Add month normalization to AstroPhysicsFetcher

src/main/java/org/jabref/logic/importer/fetcher/AstrophysicsDataSystem.java

@@ -14,6 +14,7 @@
 
 import org.jabref.logic.cleanup.MoveFieldCleanup;
 import org.jabref.logic.formatter.bibtexfields.ClearFormatter;
+import org.jabref.logic.formatter.bibtexfields.NormalizeMonthFormatter;
 import org.jabref.logic.formatter.bibtexfields.NormalizeNamesFormatter;
 import org.jabref.logic.formatter.bibtexfields.RemoveBracesFormatter;
 import org.jabref.logic.formatter.bibtexfields.RemoveNewlinesFormatter;
@@ -143,6 +144,7 @@ public void doPostCleanup(BibEntry entry) {
         new FieldFormatterCleanup(StandardField.ABSTRACT, new RemoveNewlinesFormatter()).cleanup(entry);
         new FieldFormatterCleanup(StandardField.TITLE, new RemoveBracesFormatter()).cleanup(entry);
         new FieldFormatterCleanup(StandardField.AUTHOR, new NormalizeNamesFormatter()).cleanup(entry);
+        new FieldFormatterCleanup(StandardField.MONTH, new NormalizeMonthFormatter()).cleanup(entry);
 
         // Remove ADS note
         new FieldFormatterCleanup(new UnknownField("adsnote"), new ClearFormatter()).cleanup(entry);
@@ -249,7 +251,6 @@ public Optional<BibEntry> performSearchById(String identifier) throws FetcherExc
      * bibcodes
      */
     private List<BibEntry> performSearchByIds(Collection<String> identifiers) throws FetcherException {
-
         List<String> ids = identifiers.stream().filter(identifier -> !StringUtil.isBlank(identifier)).collect(Collectors.toList());
         if (ids.isEmpty()) {
             return Collections.emptyList();

src/main/java/org/jabref/model/cleanup/FieldFormatterCleanup.java

@@ -49,15 +49,15 @@ public List<FieldChange> cleanup(BibEntry entry) {
     private List<FieldChange> cleanupSingleField(Field fieldKey, BibEntry entry) {
         if (!entry.hasField(fieldKey)) {
             // Not set -> nothing to do
-            return new ArrayList<>();
+            return Collections.emptyList();
         }
         String oldValue = entry.getField(fieldKey).orElse(null);
 
         // Run formatter
         String newValue = formatter.format(oldValue);
 
         if (oldValue.equals(newValue)) {
-            return new ArrayList<>();
+            return Collections.emptyList();
         } else {
             if (newValue.isEmpty()) {
                 entry.clearField(fieldKey);

src/main/java/org/jabref/model/entry/BibEntry.java

@@ -508,7 +508,7 @@ public void setField(Map<Field, String> fields) {
     /**
      * Set a field, and notify listeners about the change.
      *
-     * @param field        The field to set
+     * @param field       The field to set
      * @param value       The value to set
      * @param eventSource Source the event is sent from
      */
@@ -543,16 +543,15 @@ public Optional<FieldChange> setField(Field field, String value, EntriesEventSou
     /**
      * Set a field, and notify listeners about the change.
      *
-     * @param field  The field to set.
+     * @param field The field to set.
      * @param value The value to set.
      */
     public Optional<FieldChange> setField(Field field, String value) {
         return setField(field, value, EntriesEventSource.LOCAL);
     }
 
     /**
-     * Remove the mapping for the field name, and notify listeners about
-     * the change.
+     * Remove the mapping for the field name, and notify listeners about the change.
      *
      * @param field The field to clear.
      */
@@ -588,9 +587,9 @@ public Optional<FieldChange> clearField(Field field, EntriesEventSource eventSou
      * database argument is given, this method will try to look up missing fields in
      * entries linked by the "crossref" field, if any.
      *
-     * @param fields An array of field names to be checked.
-     * @param database  The database in which to look up crossref'd entries, if any. This
-     *                  argument can be null, meaning that no attempt will be made to follow crossrefs.
+     * @param fields   An array of field names to be checked.
+     * @param database The database in which to look up crossref'd entries, if any. This argument can be null, meaning
+     *                 that no attempt will be made to follow crossrefs.
      * @return true if all fields are set or could be resolved, false otherwise.
      */
     public boolean allFieldsPresent(Collection<OrFields> fields, BibDatabase database) {
@@ -610,9 +609,11 @@ public Object clone() {
 
     /**
      * This returns a canonical BibTeX serialization. Special characters such as "{" or "&" are NOT escaped, but written
-     * as is
+     * as is. In case the JabRef "hack" for distinguishing "field = value" and "field = {value}" (in .bib files) is
+     * used, it is output as "field = {#value#}", which may cause headaches in debugging. We nevertheless do it this way
+     * to a) enable debugging the internal representation and b) save time at this method.
      * <p>
-     * Serializes all fields, even the JabRef internal ones. Does NOT serialize "KEY_FIELD" as field, but as key
+     * Serializes all fields, even the JabRef internal ones. Does NOT serialize "KEY_FIELD" as field, but as key.
      */
     @Override
     public String toString() {

src/test/java/org/jabref/logic/formatter/bibtexfields/NormalizeMonthFormatterTest.java

@@ -21,4 +21,9 @@ public void setUp() {
     public void formatExample() {
         assertEquals("#dec#", formatter.format(formatter.getExampleInput()));
     }
+
+    @Test
+    public void plainAprilShouldBeApril() {
+        assertEquals("#apr#", formatter.format("#apr#"));
+    }
 }