.

app/src/link-highlighter/decorator.ts

@@ -7,8 +7,6 @@ import { Inject, Injectable } from '@angular/core'
 import { LinkHandler } from './api'
 import { TerminalDecorator, TerminalTabComponent } from '../terminal/api'
 
-const debounceDelay = 500
-
 
 @Injectable()
 export class LinkHighlighterDecorator extends TerminalDecorator {
@@ -17,40 +15,11 @@ export class LinkHighlighterDecorator extends TerminalDecorator {
     }
 
     attach (terminal: TerminalTabComponent): void {
-        const Screen = terminal.hterm.screen_.constructor
-        if (Screen._linkHighlighterInstalled) {
-            return
-        }
-        Screen._linkHighlighterInstalled = true
-
-        const oldInsertString = Screen.prototype.insertString
-        const oldDeleteChars = Screen.prototype.deleteChars
-        let self = this
-        Screen.prototype.insertString = function (content) {
-            let ret = oldInsertString.bind(this)(content)
-            self.debounceInsertLinks(this)
-            return ret
-        }
-        Screen.prototype.deleteChars = function (count) {
-            let ret = oldDeleteChars.bind(this)(count)
-            self.debounceInsertLinks(this)
-            return ret
-        }
-    }
-
-    debounceInsertLinks (screen) {
-        if (screen.__insertLinksTimeout) {
-            screen.__insertLinksRebounce = true
-        } else {
-            screen.__insertLinksTimeout = window.setTimeout(() => {
-                this.insertLinks(screen)
-                screen.__insertLinksTimeout = null
-                if (screen.__insertLinksRebounce) {
-                    screen.__insertLinksRebounce = false
-                    this.debounceInsertLinks(screen)
-                }
-            }, debounceDelay)
-        }
+        terminal.contentUpdated$
+            .debounceTime(1000)
+            .subscribe(() => {
+                this.insertLinks(terminal.hterm.screen_)
+            })
     }
 
     insertLinks (screen) {

app/src/terminal/components/terminalTab.ts

@@ -19,12 +19,14 @@ export class TerminalTabComponent extends BaseTabComponent<TerminalTab> {
     hterm: any
     configSubscription: Subscription
     focusedSubscription: Subscription
-    startupTime: number
     title$ = new BehaviorSubject('')
     size$ = new ReplaySubject<ResizeEvent>(1)
     input$ = new Subject<string>()
     output$ = new Subject<string>()
     contentUpdated$ = new Subject<void>()
+    alternateScreenActive$ = new BehaviorSubject(false)
+    mouseEvent$ = new Subject<Event>()
+    private io: any
 
     constructor(
         private zone: NgZone,
@@ -33,7 +35,6 @@ export class TerminalTabComponent extends BaseTabComponent<TerminalTab> {
         @Inject(TerminalDecorator) private decorators: TerminalDecorator[],
     ) {
         super()
-        this.startupTime = performance.now()
         this.configSubscription = config.change.subscribe(() => {
             this.configure()
         })
@@ -53,18 +54,13 @@ export class TerminalTabComponent extends BaseTabComponent<TerminalTab> {
 
         this.hterm.onTerminalReady = () => {
             this.hterm.installKeyboard()
-            let io = this.hterm.io.push()
-            this.attachIOHandlers(io)
+            this.io = this.hterm.io.push()
+            this.attachIOHandlers(this.io)
             const dataSubscription = this.model.session.dataAvailable.subscribe((data) => {
-                if (performance.now() - this.startupTime > 500)  {
-                    this.zone.run(() => {
-                        this.model.displayActivity()
-                    })
-                }
                 this.zone.run(() => {
                     this.output$.next(data)
                 })
-                io.writeUTF8(data)
+                this.write(data)
             })
             const closedSubscription = this.model.session.closed.subscribe(() => {
                 dataSubscription.unsubscribe()
@@ -75,6 +71,12 @@ export class TerminalTabComponent extends BaseTabComponent<TerminalTab> {
         }
         this.hterm.decorate(this.elementRef.nativeElement)
         this.configure()
+
+        setTimeout(() => {
+            this.output$.subscribe(() => {
+                this.model.displayActivity()
+            })
+        }, 1000)
     }
 
     attachHTermHandlers (hterm: any) {
@@ -85,23 +87,54 @@ export class TerminalTabComponent extends BaseTabComponent<TerminalTab> {
             })
         }
 
-        const oldInsertString = hterm.screen_.insertString.bind(hterm.screen_)
-        hterm.screen_.insertString = (data) => {
-            oldInsertString(data)
-            this.contentUpdated$.next()
+        const _decorate = hterm.scrollPort_.decorate.bind(hterm.scrollPort_)
+        hterm.scrollPort_.decorate = (...args) => {
+            _decorate(...args)
+            hterm.scrollPort_.screen_.style.cssText += `; padding-right: ${hterm.scrollPort_.screen_.offsetWidth - hterm.scrollPort_.screen_.clientWidth}px;`
         }
 
