Find and change last paragraph style

Question

With .js or grep, I want to change the style of the last bullet paragraph to one with more space after, there are many of them in one story mixed with other styles.
Change this:
blarr blarrblarr (bullet style)
blarr blarr blarr blarr (bullet style)
blarr blarr change this one (bullet style)
To this:
blarr blarrblarr (bullet style)
blarr blarr blarr blarr (bullet style)
blarr blarr change this one (last bullet style)
Can this be done? If anyone can help, it would be great!
Many thanks!

Answer 1

I reckon this JavaScript does the job. You might have to change the style names to match yours. Also, it assumes that the styles aren't grouped in a folder.
//DESCRIPTION: Fix last bullet paragraphs
(function() {
     if (app.documents.length > 0) {
          findFixLastBullets(app.documents[0]);
     function findFixLastBullets(aDoc) {
          setupFindText();
          app.findTextPreferences.appliedParagraphStyle =  "Bullet";
          var myFinds = aDoc.findText();
          for (var j = myFinds.length - 1; j >= 0; j--) {
              var lastPara = myFinds[j].paragraphs[-1];
              // if next para already BulletLast do nothing
              var nextPara = lastPara.insertionPoints[-1].paragraphs[0];
              if (nextPara.appliedParagraphStyle.name == "BulletLast") continue;
              lastPara.appliedParagraphStyle = "BulletLast";
     function setupFindText(find, change, wholeWd, caseSense, foots, hidLayers, lockedLayers, lockedStories, masters) {
     app.findTextPreferences = null;
     app.changeTextPreferences = null;
     try { app.findTextPreferences.findWhat = find } catch(e) {};
     try {app.changeTextPreferences.changeTo = change } catch(e) {};
     app.findChangeTextOptions.properties = {
          caseSensitive:(caseSense == null ? false : caseSense),
          wholeWord:(wholeWd == null ? false : wholeWd),
          includeFootnotes:(foots == null ? false : foots),
          includeHiddenLayers:(hidLayers == null ? false : hidLayers),
          includeLockedLayersForFind:(lockedLayers == null ? false : lockedLayers),
          includeLockedStoriesForFind:(lockedStories == null ? false : lockedStories),
          includeMasterPages:(masters == null ? false : masters)
} // end setupFindText
Notice the little touch that if the next paragraph is already BulletLast it ignores that found text. This allows you to run the script more than once if you add more text.
Dave