readline input mode for serial terminals - #3099, #2661

app/src/global.scss

@@ -95,3 +95,7 @@ input[type=range] {
     &::-moz-range-track { @include track(); }
     &::-ms-track { @include track(); }
 }
+
+a[ngbdropdownitem] {
+    cursor: pointer;
+}

terminus-serial/src/api.ts

@@ -2,7 +2,10 @@ import stripAnsi from 'strip-ansi'
 import { BaseSession } from 'terminus-terminal'
 import { SerialPort } from 'serialport'
 import { Logger } from 'terminus-core'
-import { Subject, Observable } from 'rxjs'
+import { Subject, Observable, interval } from 'rxjs'
+import { debounce } from 'rxjs/operators'
+import { ReadLine, createInterface as createReadline, clearLine } from 'readline'
+import { PassThrough, Readable, Writable } from 'stream'
 
 export interface LoginScript {
     expect: string
@@ -24,6 +27,7 @@ export interface SerialConnection {
     xany: boolean
     scripts?: LoginScript[]
     color?: string
+    inputMode?: InputMode
 }
 
 export const BAUD_RATES = [
@@ -35,6 +39,8 @@ export interface SerialPortInfo {
     description?: string
 }
 
+export type InputMode = null | 'readline'
+
 export class SerialSession extends BaseSession {
     scripts?: LoginScript[]
     serial: SerialPort
@@ -42,17 +48,38 @@ export class SerialSession extends BaseSession {
 
     get serviceMessage$ (): Observable<string> { return this.serviceMessage }
     private serviceMessage = new Subject<string>()
+    private inputReadline: ReadLine
+    private inputPromptVisible = true
+    private inputReadlineInStream: Readable & Writable
+    private inputReadlineOutStream: Readable & Writable
 
     constructor (public connection: SerialConnection) {
         super()
         this.scripts = connection.scripts ?? []
+
+        this.inputReadlineInStream = new PassThrough()
+        this.inputReadlineOutStream = new PassThrough()
+        this.inputReadline = createReadline({
+            input: this.inputReadlineInStream,
+            output: this.inputReadlineOutStream,
+            terminal: true,
+        } as any)
+        this.inputReadlineOutStream.on('data', data => {
+            if (this.connection.inputMode == 'readline') {
+                this.emitOutput(data)
+            }
+        })
+        this.inputReadline.on('line', line => {
+            this.onInput(new Buffer(line + '\n'))
+        })
+        this.output$.pipe(debounce(() => interval(500))).subscribe(() => this.onOutputSettled())
     }
 
     async start (): Promise<void> {
         this.open = true
 
         this.serial.on('readable', () => {
-            this.onData(this.serial.read())
+            this.onOutput(this.serial.read())
         })
 
         this.serial.on('end', () => {
@@ -66,18 +93,23 @@ export class SerialSession extends BaseSession {
     }
 
     write (data: Buffer): void {
-        if (this.serial) {
-            this.serial.write(data.toString())
+        if (this.connection.inputMode == 'readline') {
+            this.inputReadlineInStream.write(data)
+        } else {
+            this.onInput(data)
         }
     }
 
     async destroy (): Promise<void> {
         this.serviceMessage.complete()
+        this.inputReadline.close()
         await super.destroy()
     }
 
     // eslint-disable-next-line @typescript-eslint/no-empty-function, @typescript-eslint/explicit-module-boundary-types, @typescript-eslint/no-empty-function
-    resize (_, __) { }
+    resize (_, __) {
+        this.inputReadlineOutStream.emit('resize')
+    }
 
     kill (_?: string): void {
         this.serial.close()
@@ -104,8 +136,33 @@ export class SerialSession extends BaseSession {
         return null
     }
 