-        const oldDeleteChars = hterm.screen_.deleteChars.bind(hterm.screen_)
-        hterm.screen_.deleteChars = (count) => {
-            let ret = oldDeleteChars(count)
-            this.contentUpdated$.next()
-            return ret
+        const _setAlternateMode = hterm.setAlternateMode.bind(hterm)
+        hterm.setAlternateMode = (state) => {
+            _setAlternateMode(state)
+            this.alternateScreenActive$.next(state)
+        }
+
+        const _onPaste_ = hterm.onPaste_.bind(hterm)
+        hterm.onPaste_ = (event) => {
+            event.text = event.text.trim()
+            _onPaste_(event)
+        }
+
+        const _onMouse_ = hterm.onMouse_.bind(hterm)
+        hterm.onMouse_ = (event) => {
+            this.mouseEvent$.next(event)
+            if ((event.ctrlKey || event.metaKey) && event.type === 'mousewheel') {
+                event.preventDefault()
+                let delta = Math.round(event.wheelDeltaY / 50)
+                this.sendInput(((delta > 0) ? '\u001bOA' : '\u001bOB').repeat(Math.abs(delta)))
+            }
+            _onMouse_(event)
+        }
+
+        for (let screen of [hterm.primaryScreen_, hterm.alternateScreen_]) {
+            const _insertString = screen.insertString.bind(screen)
+            screen.insertString = (data) => {
+                _insertString(data)
+                this.contentUpdated$.next()
+            }
+
+            const _deleteChars = screen.deleteChars.bind(screen)
+            screen.deleteChars = (count) => {
+                let ret = _deleteChars(count)
+                this.contentUpdated$.next()
+                return ret
+            }
         }
     }
 
     attachIOHandlers (io: any) {
         io.onVTKeystroke = io.sendString = (data) => {
-            this.model.session.write(data)
+            this.sendInput(data)
             this.zone.run(() => {
                 this.input$.next(data)
             })
@@ -115,6 +148,14 @@ export class TerminalTabComponent extends BaseTabComponent<TerminalTab> {
         }
     }
 
+    sendInput (data: string) {
+        this.model.session.write(data)
+    }
+
+    write (data: string) {
+        this.io.writeUTF8(data)
+    }
+
     configure () {
         let config = this.config.full()
         preferenceManager.set('font-family', config.terminal.font)
@@ -133,5 +174,12 @@ export class TerminalTabComponent extends BaseTabComponent<TerminalTab> {
         })
         this.focusedSubscription.unsubscribe()
         this.configSubscription.unsubscribe()
+        this.title$.complete()
+        this.size$.complete()
+        this.input$.complete()
+        this.output$.complete()
+        this.contentUpdated$.complete()
+        this.alternateScreenActive$.complete()
+        this.mouseEvent$.complete()
     }
 }

app/src/terminal/hterm.ts

@@ -27,16 +27,4 @@ preferenceManager.set('color-palette-overrides', {
     0: '#1D272D',
 })
 
-const oldDecorate = hterm.hterm.ScrollPort.prototype.decorate
-hterm.hterm.ScrollPort.prototype.decorate = function (...args) {
-    oldDecorate.bind(this)(...args)
-    this.screen_.style.cssText += `; padding-right: ${this.screen_.offsetWidth - this.screen_.clientWidth}px;`
-}
-
-const oldPaste = hterm.hterm.Terminal.prototype.onPaste_
-hterm.hterm.Terminal.prototype.onPaste_ = function (e) {
-    e.text = e.text.trim()
-    oldPaste.bind(this)(e)
-}
-
 hterm.hterm.Terminal.prototype.showOverlay = () => null

app/src/terminal/index.ts

@@ -30,6 +30,7 @@ import { hterm } from './hterm'
         { provide: TabRecoveryProvider, useClass: RecoveryProvider, multi: true },
         SessionsService,
         { provide: SessionPersistenceProvider, useClass: ScreenPersistenceProvider },
+        // { provide: SessionPersistenceProvider, useValue: null },
         { provide: SettingsTabProvider, useClass: TerminalSettingsProvider, multi: true },
         { provide: ConfigProvider, useClass: TerminalConfigProvider, multi: true },
     ],

app/src/terminal/persistenceProviders.ts

@@ -47,9 +47,12 @@ export class ScreenPersistenceProvider extends SessionPersistenceProvider {
             term xterm-color
             bindkey "^[OH" beginning-of-line
             bindkey "^[OF" end-of-line
+            bindkey "\\027[?1049h" stuff ----alternate enter-----
+            bindkey "\\027[?1049l" stuff ----alternate leave-----
             termcapinfo xterm* 'hs:ts=\\E]0;:fs=\\007:ds=\\E]0;\\007'
             defhstatus "^Et"
             hardstatus off
+            altscreen on
         `, 'utf-8')
         let recoveryId = `term-tab-${Date.now()}`
         let args = ['-d', '-m', '-c', configPath, '-U', '-S', recoveryId, '--', options.command].concat(options.args || [])

app/src/terminal/services/sessions.ts

@@ -130,8 +130,10 @@ export class SessionsService {
     }
 
     async createNewSession (options: SessionOptions) : Promise<Session> {
-        let recoveryId = await this.persistence.startSession(options)
-        options = await this.persistence.attachSession(recoveryId)
+        if (this.persistence) {
+            let recoveryId = await this.persistence.startSession(options)
+            options = await this.persistence.attachSession(recoveryId)
+        }
         let session = this.addSession(options)
         return session
     }
@@ -142,7 +144,9 @@ export class SessionsService {
         let session = new Session(options)
         const destroySubscription = session.destroyed.subscribe(() => {
             delete this.sessions[session.name]
-            this.persistence.terminateSession(session.recoveryId)
+            if (this.persistence) {
+                this.persistence.terminateSession(session.recoveryId)
+            }
             destroySubscription.unsubscribe()
         })
         this.sessions[session.name] = session
@@ -150,6 +154,9 @@ export class SessionsService {
     }
 
     async recover (recoveryId: string) : Promise<Session> {
+        if (!this.persistence) {
+            return null
+        }
         const options = await this.persistence.attachSession(recoveryId)
         if (!options) {
             return null