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703 | #!/usr/bin/env python3
"""Generate a book reader index.html inside each directory listed in metadata.json.
Each generated <directory>/index.html provides:
- Full-size page reader using `full/0001.webp` ... `full/NNNN.webp` (plus a toggle for `bw/`).
- Forward / Backward navigation (buttons, click zones, keyboard ArrowLeft/ArrowRight/j/k/Space).
- Page jumper input and progress indicator.
- "All Thumbnails" grid modal/drawer (`thumb/0001.webp` ... `thumb/NNNN.webp` with lazy loading)
to browse and jump to any page.
- URL state persistence (`?page=N` + `#page=N` support with `history.pushState` and `popstate`)
so bookmarking, sharing links, reloading, and browser back/forward keep the current page.
Usage:
python3 generate_readers.py [--metadata metadata.json] [--only SLUG]
"""
from __future__ import annotations
import argparse
import html
import json
import re
import sys
from pathlib import Path
from urllib.parse import quote
import fitz # PyMuPDF
def clean_display_title(source_path: str) -> str:
name = Path(source_path).name
stem = name[:-4] if name.lower().endswith(".pdf") else name
stem = re.sub(r"\s*\((kann+n?ada|english)\)\s*$", "", stem, flags=re.IGNORECASE)
return stem.strip()
def get_page_count(entry: dict, base_dir: Path) -> int:
"""Determine page count from extracted images or fallback to the source PDF."""
out_dir = base_dir / entry["directory"]
full_dir = out_dir / "full"
if full_dir.is_dir():
webps = sorted(full_dir.glob("*.webp"))
if webps:
# Also check PDF if available in case only partial pages were extracted so far
pdf_path = base_dir / entry["source"]
if pdf_path.is_file():
try:
with fitz.open(pdf_path) as doc:
return max(len(webps), len(doc))
except Exception: # noqa: BLE001
pass
return len(webps)
pdf_path = base_dir / entry["source"]
if pdf_path.is_file():
try:
with fitz.open(pdf_path) as doc:
return len(doc)
except Exception: # noqa: BLE001
return 0
return 0
def build_reader_html(entry: dict, page_count: int) -> str:
source = entry["source"]
en_title = clean_display_title(source)
kn_title = entry.get("kannada")
pdf_href = "../" + "/".join(quote(part) for part in Path(source).parts)
if kn_title:
page_title = f"{kn_title} — {en_title}"
header_title_html = (
f'<span class="title-kn">{html.escape(kn_title)}</span>'
f'<span class="title-en">{html.escape(en_title)}</span>'
)
else:
page_title = en_title
header_title_html = f'<span class="title-main">{html.escape(en_title)}</span>'
return f"""<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>{html.escape(page_title)} — Reader</title>
<style>
:root {{
--maroon: #72211f;
--maroon-dark: #571915;
--gold: #c9a227;
--bg: #1e1b18;
--panel: #2a2521;
--ink: #f5efe6;
--muted: #b8aca0;
--line: #3d352e;
}}
* {{ box-sizing: border-box; }}
body {{
margin: 0;
padding: 0;
background: var(--bg);
color: var(--ink);
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Georgia, sans-serif;
min-height: 100vh;
display: flex;
flex-direction: column;
}}
header {{
position: sticky;
top: 0;
z-index: 30;
background: var(--maroon);
color: #f7ecd4;
border-bottom: 3px solid var(--gold);
padding: 0.55rem 1rem;
display: flex;
flex-wrap: wrap;
align-items: center;
justify-content: space-between;
gap: 0.6rem;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.45);
}}
.brand {{
display: flex;
align-items: center;
gap: 0.75rem;
min-width: 0;
}}
.back-link {{
color: #ffe9b0;
text-decoration: none;
font-size: 0.88rem;
padding: 0.3rem 0.65rem;
border: 1px solid rgba(255, 233, 176, 0.45);
border-radius: 6px;
white-space: nowrap;
}}
.back-link:hover {{ background: var(--maroon-dark); }}
.book-title {{
display: flex;
flex-direction: column;
min-width: 0;
}}
.title-kn {{
font-size: 1.05rem;
font-weight: 600;