-    private onData (data: Buffer) {
+    private onInput (data: Buffer) {
+        if (this.serial) {
+            this.serial.write(data.toString())
+        }
+    }
+
+    private onOutputSettled () {
+        if (this.connection.inputMode == 'readline' && !this.inputPromptVisible) {
+            this.resetInputPrompt()
+        }
+    }
+
+    private resetInputPrompt () {
+        this.emitOutput(new Buffer('\r\n'))
+        this.inputReadline.prompt(true)
+        this.inputPromptVisible = true
+    }
+
+    private onOutput (data: Buffer) {
         const dataString = data.toString()
+
+        if (this.connection.inputMode == 'readline') {
+            if (this.inputPromptVisible) {
+                clearLine(this.inputReadlineOutStream, 0)
+                this.inputPromptVisible = false
+            }
+        }
         this.emitOutput(data)
 
         if (this.scripts) {

terminus-serial/src/components/editConnectionModal.component.pug

@@ -11,6 +11,8 @@
                         [(ngModel)]='connection.name',
                     )
 
+                .row
+                    .col-6
                         .form-group
                             label Path
                             input.form-control(
@@ -20,6 +22,7 @@
                                 [resultFormatter]='portsFormatter',
                             )
 
+                    .col-6
                         .form-group
                             label Baud Rate
                             select.form-control(
@@ -27,6 +30,25 @@
                             )
                                 option([value]='x', *ngFor='let x of baudRates') {{x}}
 
+                .form-line
+                    .header
+                        .title Input mode
+
+                    .d-flex(ngbDropdown)
+                        button.btn.btn-secondary.btn-tab-bar(
+                            ngbDropdownToggle,
+                        ) {{getInputModeName(connection.inputMode)}}
+
+                        div(ngbDropdownMenu)
+                            a.d-flex.flex-column(
+                                *ngFor='let mode of inputModes',
+                                (click)='connection.inputMode = mode.key',
+                                ngbDropdownItem
+                            )
+                                div {{mode.name}}
+                                .text-muted {{mode.description}}
+
+
         ngb-tab(id='advanced')
             ng-template(ngbTabTitle) Advanced
             ng-template(ngbTabContent)

terminus-serial/src/components/editConnectionModal.component.ts

@@ -15,6 +15,10 @@ export class EditConnectionModalComponent {
     connection: SerialConnection
     foundPorts: SerialPortInfo[]
     baudRates = BAUD_RATES
+    inputModes = [
+        { key: null, name: 'Normal', description: 'Input is sent as you type' },
+        { key: 'readline', name: 'Line by line', description: 'Line editor, input is sent after you press Enter' },
+    ]
 
     constructor (
         private modalInstance: NgbActiveModal,
@@ -24,6 +28,10 @@ export class EditConnectionModalComponent {
     ) {
     }
 
+    getInputModeName (key) {
+        return this.inputModes.find(x => x.key === key)?.name
+    }
+
     portsAutocomplete = text$ => text$.pipe(map(() => {
         return this.foundPorts.map(x => x.name)
     }))

terminus-serial/src/components/serialSettingsTab.component.ts

@@ -34,6 +34,7 @@ export class SerialSettingsTabComponent {
             xany: false,
             xoff: false,
             xon: false,
+            inputMode: null
         }
 
         const modal = this.ngbModal.open(EditConnectionModalComponent)

terminus-serial/src/services/serial.service.ts

@@ -114,7 +114,7 @@ export class SerialService {
         options.push({
             name: 'Manage connections',
             icon: 'cog',
-            callback: () => this.app.openNewTab(SettingsTabComponent, { activeTab: 'serial' }),
+            callback: () => this.app.openNewTabRaw(SettingsTabComponent, { activeTab: 'serial' }),
         })
 
         options.push({

terminus-serial/webpack.config.js

@@ -50,6 +50,8 @@ module.exports = {
         'path',
         'ngx-toastr',
         'serialport',
+        'readline',
+        'stream',
         'windows-process-tree/build/Release/windows_process_tree.node',
         /^rxjs/,
         /^@angular/,

terminus-ssh/src/services/ssh.service.ts

@@ -383,7 +383,7 @@ export class SSHService {
         options.push({
             name: 'Manage connections',
             icon: 'cog',
-            callback: () => this.app.openNewTab(SettingsTabComponent, { activeTab: 'ssh' }),
+            callback: () => this.app.openNewTabRaw(SettingsTabComponent, { activeTab: 'ssh' }),
         })
 
         options.push({