lib.log.log(): Convert string-based flags to Flag

Replace the set of flag strings with a Flag enum for better type
safety and bitwise operations. Add parse_flags() to convert
comma-separated strings into a LogFlag value. Update set_flags() and
set_log_flags() to accept str | LogFlag | None.

set_flags() and set_log_flags() don't return str anylonger which is a
breaking change, but shouldn't be a problem because it's not used
anywhere.

Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/log.py

@@ -5,9 +5,11 @@ import re
 import sys
 import syslog
 
+from enum import Flag, auto
+
 from datetime import datetime
 from os.path import basename
-from typing import TYPE_CHECKING, cast
+from typing import TYPE_CHECKING, cast, override
 
 if TYPE_CHECKING:
     import io
@@ -81,16 +83,44 @@ CONSOLE_FONT_WHITE   = '\033[37m'
 CONSOLE_FONT_BLINK   = '\033[5m'
 CONSOLE_FONT_OFF     = '\033[m'
 
-f_position           = 'position'
-f_module             = 'module'
-f_date               = 'date'
-f_stderr             = 'stderr'
-f_stdout             = 'stdout'
-f_prio               = 'prio'
-f_color              = 'color'
-f_default            = [ f_position, f_stderr, f_prio, f_color ]
+# -- ytools compatible log flags
+#syslog
+#console
+#color
+#prio
+#position
+#ide
+#trace_rename_thread_to_shorter
+#trace_rename_thread_to_longer
+#trace_inout
+#skip_openlog
+#id
+#date
+#pid
+#highlight_first_error
+
+class LogFlag(Flag):
+    POSITION = auto()
+    MODULE = auto()
+    DATE = auto()
+    STDERR = auto()
+    STDOUT = auto()
+    PRIO = auto()
+    COLOR = auto()
+
+    @override
+    def __str__(self) -> str:
+        def _get_name(f: LogFlag) -> str:
+            return f.name or ''
+
+        return ','.join(
+            f.name.lower()
+            for f in sorted(self, key = _get_name)
+            if f.name
+        )
+
+_flags = LogFlag.POSITION | LogFlag.STDERR | LogFlag.PRIO | LogFlag.COLOR
 
-_flags               = set(f_default)
 _log_prefix          = ''
 _clean_log_prefix    = ''
 _file_name_len       = 20
@@ -206,25 +236,25 @@ def log(  # export
     color_on = ''
     color_off = ''
 
-    if f_date in _flags:
+    if LogFlag.DATE & _flags:
         msg += datetime.now().strftime("%b %d %H:%M:%S.%f") + ' '
 
-    if f_prio in _flags:
+    if LogFlag.PRIO & _flags:
         msg += _short_prio_str[prio] + ' '
 
-    if f_position in _flags:
+    if LogFlag.POSITION & _flags:
 
         if 'caller' in kwargs:
             mod, name, line = kwargs['caller']
         else:
             mod, name, line = get_caller_pos(1)
 
-        if f_module in _flags:
+        if LogFlag.MODULE & _flags:
             msg += pad(mod, _module_name_len)
 
         msg += pad(name, _file_name_len) + '[' + pad(str(line), 4, True) + ']'
 
-    if f_color in _flags:
+    if LogFlag.COLOR & _flags:
         color_on, color_off = console_color_chars(prio)
 
     margs = ''
@@ -255,10 +285,10 @@ def log(  # export
     elif _streams:
         files = [s.stream for s in _streams.values()]
     else:
-        if f_stdout in _flags:
+        if LogFlag.STDOUT & _flags:
             files.append(sys.stdout)
 
-        if f_stderr in _flags:
+        if LogFlag.STDERR & _flags:
             files.append(sys.stderr)
 
         if not len(files):
@@ -310,30 +340,27 @@ def set_log_level(level: str | int | None = None) -> int:
 def set_level(level: str | int | None = None) -> int:  # export
     return set_log_level(level)
 
-def set_flags(flags: str | None) -> str:  # export
-    global _flags
-    ret = ','.join(_flags)
-    if flags is not None:
-        _flags = set(flags.split(','))
+def parse_flags(flags: str) -> LogFlag:
+    ret: LogFlag = LogFlag(0)
+    s = set(flags.split(','))
+    for f in LogFlag:
+        assert f.name is not None
+        if f.name.lower() in s:
+            ret |= f
     return ret
 
-def set_log_flags(flags: str) -> str:
-    return set_flags(flags)
+parse_log_flags = parse_flags
 
-    #syslog
-    #console
-    #color
-    #prio
-    #position
-    #ide
-    #trace_rename_thread_to_shorter
-    #trace_rename_thread_to_longer
-    #trace_inout
-    #skip_openlog
-    #id
-    #date
-    #pid
-    #highlight_first_error
+def set_flags(flags: str | LogFlag | None) -> LogFlag:  # export
+    global _flags
+    if isinstance(flags, str):
+        flags = parse_flags(flags)
+    ret = _flags
+    if flags is not None:
+        _flags = flags
+    return ret
+
+set_log_flags = set_flags
 
 def append_to_prefix(prefix: str) -> str:  # export
     global _log_prefix