cmds.distro.lib.Package: Add more methods

Add more methods, to make Package more useful:

  - __repr__()

  - Class-mMethods to help with parsing of strings gathered from the
    OS-tools' output:

      parse_spec_str()
      parse_specs_str()
      order_tags()

  - Add field maintainer

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

src/python/jw/pkg/cmds/distro/lib/Package.py

@@ -1,14 +1,51 @@
 # -*- coding: utf-8 -*-
 
+from typing import Any
+
+meta_tags = [
+    "name",
+    "vendor",
+    "packager",
+    "url",
+    "maintainer",
+]
+
 class Package:
 
     name: str = None
     vendor: str|None = None
     packager: str|None = None
     url: str|None = None
+    maintainer: str|None = None
 
-    def __init__(self, name: str, vendor: str|None=None, packager: str|None=None, url: str|None=None):
+    @classmethod
+    def parse_spec_str(cls, spec: str, delimiter='|'):
+        tags = spec.split(delimiter)
+        if len(tags) != 5:
+            raise ValueError(f'Invalid package spec string \"{spec}\"')
+        return cls(name=tags[0], vendor=tags[1], packager=tags[2], url=tags[3], maintainer=tags[4])
+
+    @classmethod
+    def parse_specs_str(cls, specs: str, delimiter='|'):
+        ret: list[Package] = []
+        for spec in specs.splitlines():
+            ret.append(cls.parse_spec_str(spec))
+        return ret
+
+    @classmethod
+    def order_tags(cls, mapping: dict[str, Any]):
+        ret: dict[str, Any] = {}
+        for tag in meta_tags:
+            ret[tag] = mapping.get(tag, '')
+        return ret
+
+    def __init__(self, name: str, vendor: str|None=None, packager: str|None=None, url: str|None=None, maintainer: str|None=None):
         self.name = name
         self.vendor = vendor
         self.packager = packager
         self.url = url
+        self.maintainer = maintainer
+
+    def __repr__(self) -> str:
+        global meta_tags
+        return '\n'.join([f'{key:<15}: {getattr(self, key)}' for key in meta_tags])