line-height: 1.25;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}}
.title-en {{
font-size: 0.8rem;
color: #ecd9ae;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}}
.title-main {{
font-size: 1.02rem;
font-weight: 600;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
}}
.toolbar {{
display: flex;
align-items: center;
flex-wrap: wrap;
gap: 0.4rem;
}}
button, .btn-link, select {{
font-family: inherit;
font-size: 0.85rem;
color: #fff;
background: rgba(0, 0, 0, 0.28);
border: 1px solid rgba(255, 233, 176, 0.4);
border-radius: 6px;
padding: 0.35rem 0.7rem;
cursor: pointer;
text-decoration: none;
display: inline-flex;
align-items: center;
gap: 0.3rem;
}}
button:hover:not(:disabled), .btn-link:hover, select:hover {{
background: var(--maroon-dark);
}}
button:disabled {{
opacity: 0.4;
cursor: not-allowed;
}}
button.active {{
background: var(--gold);
color: #1e1b18;
border-color: var(--gold);
font-weight: 600;
}}
.page-jump {{
display: inline-flex;
align-items: center;
gap: 0.3rem;
font-size: 0.85rem;
}}
#page-input {{
width: 4.2rem;
text-align: center;
padding: 0.3rem 0.35rem;
border-radius: 6px;
border: 1px solid rgba(255, 233, 176, 0.5);
background: rgba(0, 0, 0, 0.35);
color: #fff;
font-size: 0.85rem;
}}
main {{
flex: 1;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
position: relative;
padding: 1rem 0.5rem 2.5rem;
}}
.stage {{
position: relative;
display: flex;
align-items: center;
justify-content: center;
max-width: 100%;
}}
#page-img {{
display: block;
background: #fff;
box-shadow: 0 6px 28px rgba(0, 0, 0, 0.65);
border-radius: 2px;
user-select: none;
max-width: min(1000px, 96vw);
height: auto;
}}
body.fit-height #page-img {{
max-height: calc(100vh - 96px);
width: auto;
max-width: 96vw;
}}
body.fit-original #page-img {{
max-width: none;
max-height: none;
}}
.nav-zone {{
position: fixed;
top: 64px;
bottom: 48px;
width: 12vw;
min-width: 44px;
max-width: 140px;
display: flex;
align-items: center;
justify-content: center;
cursor: pointer;
z-index: 10;
opacity: 0;
transition: opacity 0.15s ease;
user-select: none;
}}
.nav-zone:hover {{ opacity: 1; }}
.nav-zone.prev {{ left: 0; }}
.nav-zone.next {{ right: 0; }}
.nav-pill {{
background: rgba(114, 33, 31, 0.88);
color: #fff;
border: 1px solid var(--gold);
border-radius: 999px;
padding: 0.6rem 0.9rem;
font-size: 1.1rem;
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}}
.bottom-bar {{
position: fixed;
bottom: 0;
left: 0;
right: 0;
z-index: 25;
background: rgba(42, 37, 33, 0.95);
border-top: 1px solid var(--line);
padding: 0.4rem 1rem;
display: flex;
align-items: center;
justify-content: center;
gap: 0.6rem;
font-size: 0.82rem;
color: var(--muted);
backdrop-filter: blur(6px);
}}
#scrubber {{
width: min(420px, 55vw);
accent-color: var(--gold);
cursor: pointer;
}}
/* Thumbnails Drawer / Modal */
#thumbs-overlay {{
position: fixed;
inset: 0;
z-index: 50;
background: rgba(18, 15, 13, 0.94);
display: none;
flex-direction: column;
}}
#thumbs-overlay.open {{
display: flex;
}}
.thumbs-header {{
background: var(--panel);
border-bottom: 1px solid var(--line);
padding: 0.75rem 1.2rem;
display: flex;
align-items: center;
justify-content: space-between;
}}
.thumbs-grid {{
flex: 1;
overflow-y: auto;
padding: 1.2rem;
display: grid;
grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
gap: 1rem;
align-content: start;
}}
.thumb-card {{
background: var(--panel);
border: 2px solid transparent;
border-radius: 6px;
padding: 0.4rem;
text-align: center;
cursor: pointer;
color: var(--ink);
text-decoration: none;
transition: transform 0.12s ease, border-color 0.12s ease;
}}
.thumb-card:hover {{
transform: translateY(-2px);
border-color: rgba(201, 162, 39, 0.6);
}}
.thumb-card.current {{
border-color: var(--gold);
background: rgba(201, 162, 39, 0.16);
