Tags with only tagsymbols should not be tags

Text made up only of tagsymbols should not be treated as a tag.

Closes jrnl-org#1700

jrnl/journals/Entry.py

@@ -90,10 +90,22 @@ def tag_regex(tagsymbols: str) -> re.Pattern:
 
     def _parse_tags(self) -> set[str]:
         tagsymbols = self.journal.config["tagsymbols"]
-        return {
+        if len(tagsymbols) == 0:
+            return set()
+
+        # We start by looking for everything that could be a tag (basically, any word
+        # that starts with a tag symbol)
+        tag_candidates = {
             tag.lower() for tag in re.findall(Entry.tag_regex(tagsymbols), self.text)
         }
 
+        # Then we drop all the candidates that are exclusively composed of tag symbols
+        actual_tags = {
+            tag for tag in tag_candidates if any([c not in tagsymbols for c in tag])
+        }
+
+        return actual_tags
+
     def __str__(self):
         """Returns string representation of the entry to be written to journal file."""
         date_str = self.date.strftime(self.journal.config["timeformat"])

tests/unit/test_entry.py

@@ -0,0 +1,36 @@
+import pytest
+
+from jrnl.journals.Entry import Entry
+from jrnl.journals.Journal import Journal
+
+
+@pytest.mark.parametrize(
+    "text, tag_symbols, expected_tags",
+    [
+        ("This has no tag symbols", "", []),
+        ("This has no tags and a single tag symbol", "@", []),
+        ("This has no tags and multiple tag symbols", "@#", []),
+        ("This has a @simple tag", "@", ["@simple"]),
+        ("Tag can contain some punctuation @simple-tag.", "@", ["@simple-tag"]),
+        ("This has a tag at the end of a sentence @simple.", "@", ["@simple"]),
+        ("This has an empty @ tag", "@", []),
+        ("This text has @multiple @tags", "@", ["@multiple", "@tags"]),
+        ("@@@@ This text has no tags", "@", []),
+        ("@@@# This text has no @### tags", "@#", []),
+        ("@@@#tag1 This text has two #@#@tags", "@#", ["@@@#tag1", "#@#@tags"]),
+        (
+            "@prefix#tag1 This text has two #prefix@tag2",
+            "@#",
+            ["@prefix#tag1", "#prefix@tag2"],
+        ),
+    ],
+)
+def test_tag_extraction(text, tag_symbols, expected_tags):
+    jrnl = Journal()
+    jrnl.config["tagsymbols"] = tag_symbols
+
+    entry = Entry(jrnl, date=None, text=text)
+    if entry.tags != expected_tags:
+        pass
+
+    assert sorted(entry.tags) == sorted(expected_tags)