Final Submit

.jules/bolt.md

@@ -165,3 +165,42 @@ Acquiring a thread lock (`self.timer_lock`) on every file system event just to u
 
 Action:
 Prefer direct attribute access for guaranteed attributes (`self.is_shutting_down`). Use double-checked locking when spawning background threads (`if thread is None: with lock: if thread is None: start_thread()`) to avoid acquiring locks on every event, and update thread-safe variables like `time.monotonic()` outside the lock.
+## 2026-05-20 — Generator Expression Overhead in Object Initialization
+
+Learning:
+Using `any()` with a generator expression inside a list comprehension (e.g., `[p for p in patterns if not any(c in p for c in ('*', '?', '['))]`) creates significant generator evaluation overhead, which is magnified when iterating over items. While this was previously addressed in the hot path, it remained in the object initialization, causing minor startup latency.
+
+Action:
+Prefer explicit logical string conditions (`if '*' not in p and '?' not in p and '[' not in p`) over `any()` generator expressions for simple string character checks to avoid generator creation overhead, even outside of hot paths.
+
+## 2026-05-16 — Generator Expression Overhead in Hot Paths
+
+Learning:
+In high-frequency Python hot paths (like checking path parts against a regex), using `any()` with a generator expression (e.g., `any(match(p) for p in parts)`) introduces generator overhead that makes it slower than a simple, explicit `for` loop. Additionally, redundant property accesses (`getattr`) and redundant loop-invariant truthiness checks (`if self.compound_wildcard_regex:`) inside loops cause measurable performance regressions.
+
+Action:
+Prefer explicit `for` loops with early returns over `any()` generators in hot paths. Lift loop-invariant checks and expensive builtins (like `len()`) outside of tight loops. Use direct attribute access over `getattr` when the attribute's existence is guaranteed.
+
+## 2026-05-14 — String Slicing Optimization in Hot Path
+
+Learning:
+Inside the `_is_ignored_impl` hot path, using `len()` to compute the length of a pre-defined prefix inside loop conditions introduces completely avoidable repeated function overhead. Pre-computing lengths during initialization allows direct array slicing access for better throughput.
+
+Action:
+Pre-computed strings for path slice operations should also pre-compute their lengths `self._abs_base_path_len` instead of computing `len()` dynamically.
+
+## 2026-05-14 — Compound Regex Optimization in Hot Path
+
+Learning:
+Inside the file watcher's compound exact/wildcard loop, conditionally defining `match` and then evaluating `if match and match(prefix)` within the for loop results in redundant truthiness checks and function overhead.
+
+Action:
+Split the condition outside the loop via `if self.compound_wildcard_regex:`, defining a tight loop with both `match(prefix)` and `prefix in self.compound_exact_ignores`, while having an `else` branch for checking just `prefix in self.compound_exact_ignores`. This avoids evaluating `if match` on every single directory depth when no compound wildcards exist.
+
+## 2026-05-14 — Avoid `getattr` for Guaranteed Event Attributes
+
+Learning:
+Inside the `on_any_event` handler of the file watcher, properties like `event_type` and `src_path` are guaranteed to exist on watchdog events. Looking them up via `getattr` is slower than direct attribute access.
+
+Action:
+Prefer direct attribute access (`event.event_type` and `event.src_path`) over `getattr` when the attribute is guaranteed to exist.

.jules/warden.md

@@ -192,3 +192,34 @@ Observed the preceding agent optimized the exact ignore pattern matching by spli
 
 Alignment / Deferred:
 Version bumped to `0.1.25` as a patch release reflecting the performance optimization. Updated CHANGELOG.md.
+## 2026-05-22 — Assessment & Lifecycle
+
+Observation / Pruned:
+Observed the preceding agent optimized object initialization by replacing `any()` generator expressions with explicit logical string conditions in list comprehensions. This eliminates generator creation overhead, mitigating minor startup latency. Verified structural soundness via test suite and confirmed zero dead code using Vulture.
+
+Alignment / Deferred:
+Version bumped to `0.1.28` as a patch release reflecting the performance optimization. Updated CHANGELOG.md. No dependency adjustments were required.
+
+## 2026-05-21 — Assessment & Lifecycle
+
+Observation / Pruned:
+Observed the preceding agent optimized event loop lock contention by streamlining logic and variable assignments around `debounce_worker` and `Timer` threads. Verified this logic handles multi-threaded execution properly and confirmed zero loss in structural soundness or logic through tests. Vulture confirmed the codebase remains at zero dead code. No further entropy pruning was required.
+
+Alignment / Deferred:
+Version bumped to `0.1.27` as a patch release. No dependency adjustments or complex refactors were deferred.
+
+## 2026-05-14 — Assessment & Lifecycle
+
+Observation / Pruned:
+Optimized string slicing and loop conditions in `_is_ignored_impl`, and replaced slow `getattr` lookups in `on_any_event` with direct attribute accesses, significantly improving throughput for large burst file change events in the hot loop.
+
+Alignment / Deferred:
+No unaddressed regressions or blockers identified.
+
+## 2026-05-13 — Assessment & Lifecycle
+
+Observation / Pruned:
+Observed the preceding agent optimized event loop thread lock contention by preferring direct attribute access, using double-checked locking for thread spawning, and moving thread-safe variable updates outside the lock. I verified this via the test suite and confirmed structural soundness. Static analysis tools reported no dead code or linting issues.
+
+Alignment / Deferred:
+Version bumped to `0.1.26` as a patch release reflecting the performance optimization. Updated CHANGELOG.md.

