fix(routers.packages): handle package source display

Signed-off-by: Kevin Morris <kevr@0cost.org>

aurweb/packages/util.py

@@ -1,13 +1,13 @@
 from collections import defaultdict
 from http import HTTPStatus
-from typing import Dict, List, Union
+from typing import Dict, List, Tuple, Union
 
 import orjson
 
 from fastapi import HTTPException, Request
 from sqlalchemy import orm
 
-from aurweb import db, l10n, models, util
+from aurweb import config, db, l10n, models, util
 from aurweb.models import Package, PackageBase, User
 from aurweb.models.official_provider import OFFICIAL_BASE, OfficialProvider
 from aurweb.models.package_comaintainer import PackageComaintainer
@@ -382,3 +382,30 @@ def pkg_required(pkgname: str, provides: List[str], limit: int) \
         PackageDependency.DepName.in_(targets)
     ).order_by(Package.Name.asc()).limit(limit)
     return query.all()
+
+
+@register_filter("source_uri")
+def source_uri(pkgsrc: models.PackageSource) -> Tuple[str, str]:
+    """
+    Produce a (text, uri) tuple out of `pkgsrc`.
+
+    In this filter, we cover various cases:
+    1. If "::" is anywhere in the Source column, split the string,
+       which should produce a (text, uri), where text is before "::"
+       and uri is after "::".
+    2. Otherwise, if "://" is anywhere in the Source column, it's just
+       some sort of URI, which we'll return varbatim as both text and uri.
+    3. Otherwise, we'll return a path to the source file in a uri produced
+       out of options.source_file_uri formatted with the source file and
+       the package base name.
+
+    :param pkgsrc: PackageSource instance
+    :return (text, uri) tuple
+    """
+    if "::" in pkgsrc.Source:
+        return pkgsrc.Source.split("::", 1)
+    elif "://" in pkgsrc.Source:
+        return (pkgsrc.Source, pkgsrc.Source)
+    path = config.get("options", "source_file_uri")
+    pkgbasename = pkgsrc.Package.PackageBase.Name
+    return (pkgsrc.Source, path % (pkgsrc.Source, pkgbasename))