Properly serve results from repositories that have no VCS metadata

e.g. "plain directory" repositories of the kind produced by
`zoekt-index` (as opposed to `zoekt-git-index`).

I simply had never tested support for these, and they of course lack
properties on the returned JSON objects that are otherwise present.
Tolerate certain properties being missing or null.

Fixes #30.

.changeset/happy-goats-pull.md

@@ -0,0 +1,5 @@
+---
+"neogrok": patch
+---
+
+Properly serve results from repositories that have no VCS metadata

src/lib/server/search-api.ts

@@ -108,13 +108,13 @@ const searchResultSchema = v.object({
               .object({
                 Repository: v.string(),
                 FileName: v.string(),
-                Branches: v.array(v.string()),
+                Branches: v.array(v.string()).optional(),
                 // Will be the empty string if zoekt couldn't figure it out, we
                 // call it Text for both display purposes and for parameterizing
                 // syntax highlighting; Text is the name zoekt will pick for
                 // plain text files it can identify.
                 Language: v.string().map((lang) => lang || "Text"),
-                Version: v.string(),
+                Version: v.string().optional(),
                 ChunkMatches: v.array(
                   v
                     .object({
@@ -166,7 +166,7 @@ const searchResultSchema = v.object({
                 ({
                   Repository: repository,
                   FileName: fileName,
-                  Branches: branches,
+                  Branches: branches = [],
                   Language: language,
                   Version: version,
                   ChunkMatches: chunkMatches,
@@ -241,9 +241,11 @@ const searchResultSchema = v.object({
               ),
               fileName,
               chunks,
-              fileUrl: repoUrls[repository]
-                ?.replaceAll("{{.Version}}", version)
-                .replaceAll("{{.Path}}", fileName.text),
+              fileUrl:
+                version &&
+                repoUrls[repository]
+                  ?.replaceAll("{{.Version}}", version)
+                  .replaceAll("{{.Path}}", fileName.text),
               // The 'template' is such that the line number can be `join`ed
               // into it. JSON serializable!
               lineNumberTemplate:

src/lib/server/zoekt-list-repositories.ts

@@ -89,14 +89,21 @@ const listResultSchema = v.object({
                     LatestCommitDate: dateSchema,
                     FileURLTemplate: v.string(),
                     CommitURLTemplate: v.string(),
-                    Branches: v.array(
-                      v
-                        .object({ Name: v.string(), Version: v.string() })
-                        .map(({ Name, Version }) => ({
-                          name: Name,
-                          version: Version,
-                        })),
-                    ),
+                    Branches: v
+                      .array(
+                        v
+                          .object({ Name: v.string(), Version: v.string() })
+                          .map(({ Name, Version }) => ({
+                            name: Name,
+                            version: Version,
+                          })),
+                      )
+                      // Zoekt returns `null` when there are no branches (e.g.
+                      // the repo is just a directory, no VCS info). To me that
+                      // seems wrong and I think it should be `omitempty`, so
+                      // tolerate both options in case that ever gets fixed.
+                      .nullable()
+                      .optional(),
                   })
                   .map(
                     ({
@@ -116,7 +123,7 @@ const listResultSchema = v.object({
                       lastCommit: toISOStringWithoutMs(LatestCommitDate),
                       fileUrlTemplate: FileURLTemplate,
                       commitUrlTemplate: CommitURLTemplate,
-                      branches: Branches,
+                      branches: Branches ?? [],
                     }),
                   ),
                 IndexMetadata: v