Provide native links for description timestamps, and re-clickability for these

1 files changed, 45 insertions, 0 deletions

diff --git a/client/src/app/shared/angular/timestamp-route-transformer.directive.ts b/client/src/app/shared/angular/timestamp-route-transformer.directive.ts
new file mode 100644
index 000000000..d71077d10
--- /dev/null
+++ b/client/src/app/shared/angular/timestamp-route-transformer.directive.ts
@@ -0,0 +1,45 @@
+import { Directive, ElementRef, HostListener, Output, EventEmitter } from '@angular/core'
+import { Router } from '@angular/router'
+
+type ElementEvent = Omit<Event, 'target'> & {
+  target: HTMLInputElement
+}
+
+@Directive({
+  selector: '[timestampRouteTransformer]'
+})
+export class TimestampRouteTransformerDirective {
+  @Output() timestampClicked = new EventEmitter<number>()
+
+  constructor (private el: ElementRef, private router: Router) { }
+
+  @HostListener('click', ['$event'])
+  public onClick ($event: ElementEvent) {
+    if ($event.target.hasAttribute('href')) {
+      const ngxLink = document.createElement('a')
+      ngxLink.href = $event.target.getAttribute('href')
+
+      // we only care about reflective links
+      if (ngxLink.host !== window.location.host) return
+
+      const ngxLinkParams = new URLSearchParams(ngxLink.search)
+      if (ngxLinkParams.has('start')) {
+        const separators = ['h', 'm', 's']
+        const start = ngxLinkParams
+          .get('start')
+          .match(new RegExp('(\\d{1,9}[' + separators.join('') + '])','g')) // match digits before any given separator
+          .map(t => {
+            if (t.includes('h')) return parseInt(t, 10) * 3600
+            if (t.includes('m')) return parseInt(t, 10) * 60
+            return parseInt(t, 10)
+          })
+          .reduce((acc, t) => acc + t)
+        this.timestampClicked.emit(start)
+      }
+
+      $event.preventDefault()
+    }
+
+    return
+  }
+}