cmds.projects.CmdPythonpath: Opts subdir, delimiter, prefix

Support additional options:
  --subdir    makes the command look for these existing
              subdirectories. Can be specified multiple times.
--delimiter Does the obvious and defaults to ":"
--prefix    A string to prepend verbatim before each path component
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/cmds/projects/CmdPythonpath.py

@@ -1,8 +1,9 @@
 from __future__ import annotations
 
+from typing import TYPE_CHECKING
+
 from ...App import Scope
 from .Cmd import Cmd, Parent
-from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
     from argparse import ArgumentParser, Namespace
@@ -16,6 +17,25 @@ class CmdPythonpath(Cmd):  # export
 
     def add_arguments(self, parser: ArgumentParser) -> None:
         super().add_arguments(parser)
+        parser.add_argument(
+            '--subdir',
+            action = 'append',
+            help = (
+                'Directories to look for relative to the '
+                'respective project root directory'
+            ),
+            default = ['src/python', 'tools/python'],
+        )
+        parser.add_argument(
+            '--delimiter',
+            default = ':',
+            help = 'Delimiter between paths',
+        )
+        parser.add_argument(
+            '--prefix',
+            help = 'Prefix to prepend before every path component',
+            dest = 'path_component_prefix',
+        )
         parser.add_argument('module', help = 'Modules', nargs = '*')
 
     async def _run(self, args: Namespace) -> None:
@@ -29,8 +49,10 @@ class CmdPythonpath(Cmd):  # export
         )
         out = []
         for m in deps:
-            path = self.app.find_dir(m, ['src/python', 'tools/python'])
+            path = self.app.find_dir(m, args.subdir)
             if path is not None:
+                if args.path_component_prefix is not None:
+                    path = f'{args.path_component_prefix}{path}'
                 out.append(path)
         if out:
-            print(':'.join(out))
+            print(args.delimiter.join(out))