From 4370f3308923c90ad09a1d0cacdc41358a645c4c Mon Sep 17 00:00:00 2001
From: Kevin Ansfield <kevin@lookingsideways.co.uk>
Date: Thu, 17 May 2018 16:46:25 +0100
Subject: [PATCH] Koenig - Convert <br>s to soft-break atoms on paste

refs https://github.com/TryGhost/Ghost/issues/9623
- adds `parserPlugins` option with array of parser plugins that read node values and convert them when pasting
- converts `<br>` to a soft-break atom for line breaks
- removes leading newlines from text nodes to avoid leading spaces in the render output (common when pasting MD with line breaks)
---
 .../addon/components/koenig-editor.js         |  2 ++
 .../addon/options/parser-plugins.js           | 27 +++++++++++++++++++
 2 files changed, 29 insertions(+)
 create mode 100644 lib/koenig-editor/addon/options/parser-plugins.js

diff --git a/lib/koenig-editor/addon/components/koenig-editor.js b/lib/koenig-editor/addon/components/koenig-editor.js
index 5026ebb08..6692bf417 100644
--- a/lib/koenig-editor/addon/components/koenig-editor.js
+++ b/lib/koenig-editor/addon/components/koenig-editor.js
@@ -12,6 +12,7 @@ import defaultAtoms from '../options/atoms';
 import defaultCards from '../options/cards';
 import formatMarkdown from 'ghost-admin/utils/format-markdown';
 import layout from '../templates/components/koenig-editor';
+import parserPlugins from '../options/parser-plugins';
 import registerKeyCommands from '../options/key-commands';
 import registerTextExpansions from '../options/text-expansions';
 import validator from 'npm:validator';
@@ -225,6 +226,7 @@ export default Component.extend({
         editorOptions.mobiledoc = mobiledoc;
         editorOptions.showLinkTooltips = false;
         editorOptions.undoDepth = UNDO_DEPTH;
+        editorOptions.parserPlugins = parserPlugins;
 
         let componentHooks = {
             // triggered when a card section is added to the mobiledoc
diff --git a/lib/koenig-editor/addon/options/parser-plugins.js b/lib/koenig-editor/addon/options/parser-plugins.js
new file mode 100644
index 000000000..1ac0b71a2
--- /dev/null
+++ b/lib/koenig-editor/addon/options/parser-plugins.js
@@ -0,0 +1,27 @@
+// mobiledoc by default ignores <BR> tags but we have a custom SoftReturn atom
+export function brToSoftBreakAtom(node, builder, {addMarkerable, nodeFinished}) {
+    if (node.nodeType !== 1 || node.tagName !== 'BR') {
+        return;
+    }
+
+    let softReturn = builder.createAtom('soft-return');
+    addMarkerable(softReturn);
+
+    nodeFinished();
+}
+
+// leading newlines in text nodes will add a space to the beginning of the text
+// which doesn't render correctly if we're replacing <br> with SoftReturn atoms
+// after parsing text as markdown to html
+export function removeLeadingNewline(node) {
+    if (node.nodeType !== 3 || node.nodeName !== '#text') {
+        return;
+    }
+
+    node.nodeValue = node.nodeValue.replace(/^\n/, '');
+}
+
+export default [
+    brToSoftBreakAtom,
+    removeLeadingNewline,
+];