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
+}