Move mobiledoc knowledge out of {{gh-markdown-editor}}

no issue
- pre-requisite for using `{{gh-markdown-editor}}` inside a Koenig card
- switch to passing markdown into `{{gh-markdown-editor}}`
- move markdown->mobiledoc logic into the `editor` controller

app/components/gh-markdown-editor.js

@@ -4,27 +4,11 @@ import ctrlOrCmd from 'ghost-admin/utils/ctrl-or-cmd';
 import formatMarkdown from 'ghost-admin/utils/format-markdown';
 import {assign} from '@ember/polyfills';
 import {computed} from '@ember/object';
-import {copy} from '@ember/object/internals';
 import {htmlSafe} from '@ember/string';
 import {isEmpty, typeOf} from '@ember/utils';
 import {run} from '@ember/runloop';
 import {inject as service} from '@ember/service';
 
-const MOBILEDOC_VERSION = '0.3.1';
-
-export const BLANK_DOC = {
-    version: MOBILEDOC_VERSION,
-    markups: [],
-    atoms: [],
-    cards: [
-        ['card-markdown', {
-            cardName: 'card-markdown',
-            markdown: ''
-        }]
-    ],
-    sections: [[10, 0]]
-};
-
 export default Component.extend(ShortcutsMixin, {
 
     config: service(),
@@ -41,17 +25,14 @@ export default Component.extend(ShortcutsMixin, {
     autofocus: false,
     imageMimeTypes: null,
     isFullScreen: false,
-    mobiledoc: null,
+    markdown: null,
     options: null,
     placeholder: '',
     showMarkdownHelp: false,
     uploadedImageUrls: null,
 
     shortcuts: null,
 
-    // Internal attributes
-    markdown: null,
-
     // Private
     _editor: null,
     _editorFocused: false,
@@ -187,7 +168,6 @@ export default Component.extend(ShortcutsMixin, {
     // extract markdown content from single markdown card
     didReceiveAttrs() {
         this._super(...arguments);
-        let mobiledoc = this.get('mobiledoc') || copy(BLANK_DOC, true);
 
         let uploadedImageUrls = this.get('uploadedImageUrls');
         if (!isEmpty(uploadedImageUrls) && uploadedImageUrls !== this._uploadedImageUrls) {
@@ -200,14 +180,10 @@ export default Component.extend(ShortcutsMixin, {
             });
         }
 
-        // eslint-disable-next-line ember-suave/prefer-destructuring
-        let markdown = mobiledoc.cards[0][1].markdown;
-        this.set('markdown', markdown);
-
         // focus the editor when the markdown value changes, this is necessary
         // because both the autofocus and markdown values can change without a
         // re-render, eg. navigating from edit->new
-        if (this._editor && markdown !== this._editor.value() && this.get('autofocus')) {
+        if (this.get('autofocus') && this._editor && this.get('markdown') !== this._editor.value()) {
             this.send('focusEditor');
         }
 
@@ -255,11 +231,9 @@ export default Component.extend(ShortcutsMixin, {
     },
 
     actions: {
-        // put the markdown into a new mobiledoc card, trigger external update
+        // trigger external update, any mobiledoc updates are handled there
         updateMarkdown(markdown) {
-            let mobiledoc = copy(BLANK_DOC, true);
-            mobiledoc.cards[0][1].markdown = markdown;
-            this.onChange(mobiledoc);
+            this.onChange(markdown);
         },
 
         // store a reference to the simplemde editor so that we can handle

app/controllers/editor.js

@@ -3,9 +3,11 @@ import Ember from 'ember';
 import PostModel from 'ghost-admin/models/post';
 import boundOneWay from 'ghost-admin/utils/bound-one-way';
 import isNumber from 'ghost-admin/utils/isNumber';
+import {BLANK_MARKDOWN} from 'ghost-admin/models/post';
 import {alias, mapBy, reads} from '@ember/object/computed';
 import {computed} from '@ember/object';
 import {inject as controller} from '@ember/controller';
+import {copy} from '@ember/object/internals';
 import {htmlSafe} from '@ember/string';
 import {isBlank} from '@ember/utils';
 import {isArray as isEmberArray} from '@ember/array';
@@ -122,6 +124,14 @@ export default Controller.extend({
 
