func bflag(c cmd.Ctx) error {
args := c.Args
xprintf("bflag...\n")
if len(args) != 2 || len(args[1]) == 0 || args[1][0] != '-' && args[1][0] != '+' {
return errors.New("usage: flag ±flags")
}
flg := args[1]
set := flg[0] == '+'
for _, r := range flg[1:] {
switch r {
case 'D':
debug = set
case 'V':
verb = set
debug = set
case 'N':
debugNs = set
default:
c.Warn("unknown flag '%c'", r)
return errors.New("unknown flag")
}
}
debugYacc = debug
debugExec = verb
cmd.Debug = debugNs
return nil
}
func btype(c cmd.Ctx) error {
args := c.Args
if len(args) == 1 {
return errors.New("usage: type name...")
}
for _, nm := range args[1:] {
c.Printf("%s: %s\n", nm, ntype(nm))
}
return nil
}
func becho(c cmd.Ctx) error {
args := c.Args[1:]
nl := "\n"
if len(args) >= 1 && args[0] == "-n" {
nl = ""
args = args[1:]
}
str := strings.Join(args, " ")
c.Printf("%s%s", str, nl)
return nil
}
func bpwd(c cmd.Ctx) error {
args := c.Args
if len(args) > 1 {
return errors.New("extra args to pwd")
}
s, err := os.Getwd()
if err != nil {
return err
}
c.Printf("%s\n", s)
return nil
}
func (nd *Nd) xExec() error {
xprintf("x %s\n", nd)
err := nd.redirs()
if err != nil {
xprintf("x %s done\n", nd)
nd.closeAll()
nd.waitc <- err
return err
}
args := nd.names()
if len(args) == 0 {
xprintf("x %s done\n", nd)
err = errors.New("no name for command")
nd.closeAll()
nd.waitc <- err
return err
}
fname := LookCmd(args[0])
name := args[0]
fn := bltin[name]
if fn != nil {
ctx := cmd.Ctx{
Stdin: nd.Stdin,
Stdout: nd.Stdout,
Stderr: nd.Stderr,
Intrc: nd.intrc,
Args: args,
}
go func() {
err := fn(ctx)
if err != nil {
ctx.Warn("%s", err)
}
nd.closeAll()
xprintf("x %s done\n", nd)
nd.waitc <- err
xprintf("x %s waitc done\n", nd)
}()
return nil
}
fns := funcs[name]
if fns != nil {
bdy := fns.Child[0]
bdy.mkExec(nd.Stdin, nd.Stdout, nd.Stderr, args[1:]...)
err = bdy.xCmds()
if err != nil {
nd.closeAll()
nd.waitc <- err
return err
}
go func() {
err := bdy.wait()
nd.closeAll()
xprintf("x %s done\n", nd)
nd.waitc <- err
}()
return nil
}
if nd.interrupted() {
err = errors.New("interrupted")
nd.closeAll()
xprintf("x %s done\n", nd)
nd.waitc <- err
return err
}
nd.x = exec.Command(fname, args[1:]...)
nd.x.Stdin, nd.x.Stdout, nd.x.Stderr = nd.Stdin, nd.Stdout, nd.Stderr
nd.x.ExtraFiles = append(nd.x.ExtraFiles, nd.extrafds...)
err = nd.x.Start()
if err != nil {
dbg.Warn("%s: %s", name, err)
xprintf("x %s done\n", nd)
nd.closeAll()
nd.waitc <- err
return err
}
go func() {
xprintf("x %s done\n", nd)
errc := make(chan error, 1)
go func() {
errc <- nd.x.Wait()
}()
var err error
Loop:
for {
select {
case err = <-errc:
break Loop
case <-nd.intrc:
err = errors.New("interrupted")
proc := nd.x.Process
if proc != nil {
proc.Signal(os.Interrupt)
} else {
break Loop
}
}
}
nd.closeAll()
nd.waitc <- err
}()
return nil
}
