fixed #5862 - configurable Backspace behaviour

tabby-terminal/src/components/inputProcessingSettings.component.pug

@@ -0,0 +1,9 @@
+.form-line
+    .header
+        .title(translate) Backspace key mode
+
+    select.form-control([(ngModel)]='options.backspace')
+        option(
+            *ngFor='let mode of backspaceModes',
+            [value]='mode.key',
+        ) {{mode.name|translate}}

tabby-terminal/src/components/inputProcessingSettings.component.ts

@@ -0,0 +1,40 @@
+/* eslint-disable @typescript-eslint/explicit-module-boundary-types */
+import { marker as _ } from '@biesbjerg/ngx-translate-extract-marker'
+import { Component, Input } from '@angular/core'
+import { InputProcessingOptions } from '../middleware/inputProcessing'
+
+/** @hidden */
+@Component({
+    selector: 'input-processing-settings',
+    templateUrl: './inputProcessingSettings.component.pug',
+})
+export class InputProcessingSettingsComponent {
+    @Input() options: InputProcessingOptions
+
+    backspaceModes = [
+        {
+            key: 'backspace',
+            name: _('Pass-through'),
+        },
+        {
+            key: 'ctrl-h',
+            name: 'Ctrl-H',
+        },
+        {
+            key: 'ctrl-?',
+            name: 'Ctrl-?',
+        },
+        {
+            key: 'delete',
+            name: 'Delete (CSI 3~)',
+        },
+    ]
+
+    getBackspaceModeName (key) {
+        return this.backspaceModes.find(x => x.key === key)?.name
+    }
+
+    setBackspaceMode (mode) {
+        this.options.backspace = mode
+    }
+}

tabby-terminal/src/index.ts

@@ -18,6 +18,7 @@ import { StreamProcessingSettingsComponent } from './components/streamProcessing
 import { LoginScriptsSettingsComponent } from './components/loginScriptsSettings.component'
 import { TerminalToolbarComponent } from './components/terminalToolbar.component'
 import { ColorSchemeSelectorComponent } from './components/colorSchemeSelector.component'
+import { InputProcessingSettingsComponent } from './components/inputProcessingSettings.component'
 
 import { TerminalDecorator } from './api/decorator'
 import { TerminalContextMenuItemProvider } from './api/contextMenuProvider'
@@ -76,6 +77,7 @@ import { DefaultColorSchemes } from './colorSchemes'
         StreamProcessingSettingsComponent,
         LoginScriptsSettingsComponent,
         TerminalToolbarComponent,
+        InputProcessingSettingsComponent,
     ],
     exports: [
         ColorPickerComponent,
@@ -84,6 +86,7 @@ import { DefaultColorSchemes } from './colorSchemes'
         StreamProcessingSettingsComponent,
         LoginScriptsSettingsComponent,
         TerminalToolbarComponent,
+        InputProcessingSettingsComponent,
     ],
 })
 export default class TerminalModule { } // eslint-disable-line @typescript-eslint/no-extraneous-class
@@ -97,6 +100,7 @@ export * from './middleware/streamProcessing'
 export * from './middleware/loginScriptProcessing'
 export * from './middleware/oscProcessing'
 export * from './middleware/utf8Splitter'
+export * from './middleware/inputProcessing'
 export * from './api/middleware'
 export * from './session'
 export { LoginScriptsSettingsComponent, StreamProcessingSettingsComponent }

tabby-terminal/src/middleware/inputProcessing.ts

@@ -0,0 +1,28 @@
+import { SessionMiddleware } from '../api/middleware'
+
+export interface InputProcessingOptions {
+    backspace: 'ctrl-h'|'ctrl-?'|'delete'|'backspace'
+}
+
+export class InputProcessor extends SessionMiddleware {
+    constructor (
+        private options: InputProcessingOptions,
+    ) {
+        super()
+    }
+
+    feedFromTerminal (data: Buffer): void {
+        if (data.length === 1 && data[0] === 0x7f) {
+            if (this.options.backspace === 'ctrl-h') {
+                data = Buffer.from('\x08')
+            } else if (this.options.backspace === 'ctrl-?') {
+                data = Buffer.from('\x7f')
+            } else if (this.options.backspace === 'delete') {
+                data = Buffer.from('\x1b[3~')
+            } else {
+                data = Buffer.from('\x7f')
+            }
+        }
+        this.outputToSession.next(data)
+    }
+}

tabby-terminal/src/middleware/loginScriptProcessing.ts

@@ -73,11 +73,6 @@ export class LoginScriptProcessor extends SessionMiddleware {
         super.feedFromSession(data)
     }
 
-    close (): void {
-        this.outputToSession.complete()
-        super.close()
-    }
-
     executeUnconditionalScripts (): void {
         for (const script of this.remainingScripts) {
             if (!script.expect) {