macOS support

Service.py

@@ -2,19 +2,21 @@
 and its logs. SaraSortd's own log files are read from its LogDir.
 
 Linux with systemd: its systemd user unit (systemctl / journalctl).
-Windows, and Linux without systemd (runit, OpenRC, s6, ...): SaraSuite runs
+Windows, macOS, and Linux without systemd (runit, OpenRC, s6, ...): SaraSuite runs
 it itself (its Services.py), and this does the same:
 - it runs as `python ServiceRun.py SaraSortd SaraSortd.py <ConfigDir>`
   (pythonw.exe on Windows); ServiceRun.py restarts it if it fails, keeps its
   output in SaraSuite's Services folder as SaraSortd.log (the "Service log"
   here) and records its PID in SaraSortd.pid (that's how "running" is told);
-- autostart is a shortcut to that command in the Startup folder (Windows)
-  or an XDG autostart entry, ~/.config/autostart/SaraSortd.desktop (Linux).
+- autostart is a shortcut to that command in the Startup folder (Windows),
+  a LaunchAgent, ~/Library/LaunchAgents/srhtnin.SaraSortd.plist (macOS), or
+  an XDG autostart entry, ~/.config/autostart/SaraSortd.desktop (Linux).
 Unit is the systemd unit name ("SaraSortd.service"); run by SaraSuite, the
 service is called the same without ".service".
 """
 
 import os
+import plistlib
 import re
 import signal
 import subprocess
@@ -23,7 +25,7 @@ from dataclasses import dataclass
 from datetime import datetime
 from pathlib import Path
 
-from Core import AutostartDir, ChildEnvironment, ConfigHome, DataHome, IsWindows, LoadConfig, RunBySaraSuite
+from Core import AutostartDir, ChildEnvironment, ConfigHome, DataHome, Home, IsMac, IsWindows, LoadConfig, RunBySaraSuite
 
 
 @dataclass
@@ -48,7 +50,7 @@ def _Run(Arguments: list[str], Timeout: int = 15) -> subprocess.CompletedProcess
                           creationflags=_NoWindow)
 
 
-# --- Run by SaraSuite (Windows; Linux without systemd) ------------------------------------------
+# --- Run by SaraSuite (Windows; macOS; Linux without systemd) ------------------------------------------
 
 
 def _Name(Unit: str) -> str:
@@ -62,6 +64,8 @@ def _ServicesFile(Name: str, Suffix: str) -> Path:
 def _AutostartFile(Name: str) -> Path:
     if IsWindows:
         return ConfigHome / "Microsoft" / "Windows" / "Start Menu" / "Programs" / "Startup" / f"{Name}.lnk"
+    if IsMac:
+        return Home / "Library" / "LaunchAgents" / f"srhtnin.{Name}.plist"
     return AutostartDir / f"{Name}.desktop"
 
 
@@ -85,6 +89,11 @@ def _Pid(Name: str) -> str:
         Pid = int(_ServicesFile(Name, ".pid").read_text().strip())
     except (OSError, ValueError):
         return ""
+    if IsMac:  # no /proc: ask ps for its command line
+        try:
+            return str(Pid) if "ServiceRun.py" in _Run(["ps", "-o", "command=", "-p", str(Pid)]).stdout else ""
+        except (OSError, subprocess.SubprocessError):
+            return ""
     if not IsWindows:
         try:
             return str(Pid) if b"ServiceRun.py" in Path(f"/proc/{Pid}/cmdline").read_bytes() else ""
@@ -134,6 +143,18 @@ def _AutostartEntry(Python: Path, Arguments: list[str], Name: str) -> str:
     )
 
 
+def _LaunchAgent(Python: Path, Arguments: list[str], Name: str, Folder: Path) -> bytes:
+    """The same LaunchAgent SaraSuite writes (its MacSupport.LaunchAgent)."""
+    return plistlib.dumps({
+        "Label": f"srhtnin.{Name}",
+        "ProgramArguments": [str(Python), *Arguments],
+        "WorkingDirectory": str(Folder),
+        "RunAtLoad": True,
+        "ProcessType": "Background",
+        "StandardErrorPath": str(Home / "Library" / "Logs" / f"{Name}.launchd.log"),
+    })
+
+
 def _OwnControl(Name: str, Action: str) -> str:
     Python, Arguments, Folder = _Command(Name)
     try:
@@ -169,6 +190,8 @@ def _OwnControl(Name: str, Action: str) -> str:
                 Quoted = " ".join(f'"{Item}"' if " " in Item or "\\" in Item else Item for Item in Arguments)
                 pylnk3.for_file(str(Python), str(Entry), arguments=Quoted, work_dir=str(Folder),
                                 description=f"{Name} (background service)")
+            elif IsMac:
+                Entry.write_bytes(_LaunchAgent(Python, Arguments, Name, Folder))
             else:
                 Entry.write_text(_AutostartEntry(Python, Arguments, Name))
         elif Action == "disable":