Add clear command

internal/server/commands/clear.go

@@ -0,0 +1,45 @@
+package commands
+
+import (
+	"io"
+
+	"github.com/NHAS/reverse_ssh/internal/server/users"
+	"github.com/NHAS/reverse_ssh/internal/terminal"
+)
+
+type clear struct {
+}
+
+func (e *clear) ValidArgs() map[string]string {
+	return map[string]string{}
+}
+
+func (e *clear) Run(user *users.User, tty io.ReadWriter, line terminal.ParsedLine) error {
+
+	term, ok := tty.(*terminal.Terminal)
+	if !ok {
+		return nil
+	}
+
+	term.Clear()
+
+	return nil
+}
+
+func (e *clear) Expect(line terminal.ParsedLine) []string {
+	return nil
+}
+
+func (e *clear) Help(explain bool) string {
+
+	const description = "Clear server console"
+
+	if explain {
+		return description
+	}
+
+	return terminal.MakeHelpText(e.ValidArgs(),
+		"clear",
+		description,
+	)
+}

internal/server/commands/init.go

@@ -25,6 +25,7 @@ var allCommands = map[string]terminal.Command{
 	"access":       &access{},
 	"autocomplete": &shellAutocomplete{},
 	"log":          &logCommand{},
+	"clear":        &clear{},
 }
 
 func CreateCommands(session string, user *users.User, log logger.Logger, datadir string) map[string]terminal.Command {
@@ -46,6 +47,7 @@ func CreateCommands(session string, user *users.User, log logger.Logger, datadir
 		"access":       &access{},
 		"autocomplete": &shellAutocomplete{},
 		"log":          Log(log),
+		"clear":        &clear{},
 	}
 
 	return o

internal/terminal/terminal.go

@@ -951,6 +951,19 @@ func (t *Terminal) handleKey(key rune) (line string, ok bool) {
 	return
 }
 
+func (t *Terminal) Clear() {
+
+	t.lock.Lock()
+	defer t.lock.Unlock()
+
+	// Erases the screen and moves the cursor to the home position.
+	t.queue([]rune("\x1b[2J\x1b[H"))
+	t.queue(t.prompt)
+	t.cursorX, t.cursorY = 0, 0
+	t.advanceCursor(visualLength(t.prompt))
+	t.setLine(t.line, t.pos)
+}
+
 // addKeyToLine inserts the given key at the current position in the current
 // line.
 func (t *Terminal) addKeyToLine(key rune) {