}}
.thumb-card img {{
width: 100%;
aspect-ratio: 1 / 1.42;
object-fit: contain;
background: #fff;
border-radius: 3px;
display: block;
}}
.thumb-label {{
margin-top: 0.35rem;
font-size: 0.78rem;
color: var(--muted);
}}
.thumb-card.current .thumb-label {{
color: var(--gold);
font-weight: 600;
}}
.status-msg {{
margin-top: 1rem;
color: var(--muted);
font-size: 0.9rem;
text-align: center;
}}
</style>
</head>
<body>
<header>
<div class="brand">
<a class="back-link" href="../index.html">← All Books</a>
<div class="book-title">{header_title_html}</div>
</div>
<div class="toolbar">
<button type="button" id="btn-first" title="First page (Home)">«</button>
<button type="button" id="btn-prev" title="Previous page (←)">‹ Prev</button>
<form class="page-jump" id="jump-form">
<input id="page-input" type="number" min="1" max="{page_count}" value="1" aria-label="Page number">
<span>/ <span id="total-pages">{page_count}</span></span>
</form>
<button type="button" id="btn-next" title="Next page (→)">Next ›</button>
<button type="button" id="btn-last" title="Last page (End)">»</button>
<button type="button" id="btn-thumbs" title="View all page thumbnails (G)">Thumbnails</button>
<select id="mode-select" aria-label="Image mode" title="Switch between Full Resolution and Clean Grayscale/BW">
<option value="full" selected>Full Resolution</option>
<option value="bw">Clean / B&W</option>
</select>
<select id="fit-select" aria-label="Fit mode" title="Page fit mode">
<option value="width" selected>Fit Width</option>
<option value="height">Fit Height</option>
<option value="original">Actual Size</option>
</select>
<a class="btn-link" href="{pdf_href}" download title="Download original PDF">PDF</a>
</div>
</header>
<main>
<div class="nav-zone prev" id="zone-prev" title="Previous page"><span class="nav-pill">‹</span></div>
<div class="stage">
<img id="page-img" alt="Page 1" src="full/0001.webp">
</div>
<div class=" status-msg" id="status-msg" hidden></div>
<div class="nav-zone next" id="zone-next" title="Next page"><span class="nav-pill">›</span></div>
</main>
<div class="bottom-bar">
<span id="page-caption">Page 1 of {page_count}</span>
<input id="scrubber" type="range" min="1" max="{max(1, page_count)}" value="1" aria-label="Page slider">
<span>Keys: ←/→ turn page · G thumbnails · F fit</span>
</div>
<div id="thumbs-overlay" role="dialog" aria-modal="true" aria-label="Page Thumbnails">
<div class="thumbs-header">
<strong>All Pages ({page_count})</strong>
<button type="button" id="btn-close-thumbs">Close (Esc)</button>
</div>
<div class="thumbs-grid" id="thumbs-grid"></div>
</div>
<script>
(function () {{
var TOTAL = {page_count};
var currentPage = 1;
var currentMode = 'full';
var thumbsBuilt = false;
var imgEl = document.getElementById('page-img');
var inputEl = document.getElementById('page-input');
var scrubberEl = document.getElementById('scrubber');
var captionEl = document.getElementById('page-caption');
var statusEl = document.getElementById('status-msg');
var btnFirst = document.getElementById('btn-first');
var btnPrev = document.getElementById('btn-prev');
var btnNext = document.getElementById('btn-next');
var btnLast = document.getElementById('btn-last');
var btnThumbs = document.getElementById('btn-thumbs');
var btnCloseThumbs = document.getElementById('btn-close-thumbs');
var overlayEl = document.getElementById('thumbs-overlay');
var gridEl = document.getElementById('thumbs-grid');
var modeSelect = document.getElementById('mode-select');
var fitSelect = document.getElementById('fit-select');
function pad4(n) {{
return String(n).padStart(4, '0');
}}
function pageUrl(page, mode) {{
return (mode || currentMode) + '/' + pad4(page) + '.webp';
}}
function thumbUrl(page) {{
return 'thumb/' + pad4(page) + '.webp';
