Refactor process title handling in RotaBuilder for improved clarity and functionality

gen_proc.py

@@ -70,7 +70,7 @@ def main(
     Rota.constraint_options["max_weekend_frequency"] = 3
     Rota.constraint_options["hard_constrain_pair_separation"] = True
 
-    Rota.constraint_options["max_days_per_week_block"] = [(5, 2), (6, 3), (8,4)]
+    Rota.constraint_options["max_days_per_week_block"] = [(8,4)]
 
     #wr = [
     #    WorkerRequirement(

rota_generator/shifts.py

@@ -38,6 +38,49 @@ from loguru import logger
 
 logger.add("rota.log", rotation="1 MB", level="DEBUG")
 
+import ctypes
+import platform
+
+# Optional dependency: prefer setproctitle if available, fall back to libc on macOS
+try:
+    import setproctitle  # type: ignore
+except Exception:
+    setproctitle = None
+
+
+def _get_proc_title() -> Optional[str]:
+    try:
+        if setproctitle is not None:
+            return setproctitle.getproctitle()
+        if platform.system() == "Darwin":
+            libc = ctypes.CDLL("libc.dylib")
+            libc.getprogname.restype = ctypes.c_char_p
+            res = libc.getprogname()
+            if res:
+                return res.decode()
+    except Exception:
+        logger.debug("Could not read current process title")
+    return None
+
+
+def _set_proc_title(title: str) -> bool:
+    try:
+        if setproctitle is not None:
+            setproctitle.setproctitle(title)
+            return True
+        if platform.system() == "Darwin":
+            libc = ctypes.CDLL("libc.dylib")
+            # setprogname expects a C string
+            try:
+                libc.setprogname(ctypes.c_char_p(title.encode()))
+                return True
+            except Exception:
+                # some platforms may not support setprogname via ctypes
+                pass
+    except Exception:
+        logger.debug("Failed to set process title to %s", title)
+    return False
+
 
 def _safe_constraint_info(obj):
     """Return a tuple (type_name, safe_dump) for logging without calling repr()
@@ -618,10 +661,17 @@ class RotaBuilder(object):
         allow_force_assignment_with_leave_conflict: bool = False,
         SHIFT_BOUNDS=SHIFT_BOUNDS,
         name: str = "",
+        set_process_title: bool = True,
         bank_holidays: dict[datetime.date, str] = bank_holiday_map,
         constraint_options: RotaConstraintOptions | dict | None = None,
     ):
         self.name = name
+        self.set_process_title = set_process_title
+        # record original process title so we can restore it after the run
+        try:
+            self._original_proc_title = _get_proc_title()
+        except Exception:
+            self._original_proc_title = None
 
         console.print(
             Panel(
@@ -909,6 +959,17 @@ class RotaBuilder(object):
         export_with_timestamp=False,
         solver="appsi_highs",
     ):
+        # Optionally set an informative process title so OS tools show which rota is running
+        self._proc_title_changed = False
+        if getattr(self, "set_process_title", False):
+            title = f"rota-gen:{self.name}" if self.name else "rota-gen"
+            try:
+                if _set_proc_title(title):
+                    self._proc_title_changed = True
+                    logger.debug("Process title set to %s", title)
+            except Exception:
+                logger.debug("Could not set process title")
+
         self.run_start_time = datetime.datetime.now()
 
         self.build_shifts()
@@ -925,6 +986,17 @@ class RotaBuilder(object):
 
         self.run_end_time = datetime.datetime.now()
 
+        # Restore the original process title if we changed it
+        if getattr(self, "_proc_title_changed", False):
+            try:
+                if getattr(self, "_original_proc_title", None) is not None:
+                    _set_proc_title(self._original_proc_title)
+                else:
+                    # best-effort restore to a generic python name
+                    _set_proc_title("python")
+            except Exception:
+                logger.debug("Could not restore original process title")
+
         if export:
             self.export_rota_to_html(self.name, timestamp_filename=export_with_timestamp)