feat: hide revision selector on development guide

Author: Lancern

src/components/revision/RevisionSelector.astro

@@ -1,24 +1,11 @@
 ---
-import type { CxxRevision, Language } from "@src/types";
-import { getRevisions } from "@src/lib/revision";
+import type {  CxxRevision } from "@src/types";
 
-const pageRevision = Astro.locals.starlightRoute.entry.data.cppdoc?.revision;
-const since = pageRevision?.since as CxxRevision | undefined;
-const until = pageRevision?.until as CxxRevision | undefined;
-
-// This may look hacky, but we now infer whether the current page is for C or
-// C++ by examining the page's path in the file system.
-const path = Astro.locals.starlightRoute.entry.filePath;
-let language: Language;
-if (pageRevision?.lang) {
-  language = pageRevision.lang as Language;
-} else if (path.includes("src/content/docs/cpp/")) {
-  language = "C++";
-} else {
-  language = "C";
+interface Props {
+  revisions: CxxRevision[];
 }
 
-const revisions = getRevisions(language, { since, until });
+const { revisions } = Astro.props;
 ---
 
 <select id="revision-selector" class="revision-selector">

src/components/starlight/TableOfContents.astro

@@ -1,11 +1,35 @@
 ---
 import Default from "starlight-heading-badges/components/HeadingBadgesTableOfContents.astro";
-import RevisionSelector from "../revision/RevisionSelector.astro";
+import RevisionSelector from "@components/revision/RevisionSelector.astro";
+import type { CxxRevision, Language } from "@src/types";
+import { getRevisions } from "@src/lib/revision";
+
+const pageRevision = Astro.locals.starlightRoute.entry.data.cppdoc?.revision;
+const since = pageRevision?.since as CxxRevision | undefined;
+const until = pageRevision?.until as CxxRevision | undefined;
+
+// This may look hacky, but we now infer whether the current page is for C or
+// C++ by examining the page's path in the file system.
+const path = Astro.locals.starlightRoute.entry.filePath;
+let language: Language | undefined = undefined;
+if (pageRevision?.lang) {
+  language = pageRevision.lang as Language;
+} else if (path.includes("src/content/docs/cpp/")) {
+  language = "C++";
+} else if (path.includes("src/content/docs/c/")) {
+  language = "C";
+}
+
+const revisions = language && getRevisions(language, { since, until });
 ---
 
-<div class="toc-revision-selector">
-  <RevisionSelector />
-</div>
+{
+  revisions && revisions.length > 0 && (
+    <div class="toc-revision-selector">
+      <RevisionSelector revisions={revisions} />
+    </div>
+  )
+}
 
 <Default><slot /></Default>