}}
function readStateFromUrl() {{
var params = new URLSearchParams(window.location.search);
var p = parseInt(params.get('page'), 10);
if (!p && window.location.hash) {{
var m = window.location.hash.match(/page=(\\d+)/);
if (m) p = parseInt(m[1], 10);
}}
if (isNaN(p) || p < 1) p = 1;
if (TOTAL > 0 && p > TOTAL) p = TOTAL;
var mode = params.get('mode');
if (mode === 'bw' || mode === 'full') {{
currentMode = mode;
modeSelect.value = mode;
}}
return p;
}}
function writeStateToUrl(replace) {{
var url = new URL(window.location.href);
url.searchParams.set('page', String(currentPage));
if (currentMode !== 'full') {{
url.searchParams.set('mode', currentMode);
}} else {{
url.searchParams.delete('mode');
}}
try {{
if (replace) {{
window.history.replaceState({{ page: currentPage, mode: currentMode }}, '', url);
}} else {{
window.history.pushState({{ page: currentPage, mode: currentMode }}, '', url);
}}
}} catch (e) {{
window.location.hash = 'page=' + currentPage;
}}
}}
function preload(page) {{
if (page < 1 || page > TOTAL) return;
var pre = new Image();
pre.src = pageUrl(page, currentMode);
}}
function updateHighlightInThumbs() {{
if (!thumbsBuilt) return;
var prev = gridEl.querySelector('.thumb-card.current');
if (prev) prev.classList.remove('current');
var next = gridEl.querySelector('[data-page="' + currentPage + '"]');
if (next) next.classList.add('current');
}}
function goToPage(page, opts) {{
opts = opts || {{}};
if (TOTAL < 1) return;
var target = Math.max(1, Math.min(TOTAL, parseInt(page, 10) || 1));
currentPage = target;
statusEl.hidden = true;
imgEl.src = pageUrl(currentPage, currentMode);
imgEl.alt = 'Page ' + currentPage;
inputEl.value = String(currentPage);
scrubberEl.value = String(currentPage);
captionEl.textContent = 'Page ' + currentPage + ' of ' + TOTAL;
btnFirst.disabled = currentPage <= 1;
btnPrev.disabled = currentPage <= 1;
btnNext.disabled = currentPage >= TOTAL;
btnLast.disabled = currentPage >= TOTAL;
if (!opts.skipUrl) {{
writeStateToUrl(Boolean(opts.replaceUrl));
}}
updateHighlightInThumbs();
preload(currentPage + 1);
preload(currentPage - 1);
if (!opts.keepScroll) {{
window.scrollTo({{ top: 0, behavior: 'instant' }});
}}
}}
imgEl.addEventListener('error', function () {{
statusEl.hidden = false;
statusEl.textContent = 'Page image ' + pageUrl(currentPage, currentMode) + ' has not been generated yet. Run convert_pages.py to extract pages.';
}});
function buildThumbs() {{
if (thumbsBuilt) return;
var frag = document.createDocumentFragment();
for (var i = 1; i <= TOTAL; i++) {{
var a = document.createElement('a');
a.className = 'thumb-card' + (i === currentPage ? ' current' : '');
a.dataset.page = String(i);
a.href = '?page=' + i;
var im = document.createElement('img');
im.loading = 'lazy';
im.src = thumbUrl(i);
im.alt = 'Page ' + i;
var lbl = document.createElement('div');
lbl.className = 'thumb-label';
lbl.textContent = 'Page ' + i;
a.appendChild(im);
a.appendChild(lbl);
a.addEventListener('click', function (ev) {{
ev.preventDefault();
var p = parseInt(this.dataset.page, 10);
closeThumbs();
goToPage(p);
}});
frag.appendChild(a);
}}
gridEl.appendChild(frag);
thumbsBuilt = true;
}}
function openThumbs() {{
buildThumbs();
updateHighlightInThumbs();
overlayEl.classList.add('open');
btnThumbs.classList.add('active');
var cur = gridEl.querySelector('.thumb-card.current');
if (cur) cur.scrollIntoView({{ block: 'center' }});
}}
function closeThumbs() {{
overlayEl.classList.remove('open');
btnThumbs.classList.remove('active');
}}
function toggleThumbs() {{
if (overlayEl.classList.contains('open')) closeThumbs();
else openThumbs();
}}
btnFirst.addEventListener('click', function () {{ goToPage(1); }});
btnPrev.addEventListener('click', function () {{ goToPage(currentPage - 1); }});
