Restore reading backspace if typing with autoread disabled.

AGENTS.md

@@ -0,0 +1,55 @@
+# Repository Guidelines
+
+## Project Structure & Module Organization
+
+Fenrir is a Linux console screen reader with an X11 terminal mode. This checkout
+is on the Go migration's `testing` branch; confirm the intended branch before
+contributing. `cmd/fenrir/` contains the executable entry point. `internal/`
+contains packages for input, screen review, speech, sound, configuration, and
+remote control. Go tests live beside their packages as `*_test.go`.
+
+`config/` holds TOML settings, keyboard layouts, punctuation profiles, and sound
+assets. `internal/i18n/locale/` holds translations. `docs/` contains manuals;
+`tools/` contains maintenance utilities. `src/fenrirscreenreader/` retains Python
+sources, while `tests/` includes Python unit, integration, and native fixtures.
+
+## Build, Test, and Development Commands
+
+Use Linux, Go 1.27.2 or newer, a C compiler, and `pkg-config`, with development
+libraries for libevdev, X11, libvterm, and ALSA. See `README.md` for runtime dependencies.
+
+- `go build -o fenrir ./cmd/fenrir`: build the executable beside its resources.
+- `./fenrir --config config/settings/settings.toml --check-config`: validate settings without opening devices.
+- `./fenrir -x`: run in an X11 terminal with `DISPLAY` and `WINDOWID` available.
+- `go test ./...`: run the Go test suite.
+- `go test ./internal/reader`: run a focused package's tests.
+- `go run ./tools/translations check`: validate extracted messages and catalogs; requires GNU gettext.
+
+## Coding Style & Naming Conventions
+
+Format Go changes with `gofmt` and preserve tab indentation. Follow neighboring
+code: camelCase locals, snake_case helpers, and capitalized exported identifiers
+where required by Go visibility. Preserve existing license headers. Keep changes
+focused and use existing configuration and presentation APIs.
+
+Keep interface messages translatable through `internal/i18n`; exclude screen
+contents and protocol identifiers. After message changes, run
+`go run ./tools/translations update`, review catalog changes, then run `check`.
+Run `shellcheck` on edited shell scripts.
+
+## Testing Guidelines
+
+Use Go's `testing` package with `Test...` functions in `*_test.go`. Cover changed
+behavior and plausible regressions; no numeric coverage threshold is documented.
+Follow each native fixture's prerequisites. Automated checks do not establish
+audible speech or physical keyboard behavior: verify affected console or X11
+workflows, including navigation and settings persistence. Preserve the active reader.
+
+## Commit & Pull Request Guidelines
+
+History uses short descriptive subjects, without a consistent prefix convention.
+Keep commits scoped. Describe the problem, resulting behavior, linked issues when
+applicable, commands run, and pending live checks. Follow the README's
+AI-assisted contribution policy: contributors must review the diff and test
+intended behavior and likely regressions before submission. Leave submission to
+the contributor after review.

internal/app/deletion_test.go

@@ -0,0 +1,89 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package app
+
+import (
+	"context"
+	"reflect"
+	"testing"
+	"time"
+
+	"git.stormux.org/storm/fenrir/internal/command"
+	"git.stormux.org/storm/fenrir/internal/config"
+	"git.stormux.org/storm/fenrir/internal/input"
+	"git.stormux.org/storm/fenrir/internal/screen"
+)
+
+func TestDeletionThroughSharedRouterWithAutoreadOff(t *testing.T) {
+	for _, key := range []uint16{input.KeyBackspace, input.KeyDelete} {
+		for _, mode := range []string{"enabled", "muted", "temporary silence", "speech disabled"} {
+			t.Run(mode+"/"+map[uint16]string{input.KeyBackspace: "backspace", input.KeyDelete: "delete"}[key], func(t *testing.T) {
+				router, err := input.New_router([]input.Binding{{Name: "Quit", Keys: []string{"FENRIR", "Q"}, Command: command.Quit}})
+				if err != nil {
+					t.Fatal(err)
+				}
+				beforeX := 11
+				if key == input.KeyDelete {
+					beforeX = 10
+				}
+				source := &fakeSource{snapshot: screen.Snapshot{Terminal: 1, Active: true, Rows: 2, Cols: 20, X: beforeX, Cells: []rune("type 2% abc         " + "Download 20%        ")}, events: make(chan error, 1)}
+				keys := &fakeKeys{events: make(chan error, 1)}
+				voice, sounds := &fakeVoice{}, &fakeSounds{}
+				voice.muted = mode == "speech disabled"
+				reads, polls := 0, 0
+				source.afterRead = func() {
+					reads++
+					if reads == 2 {
+						keys.events <- nil
+					}
+				}
+				keys.poll = func(_ bool, handle func(input.Decision)) error {
+					polls++
+					if polls == 1 {
+						handle(input.Decision{Command: command.AutoRead, Interrupt: true})
+						if mode == "muted" {
+							handle(input.Decision{Command: command.Mute, Interrupt: true})
+						}
+						handle(router.Key(0, key, 1, false, false))
+						if mode == "temporary silence" {
+							handle(input.Decision{Command: command.TempDisableSpeech, Interrupt: true})
+						}
+						voice.messages = nil
+						source.snapshot.Cells = []rune("type 2% ab          " + "Download 30%        ")
+						source.snapshot.X = 10
+						source.events <- nil
+					} else {
+						handle(input.Decision{Command: command.Quit})
+					}
+					return nil
+				}
+				settings := config.Defaults()
+				settings.Keyboard.CharacterEcho = false
+				settings.Keyboard.WordEcho = false
+				settings.Reading.CursorEcho = false
+				settings.Presentation.Progress.Enabled = true
+				settings.Presentation.Speech.Enabled = mode != "speech disabled"
+				ctx, cancel := context.WithTimeout(context.Background(), time.Second)
+				defer cancel()
+				if err := run(ctx, source, keys, voice, nil, RunOptions{Settings: settings, Sounds: sounds}); err != nil || reads != 2 {
+					t.Fatal(err, reads)
+				}
+				var want []string
+				if mode == "enabled" {
+					want = []string{"c"}
+				}
+				if !reflect.DeepEqual(voice.messages, want) {
+					t.Fatal("deletion speech or concurrent output", voice.messages, want)
+				}
+				wantProgress := []float64{30}
+				if mode == "temporary silence" {
+					wantProgress = nil
+				}
+				if !reflect.DeepEqual(sounds.progress, wantProgress) {
+					t.Fatal("concurrent background progress lost or deletion beeped", sounds.progress)
+				}
+			})
+		}
+	}
+}