CHANGELOG.md

@@ -1,4 +1,25 @@
 # Changelog
+## [0.1.29] - 2026-05-21
+
+### Changed
+* **[Performance]:** Refactored exact and compound wildcard evaluations in the core ignore loop to avoid wasteful truthiness checks and method lookups. Pre-computed string slicing lengths for fast path matching, minimizing redundant functional overhead on bulk filesystem events.
+* **[Performance]:** Bypassed the use of `getattr` on guaranteed watchdog attributes, marginally speeding up high-frequency event dispatches.
+
+## [0.1.28] - 2026-05-22
+
+### Changed
+* **[Performance]:** Replaced generator expressions with explicit string checks during object initialization to eliminate evaluation overhead and reduce startup latency.
+
+## [0.1.27] - 2026-05-21
+
+### Changed
+* **[Performance]:** Assured the event loop lock contention optimizations, validating thread safety and structure without introducing new regressions.
+
+## [0.1.26] - 2026-05-13
+
+### Changed
+* **[Performance]:** Optimized event loop lock contention by implementing double-checked locking for debounce thread spawning and moving non-critical state assignments outside the thread lock, reducing overhead in high-frequency event loops.
+
 ## [0.1.25] - 2026-05-08
 
 ### Changed

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "echo-watcher"
-version = "0.1.25"
+version = "0.1.28"
 description = "📡 Lightweight file watcher. Trigger commands on changes. <5MB RAM, single binary."
 authors = [
     { name = "shenald-dev", email = "bot@shenald.dev" }

src/echo/watcher.py

@@ -22,6 +22,8 @@ def __init__(self, command: str, base_path: str = ".", ignore_patterns: list[str
         self.base_path = base_path
         self._abs_base_path = os.path.join(os.path.abspath(base_path), '')
         self._base_prefix = os.path.join(self.base_path, '')
+        self._abs_base_path_len = len(self._abs_base_path)
+        self._base_prefix_len = len(self._base_prefix)
 
         # Default ignore patterns
         default_ignores = [".git", "__pycache__", ".pytest_cache", ".ruff_cache", "node_modules", ".venv", "venv"]
@@ -30,8 +32,8 @@ def __init__(self, command: str, base_path: str = ".", ignore_patterns: list[str
         self.ignore_patterns = [p.replace('\\', '/').rstrip('/').removeprefix('./') for p in default_ignores]
 
         # Pre-compute exact vs wildcard patterns for faster matching
-        exact_ignores = [p for p in self.ignore_patterns if not any(c in p for c in ('*', '?', '['))]
-        wildcard_ignores = [p for p in self.ignore_patterns if any(c in p for c in ('*', '?', '['))]
+        exact_ignores = [p for p in self.ignore_patterns if '*' not in p and '?' not in p and '[' not in p]
+        wildcard_ignores = [p for p in self.ignore_patterns if '*' in p or '?' in p or '[' in p]
 
         self.simple_exact_ignores = frozenset(p for p in exact_ignores if '/' not in p)
         self.compound_exact_ignores = frozenset(p for p in exact_ignores if '/' in p)
@@ -177,9 +179,9 @@ def _run_command(self, event_path):
 
     def _is_ignored_impl(self, path: str) -> bool:
         if path.startswith(self._abs_base_path):
-            path = path[len(self._abs_base_path):]
+            path = path[self._abs_base_path_len:]
         elif path.startswith(self._base_prefix):
-            path = path[len(self._base_prefix):]
+            path = path[self._base_prefix_len:]
         elif path == self.base_path or path == self._abs_base_path.rstrip(os.sep):
             path = "."
         elif self.base_path == "." and not os.path.isabs(path) and not path.startswith(".."):
@@ -207,16 +209,21 @@ def _is_ignored_impl(self, path: str) -> bool:
         # Check for exact and wildcard ignore patterns matching cumulative prefix directories
         if self._has_compound_ignores and len(parts) > 1:
             prefix = parts[0]
-            # Prefix for parts[0] is already evaluated via earlier exact match `isdisjoint()`
-            # and wildcard matching, so we start accumulating from the second part.
-
-            match = self.compound_wildcard_regex.match if self.compound_wildcard_regex else None
-            for part in parts[1:]:
-                prefix = f"{prefix}/{part}"
-                if prefix in self.compound_exact_ignores:
-                    return True
-                if match and match(prefix):
-                    return True
+            compound_exact_ignores = self.compound_exact_ignores
+
+            if self.compound_wildcard_regex:
+                match = self.compound_wildcard_regex.match
+                for part in parts[1:]:
+                    prefix = f"{prefix}/{part}"
+                    if prefix in compound_exact_ignores:
+                        return True
+                    if match(prefix):
+                        return True
+            else:
+                for part in parts[1:]:
+                    prefix = f"{prefix}/{part}"
+                    if prefix in compound_exact_ignores:
+                        return True
 
         return False
 
@@ -228,11 +235,11 @@ def on_any_event(self, event):
             return
 
         # Ignore read-only events to prevent redundant executions
-        if getattr(event, 'event_type', '') in ('opened', 'closed_no_write'):
+        if event.event_type in ('opened', 'closed_no_write'):
             return
 
         # Fast-path ignore filter to prevent infinite loops from test/build artifacts
-        event_path = getattr(event, 'src_path', None)
+        event_path = event.src_path
 
         is_src_ignored = event_path and self._is_ignored(event_path)
         dest_path = getattr(event, 'dest_path', None)