btnNext.addEventListener('click', function () {{ goToPage(currentPage + 1); }});
btnLast.addEventListener('click', function () {{ goToPage(TOTAL); }});
document.getElementById('zone-prev').addEventListener('click', function () {{ goToPage(currentPage - 1); }});
document.getElementById('zone-next').addEventListener('click', function () {{ goToPage(currentPage + 1); }});
document.getElementById('jump-form').addEventListener('submit', function (e) {{
e.preventDefault();
goToPage(inputEl.value);
}});
inputEl.addEventListener('change', function () {{
goToPage(inputEl.value);
}});
scrubberEl.addEventListener('input', function () {{
captionEl.textContent = 'Page ' + scrubberEl.value + ' of ' + TOTAL;
}});
scrubberEl.addEventListener('change', function () {{
goToPage(scrubberEl.value);
}});
btnThumbs.addEventListener('click', toggleThumbs);
btnCloseThumbs.addEventListener('click', closeThumbs);
overlayEl.addEventListener('click', function (e) {{
if (e.target === overlayEl) closeThumbs();
}});
modeSelect.addEventListener('change', function () {{
currentMode = modeSelect.value;
goToPage(currentPage, {{ keepScroll: true }});
}});
fitSelect.addEventListener('change', function () {{
document.body.classList.remove('fit-height', 'fit-original');
if (fitSelect.value === 'height') document.body.classList.add('fit-height');
else if (fitSelect.value === 'original') document.body.classList.add('fit-original');
}});
window.addEventListener('popstate', function () {{
goToPage(readStateFromUrl(), {{ skipUrl: true }});
}});
window.addEventListener('hashchange', function () {{
goToPage(readStateFromUrl(), {{ skipUrl: true }});
}});
window.addEventListener('keydown', function (e) {{
if (e.target === inputEl || e.target === modeSelect || e.target === fitSelect) return;
if (e.key === 'Escape' && overlayEl.classList.contains('open')) {{
closeThumbs();
return;
}}
if (e.key === 'g' || e.key === 'G') {{
e.preventDefault();
toggleThumbs();
return;
}}
if (overlayEl.classList.contains('open')) return;
if (e.key === 'ArrowRight' || e.key === 'j' || e.key === 'PageDown') {{
e.preventDefault();
goToPage(currentPage + 1);
}} else if (e.key === 'ArrowLeft' || e.key === 'k' || e.key === 'PageUp') {{
e.preventDefault();
goToPage(currentPage - 1);
}} else if (e.key === 'Home') {{
e.preventDefault();
goToPage(1);
}} else if (e.key === 'End') {{
e.preventDefault();
goToPage(TOTAL);
}} else if (e.key === 'f' || e.key === 'F') {{
e.preventDefault();
var order = ['width', 'height', 'original'];
var nextFit = order[(order.indexOf(fitSelect.value) + 1) % order.length];
fitSelect.value = nextFit;
fitSelect.dispatchEvent(new Event('change'));
}}
}});
goToPage(readStateFromUrl(), {{ replaceUrl: true }});
}})();
</script>
</body>
</html>
"""
def main() -> int:
p = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
p.add_argument("--metadata", type=Path, default=Path("metadata.json"), help="Path to metadata.json")
p.add_argument("--only", type=str, default=None, help="Only generate reader for matching directory slug")
args = p.parse_args()
meta_path = args.metadata.resolve()
base_dir = meta_path.parent
entries = json.loads(meta_path.read_text(encoding="utf-8"))
if args.only:
entries = [e for e in entries if args.only in e["directory"] or args.only in e["source"]]
written = 0
for entry in entries:
out_dir = base_dir / entry["directory"]
out_dir.mkdir(parents=True, exist_ok=True)
pages = get_page_count(entry, base_dir)
reader_html = build_reader_html(entry, pages)
(out_dir / "index.html").write_text(reader_html, encoding="utf-8")
written += 1
print(f"Generated index.html in {written} director{'y' if written == 1 else 'ies'}.")
return 0
if __name__ == "__main__":
sys.exit(main())
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