     _tagNames: mapBy('post.tags', 'name'),
 
+    markdown: computed('post.mobiledoc', function () {
+        if (this.get('post').isCompatibleWithMarkdownEditor()) {
+            let mobiledoc = this.get('post.mobiledoc');
+            let markdown = mobiledoc.cards[0][1].markdown;
+            return markdown;
+        }
+    }),
+
     // computed.apply is a bit of an ugly hack, but necessary to watch all the
     // post's attributes and more without having to be explicit and remember
     // to update the watched props list every time we add a new post attr
@@ -157,6 +167,14 @@ export default Controller.extend({
             this.get('_timedSave').perform();
         },
 
+        // TODO: Only used by the markdown editor, ensure it's removed when
+        // we switch to Koenig
+        updateMarkdown(markdown) {
+            let mobiledoc = copy(BLANK_MARKDOWN, true);
+            mobiledoc.cards[0][1].markdown = markdown;
+            this.send('updateScratch', mobiledoc);
+        },
+
         updateTitleScratch(title) {
             this.set('post.titleScratch', title);
         },

app/models/post.js

@@ -4,19 +4,33 @@ import ValidationEngine from 'ghost-admin/mixins/validation-engine';
 import attr from 'ember-data/attr';
 import boundOneWay from 'ghost-admin/utils/bound-one-way';
 import moment from 'moment';
-import {BLANK_DOC as BLANK_MARKDOWN} from 'ghost-admin/components/gh-markdown-editor';
 import {BLANK_DOC as BLANK_MOBILEDOC} from 'koenig-editor/components/koenig-editor';
 import {belongsTo, hasMany} from 'ember-data/relationships';
 import {compare} from '@ember/utils';
-import {computed} from '@ember/object';
+import {computed, observer} from '@ember/object';
+import {copy} from '@ember/object/internals';
 import {equal, filterBy} from '@ember/object/computed';
 import {isBlank} from '@ember/utils';
-import {observer} from '@ember/object';
 import {inject as service} from '@ember/service';
 
 // ember-cli-shims doesn't export these so we must get them manually
 const {Comparable} = Ember;
 
+// for our markdown-only editor we need to build a blank mobiledoc
+const MOBILEDOC_VERSION = '0.3.1';
+export const BLANK_MARKDOWN = {
+    version: MOBILEDOC_VERSION,
+    markups: [],
+    atoms: [],
+    cards: [
+        ['card-markdown', {
+            cardName: 'card-markdown',
+            markdown: ''
+        }]
+    ],
+    sections: [[10, 0]]
+};
+
 function statusCompare(postA, postB) {
     let status1 = postA.get('status');
     let status2 = postB.get('status');
@@ -129,9 +143,9 @@ export default Model.extend(Comparable, ValidationEngine, {
             let defaultValue;
 
             if (this.get('feature.koenigEditor')) {
-                defaultValue = BLANK_MOBILEDOC;
+                defaultValue = copy(BLANK_MOBILEDOC, true);
             } else {
-                defaultValue = BLANK_MARKDOWN;
+                defaultValue = copy(BLANK_MARKDOWN, true);
             }
 
             // using this.set() adds the property to the changedAttributes list

app/templates/editor.hbs

@@ -68,9 +68,9 @@
                 placeholder="Begin writing your story..."
                 autofocus=shouldFocusEditor
                 uploadedImageUrls=editor.uploadedImageUrls
-                mobiledoc=(readonly post.scratch)
+                markdown=(readonly markdown)
                 isFullScreen=editor.isFullScreen
-                onChange=(action "updateScratch")
+                onChange=(action "updateMarkdown")
                 onFullScreenToggle=(action editor.toggleFullScreen)
                 onPreviewToggle=(action editor.togglePreview)
                 onSplitScreenToggle=(action editor.toggleSplitScreen)