Option to add triggers when enabling FTS (#57)

--create-triggers CLI option and create_triggers=True in the Python library

* Add an option to create triggers for fts table.
* Add cli option for the create-update-trigger.
* Add tests for the create-update-trigger option.
* Change FTS table escaping to square brackets.

tests/test_cli.py

@@ -315,6 +315,7 @@ def test_index_foreign_keys(db_path):
     db = Database(db_path)
     assert [] == db["books"].indexes
     result = CliRunner().invoke(cli.cli, ["index-foreign-keys", db_path])
+    assert 0 == result.exit_code
     assert [["author_id"], ["author_name_ref"]] == [
         i.columns for i in db["books"].indexes
     ]
@@ -328,6 +329,43 @@ def test_enable_fts(db_path):
     assert 0 == result.exit_code
     assert "Gosh_fts" == Database(db_path)["Gosh"].detect_fts()
 
+    # Table names with restricted chars are handled correctly.
+    # colons and dots are restricted characters for table names.
+    Database(db_path)["http://example.com"].create({"c1": str, "c2": str, "c3": str})
+    assert None == Database(db_path)["http://example.com"].detect_fts()
+    result = CliRunner().invoke(
+        cli.cli, ["enable-fts", db_path, "http://example.com", "c1", "--fts4"]
+    )
+    assert 0 == result.exit_code
+    assert (
+        "http://example.com_fts" == Database(db_path)["http://example.com"].detect_fts()
+    )
+    Database(db_path)["http://example.com"].drop()
+
+
+def test_enable_fts_with_triggers(db_path):
+    Database(db_path)["Gosh"].insert_all([{"c1": "baz"}])
+    exit_code = (
+        CliRunner()
+        .invoke(
+            cli.cli,
+            ["enable-fts", db_path, "Gosh", "c1", "--fts4", "--create-triggers"],
+        )
+        .exit_code
+    )
+    assert 0 == exit_code
+
+    def search(q):
+        return (
+            Database(db_path)
+            .conn.execute("select c1 from Gosh_fts where c1 match ?", [q])
+            .fetchall()
+        )
+
+    assert [("baz",)] == search("baz")
+    Database(db_path)["Gosh"].insert_all([{"c1": "martha"}])
+    assert [("martha",)] == search("martha")
+
 
 def test_populate_fts(db_path):
     Database(db_path)["Gosh"].insert_all([{"c1": "baz"}])