Persist output names in cell attributes

This is needed to be able to allow for rendering cells without starting
the engine.

src/StencilaArchive.js

@@ -1,6 +1,7 @@
 import { prettyPrintXML } from 'substance'
-import { JATSExporter, TextureArchive } from 'substance-texture'
+import { TextureArchive } from 'substance-texture'
 import ArticleLoader from './article/ArticleLoader'
+import ArticleExporter from './article/ArticleExporter'
 import SheetLoader from './sheet/SheetLoader'
 
 export default class StencilaArchive extends TextureArchive {
@@ -66,19 +67,7 @@ export default class StencilaArchive extends TextureArchive {
   _exportDocument(type, session, sessions) {
     switch (type) {
       case 'article': {
-        // FIXME: hard-coded, and thus bad
-        // TODO: export only those resources which have been changed
-        // Also we need to
-        let jatsExporter = new JATSExporter()
-        let pubMetaDb = sessions['pub-meta'].getDocument()
-        let doc = session.getDocument()
-        let dom = doc.toXML()
-        let res = jatsExporter.export(dom, { pubMetaDb, doc })
-        console.info('saving jats', res.dom.getNativeElement())
-        // TODO: bring back pretty printing (currently messes up CDATA content)
-        let xmlStr = prettyPrintXML(res.dom)
-        //let xmlStr = res.dom.serialize()
-        return xmlStr
+        return ArticleExporter.export(session, { sessions })
       }
       case 'sheet': {
         let dom = session.getDocument().toXML()

src/article/ArticleExporter.js

@@ -0,0 +1,23 @@
+import { prettyPrintXML } from 'substance'
+import { JATSExporter } from 'substance-texture'
+import persistCellStates from './persistCellStates'
+
+export default {
+  export (session, { sessions }) {
+    // FIXME: hard-coded, and thus bad
+    // TODO: export only those resources which have been changed
+    // Also we need to
+    let jatsExporter = new JATSExporter()
+    let pubMetaDb = sessions['pub-meta'].getDocument()
+    let doc = session.getDocument()
+    let dom = doc.toXML()
+
+    let res = jatsExporter.export(dom, { pubMetaDb, doc })
+    persistCellStates(doc, res.dom)
+
+    console.info('saving jats', res.dom.getNativeElement())
+    // TODO: bring back pretty printing (currently messes up CDATA content)
+    let xmlStr = prettyPrintXML(res.dom)
+    return xmlStr
+  }
+}

src/article/persistCellStates.js

@@ -0,0 +1,13 @@
+import { forEach } from 'substance'
+
+export default function persistCellStates (doc, dom) {
+  let cells = doc.getIndex('type').get('cell')
+  forEach(cells, cell => {
+    let el = dom.find(`#${cell.id}`)
+    let state = cell.state
+    // store the cell output
+    if (state.output) {
+      el.attr('output-name', state.output)
+    }
+  })
+}