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// Package exec runs external commands. It wraps os.exec to
// allow using full command string as arguments,
// and provides functions
// of providing (stdin, stdout, stderr) channel for
// (stdin, stdout, stderr) pipe.
//
// Attention, this package is experimental.
package exec
import (
"bufio"
"errors"
"io"
"os/exec"
"strings"
)
type Cmd struct {
*exec.Cmd
}
// Command returns the Cmd struct to execute the command.
// No need to split the path and arguments.
// The error may be caused by unclosed quote.
func Command(name string) (*Cmd, error) {
path, argv, err := parseCommandName(name)
if err != nil {
return nil, err
}
return &Cmd{exec.Command(path, argv...)}, nil
}
// StdoutChannel returns a channel that will be connected to
// the command's standard error when the command starts.
// It closes when StdoutPipe closed.
func (c *Cmd) StdoutChannel() (chan string, error) {
ch := make(chan string, 100)
pipe, err := c.StdoutPipe()
if err != nil {
return nil, err
}
reader := bufio.NewReader(pipe)
go func() {
for {
str, err := reader.ReadString('\n')
if err != nil {
if err == io.EOF {
if str != "" {
ch <- str
}
}
close(ch)
return
}
if str != "" {
ch <- str
}
}
}()
return ch, nil
}
// StderrChannel returns a channel that will be connected to
// the command's standard error when the command starts.
// It closes when StderrPipe closed.
func (c *Cmd) StderrChannel() (chan string, error) {
ch := make(chan string, 100)
pipe, err := c.StderrPipe()
if err != nil {
return nil, err
}
reader := bufio.NewReader(pipe)
go func() {
for {
str, err := reader.ReadString('\n')
if err != nil {
if err == io.EOF {
if str != "" {
ch <- str
}
}
close(ch)
return
}
if str != "" {
ch <- str
}
}
}()
return ch, nil
}
// StdinChannel returns a channel that will be connected to
// the command's standard error when the command starts.
func (c *Cmd) StdinChannel() (chan string, error) {
ch := make(chan string, 100)
pipe, err := c.StdinPipe()
if err != nil {
return nil, err
}
writer := bufio.NewWriter(pipe)
go func() {
for {
select {
case str := <-ch:
writer.WriteString(str)
}
}
}()
return ch, nil
}
// parseCommandName split the full command into path and arguments.
func parseCommandName(name string) (string, []string, error) {
if len(strings.Trim(name, " ")) == 0 {
return "", nil, errors.New("no command given")
}
var (
quoted bool = false
quotation rune
tmp []rune = make([]rune, 0)
argv []string = make([]string, 0)
)
for _, b := range name {
switch b {
case ' ':
if quoted {
tmp = append(tmp, b)
} else {
if len(strings.Trim(string(tmp), " ")) > 0 {
argv = append(argv, string(tmp))
}
tmp = make([]rune, 0)
}
case '"':
if quoted {
if quotation == '"' {
quoted, quotation = false, '_'
argv = append(argv, string(tmp))
tmp = make([]rune, 0)
} else {
tmp = append(tmp, b)
}
} else {
quoted, quotation = true, '"'
}
case '\'':
if quoted {
if quotation == '\'' {
quoted, quotation = false, '_'
argv = append(argv, string(tmp))
tmp = make([]rune, 0)
} else {
tmp = append(tmp, b)
}
} else {
quoted, quotation = true, '\''
}
default:
tmp = append(tmp, b)
}
}
if len(strings.Trim(string(tmp), " ")) > 0 {
argv = append(argv, string(tmp))
}
path := argv[0]
var arg []string
if len(argv) > 1 {
arg = argv[1:]
}
if quoted {
return path, arg, errors.New("unclosed quote")
}
return path, arg, nil
}
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