feat: Make the start parameter to a semiliterate pattern optional

Resolves #4.

mkdocs.yml

@@ -12,7 +12,6 @@ plugins:
     include_extensions: [LICENSE]
     semiliterate:
       - pattern: '(\.md)$'
-        start: '^(.*\s*)'
         replace: [['^(.*)<!-- repo: -->.*<!-- site:(.*?) -->(.*\s*)$', '\1\2\3']]
       - pattern: '(\.py)$'
         start: '"""\smd'

mkdocs_semiliterate/plugin.py

@@ -49,6 +49,30 @@ it's the text **after** the application of any semiliterate `replace`ments that
 is checked for `{! ... !}`.
      """
 
+    def __init__(self, input_stream, output_stream, **kwargs):
+        """ md
+### Adjusted semiliterate options
+
+The `start` regular-expression parameter to a `semiliterate` file-inclusion
+pattern is now optional. If omitted, it means that extraction begins immediately
+with the first line of a file; in this case, `pause` and `terminate` retain
+their usual meanings, although there is not currently any way to resume from a
+`pause` when `start` is not specified. This adjustment to `semiliterate`
+parameters makes it easier to extract "front-matter" style documentation from
+files.
+        """
+        self.start_hot = False
+        if 'start' not in kwargs:
+            kwargs['start'] = 'dummy'
+            self.start_hot = True
+        super().__init__(input_stream, output_stream, **kwargs)
+
+    def extract(self):
+        if self.start_hot:
+            self.extracting = True
+            self.start = False
+        super().extract()
+
     include_open = re.compile(r'''(?<![`\\])(\{\!\s*)([\s'"])''')
     include_quoted_file = re.compile(
         r'''(['"])(?P<fn>.*?)\1\s+(?P<yml>[\s\S]*?)\s\!\}''')

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = mkdocs-semiliterate
-version = 0.0.5
+version = 0.0.7
 
 [options]
 packages = mkdocs_semiliterate