feat(fastapi): add configurable commit hash display

Two new options have been added:

- [devel] commit_url
    - URL including an %s format specifier that can be used to link
      to a webpage for the commit.
- [devel] commit_hash
    - HEAD's commit hash (produced via `git rev-parse HEAD`)

If a `[devel] commit_hash` is configured, a link to the commit based on
`[devel] commit_url` will be displayed in the aurweb footer in
the form: `HEAD@<commit_hash>`. If no `[devel] commit_url` is
configured, a non-linked hash will be displayed.

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

aurweb/templates.py

@@ -88,9 +88,17 @@ def register_function(name: str) -> Callable:
 def make_context(request: Request, title: str, next: str = None):
     """ Create a context for a jinja2 TemplateResponse. """
 
+    commit_url = aurweb.config.get_with_fallback("devel", "commit_url", None)
+    commit_hash = aurweb.config.get_with_fallback("devel", "commit_hash", None)
+    if commit_hash:
+        # Shorten commit_hash to a short Git hash.
+        commit_hash = commit_hash[:7]
+
     timezone = time.get_request_timezone(request)
     return {
         "request": request,
+        "commit_url": commit_url,
+        "commit_hash": commit_hash,
         "language": l10n.get_request_language(request),
         "languages": l10n.SUPPORTED_LANGUAGES,
         "timezone": timezone,

aurweb/testing/requests.py

@@ -20,9 +20,14 @@ class Client:
     host = "127.0.0.1"
 
 
+class URL:
+    path = "/"
+
+
 class Request:
     """ A fake Request object which mimics a FastAPI Request for tests. """
     client = Client()
     cookies = dict()
     headers = dict()
     user = User()
+    url = URL()