feat: add kitchen view command and parser skeleton (task 0003)

Cut the first vertical slice through both layers: a runnable
`kitchen view <file>` that reads a Recipe File, parses it, and renders
it styled to the terminal.

@kitchen-md/core exposes a pure, total `parse(input): DocumentAST` built
on a minimal remark pipeline (parse + frontmatter) with a translation
layer to core's own AST types — frontmatter passthrough, HeadingBlock,
ParagraphBlock, and TextNode. remark types never leak into the public
API.

@kitchen-md/bin's `view` subcommand (commander) reads the file and hands
the DocumentAST to a pure `render(ast): string` (chalk, ANSI
auto-suppressed off a TTY). Fallible file I/O is modelled as a neverthrow
Result over a tagged-union CliError, matched at the boundary: stdout on
success, stderr and exit 1 on failure. The command functions sit beside
the import.meta.main-guarded CLI entry so they are testable in-process.

Tests follow ADR 0009's tiers — unit (parse, render), integration (the
view command's Result), and e2e (the binary as a subprocess) — with
coverage, a path-scoped test-report generator, and a prose fixture
rounding out the tooling. ADR 0008 records errors-as-values at the CLI
boundary; ADR 0009 records the testing tiers.

packages/core/package.json

@@ -8,5 +8,11 @@
   },
   "scripts": {
     "test": "bun test"
+  },
+  "dependencies": {
+    "remark-frontmatter": "^5.0.0",
+    "remark-parse": "^11.0.0",
+    "unified": "^11.0.5",
+    "yaml": "^2.9.0"
   }
 }

packages/core/src/index.ts

@@ -1 +1,2 @@
-export {};
+export { parse } from "./parse.ts";
+export type * from "./types.ts";

packages/core/src/index_test.ts

@@ -1,86 +0,0 @@
-import { describe, test } from "bun:test";
-
-describe("parser", () => {
-  describe("frontmatter", () => {
-    test.todo("parses frontmatter fields as-is");
-    test.todo("returns an empty object for empty frontmatter");
-    test.todo("returns an empty object when there is no frontmatter");
-    test.todo(
-      "does not throw on malformed frontmatter: frontmatter is {}, body still parses, and an invalid-frontmatter diagnostic preserves the raw YAML",
-    );
-  });
-
-  describe("blocks", () => {
-    test.todo("parses headings at every level (1-6)");
-    test.todo("parses paragraphs with typed inline nodes");
-    test.todo("parses an ordered list");
-    test.todo("parses an unordered list");
-    test.todo("models a list item as a container wrapping a paragraph, not a bare inline array");
-    test.todo("parses a code block and does not annotate its content");
-    test.todo("parses a thematic break");
-    test.todo("parses a blockquote as a container block");
-    test.todo("parses a callout (> [!note]) as an ordinary blockquote");
-  });
-
-  describe("inline nodes", () => {
-    test.todo("parses plain text");
-    test.todo("parses emphasis");
-    test.todo("parses strong");
-    test.todo("parses a code span and does not annotate its content");
-    test.todo("parses a link with href and inline content");
-    test.todo("parses a wikilink");
-    test.todo("parses a wikilink with an anchor");
-    test.todo("parses a wikilink with a display alias");
-    test.todo("parses a transclusion");
-    test.todo("parses a transclusion with a display alias");
-  });
-
-  describe("raw fallbacks", () => {
-    test.todo(
-      "preserves an unmodelled block (e.g. a GFM table) as a RawBlock with verbatim source",
-    );
-    test.todo(
-      "preserves an unmodelled inline (e.g. strikethrough) as a RawInline with verbatim source",
-    );
-  });
-
-  describe("ingredient annotations", () => {
-    test.todo("extracts ingredient name, quantity, and unit");
-    test.todo("extracts multi-word ingredient name");
-    test.todo("extracts ingredient with a unit-less quantity");
-    test.todo("extracts ingredient with no quantity");
-  });
-
-  describe("cookware annotations", () => {
-    test.todo("extracts cookware with quantity and unit");
-    test.todo("extracts cookware with no quantity");
-    test.todo("extracts multi-word cookware name");
-  });
-
-  describe("timer annotations", () => {
-    test.todo("extracts timer as a single value");
-    test.todo("extracts timer as a range");
-    test.todo("normalises timer unit aliases to canonical form");
-    test.todo("matches timer units case-insensitively (~5 Mins -> min)");
-  });
-
-  describe("unit normalisation", () => {
-    test.todo("normalises a known alias to canonical (grams -> g)");
-    test.todo("matches unit aliases case-insensitively (Tbsp -> tbsp)");
-    test.todo("normalises a multi-word alias (fluid ounces -> fl oz)");
-    test.todo("passes an unknown unit through verbatim");
-  });
-
-  describe("annotation scope", () => {
-    test.todo("captures annotations embedded mid-sentence");
-    test.todo("captures annotations inside a container (blockquote or list item)");
-    test.todo("does not extract annotations inside a code span");
-    test.todo("does not extract annotations inside a code block");
-  });
-
-  describe("transclusion", () => {
-    test.todo("passes a Step Reference anchor through as-is");
-  });
-
-  test.todo("standard Markdown elements pass through without interference");
-});

packages/core/src/integration_test.ts

@@ -1,8 +0,0 @@
-import { describe, test } from "bun:test";
-
-describe("parser — integration", () => {
-  test.todo("parses the primary fixture into the complete Document AST");
-  test.todo("extracts every annotation type from the primary fixture");
-  test.todo("extracts an annotation from inside the fixture's blockquote");
-  test.todo("normalises the fixture's non-canonical unit (tablespoons -> tbsp)");
-});

