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interact.go
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interact.go
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package shell
import (
"fmt"
"io"
"os"
"path/filepath"
"strings"
"syscall"
"time"
"src.elv.sh/pkg/cli"
"src.elv.sh/pkg/cli/term"
"src.elv.sh/pkg/diag"
"src.elv.sh/pkg/edit"
"src.elv.sh/pkg/eval"
"src.elv.sh/pkg/parse"
"src.elv.sh/pkg/sys"
)
// InteractiveRescueShell determines whether a panic results in a rescue shell
// being launched. It should be set to false by interactive mode unit tests.
var interactiveRescueShell bool = true
// InteractConfig keeps configuration for the interactive mode.
type InteractConfig struct {
SpawnDaemon bool
Paths Paths
}
// Interactive mode panic handler.
func handlePanic() {
r := recover()
if r != nil {
println()
print(sys.DumpStack())
println()
fmt.Println(r)
println("\nExecing recovery shell /bin/sh")
syscall.Exec("/bin/sh", []string{"/bin/sh"}, os.Environ())
}
}
// Interact runs an interactive shell session.
func Interact(fds [3]*os.File, cfg *InteractConfig) {
if interactiveRescueShell {
defer handlePanic()
}
ev, cleanup := setupShell(fds, cfg.Paths, cfg.SpawnDaemon)
defer cleanup()
// Build Editor.
var ed editor
if sys.IsATTY(fds[0]) {
newed := edit.NewEditor(cli.NewTTY(fds[0], fds[2]), ev, ev.DaemonClient())
ev.AddBuiltin(eval.NsBuilder{}.AddNs("edit", newed.Ns()).Ns())
ed = newed
} else {
ed = newMinEditor(fds[0], fds[2])
}
// Source rc.elv.
if cfg.Paths.Rc != "" {
err := sourceRC(fds, ev, ed, cfg.Paths.Rc)
if err != nil {
diag.ShowError(fds[2], err)
}
}
term.Sanitize(fds[0], fds[2])
cooldown := time.Second
cmdNum := 0
for {
cmdNum++
line, err := ed.ReadCode()
if err == io.EOF {
break
} else if err != nil {
fmt.Fprintln(fds[2], "Editor error:", err)
if _, isMinEditor := ed.(*minEditor); !isMinEditor {
fmt.Fprintln(fds[2], "Falling back to basic line editor")
ed = newMinEditor(fds[0], fds[2])
} else {
fmt.Fprintln(fds[2], "Don't know what to do, pid is", os.Getpid())
fmt.Fprintln(fds[2], "Restarting editor in", cooldown)
time.Sleep(cooldown)
if cooldown < time.Minute {
cooldown *= 2
}
}
continue
}
// No error; reset cooldown.
cooldown = time.Second
// Execute the command line only if it is not entirely whitespace. This keeps side-effects,
// such as executing `$edit:after-command` hooks, from occurring when we didn't actually
// evaluate any code entered by the user.
if strings.TrimSpace(line) == "" {
continue
}
src := parse.Source{Name: fmt.Sprintf("[tty %v]", cmdNum), Code: line}
duration, err := evalInTTY(ev, fds, src)
ed.RunAfterCommandHooks(src, duration, err)
term.Sanitize(fds[0], fds[2])
if err != nil {
diag.ShowError(fds[2], err)
}
}
}
func sourceRC(fds [3]*os.File, ev *eval.Evaler, ed eval.Editor, rcPath string) error {
absPath, err := filepath.Abs(rcPath)
if err != nil {
return fmt.Errorf("cannot get full path of rc.elv: %v", err)
}
code, err := readFileUTF8(absPath)
if err != nil {
if os.IsNotExist(err) {
return nil
}
return err
}
src := parse.Source{Name: absPath, Code: code, IsFile: true}
duration, err := evalInTTY(ev, fds, src)
ed.RunAfterCommandHooks(src, duration, err)
return err
}