Support exact search

app/src/main/java/org/schabi/newpipe/fragments/list/search/SearchFragment.java

@@ -1,6 +1,8 @@
 package org.schabi.newpipe.fragments.list.search;
 
 import static androidx.recyclerview.widget.ItemTouchHelper.Callback.makeMovementFlags;
+import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.ALL;
+import static org.schabi.newpipe.extractor.services.youtube.linkHandler.YoutubeSearchQueryHandlerFactory.EXACT;
 import static org.schabi.newpipe.extractor.utils.Utils.isBlank;
 import static org.schabi.newpipe.ktx.ViewUtils.animate;
 import static org.schabi.newpipe.util.ExtractorHelper.showMetaInfoInTextView;
@@ -845,7 +847,24 @@ private void search(@NonNull final String theSearchString,
 
         // prepare search
         lastSearchedString = this.searchString;
-        this.searchString = theSearchString;
+        searchString = theSearchString;
+
+        // Always remove EXACT search initially so it doesn't persist over multiple searches
+        final List<String> tempContentFilter = new ArrayList<>(Arrays.asList(contentFilter));
+        tempContentFilter.remove(EXACT);
+        contentFilter = tempContentFilter.toArray(new String[0]);
+
+        // If quotes are around the search string EXACT search is enabled
+        // Overrides ALL and is otherwise appended to existing filters
+        if (searchString.charAt(0) == '\"'
+                && searchString.charAt(searchString.length() - 1) == '\"') {
+            if (contentFilter.length == 0 || contentFilter[0].equals(ALL)) {
+                contentFilter = new String[]{EXACT};
+            } else {
+                contentFilter = new String[]{contentFilter[0], EXACT};
+            }
+        }
+
         infoListAdapter.clearStreamItemList();
         hideSuggestionsPanel();
         showMetaInfoInTextView(null, searchBinding.searchMetaInfoTextView,
@@ -867,6 +886,15 @@ private void search(@NonNull final String theSearchString,
         startLoading(false);
     }
 
+    /**
+     * Adjusts the search string from EXACT searches for queries (removes the surrounding quotes).
+     * @return The adjusted search string
+     */
+    private String getExactSearchAdjustedString() {
+        return Arrays.asList(contentFilter).contains(EXACT)
+                ? searchString.substring(1, searchString.length() - 1) : searchString;
+    }
+
     @Override
     public void startLoading(final boolean forceLoad) {
         super.startLoading(forceLoad);
@@ -875,14 +903,13 @@ public void startLoading(final boolean forceLoad) {
             searchDisposable.dispose();
         }
         searchDisposable = ExtractorHelper.searchFor(serviceId,
-                searchString,
+                getExactSearchAdjustedString(),
                 Arrays.asList(contentFilter),
                 sortFilter)
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .doOnEvent((searchResult, throwable) -> isLoading.set(false))
                 .subscribe(this::handleResult, this::onItemError);
-
     }
 
     @Override
@@ -897,7 +924,7 @@ protected void loadMoreItems() {
         }
         searchDisposable = ExtractorHelper.getMoreSearchItems(
                 serviceId,
-                searchString,
+                getExactSearchAdjustedString(),
                 asList(contentFilter),
                 sortFilter,
                 nextPage)