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external.go
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external.go
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package notes
import (
"github.com/pkg/errors"
"os"
"os/exec"
"path/filepath"
"regexp"
)
// Note: External command name must consist of alphabets, numbers, dash '-' and underscore '_'.
var (
reExtractCmdName = regexp.MustCompile(`^expected command but got "([[:alnum:]_-]+)"$`)
)
// ExternalCmd represents user-defined subcommand
type ExternalCmd struct {
// ExePath is a path to executable of the external subcommand
ExePath string
// Args is arguments passed to external subcommand. Arguments specified to `notes` are forwarded
Args []string
// NotesPath is an executable path of the `notes` command. This is passed to the first argument of external subcommand
NotesPath string
}
// Do invokes external subcommand with exec. If it did not exit successfully this function returns an error
func (cmd *ExternalCmd) Do() error {
args := append([]string{cmd.NotesPath}, cmd.Args...)
c := exec.Command(cmd.ExePath, args...)
c.Stdout = os.Stdout
c.Stderr = os.Stderr
c.Stdin = os.Stdin
if err := c.Run(); err != nil {
name := filepath.Base(cmd.ExePath)
return errors.Wrapf(err, "External command '%s' did not exit successfully", name)
}
return nil
}
// NewExternalCmd creates ExternalCmd instance from given error and arguments. The error must be parse
// error of kingpin.Parse(). When the missing subcommand is not detected in the error message, this
// function returns false as 2nd return value
func NewExternalCmd(fromErr error, args []string) (*ExternalCmd, bool) {
match := reExtractCmdName.FindSubmatch([]byte(fromErr.Error()))
if match == nil {
return nil, false
}
exe, err := exec.LookPath("notes-" + string(match[1]))
if err != nil {
return nil, false
}
notes, err := os.Executable()
if err != nil {
return nil, false
}
return &ExternalCmd{
ExePath: exe,
Args: args,
NotesPath: notes,
}, true
}