Clear scrollback on hard reset

butterfly/static/main.js

@@ -912,6 +912,7 @@
                 this.state = State.ignore;
                 break;
               case "c":
+                this.clearScrollback();
                 this.reset();
                 break;
               case "E":
@@ -1927,6 +1928,25 @@
       return this.refresh(true);
     };
 
+    Terminal.prototype.clearScrollback = function() {
+      var group, k, len, len1, line, lines, m, ref, ref1;
+      lines = document.querySelectorAll('.line');
+      if (lines.length > this.rows) {
+        ref = Array.prototype.slice.call(lines, 0, lines.length - this.rows);
+        for (k = 0, len = ref.length; k < len; k++) {
+          line = ref[k];
+          line.remove();
+        }
+        ref1 = document.querySelectorAll('.group:empty');
+        for (m = 0, len1 = ref1.length; m < len1; m++) {
+          group = ref1[m];
+          group.remove();
+        }
+        lines = document.querySelectorAll('.line');
+      }
+      return this.children = Array.prototype.slice.call(lines, -this.rows);
+    };
+
     Terminal.prototype.tabSet = function() {
       this.tabs[this.x] = true;
       return this.state = State.normal;

coffees/term.coffee

@@ -733,6 +733,7 @@ class Terminal
 
             # ESC c Full Reset (RIS).
             when "c"
+              @clearScrollback()
               @reset()
 
             # ESC E Next Line ( NEL is 0x85).
@@ -1731,6 +1732,21 @@ class Terminal
     @resetVars()
     @refresh(true)
 
+  clearScrollback: ->
+    # In case of real hard reset
+    # Drop DOM history
+    lines = document.querySelectorAll('.line')
+    if lines.length > @rows
+      for line in Array.prototype.slice.call(
+        lines, 0, lines.length - @rows)
+          line.remove()
+      for group in document.querySelectorAll('.group:empty')
+        group.remove()
+      lines = document.querySelectorAll('.line')
+    @children = Array.prototype.slice.call(
+      lines, -@rows)
+
+
   # ESC H Tab Set (HTS is 0x88).
   tabSet: ->
     @tabs[@x] = true