feat: add book detail view with spine-book-model, httpd/book handler, and title links

- Add spine--format-defs defconst shared between index and book models
- Add spine-book-model with status extraction, format selector, notes, recommendation
- Add templates/book.mustache (Pico CSS, journal-style layout)
- Add httpd/book handler serving the detail page
- Link book titles in index view to /book?id=X
- Add spine-book-model-test.el with 13 tests
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# Book Detail View Design
**Date:** 2026-06-22
**Status:** Draft
## Summary
Add a dedicated book detail page (`/book?id=X`) following the journal-style mockup (Direction B). The page shows full book metadata, format badges, reading log, note composer, and recommendation section. Uses Pico CSS and Tabler icons, matching the add-book template style.
## Route
- **`GET /book?id=<id>`** — renders the full detail page
- No POST handling (editing flows go through existing `/edit`)
- Book not found → redirect to `/index`
## Model: `spine-book-model`
Builds an `ht` (hashtable) view model from one book plist.
### Fields
| Field | Type | Source | Notes |
|---|---|---|---|
| `cover_icon` | string | hardcoded `"ti-book"` | Placeholder cover icon |
| `title` | string | `:title` minus TODO prefix | Strip leading `WANT `, `READING `, `READ ` |
| `author` | string | `:author` | Empty string when nil |
| `status_class` | string | TODO prefix → lowercase | `"want"` / `"reading"` / `"read"` / `""` |
| `status_label` | string | TODO prefix → capitalized | `"Want"` / `"Reading"` / `"Read"` / `""` |
| `meta` | string | format + added date | e.g. `"started 20 Feb · audiobook"`. Omits date if not present, format if not present |
| `progress_label` | string | — | Empty string; reserved for future progress tracking |
| `formats` | array | all 3 known formats | `[{icon, label, active}]`. Active matches `:format` property |
| `notes` | array | `:notes` | `[{date, text}]`. Empty array when no notes |
| `recommendation` | object or nil | `:rec_by` + `:rec_note` | `{initials, by, note}`. nil when no rec_by |
### Status extraction
Book headlines have TODO keyword prefixes (`WANT`, `READING`, `READ`) as part of their title text. The model function:
1. Strips the prefix from the title for display
2. Maps recognized prefixes to status classes
### Format list
Hardcoded list of three known formats:
- `hardcover``ti-book` → "Hardcover"
- `ebook``ti-device-tablet` → "eBook"
- `audiobook``ti-headphones` → "Audiobook"
The book's `:format` property determines which is `active: true`; the others are `active: false`.
### Recommendation
Generated from `:rec_by` (name) and `:rec_note` (text). No date stored currently.
`initials` derived from the name: uppercase first letter of each space-separated part. e.g. "Priya" → "P", "John Doe" → "JD".
## Template: `templates/book.mustache`
Based on `spine-mockup-b-journal.mustache` with adaptations:
- Pico CSS framework
- Tabler icons for icons
- Progress-related text omitted from the composer placeholder (says "Add a note…" without percentage)
- Back link at top to return to index with this book selected (`/index?id=X`)
- No recommendation date field (not stored in data model)
- Conditional rendering of recommendation section
## Handler: `httpd/book`
Registered as `httpd/book` matching the existing add/edit handler pattern:
```elisp
(defun httpd/book (proc uri-path query request)
"Show the journal-style detail page for a single book."
(let* ((id (cadr (assoc "id" query)))
(books (spine-books))
(book (cl-find id books :key (lambda (b) (plist-get b :id)) :test #'equal)))
(if book
(insert (spine-render "book.mustache" (spine-book-model book)))
(httpd-redirect proc "/index" 302))))
```
| Action | File | Description |
|---|---|---|
| New | `templates/book.mustache` | Pico CSS + Tabler detail page |
| Modify | `spine.el` | Add `spine-book-model`, `httpd/book` handler, title link in index model |
| New | `test/spine-book-model-test.el` | Tests for `spine-book-model` |
| Modify | `test/spine-index-model-test.el` | Tests for title link in index model |
## Edge cases
- **No TODO prefix on headline** → title shown as-is, status empty
- **Unknown TODO prefix** (not WANT/READING/READ) → title shown with prefix, status empty
- **Book not found** → redirect to `/index`
- **No format property** → no format active in the selector
- **No author** → empty string
- **No notes** → empty reading log section
- **No recommendation** → section not rendered (optional block)
## Testing
Test file `test/spine-book-model-test.el` covers:
- Title stripped of TODO prefix
- Status class derived correctly for WANT/READING/READ
- Meta string from format + added date
- Format list with correct active flag
- Notes mapping
- Recommendation with initials
- No recommendation when rec_by absent
- Book with no TODO prefix (handles gracefully)
- Book with no format or date (meta is empty)
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# Shelves data model
Replace the TODO-state-based book model with shelf-based organization.
