build.cmds.GetAuthInfo: Add module

Add command get-auth-info to jw-projects.py. It is meant to retrieve
JANWARE_USER from an already cloned jw-build tree.

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

src/python/jw/build/cmds/CmdGetAuthInfo.py

@@ -0,0 +1,38 @@
+# -*- coding: utf-8 -*-
+
+import re
+from argparse import Namespace, ArgumentParser
+from urllib.parse import urlparse
+
+from ..Cmd import Cmd
+from ..lib.util import run_cmd
+
+class CmdGetAuthInfo(Cmd): # export
+
+    def __init__(self) -> None:
+        super().__init__('get-auth-info', help='Try to retrieve authentication information from the source tree')
+
+    def add_arguments(self, parser: ArgumentParser) -> None:
+        super().add_arguments(parser)
+        parser.add_argument('--only-values', help='Don\'t prefix values by "<field-name>="', action='store_true', default=False)
+        parser.add_argument('--username', help='Show user name', action='store_true', default=False)
+        parser.add_argument('--password', help='Show password', action='store_true', default=False)
+
+    def _run(self, args: Namespace) -> None:
+        remotes = run_cmd(['git', '-C', self.app.proj_dir('jw-build'), 'remote', '-v'])
+        result: dict[str, str] = {}
+        keys = ['username', 'password']
+        for line in remotes.split('\n'):
+            if re.match(r'^\s*$', line):
+                continue
+            name, url, typ = re.split(r'\s+', line)
+            if name == 'origin' and typ == '(push)':
+                parsed = urlparse(url)
+                for key in keys:
+                    result[key] = getattr(parsed, key)
+                break
+        for key in keys:
+            if key in result and getattr(args, key, None):
+                if not args.only_values:
+                    print(f'{key}=', end='')
+                print(result[key])