mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-15 20:17:50 +08:00
113 lines
2.4 KiB
Go
113 lines
2.4 KiB
Go
package eval
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import (
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"errors"
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"io/ioutil"
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"os"
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"os/exec"
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"syscall"
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"github.com/elves/elvish/pkg/eval/vals"
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"github.com/elves/elvish/pkg/parse"
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"github.com/elves/elvish/pkg/util"
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"github.com/xiaq/persistent/hash"
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)
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var (
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// ErrExternalCmdOpts is thrown when an external command is passed Elvish
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// options.
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//
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// TODO: Catch this kind of errors at compilation time.
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ErrExternalCmdOpts = errors.New("external commands don't accept elvish options")
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// ErrImplicitCdNoArg is thrown when an implicit cd form is passed arguments.
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ErrImplicitCdNoArg = errors.New("implicit cd accepts no arguments")
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)
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// ExternalCmd is an external command.
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type ExternalCmd struct {
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Name string
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}
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func (ExternalCmd) Kind() string {
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return "fn"
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}
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func (e ExternalCmd) Equal(a interface{}) bool {
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return e == a
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}
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func (e ExternalCmd) Hash() uint32 {
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return hash.String(e.Name)
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}
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func (e ExternalCmd) Repr(int) string {
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return "<external " + parse.Quote(e.Name) + ">"
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}
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// Call calls an external command.
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func (e ExternalCmd) Call(fm *Frame, argVals []interface{}, opts map[string]interface{}) error {
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if len(opts) > 0 {
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return ErrExternalCmdOpts
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}
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if util.DontSearch(e.Name) {
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stat, err := os.Stat(e.Name)
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if err == nil && stat.IsDir() {
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// implicit cd
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if len(argVals) > 0 {
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return ErrImplicitCdNoArg
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}
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return fm.Chdir(e.Name)
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}
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}
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files := make([]*os.File, len(fm.ports))
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for i, port := range fm.ports {
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if port != nil {
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files[i] = port.File
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}
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}
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args := make([]string, len(argVals)+1)
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for i, a := range argVals {
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// NOTE Maybe we should enfore string arguments instead of coercing all
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// args into string
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args[i+1] = vals.ToString(a)
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}
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path, err := exec.LookPath(e.Name)
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if err != nil {
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return err
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}
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args[0] = path
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sys := makeSysProcAttr(fm.background)
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proc, err := os.StartProcess(path, args, &os.ProcAttr{Files: files, Sys: sys})
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if err != nil {
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return err
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}
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state, err := proc.Wait()
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if err != nil {
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return err
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}
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return NewExternalCmdExit(e.Name, state.Sys().(syscall.WaitStatus), proc.Pid)
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}
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// EachExternal calls f for each name that can resolve to an external
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// command.
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// TODO(xiaq): Windows support
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func EachExternal(f func(string)) {
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for _, dir := range searchPaths() {
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// XXX Ignore error
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infos, _ := ioutil.ReadDir(dir)
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for _, info := range infos {
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if !info.IsDir() && (info.Mode()&0111 != 0) {
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f(info.Name())
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}
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}
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}
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}
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