Add BLIGHT:: document-scope triggers and case-insensitive matching

- Split TRIGGER_PATTERN into INLINE_PATTERN (BLIGHT:) and DOCUMENT_PATTERN
  (BLIGHT::), both case-insensitive
- Inline triggers replace only the trigger line (existing behaviour)
- Document-scope triggers replace the entire file; multiple BLIGHT:: triggers
  in one file are processed sequentially, each seeing the previous result
- Updated FAILED_TEMPLATE to two-line format with BLIGHT_FAILED and BLIGHT_ERROR
- Added complete_document() to AIProvider ABC and GeminiProvider with a
  dedicated system prompt instructing the model to return the full document

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

ai/base.py

@@ -4,13 +4,14 @@ from abc import ABC, abstractmethod
 class AIProvider(ABC):
     """Base class for all AI provider implementations.
 
-    To add a new provider, subclass this and implement `complete`, then
-    instantiate your provider in `processor.py` instead of GeminiProvider.
+    To add a new provider, subclass this and implement `complete` and
+    `complete_document`, then instantiate your provider in `processor.py`
+    instead of GeminiProvider.
     """
 
     @abstractmethod
     def complete(self, document: str, instruction: str) -> str:
-        """Process an instruction in the context of a full document.
+        """Process an inline instruction in the context of a full document.
 
         Args:
             document: The full markdown document text (for context).
@@ -19,3 +20,15 @@ class AIProvider(ABC):
         Returns:
             The text to insert in place of the trigger line.
         """
+
+    @abstractmethod
+    def complete_document(self, document: str, instruction: str) -> str:
+        """Apply a document-scope instruction and return the full rewritten document.
+
+        Args:
+            document: The full markdown document text.
+            instruction: The BLIGHT:: instruction extracted from the trigger line.
+
+        Returns:
+            The full rewritten document as a string.
+        """

ai/gemini.py

@@ -2,7 +2,7 @@ import google.generativeai as genai
 import config
 from .base import AIProvider
 
-_SYSTEM_PROMPT = (
+_INLINE_SYSTEM_PROMPT = (
     "You are an inline document assistant. "
     "The user will provide a markdown document and a specific instruction. "
     "Your response must contain ONLY the text to be inserted into the document — "
@@ -11,13 +11,26 @@ _SYSTEM_PROMPT = (
     "Respond as if your output will be dropped directly into the middle of a document."
 )
 
+_DOCUMENT_SYSTEM_PROMPT = (
+    "You are a document editing assistant. "
+    "The user will provide a markdown document and a specific instruction. "
+    "Apply the instruction to the entire document and return the full rewritten document. "
+    "Your response must contain ONLY the rewritten document — "
+    "no preamble, no explanation, no meta-commentary, no markdown code fences. "
+    "Preserve the document's structure and formatting unless the instruction says otherwise."
+)
+
 
 class GeminiProvider(AIProvider):
     def __init__(self) -> None:
         genai.configure(api_key=config.GEMINI_API_KEY)
-        self._model = genai.GenerativeModel(
+        self._inline_model = genai.GenerativeModel(
             model_name="gemini-2.5-flash-lite",
-            system_instruction=_SYSTEM_PROMPT,
+            system_instruction=_INLINE_SYSTEM_PROMPT,
+        )
+        self._document_model = genai.GenerativeModel(
+            model_name="gemini-2.5-flash-lite",
+            system_instruction=_DOCUMENT_SYSTEM_PROMPT,
         )
 
     def complete(self, document: str, instruction: str) -> str:
@@ -25,5 +38,13 @@ class GeminiProvider(AIProvider):
             f"DOCUMENT:\n\n{document}\n\n"
             f"INSTRUCTION: {instruction}"
         )
-        response = self._model.generate_content(prompt)
+        response = self._inline_model.generate_content(prompt)
+        return response.text.strip()
+
+    def complete_document(self, document: str, instruction: str) -> str:
+        prompt = (
+            f"DOCUMENT:\n\n{document}\n\n"
+            f"INSTRUCTION: {instruction}"
+        )
+        response = self._document_model.generate_content(prompt)
         return response.text.strip()

processor.py

@@ -5,8 +5,12 @@ from ai import GeminiProvider
 
 logger = logging.getLogger(__name__)
 