internal/reader/deletion_test.go

@@ -0,0 +1,115 @@
+// Copyright (c) 2026 Storm Dragon
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package reader
+
+import (
+	"reflect"
+	"testing"
+	"time"
+
+	"git.stormux.org/storm/fenrir/internal/command"
+	"git.stormux.org/storm/fenrir/internal/presentation"
+	"git.stormux.org/storm/fenrir/internal/screen"
+)
+
+func TestDeletionEchoWithAutomaticReadingDisabled(t *testing.T) {
+	for _, trial := range []struct {
+		name, before, after string
+		beforeX, afterX     int
+		want                []presentation.Message
+	}{
+		{"backspace", "$ abc", "$ ab", 5, 4, []presentation.Message{presentation.Character_message('c')}},
+		{"delete", "$ abc", "$ ac", 3, 3, []presentation.Message{presentation.Character_message('b')}},
+		{"midline backspace", "$ abc", "$ ac", 4, 3, []presentation.Message{presentation.Character_message('b')}},
+		{"unicode", "$ café", "$ caf", 6, 5, []presentation.Message{presentation.Character_message('é')}},
+		{"punctuation", "$ .", "$ ", 3, 2, []presentation.Message{presentation.Character_message('.')}},
+		{"space", "$ ab ", "$ ab", 5, 4, []presentation.Message{presentation.Character_message(' ')}},
+		{"word", "$ one two", "$ one ", 9, 6, []presentation.Message{{Text: "two"}}},
+		{"forward word", "$ one two", "$ two", 2, 2, []presentation.Message{{Text: "one "}}},
+	} {
+		t.Run(trial.name, func(t *testing.T) {
+			r := New()
+			r.Configure(false, false)
+			r.Configure_echo(false, false, false)
+			before := fixture(trial.before, "background")
+			before.X = trial.beforeX
+			r.Update(before)
+			r.Command(command.CurrentLine)
+			r.Note_input(true, false, false)
+			r.Note_deletion()
+			// An unchanged capture and background output can precede the edit.
+			r.Update(before)
+			background := fixture(trial.before, "changed background")
+			background.X = trial.beforeX
+			if got := r.Update(background); len(got) != 0 {
+				t.Fatal("background output escaped autoread", got)
+			}
+			after := fixture(trial.after, "more background")
+			after.X = trial.afterX
+			if got := r.Update(after); !reflect.DeepEqual(got, trial.want) {
+				t.Fatal("deletion echo", got, trial.want)
+			}
+			if got := r.Update(before); len(got) != 0 {
+				t.Fatal("redraw spoke after deletion", got)
+			}
+			if got := r.Update(after); len(got) != 0 {
+				t.Fatal("deletion authorization was reused", got)
+			}
+		})
+	}
+}
+
+func TestDeletionEchoRejectsUnconfirmedChanges(t *testing.T) {
+	for _, mode := range []string{"no key", "expired", "other key", "reader command", "redraw", "cursor only", "no echo", "new terminal", "new buffer", "resize", "inactive", "live region"} {
+		t.Run(mode, func(t *testing.T) {
+			r := New()
+			r.Configure(false, true)
+			before, after := fixture("$ abc", "background"), fixture("$ ab", "changed background")
+			before.X, after.X = 5, 4
+			r.Update(before)
+			if mode != "no key" {
+				r.Note_input(true, false, false)
+				r.Note_deletion()
+			}
+			switch mode {
+			case "expired":
+				r.progressDeletionAt = time.Now().Add(-time.Second)
+			case "other key":
+				r.Note_input(true, false, false)
+			case "reader command":
+				r.Command(command.CurrentLine)
+			case "redraw":
+				after = fixture("$ xx", "changed background")
+				after.X = 4
+			case "cursor only":
+				after = before
+				after.X = 4
+			case "no echo":
+				after = before
+			case "new terminal":
+				after.Terminal++
+			case "new buffer":
+				after.Generation++
+			case "resize":
+				after = fixture("$ ab")
+				after.X = 4
+			case "inactive":
+				after.Active = false
+			case "live region":
+				r.ensure_regions().live[0] = &screen.Region{Right: before.Cols - 1}
+			}
+			if got := r.Update(after); len(got) != 0 {
+				t.Fatal("unconfirmed or excluded deletion spoke", got)
+			}
+			if mode == "new terminal" || mode == "new buffer" || mode == "resize" || mode == "inactive" {
+				if got := r.Update(before); len(got) != 0 {
+					t.Fatal("old session spoke", got)
+				}
+				if got := r.Update(fixture("$ ab", "background")); len(got) != 0 {
+					t.Fatal("pending deletion survived session change", got)
+				}
+			}
+		})
+	}
+}

