Initial support for application specific overrides.

internal/prompt/shell.go

@@ -0,0 +1,37 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package prompt
+
+import (
+	"regexp"
+	"strings"
+
+	"git.stormux.org/storm/fenrir/internal/screen"
+)
+
+// Unlike Detector, ShellDetector excludes passwords, questions and completion
+// messages. It observes raw screens, independently of application speech filters.
+type ShellDetector struct {
+	previous map[string]int
+	terminal int
+}
+
+var shellPattern = regexp.MustCompile(`^(?:[$#>]|\[[^\r\n]+\]\s*[$#>]|[a-zA-Z0-9._-]+[$#>]|[a-zA-Z0-9._-]+@[^\s<>]+.*[$#>])\s*$`)
+
+func (d *ShellDetector) Observe(next screen.Snapshot) bool {
+	if !next.Active || next.Rows <= 0 || next.Cols <= 0 || len(next.Cells) != next.Rows*next.Cols {
+		return false
+	}
+	counts := make(map[string]int)
+	for row := range next.Rows {
+		counts[strings.TrimSpace(next.Text(row))]++
+	}
+	text := ""
+	if next.Y >= 0 && next.Y < next.Rows {
+		text = strings.TrimSpace(next.Text(next.Y))
+	}
+	fresh := d.previous != nil && d.terminal == next.Terminal && shellPattern.MatchString(text) && counts[text] > d.previous[text]
+	d.previous, d.terminal = counts, next.Terminal
+	return fresh
+}

internal/prompt/shell_test.go

@@ -0,0 +1,46 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package prompt
+
+import (
+	"git.stormux.org/storm/fenrir/internal/screen"
+	"testing"
+)
+
+func TestShellDetectorRequiresFreshCursorPrompt(t *testing.T) {
+	makeScreen := func(text string, cursor int) screen.Snapshot {
+		s := screen.Snapshot{Terminal: 1, Active: true, Rows: 3, Cols: 80, Y: cursor, Cells: make([]rune, 240)}
+		for i := range s.Cells {
+			s.Cells[i] = ' '
+		}
+		copy(s.Line(1), []rune(text))
+		return s
+	}
+	for _, text := range []string{"[Username@host directory] $", "Username@host:~$", "$", "#"} {
+		var detector ShellDetector
+		detector.Observe(makeScreen("application", 1))
+		s := makeScreen(text, 1)
+		s.Generation = 1
+		if !detector.Observe(s) {
+			t.Fatal("new shell prompt missed", text)
+		}
+		if detector.Observe(s) {
+			t.Fatal("unchanged prompt repeated", text)
+		}
+	}
+	for _, text := range []string{"Password:", "Confirm? [y/n]", "<Username> $", "<Username@host> $", "press any key to continue", "Worked for 2s • 1:00 PM"} {
+		var detector ShellDetector
+		detector.Observe(makeScreen("application", 1))
+		if detector.Observe(makeScreen(text, 1)) {
+			t.Fatal("non-shell prompt", text)
+		}
+	}
+	var detector ShellDetector
+	s := makeScreen("$", 0)
+	detector.Observe(s)
+	s.Y = 1
+	if detector.Observe(s) {
+		t.Fatal("old prompt became fresh after cursor motion")
+	}
+}