Strip leading dot from file.ext to match Obsidian

AGENTS.md

@@ -94,6 +94,7 @@ When implementation decisions affect compatibility, runtime behaviour, performan
 
 - `this` is a file-like record. With `--base`/`basePath` it is a synthetic record of the base file itself (path/folder resolved relative to the vault root; no file read); in `--yaml`/flag/library mode without a base path it is an empty record at the vault root. This diverges from Obsidian embed-location semantics but supports the documented patterns (`this.file.folder`, `file.hasLink(this.file)`, `author == this`).
 - `file.folder` is supported and resolves to the vault-relative parent directory (`""` for root-level notes).
+- `file.ext` is the extension without a leading dot (`"md"`, `"base"`), matching Obsidian, so `file.ext == "md"` works. Applies to indexed notes, `this.file`, and link-derived file records. Runtime adapters' `extname` still returns the dotted form; the dot is stripped in core.
 - `file.backlinks` is computed during indexing from resolved `file.links` targets using unambiguous basename / exact path matching.
 - `random()` is deliberately not implemented for deterministic query evaluation.
 - Non-standard extension globals beyond the Obsidian function surface: `sum(values)`, `avg(values)`, `count(values)`, `contains(container, needle)`. List stat methods `values.mean()`, `values.sum()`, `values.min()`, `values.max()` are supported per official docs.

src/core/expression/evaluator.ts

@@ -923,7 +923,7 @@ function createSyntheticFile(pathLike: string): Record<string, unknown> {
   const folderIndex = path.lastIndexOf("/");
   const folder = folderIndex === -1 ? "" : path.slice(0, folderIndex);
   const dotIndex = name.lastIndexOf(".");
-  const ext = dotIndex === -1 ? "" : name.slice(dotIndex);
+  const ext = dotIndex === -1 ? "" : name.slice(dotIndex + 1);
 
   return {
     name,

src/core/vault-index.ts

@@ -170,7 +170,7 @@ export async function indexVault(options: VaultIndexOptions): Promise<VaultIndex
         basename: basenameFromPath(relativePath),
         path: relativePath,
         folder: folderFromPath(relativePath),
-        ext: options.adapter.extname(relativePath),
+        ext: options.adapter.extname(relativePath).replace(/^\./, ""),
         size: entry.stat.size,
         ctime: entry.stat.ctime,
         mtime: entry.stat.mtime,

src/query.ts

@@ -84,7 +84,7 @@ function resolveThisFile(options: QueryBaseOptions, adapter: RuntimeAdapter, dir
   const folder = slashIndex === -1 ? "" : relativePath.slice(0, slashIndex);
   const dotIndex = name.lastIndexOf(".");
   const basename = dotIndex === -1 ? name : name.slice(0, dotIndex);
-  const ext = dotIndex === -1 ? "" : name.slice(dotIndex);
+  const ext = dotIndex === -1 ? "" : name.slice(dotIndex + 1);
 
   return {
     name,

test-runtime/conformance-tests.mjs

@@ -149,7 +149,7 @@ views:
             basename: "a",
             path: "a.md",
             folder: "",
-            ext: ".md",
+            ext: "md",
             size: 1,
             ctime: new Date(0),
             mtime: new Date(0),

tests/expression-evaluator.test.ts

@@ -63,7 +63,7 @@ describe("expression evaluator", () => {
         basename: "note",
         path: "projects/note.md",
         folder: "projects",
-        ext: ".md",
+        ext: "md",
         size: 10,
         ctime: new Date("2024-01-01"),
         mtime: new Date("2024-01-02"),
@@ -161,7 +161,7 @@ describe("expression evaluator", () => {
         basename: "beta",
         path: "beta.md",
         folder: "",
-        ext: ".md",
+        ext: "md",
         size: 10,
         ctime: new Date("2024-01-01"),
         mtime: new Date("2024-01-02"),

tests/query-engine.test.ts

@@ -19,7 +19,7 @@ describe("query engine", () => {
         basename: (path.split("/").pop() ?? path).replace(/\.md$/, ""),
         path,
         folder: path.includes("/") ? path.slice(0, path.lastIndexOf("/")) : "",
-        ext: ".md",
+        ext: "md",
         size: 1,
         ctime: new Date(0),
         mtime: new Date(0),
@@ -287,6 +287,37 @@ views:
     expect(result.diagnostics.errors).toHaveLength(0);
   });
 
+  test("file.ext is the extension without a leading dot, as in Obsidian", async () => {
+    const spec = parseBaseYaml(
+      `
+filters: file.ext == "md"
+views:
+  - type: table
+    name: exts
+    properties:
+      - file.name
+      - file.ext
+`.trim(),
+    );
+
+    const compiled = compileQuery(spec);
+    const indexed = await indexVault({
+      rootDir: vaultDir,
+      include: ["**/*.md"],
+      exclude: [],
+      adapter: nodeAdapter,
+    });
+
+    const result = executeCompiledQuery({
+      compiled,
+      documents: indexed.documents,
+      view: "exts",
+    });
+
+    expect(result.rows).toHaveLength(indexed.documents.length);
+    expect(result.rows[0].projected["file.ext"]).toBe("md");
+  });
+
   test("strict mode rejects identifiers that exist nowhere in the vault", async () => {
     const spec = parseBaseYaml(
       `
@@ -456,7 +487,7 @@ views:
   test("this is a file-like object, stable across rows", async () => {
     const spec = parseBaseYaml(
       `
-filters: this.file.ext == ".base"
+filters: this.file.ext == "base"
 views:
   - type: table
     name: default
@@ -482,7 +513,7 @@ views:
         basename: "base",
         path: "queries/base.base",
         folder: "queries",
-        ext: ".base",
+        ext: "base",
         size: 0,
         ctime: new Date(0),
         mtime: new Date(0),
@@ -528,7 +559,7 @@ views:
         basename: "beta",
         path: "beta.md",
         folder: "",
-        ext: ".md",
+        ext: "md",
         size: 0,
         ctime: new Date(0),
         mtime: new Date(0),

tests/serialize.test.ts

@@ -11,7 +11,7 @@ const fixtureResult: QueryResult = {
         name: "alpha.md",
         path: "alpha.md",
         folder: "",
-        ext: ".md",
+        ext: "md",
         size: 10,
         ctime: new Date("2024-01-01"),
         mtime: new Date("2024-01-01"),