internal/reader/echo.go

@@ -138,3 +138,22 @@ func all_spaces(cells []rune) bool {
 	}
 	return true
 }
+
+// Deletion echo uses only text verified against the previous screen. Like
+// typing echo, it remains available with autoread/cursor/character echo off,
+// but never exposes text excluded by a live region.
+func (r *Reader) deletion_echo(deleted []rune, next screen.Snapshot) []presentation.Message {
+	var allowed []rune
+	for index, char := range deleted {
+		if r.region_state().allows(next.X+index, next.Y, next.Cols, false, true) {
+			allowed = append(allowed, char)
+		}
+	}
+	if len(allowed) == 1 {
+		return []presentation.Message{presentation.Character_message(allowed[0])}
+	}
+	if len(allowed) > 1 {
+		return []presentation.Message{{Text: string(allowed)}}
+	}
+	return nil
+}

internal/reader/progress.go

@@ -41,10 +41,11 @@ func (r *Reader) Note_deletion() { r.progressDeletionAt = time.Now() }
 
 // A recent deletion key alone is insufficient: match the actual cursor-row
 // deletion so background progress, including another row in the same snapshot,
-// remains available to the detector. Automatic deletion speech is unchanged.
-func (r *Reader) progress_deletion_row(previous, next screen.Snapshot) int {
+// remains available to the detector. The same evidence permits deletion echo
+// while automatic reading is disabled, without speaking other screen changes.
+func (r *Reader) match_deletion(previous, next screen.Snapshot) []rune {
 	if r.progressDeletionAt.IsZero() || time.Since(r.progressDeletionAt) > echoWindow || previous.Y != next.Y || next.X > previous.X {
-		return -1
+		return nil
 	}
 	before, after := previous.Line(next.Y), next.Line(next.Y)
 	count := previous.X - next.X
@@ -61,8 +62,8 @@ func (r *Reader) progress_deletion_row(previous, next screen.Snapshot) int {
 	}
 	if count <= 0 || next.X+count > next.Cols || !slices.Equal(before[:next.X], after[:next.X]) ||
 		!slices.Equal(before[next.X+count:], after[next.X:next.Cols-count]) || !all_spaces(after[next.Cols-count:]) {
-		return -1
+		return nil
 	}
 	r.progressDeletionAt = time.Time{}
-	return next.Y
+	return before[next.X : next.X+count]
 }

internal/reader/reader.go

@@ -149,11 +149,20 @@ func (r *Reader) Update(next screen.Snapshot) (output []presentation.Message) {
 		path = "typing-echo"
 		return echo
 	}
+	deleted := r.match_deletion(previous, next)
 	if r.progressEnabled {
-		r.progress.Update(regions.progress_snapshot(previous), regions.progress_snapshot(next), r.progress_deletion_row(previous, next))
+		deletionRow := -1
+		if len(deleted) > 0 {
+			deletionRow = next.Y
+		}
+		r.progress.Update(regions.progress_snapshot(previous), regions.progress_snapshot(next), deletionRow)
 	}
 	if !r.automatic {
 		path = "automatic-disabled"
+		if len(deleted) > 0 {
+			path = "deletion-echo"
+			return r.deletion_echo(deleted, next)
+		}
 		return nil
 	}
 	readingPrevious := regions.filtered_snapshot(previous, true, true)
@@ -171,6 +180,7 @@ func (r *Reader) Update(next screen.Snapshot) (output []presentation.Message) {
 // presentation state for callers to retrieve after dispatch.
 func (r *Reader) Command(id command.ID) presentation.CommandResult {
 	r.applicationInputAt = time.Time{}
+	r.progressDeletionAt = time.Time{}
 	if result, handled := r.region_command(id); handled {
 		return result
 	}