-TRIGGER_PATTERN = re.compile(r"^BLIGHT:\s+(.+)$", re.MULTILINE)
-FAILED_TEMPLATE = "<!-- BLIGHT_FAILED: {instruction} -->"
+# Inline trigger: BLIGHT: <instruction>  (single colon, case-insensitive)
+INLINE_PATTERN = re.compile(r"^BLIGHT:(?!:)\s+(.+)$", re.MULTILINE | re.IGNORECASE)
+# Document-scope trigger: BLIGHT:: <instruction>  (double colon, case-insensitive)
+DOCUMENT_PATTERN = re.compile(r"^BLIGHT::\s+(.+)$", re.MULTILINE | re.IGNORECASE)
+
+FAILED_TEMPLATE = "<!-- BLIGHT_FAILED: {instruction} -->\n<!-- BLIGHT_ERROR: {error} -->"
 
 _MAX_RETRIES = 3
 _RETRY_DELAYS = [1, 2, 4]  # seconds between attempts
@@ -17,42 +21,80 @@ _provider = GeminiProvider()
 def process_document(content: str) -> tuple[str, bool]:
     """Scan content for BLIGHT triggers and process each one.
 
+    Inline triggers (BLIGHT:) are processed first in document order, each
+    replacing only the trigger line. Document-scope triggers (BLIGHT::) are
+    processed next in document order, each replacing the entire file content
+    and operating on the result of the previous.
+
     Returns:
         (updated_content, changed) where changed is True if any triggers
         were found and the content was modified.
     """
-    triggers = list(TRIGGER_PATTERN.finditer(content))
-    if not triggers:
+    has_inline = bool(INLINE_PATTERN.search(content))
+    has_document = bool(DOCUMENT_PATTERN.search(content))
+    if not has_inline and not has_document:
         return content, False
 
-    # Process triggers one by one. After each replacement the string length
-    # may change, so we re-search on the updated content each iteration.
     changed = False
-    for _ in range(len(triggers)):
-        match = TRIGGER_PATTERN.search(content)
+
+    # --- Pass 1: inline triggers ---
+    # Re-search after each replacement since string length may change.
+    inline_count = len(INLINE_PATTERN.findall(content))
+    for _ in range(inline_count):
+        match = INLINE_PATTERN.search(content)
         if not match:
             break
 
         instruction = match.group(1).strip()
-        trigger_line = match.group(0)
-        logger.info("Processing trigger: %s", instruction)
+        logger.info("Processing inline trigger: %s", instruction)
 
-        replacement = _call_with_retry(content, instruction)
+        replacement = _call_with_retry(content, instruction, document_scope=False)
         content = content[:match.start()] + replacement + content[match.end():]
         changed = True
 
+    # --- Pass 2: document-scope triggers ---
+    # Each trigger operates on the result of the previous.
+    doc_count = len(DOCUMENT_PATTERN.findall(content))
+    for _ in range(doc_count):
+        match = DOCUMENT_PATTERN.search(content)
+        if not match:
+            break
+
+        instruction = match.group(1).strip()
+        logger.info("Processing document-scope trigger: %s", instruction)
+
+        # Remove the trigger line before passing to AI so it doesn't appear
+        # in the rewritten document. Also consume the trailing newline that
+        # follows the trigger line, if present.
+        trigger_start, trigger_end = match.start(), match.end()
+        if trigger_end < len(content) and content[trigger_end] == "\n":
+            trigger_end += 1
+        content_without_trigger = content[:trigger_start] + content[trigger_end:]
+
+        result = _call_with_retry(content_without_trigger, instruction, document_scope=True)
+
+        if result.startswith("<!-- BLIGHT_FAILED:"):
+            # On failure, restore the trigger line and insert the failure comment.
+            content = content[:trigger_start] + result + content[trigger_end:]
+        else:
+            content = result
+
+        changed = True
+
     return content, changed
 
 
-def _call_with_retry(document: str, instruction: str) -> str:
+def _call_with_retry(document: str, instruction: str, *, document_scope: bool) -> str:
     """Call the AI provider with up to _MAX_RETRIES attempts.
 
-    Returns the AI response on success, or a BLIGHT_FAILED comment on
-    exhausted retries.
+    Returns the AI response on success, or BLIGHT_FAILED/BLIGHT_ERROR comments
+    on exhausted retries.
     """
     last_error: Exception | None = None
     for attempt in range(_MAX_RETRIES):
         try:
+            if document_scope:
+                return _provider.complete_document(document, instruction)
             return _provider.complete(document, instruction)
         except Exception as exc:
             last_error = exc
@@ -74,4 +116,4 @@ def _call_with_retry(document: str, instruction: str) -> str:
         instruction,
         last_error,
     )
-    return FAILED_TEMPLATE.format(instruction=instruction)
+    return FAILED_TEMPLATE.format(instruction=instruction, error=last_error)