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package eval
import (
"errors"
"io/ioutil"
"os"
"os/exec"
"syscall"
"github.com/elves/elvish/eval/vals"
"github.com/elves/elvish/parse"
"github.com/elves/elvish/util"
"github.com/xiaq/persistent/hash"
)
var (
ErrExternalCmdOpts = errors.New("external commands don't accept elvish options")
ErrCdNoArg = errors.New("implicit cd accepts no arguments")
)
// ExternalCmd is an external command.
type ExternalCmd struct {
Name string
}
func (ExternalCmd) Kind() string {
return "fn"
}
func (e ExternalCmd) Equal(a interface{}) bool {
return e == a
}
func (e ExternalCmd) Hash() uint32 {
return hash.String(e.Name)
}
func (e ExternalCmd) Repr(int) string {
return "<external " + parse.Quote(e.Name) + ">"
}
// Call calls an external command.
func (e ExternalCmd) Call(fm *Frame, argVals []interface{}, opts map[string]interface{}) error {
if len(opts) > 0 {
return ErrExternalCmdOpts
}
if util.DontSearch(e.Name) {
stat, err := os.Stat(e.Name)
if err == nil && stat.IsDir() {
// implicit cd
if len(argVals) > 0 {
return ErrCdNoArg
}
return fm.Chdir(e.Name)
}
}
files := make([]*os.File, len(fm.ports))
for i, port := range fm.ports {
files[i] = port.File
}
args := make([]string, len(argVals)+1)
for i, a := range argVals {
// NOTE Maybe we should enfore string arguments instead of coercing all
// args into string
args[i+1] = vals.ToString(a)
}
path, err := exec.LookPath(e.Name)
if err != nil {
return err
}
args[0] = path
sys := makeSysProcAttr(fm.background)
proc, err := os.StartProcess(path, args, &os.ProcAttr{Files: files, Sys: sys})
if err != nil {
return err
}
state, err := proc.Wait()
if err != nil {
return err
}
return NewExternalCmdExit(e.Name, state.Sys().(syscall.WaitStatus), proc.Pid)
}
// EachExternal calls f for each name that can resolve to an external
// command.
// TODO(xiaq): Windows support
func EachExternal(f func(string)) {
for _, dir := range searchPaths() {
// XXX Ignore error
infos, _ := ioutil.ReadDir(dir)
for _, info := range infos {
if !info.IsDir() && (info.Mode()&0111 != 0) {
f(info.Name())
}
}
}
}
|
