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/*******************************************************************************
*
* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*
*******************************************************************************/
package cli
import (
"fmt"
"io"
"os/exec"
"strings"
)
//Command describes a command that can be run using the methods in the
//Implementation interface.
type Command struct {
Program []string
WorkDir string
}
type commandError struct {
Cmd Command
Err error
}
func (e commandError) Error() string {
cmdline := strings.Join(e.Cmd.Program, " ")
if e.Cmd.WorkDir == "" {
return fmt.Sprintf("exec `%s`: %s",
cmdline, e.Err.Error(),
)
}
return fmt.Sprintf("exec `%s` in %s: %s",
cmdline, e.Cmd.WorkDir, e.Err.Error(),
)
}
//CommandRunner is a function that can execute commands given to it.
//This interface is only useful for unit tests; the default CommandRunner
//suffices for all regular operation.
type CommandRunner func(c Command, stdin io.Reader, stdout, stderr io.Writer) error
//DefaultCommandRunner is a CommandRunner that actually executes the command.
func DefaultCommandRunner(c Command, stdin io.Reader, stdout, stderr io.Writer) error {
cmd := exec.Command(c.Program[0], c.Program[1:]...)
cmd.Stdin = stdin
cmd.Stdout = stdout
cmd.Stderr = stderr
cmd.Dir = c.WorkDir
err := cmd.Run()
if err != nil {
err = commandError{c, err}
}
return err
}
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