Fix snippet line range with start of line 1 (#2362)

Fixes #2361

docs/src/markdown/about/changelog.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## 10.8.1
+
+-   **FIX**: Snippets: Fix snippet line range with a start of line 1.
+
 ## 10.8
 
 -   **NEW**: Require Python Markdown 3.6+.

pymdownx/__meta__.py

@@ -185,5 +185,5 @@ def parse_version(ver, pre=False):
     return Version(major, minor, micro, release, pre, post, dev)
 
 
-__version_info__ = Version(10, 8, 0, "final")
+__version_info__ = Version(10, 8, 1, "final")
 __version__ = __version_info__._get_canonical()

pymdownx/snippets.py

@@ -292,7 +292,7 @@ def parse_snippets(self, lines, file_name=None, is_url=False):
                     end = int(ending[1:])
                 starting = m.group(2)
                 if starting and len(starting) > 1:
-                    start = max(1, int(starting[1:]) - 1)
+                    start = max(0, int(starting[1:]) - 1)
                 section_name = m.group(4)
                 if section_name:
                     section = section_name[1:]

tests/test_extensions/test_snippets.py

@@ -209,6 +209,33 @@ def test_start_line_inline(self):
             True
         )
 
+    def test_start_1_1(self):
+        """Test beginning of file, single line range."""
+
+        self.check_markdown(
+            R'''
+            ---8<--- "lines.txt:1:1"
+            ''',
+            '''
+            <p>This is a multi-line</p>
+            ''',
+            True
+        )
+
+    def test_start_1_2(self):
+        """Test beginning of file span of multiple lines."""
+
+        self.check_markdown(
+            R'''
+            ---8<--- "lines.txt:1:2"
+            ''',
+            '''
+            <p>This is a multi-line
+            snippet.</p>
+            ''',
+            True
+        )
+
     def test_end_line_inline(self):
         """Test ending line with inline syntax."""