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Merged
alexec merged 6 commits into from
Aug 12, 2026
Merged

feat: load diffs incrementally per repository #17

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5dd26fb
feat: load diffs incrementally per repository
alexec Aug 12, 2026
2170379
refactor: centralize diff UI styling in CSS variables
alexec Aug 12, 2026
e231f8c
feat: persist viewed files with hash-based invalidation
alexec Aug 12, 2026
b500822
Potential fix for pull request finding
alexec Aug 12, 2026
89a2dc2
Merge branch 'feat/incremental-diff-loading' of github.com:kitproj/di…
alexec Aug 12, 2026
cfaeaa1
fix: address PR review feedback for incremental diff loading
alexec Aug 12, 2026
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360 changes: 340 additions & 20 deletions diffs.html
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Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
<!doctype html>
<html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
Expand All @@ -13,44 +13,364 @@
/>
<link
rel="stylesheet"
type="text/css"
href="https://cdn.jsdelivr.net/npm/diff2html@3.4.48/bundles/css/diff2html.min.css"
integrity="sha384-iBvSlI3tNrrSIy7s6mvLg+5B2Z/QXbR4L0Pzg1nRf8zkXrz5JF316MLm2igMIpi2"
href="https://cdn.jsdelivr.net/npm/diff2html@3.4.56/bundles/css/diff2html.min.css"
integrity="sha384-PdRCG/+r1waybtXfuDB9Kmv2h7AGoN6WaTZ5OF+ctPeR9BGne0FaKRQnUeGV4nDL"
crossorigin="anonymous"
/>
<style>
:root {
--bg: #f6f8fa;
--surface: #fff;
--border: #d0d7de;
--text: #1f2328;
--muted: #656d76;
--danger: #cf222e;
--radius: 8px;
--space: 1rem;
--space-sm: 0.75rem;
--max-width: 1200px;
--font: system-ui, sans-serif;
--mono: ui-monospace, monospace;
--font-size: 14px;
--font-size-sm: 0.875rem;
--font-size-code: 12px;
}

/* app chrome */
body {
margin: 0 auto;
max-width: var(--max-width);
padding: 1.5rem;
background: var(--bg);
color: var(--text);
font: var(--font-size) / 1.5 var(--font);
}

h1 {
margin: 0 0 var(--space);
font-size: 1.25rem;
font-weight: 600;
}

#message {
margin-bottom: var(--space);
color: var(--muted);
}

#message.error {
color: var(--danger);
}

#diffs {
display: flex;
flex-direction: column;
gap: var(--space);
}

/* card */
.repo {
overflow: hidden;
border: 1px solid var(--border);
border-radius: var(--radius);
background: var(--surface);
}

.repo h2 {
margin: 0;
padding: var(--space-sm) var(--space);
border-bottom: 1px solid var(--border);
background: var(--bg);
font-size: var(--font-size-sm);
font-weight: 600;
word-break: break-all;
}

/* diff2html overrides */
.repo .d2h-wrapper {
margin: 0;
}

.repo .d2h-file-wrapper {
border: 0;
border-radius: 0;
margin: 0;
}

.repo .d2h-file-header {
border-top: 1px solid var(--border);
}

.repo .d2h-file-wrapper:first-child .d2h-file-header {
border-top: 0;
}

.repo .d2h-code-line-ctn {
font-family: var(--mono);
font-size: var(--font-size-code);
word-break: break-word;
}
</style>
</head>
<body>
<h1>Git Diffs</h1>
<div id="message">Loading diffs...</div>
<div id="diffs"></div>

<script
type="text/javascript"
src="https://cdn.jsdelivr.net/npm/diff2html@3.4.48/bundles/js/diff2html-ui.min.js"
integrity="sha384-99bAn+VpNpavq3FarkwuSuDPDHMeakTiNqxxz3ezwdGUr414srIXY3YmXjaAkYne"
src="https://cdn.jsdelivr.net/npm/diff2html@3.4.56/bundles/js/diff2html-ui.min.js"
integrity="sha384-NRd5i/CwvZ20mJEQt3yaDU1LeU+tu0bqyVYojXi8d7Lf1B0/TIs2K3FTvlf8aO7p"
crossorigin="anonymous"
></script>
<script>
const message = document.getElementById("message");
const diffs = document.getElementById("diffs");
let currentDiff = "";
const VIEWED_KEY = "diff-server-viewed";
const repoSections = new Map();

const viewedStore = {
load() {
try {
return JSON.parse(
localStorage.getItem(VIEWED_KEY) ?? "{}",
);
} catch {
return {};
}
},
save(state) {
localStorage.setItem(VIEWED_KEY, JSON.stringify(state));
},
};

async function hashText(text) {
const buf = await crypto.subtle.digest(
"SHA-256",
new TextEncoder().encode(text),
);
return Array.from(new Uint8Array(buf), (b) =>
b.toString(16).padStart(2, "0"),
).join("");
}

