fix(signatures): Wrap signature in a nylas-n1-signature div to allow easy detection

Summary:
Changes the internal signatures plugin to wrap the signature in a
`<div class="nylas-n1-signature">` block, to make it easier to detect and handle
signatures from within other plugins.

Also:
- Fixes the QuickSchedule plugin to place the scheduling block above the signature.
- Fixes a small syntax error in Translate plugin

Test Plan: manual

Reviewers: evan

Reviewed By: evan

Differential Revision: https://phab.nylas.com/D2383

examples/N1-Composer-Translate/lib/main.cjsx

@@ -71,7 +71,7 @@ class TranslateButton extends React.Component
   #
   _renderButton: =>
     <button className="btn btn-toolbar" title="Translate">
-      <RetinaImg mode={RetinaImg.Mode.ContentIsMask} url="nylas://N1-Composer-Translate/assets/translate-icon@2x.png" style={}/>
+      <RetinaImg mode={RetinaImg.Mode.ContentIsMask} url="nylas://N1-Composer-Translate/assets/translate-icon@2x.png" />
       <span style={fontSize: "9px", verticalAlign: "top"}>▼</span>
     </button>
 

examples/N1-Quick-Schedule/lib/main.cjsx

@@ -131,14 +131,21 @@ module.exports =
     # Obtain the session for the current draft.
     DraftStore.sessionForClientId(draftClientId).then (session) =>
       draftHtml = session.draft().body
+      # Remove any quoted text at the end of the message
       text = QuotedHTMLTransformer.removeQuotedHTML(draftHtml)
 
-      # add the block
-      text += "<br/>"+@_createBlock(events,eventData)+"<br/>"
+      # Check for an N1 signature and split that off
+      sigIndex = text.indexOf('<div class="nylas-n1-signature">')
+      beforeSig = if sigIndex>-1 then text.slice(0,sigIndex) else text
+      afterSig = text.slice(beforeSig.length)
 
+      # Add the block and add back the signature if present
+      text = beforeSig+"<br/>"+@_createBlock(events,eventData)+"<br/>"+afterSig
+
+      # Add back any quoted text
       newDraftHtml = QuotedHTMLTransformer.appendQuotedHTML(text, draftHtml)
 
-      # update the draft
+      # Update the draft
       session.changes.add(body: newDraftHtml)
       session.changes.commit()
 

internal_packages/composer-signature/lib/signature-composer-extension.coffee

@@ -9,6 +9,6 @@ class SignatureComposerExtension extends ComposerExtension
     insertionPoint = draft.body.indexOf('<blockquote')
     if insertionPoint is -1
       insertionPoint = draft.body.length
-    draft.body = draft.body.substr(0, insertionPoint-1) + "<br/>" + signature + draft.body.substr(insertionPoint)
+    draft.body = draft.body.slice(0, insertionPoint) + '<br/><div class="nylas-n1-signature">' + signature + "</div>" + draft.body.slice(insertionPoint)
 
 module.exports = SignatureComposerExtension