packages/core/src/parse.ts

@@ -0,0 +1,46 @@
+import type { PhrasingContent, Root, RootContent } from "mdast";
+import remarkFrontmatter from "remark-frontmatter";
+import remarkParse from "remark-parse";
+import { unified } from "unified";
+import { parse as parseYaml } from "yaml";
+import type { Block, DocumentAST, Frontmatter, InlineNode } from "./types.ts";
+
+const processor = unified().use(remarkParse).use(remarkFrontmatter);
+
+export function parse(input: string): DocumentAST {
+  const tree = processor.parse(input);
+  const frontmatter = extractFrontmatter(tree);
+  const blocks = tree.children.flatMap(translateBlock);
+  return { frontmatter, blocks, diagnostics: [] };
+}
+
+function extractFrontmatter(tree: Root): Frontmatter {
+  const yamlNode = tree.children.find((node) => node.type === "yaml");
+  if (!yamlNode) {
+    return {};
+  }
+  const data = parseYaml(yamlNode.value);
+  if (data !== null && typeof data === "object" && !Array.isArray(data)) {
+    return data as Frontmatter;
+  }
+  return {};
+}
+
+function translateBlock(node: RootContent): Block[] {
+  if (node.type === "heading") {
+    return [{ type: "heading", level: node.depth, children: translateInline(node.children) }];
+  }
+  if (node.type === "paragraph") {
+    return [{ type: "paragraph", children: translateInline(node.children) }];
+  }
+  return [];
+}
+
+function translateInline(nodes: PhrasingContent[]): InlineNode[] {
+  return nodes.flatMap((node) => {
+    if (node.type === "text") {
+      return [{ type: "text", value: node.value }];
+    }
+    return [];
+  });
+}

packages/core/src/parse_test.ts

@@ -0,0 +1,102 @@
+import { describe, expect, test } from "bun:test";
+import { parse } from "@kitchen-md/core";
+
+describe("parse", () => {
+  test("frontmatter passthrough — arbitrary fields become a plain object", () => {
+    const input = `---
+title: Buttered Toast
+servings: 2
+tags: [breakfast, simple]
+---
+
+# Buttered Toast
+`;
+
+    const result = parse(input);
+
+    expect(result.frontmatter).toEqual({
+      title: "Buttered Toast",
+      servings: 2,
+      tags: ["breakfast", "simple"],
+    });
+  });
+
+  test("frontmatter is an empty object when absent", () => {
+    const result = parse("# Just a heading");
+
+    expect(result.frontmatter).toEqual({});
+  });
+
+  test("frontmatter is an empty object when the block is empty", () => {
+    const input = `---
+---
+
+# Heading
+`;
+
+    const result = parse(input);
+
+    expect(result.frontmatter).toEqual({});
+  });
+
+  test("headings are modelled at every level 1–6 with TextNode children", () => {
+    const cases: [string, 1 | 2 | 3 | 4 | 5 | 6, string][] = [
+      ["# Level One", 1, "Level One"],
+      ["## Level Two", 2, "Level Two"],
+      ["### Level Three", 3, "Level Three"],
+      ["#### Level Four", 4, "Level Four"],
+      ["##### Level Five", 5, "Level Five"],
+      ["###### Level Six", 6, "Level Six"],
+    ];
+
+    for (const [markdown, level, text] of cases) {
+      const result = parse(markdown);
+
+      expect(result.blocks).toEqual([
+        {
+          type: "heading",
+          level,
+          children: [{ type: "text", value: text }],
+        },
+      ]);
+    }
+  });
+
+  test("a paragraph is a ParagraphBlock with TextNode content", () => {
+    const result = parse("Just some plain prose.");
+
+    expect(result.blocks).toEqual([
+      {
+        type: "paragraph",
+        children: [{ type: "text", value: "Just some plain prose." }],
+      },
+    ]);
+  });
+
+  test("blocks are flat and in document order — a heading is a sibling of the following paragraph", () => {
+    const input = `# Title
+
+A paragraph under it.
+`;
+
+    const result = parse(input);
+
+    expect(result.blocks).toEqual([
+      {
+        type: "heading",
+        level: 1,
+        children: [{ type: "text", value: "Title" }],
+      },
+      {
+        type: "paragraph",
+        children: [{ type: "text", value: "A paragraph under it." }],
+      },
+    ]);
+  });
+
+  test("diagnostics are empty in the normal case", () => {
+    const result = parse("# Ok");
+
+    expect(result.diagnostics).toEqual([]);
+  });
+});

packages/core/src/types.ts

@@ -0,0 +1,35 @@
+// The public AST node and document types returned by parse.
+
+export type Frontmatter = Record<string, unknown>;
+
+export interface Diagnostic {
+  severity: "warning";
+  code: string;
+  message: string;
+}
+
+export interface TextNode {
+  type: "text";
+  value: string;
+}
+
+export type InlineNode = TextNode;
+
+export interface HeadingBlock {
+  type: "heading";
+  level: 1 | 2 | 3 | 4 | 5 | 6;
+  children: InlineNode[];
+}
+
+export interface ParagraphBlock {
+  type: "paragraph";
+  children: InlineNode[];
+}
+
+export type Block = HeadingBlock | ParagraphBlock;
+
+export interface DocumentAST {
+  frontmatter: Frontmatter;
+  blocks: Block[];
+  diagnostics: Diagnostic[];
+}