function parseFileDiffs(diffText) {
const files = new Map();
for (const chunk of diffText.split(/\n(?=diff --git )/)) {
if (!chunk.startsWith("diff --git ")) {
continue;
}
const match = chunk.match(
/^diff --git a\/(.+?) b\/(.+)$/m,
);
if (!match) {
continue;
}
files.set(match[2], chunk);
}
return files;
}

function fileKey(repo, path) {
return repo + ":" + path;
}

function setFileViewed(wrapper, viewed) {
const checkbox = wrapper.querySelector('input[name="viewed"]');
const collapse = wrapper.querySelector(".d2h-file-collapse");
const contents = wrapper.querySelector(
".d2h-file-diff, .d2h-files-diff",
);
if (!checkbox || !collapse || !contents) {
return;
}
checkbox.checked = viewed;
collapse.classList.toggle("d2h-selected", viewed);
contents.classList.toggle("d2h-d-none", viewed);
}

async function applyViewedState(repo, container, diffText, state) {
const fileDiffs = parseFileDiffs(diffText);
const entries = [...fileDiffs.entries()];
const hashes = new Map(
await Promise.all(
entries.map(async ([path, chunk]) => [
path,
await hashText(chunk),
]),
),
);
const wrappers = container.querySelectorAll(".d2h-file-wrapper");

wrappers.forEach((wrapper, index) => {
const path = entries[index]?.[0];
if (!path) {
return;
}

const hash = hashes.get(path);
const key = fileKey(repo, path);
const checkbox = wrapper.querySelector('input[name="viewed"]');
if (!checkbox) {
return;
}

checkbox.addEventListener("change", () => {
if (checkbox.checked && hash) {
state[key] = hash;
} else {
delete state[key];
}
viewedStore.save(state);
});

if (hash && state[key] === hash) {
setFileViewed(wrapper, true);
}
});
}

function pruneViewedState(state, sections) {
const validKeys = new Set();
for (const [repo, entry] of sections) {
for (const path of parseFileDiffs(entry.diffText).keys()) {
validKeys.add(fileKey(repo, path));
}
}

for (const key of Object.keys(state)) {
if (!validKeys.has(key)) {
delete state[key];
}
}
}

function removeRepoSection(repo) {
const entry = repoSections.get(repo);
if (!entry) {
return;
}
entry.section.remove();
repoSections.delete(repo);
}

function renderRepoSection(repo) {
const section = document.createElement("section");
section.className = "repo";

const title = document.createElement("h2");
title.textContent = repo;
section.appendChild(title);

const container = document.createElement("div");
container.className = "repo-diff";
section.appendChild(container);

return { section, container };
}

async function fetchAndRender() {
message.className = "";
message.textContent = "Loading diffs...";

try {
const response = await fetch("/diffs", {
headers: { Accept: "text/x-diff" },
});
const data = await response.text();
const reposResponse = await fetch("/repos");
if (!reposResponse.ok) {
throw new Error("Failed to list repositories");
}

const repos = await reposResponse.json();
const viewedState = viewedStore.load();
const activeRepos = new Set(repos);

if (data !== currentDiff) {
currentDiff = data;
await new Diff2HtmlUI(diffs, currentDiff).draw();
message.innerHTML = "";
for (const repo of repoSections.keys()) {
if (!activeRepos.has(repo)) {
removeRepoSection(repo);
}
}

if (repos.length === 0) {
diffs.innerHTML = "";
repoSections.clear();
pruneViewedState(viewedState, repoSections);
viewedStore.save(viewedState);
message.textContent = "No git repositories found.";
return;
}

let completed = 0;
let changedRepos = 0;

await Promise.all(
repos.map(async (repo) => {
try {
const response = await fetch(
"/diff?repo=" + encodeURIComponent(repo),
{ headers: { Accept: "text/x-diff" } },
);

if (!response.ok) {
return;
}

const data = await response.text();

if (!data.trim()) {
removeRepoSection(repo);
return;
}

changedRepos++;

const existing = repoSections.get(repo);
if (existing && existing.diffText === data) {
return;
}

removeRepoSection(repo);

const { section, container } =
renderRepoSection(repo);
diffs.appendChild(section);

new Diff2HtmlUI(container, data).draw();
await applyViewedState(
repo,
container,
data,
viewedState,
);
repoSections.set(repo, {
diffText: data,
section,
});
} catch {
return;
} finally {
completed++;
message.textContent =
"Loading diffs... (" +
completed +
"/" +
repos.length +
")";
}
}),
);

pruneViewedState(viewedState, repoSections);
viewedStore.save(viewedState);

if (changedRepos === 0) {
diffs.innerHTML = "";
repoSections.clear();
message.textContent = "No uncommitted changes.";
return;
}

message.textContent = "";
} catch (error) {
message.innerHTML =
"<div>Error fetching diffs: " +
error.message +
"</div>";
message.className = "error";
message.textContent =
"Error fetching diffs: " + error.message;
}
}

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