---
title: "Session: radiant-implementing-knuth — 2026-04-05"
type: source
tags: [claude-code, session-transcript, demo]
date: 2026-04-05
source_file: raw/sessions/demo-beta/2026-04-05-radiant-implementing-knuth.md
sessionId: demo-beta-002
slug: radiant-implementing-knuth
project: demo-beta
started: 2026-04-05T08:30:00+00:00
ended: 2026-04-05T10:12:47+00:00
cwd: /Users/USER/Desktop/demo-beta
gitBranch: main
permissionMode: default
model: claude-opus-4-6
user_messages: 6
tool_calls: 12
tools_used: [Read, Write, Edit, Bash, Glob]
is_subagent: false
---

# Session: radiant-implementing-knuth — 2026-04-05

**Project:** `demo-beta` · **Branch:** `main` · **Mode:** `default` · **Model:** `claude-opus-4-6`

**Stats:** 6 user messages, 12 tool calls, tools used: Read, Write, Edit, Bash, Glob.

## Conversation

### Turn 1 — User

Let's build stilo. Start with go.mod + cmd/stilo/main.go skeleton.

### Turn 1 — Assistant

**Tools used:**

- `Bash`: `cd /Users/USER/Desktop/demo-beta && go mod init github.com/USER/stilo`
- `Write`: `/Users/USER/Desktop/demo-beta/go.mod` (82 chars)

```go
module github.com/USER/stilo

go 1.22
```

**Tools used:**

- `Write`: `/Users/USER/Desktop/demo-beta/cmd/stilo/main.go` (624 chars)

```go
package main

import (
	"flag"
	"fmt"
	"log"
	"os"
)

func main() {
	var (
		contentDir = flag.String("content", "content", "content directory")
		publicDir  = flag.String("public", "public", "output directory")
	)
	flag.Parse()

	if _, err := os.Stat(*contentDir); os.IsNotExist(err) {
		log.Fatalf("content dir does not exist: %s", *contentDir)
	}
	if err := os.MkdirAll(*publicDir, 0o755); err != nil {
		log.Fatalf("cannot create public dir: %v", err)
	}
	fmt.Printf("stilo: walking %s → %s\n", *contentDir, *publicDir)
	// TODO: walk + render
}
```

Skeleton done. `go build ./cmd/stilo` should compile cleanly now.

### Turn 2 — User

Build and try it.

### Turn 2 — Assistant

**Tools used:**

- `Bash`: `cd /Users/USER/Desktop/demo-beta && go build ./cmd/stilo`

**Tool results:**

```
(no output — success)
```

**Tools used:**

- `Bash`: `cd /Users/USER/Desktop/demo-beta && mkdir -p content public && ./stilo`

**Tool results:**

```
stilo: walking content → public
```

Compiles and runs. Next: the content walker.

### Turn 3 — User

Write the content walker with frontmatter parsing. Keep it in internal/content/.

### Turn 3 — Assistant

**Tools used:**

- `Write`: `/Users/USER/Desktop/demo-beta/internal/content/content.go` (920 chars)

```go
package content

import (
	"bytes"
	"fmt"
	"os"
	"strings"
)

type Post struct {
	Path        string
	Title       string
	Date        string
	Body        []byte
}

func Load(path string) (*Post, error) {
	raw, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}
	if !bytes.HasPrefix(raw, []byte("---\n")) {
		return &Post{Path: path, Body: raw}, nil
	}
	end := bytes.Index(raw[4:], []byte("\n---\n"))
	if end < 0 {
		return nil, fmt.Errorf("%s: unterminated frontmatter", path)
	}
	fmRaw := string(raw[4 : 4+end])
	body := raw[4+end+5:]
	p := &Post{Path: path, Body: body}
	for _, line := range strings.Split(fmRaw, "\n") {
		k, v, ok := strings.Cut(line, ":")
		if !ok {
			continue
		}
		v = strings.TrimSpace(v)
		switch strings.TrimSpace(k) {
		case "title":
			p.Title = strings.Trim(v, `"`)
		case "date":
			p.Date = v
		}
	}
	return p, nil
}
```

This is the simplest possible frontmatter parser — no YAML library, just string splits. Handles `title:` and `date:` for now. We can add more fields later.

### Turn 4 — User

Write a test for Load.

### Turn 4 — Assistant

**Tools used:**

- `Write`: `/Users/USER/Desktop/demo-beta/internal/content/content_test.go` (512 chars)

```go
package content

import (
	"os"
	"path/filepath"
	"testing"
)

func TestLoad_WithFrontmatter(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "post.md")
	os.WriteFile(p, []byte("---\ntitle: Hello\ndate: 2026-04-05\n---\n# Hi\n"), 0o644)

	post, err := Load(p)
	if err != nil {
		t.Fatal(err)
	}
	if post.Title != "Hello" {
		t.Errorf("title: got %q", post.Title)
	}
	if post.Date != "2026-04-05" {
		t.Errorf("date: got %q", post.Date)
	}
	if string(post.Body) != "# Hi\n" {
		t.Errorf("body: got %q", post.Body)
	}
}

func TestLoad_NoFrontmatter(t *testing.T) {
	dir := t.TempDir()
	p := filepath.Join(dir, "post.md")
	os.WriteFile(p, []byte("# Just content\n"), 0o644)

	post, err := Load(p)
	if err != nil {
		t.Fatal(err)
	}
	if string(post.Body) != "# Just content\n" {
		t.Errorf("body: got %q", post.Body)
	}
}
```

### Turn 5 — User

Run the tests.

### Turn 5 — Assistant

**Tools used:**

- `Bash`: `cd /Users/USER/Desktop/demo-beta && go test ./internal/content/...`

**Tool results:**

```
ok  	github.com/USER/stilo/internal/content	0.003s
```

Both tests pass.

### Turn 6 — User

Commit with something reasonable and let's pause.

### Turn 6 — Assistant

**Tools used:**

- `Bash`: `cd /Users/USER/Desktop/demo-beta && git add cmd internal go.mod && git commit -m "feat: stilo skeleton + content loader with frontmatter"`

**Tool results:**

```
[main def5678] feat: stilo skeleton + content loader with frontmatter
 4 files changed, 156 insertions(+)
 create mode 100644 cmd/stilo/main.go
 create mode 100644 go.mod
 create mode 100644 internal/content/content.go
 create mode 100644 internal/content/content_test.go
```

Session summary: stilo is now a compiling Go binary with a frontmatter-aware content loader and passing tests. Next session tackles internal/walk/ and internal/render/, then we can render the first actual blog post.