Shelves are top-level Org headings; books are nested underneath them.
## Motivation
Books-as-top-level-headings with TODO states (WANT/READING/READ/ABANDONED)
made the file's structure reflect lifecycle status rather than organizing
concepts. The user wants arbitrary grouping ("shelves") as the primary
organizing axis. TODO states are removed — logbook entries (already present)
record when reading happened.
## Org data model
```org
#+TITLE: Spine
* Fiction
** Piranesi
:PROPERTIES:
:AUTHOR: Susanna Clarke
:FORMAT: ebook
:REC_BY: Alex
:REC_NOTE: Le Guin at her most human
:RATING:
:ADDED: [2026-04-01]
:LAST_MODIFIED: [2026-04-01]
:ID: 5e8d-pir
:END:
::LOGBOOK:
- State "READ" from "WANT" [2026-01-10]
::END:
- [2025-11-22] The pronoun game is a genuinely fresh take on identity.
* Non-Fiction
** The Checklist Manifesto
...
```
- Shelves are level-1 headlines (`*`)
- Books are level-2 headlines (`**`)
- Books keep their TODO keyword syntax for `org-mode` compatibility,
but the app ignores it entirely
- The `#+TODO:` line is removed — no TODO states
- Empty shelves (a level-1 headline with no children) are valid and
appear in the UI
- LOGBOOK drawers remain for historical state-change records but are
not surfaced by the UI
## Key functions
### `spine-shelves` (new)
Returns an ordered list of shelf names (strings), one per level-1 headline
that is not a COMMENT or archive target. Empty shelves are included.
### `spine-books` (modified)
Walks level-1 headlines as shelves. For each shelf, walks level-2 children
as books. Returns flat plist list; each book plist gains a `:shelf` key
with the parent headline text. No status/TODO filtering.
Places that previously checked Todo state (e.g. `spine-set-status`) are
removed — the only remaining mutable fields are notes, rating, format.
### `spine-index-model` (modified)
Groups books by `:shelf` instead of `:status`. Accepts an optional
`shelf` filter (instead of `read`/`want`/`all`) to show one shelf.
Includes shelf nav items for all shelves (even empty ones, from
`spine-shelves`).
Removes:
- Summary groups (READ/ABANDONED links)
- Concise view truncation
- Status-related book model fields (status_class, status_label)
### `spine-add-book` (modified)
Takes required `:shelf` argument. Inserts the new book heading under
the matching level-1 shelf headline instead of at file end. If the
shelf doesn't exist, signals an error (shelves are created manually).
Removes:
- `org-todo "WANT"` call
- `#+TODO:` file initialization
- Category field logic (replaced by shelf)
### Functions removed
- `spine-set-status` — no status to change. Logbook records history.
- All HTTP endpoints and UI actions that invoke it.
## UI changes
### Index view (`index.mustache`)
- **Titlebar**: `N books · M shelves`
- **Filter bar**: replaced with shelf nav — links for each shelf name
plus "All" (default). Active shelf highlighted.
- **Groups**: one section per shelf. Each shelf shows its books in the
existing row format, minus the status pill.
- **Empty shelves**: shown as a group with the shelf name and "(empty)"
subtext. No expandable books.
- **Minibuffer** (when a book is selected): simplified to two actions —
**Add note**, **Set rating**. Same for every book.
### Add form (`add.mustache`)
- "Category" free-text field replaced with "Shelf" `<select>` dropdown
populated from `spine-shelves`.
- Required. No datalist — only existing shelves.
- All other fields unchanged.
## Sample file
`sample-books.org` is restructured to the new shelf layout with
shelves like "Fiction", "Non-Fiction", "Science Fiction".
## Test changes
- `spine-books-parses-sample`: loads restructured sample, asserts flat
book list with `:shelf` keys.
- `spine-books-first-book-has-all-fields`: adds `:shelf` assertion.
- `spine-books-missing-properties-are-nil`: adds `:shelf` check.
- `spine-index-model-*`: rewritten — tests shelf grouping, shelf
filtering, empty-shelf inclusion. Status-based tests removed.
- `spine-add-book-*`: tests require `:shelf` arg. Removes status check.
Tests that books land under the correct shelf heading.
- `spine-edit-*`: keeps note/rating tests. Removes status-change tests.
Updates model-assertion tests for new minibuffer shape.
- New `spine-shelves` tests: parses shelf names, includes empty shelves.