable
SetStdout(io.Writer) Executable
SetStderr(io.Writer) Executable
Setdir(string) Executable
Setenv([]string) Executable
Getenv() []string
Run() error
Out() ([]byte, error)
FormatOutput([]byte) string
FormatError(error, []byte) error
}
type Cmd struct {
name string
args []string
cmd *exec.Cmd
stdin io.Reader
stdout, stderr io.Writer
}
func NewCmd() Executable {
return &Cmd{
stdin: os.Stdin,
stdout: os.Stdout,
stderr: os.Stderr,
}
}
func (c *Cmd) Exec(name string, args ...string) Executable {
c.name = name
c.args = args
c.cmd = exec.Command(name, args...)
return c
}
func (c *Cmd) Setcmd(cmd *exec.Cmd) Executable {
c.cmd = cmd
return c
}
func (c *Cmd) SetStdin(stdin io.Reader) Executable {
c.stdin = stdin
return c
}
func (c *Cmd) SetStdout(stdout io.Writer) Executable {
c.stdout = stdout
return c
}
func (c *Cmd) SetStderr(stderr io.Writer) Executable {
c.stderr = stderr
return c
}
func (c *Cmd) Setdir(dir string) Executable {
if c.cmd != nil {
c.cmd.Dir = dir
}
return c
}
func (c *Cmd) Setenv(env []string) Executable {
if c.cmd != nil {
c.cmd.Env = env
}
return c
}
func (c *Cmd) Getenv() []string {
if c.cmd != nil {
return c.cmd.Env
}
return []string{}
}
func (c *Cmd) Run() error {
c.cmd.Stdin = c.stdin
c.cmd.Stdout = c.stdout
c.cmd.Stderr = c.stderr
return c.cmd.Run()
}
func (c *Cmd) Out() ([]byte, error) {
return c.cmd.CombinedOutput()
}
func (c *Cmd) FormatOutput(out []byte) string {
return strings.TrimSpace(string(out))
}
func (c *Cmd) FormatError(err error, out []byte) error {
return fmt.Errorf("%v: %s", err, c.FormatOutput(out))
}