feat: scroll to today

src/index.js

@@ -100,6 +100,7 @@ export default class Gantt {
       language: "en",
       readonly: false,
       highlight_weekend: true,
+      scroll_today: true
     };
     this.options = Object.assign({}, default_options, options);
     if (!options.view_mode_padding) options.view_mode_padding = {}
@@ -337,6 +338,7 @@ export default class Gantt {
     this.map_arrows_on_bars();
     this.set_width();
     this.set_scroll_position();
+    if (this.options.scroll_today) this.scroll_today()
   }
 
   setup_layers() {
@@ -742,13 +744,17 @@ export default class Gantt {
     }
   }
 
-  set_scroll_position() {
+  set_scroll_position(date) {
+    if (!date) {
+      date = this.gantt_start
+    }
+
     const parent_element = this.$svg.parentElement;
     if (!parent_element) return;
 
     const hours_before_first_task = date_utils.diff(
       this.get_oldest_starting_date(),
-      this.gantt_start,
+      date,
       "hour",
     );
 
@@ -760,6 +766,12 @@ export default class Gantt {
     parent_element.scrollLeft = scroll_pos;
   }
 
+  scroll_today() {
+    const oldest = this.get_oldest_starting_date().getTime()
+    const t = new Date() - oldest
+    this.set_scroll_position(new Date(this.gantt_start.getTime() - t))
+  }
+
   bind_grid_click() {
     $.on(
       this.$svg,