Add the build link bisect tool to the website (#3902)

* Add the bisect tool

* Add `cargo run explore` to open bisect tool

* Website cleanup

* Bug fixes

* Fix again
This commit is contained in:
Keavon Chambers 2026-03-15 05:14:30 -07:00
parent 4c45c88034
commit f7815d0cd0
9 changed files with 879 additions and 11 deletions

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@ -6,6 +6,7 @@ pub mod requirements;
pub enum Action {
Run,
Build,
Explore(Option<String>),
}
pub enum Target {
@ -36,6 +37,7 @@ impl Task {
let (action, args) = match args.first() {
Some(&"build") => (Action::Build, &args[1..]),
Some(&"run") => (Action::Run, &args[1..]),
Some(&"explore") => (Action::Explore(args.get(1).map(|s| s.to_string())), &[] as &[&str]),
Some(&"help") => return None,
_ => (Action::Run, args),
};
@ -74,6 +76,34 @@ pub fn npm_run_in_frontend_dir(args: &str) -> Result<(), Error> {
run_from(&format!("{npm} run {args}"), Some(&frontend_dir))
}
pub fn open_url(url: &str) -> Result<(), Error> {
#[cfg(target_os = "windows")]
let mut cmd = process::Command::new("cmd");
#[cfg(target_os = "windows")]
cmd.args(["/c", "start", url]);
#[cfg(target_os = "macos")]
let mut cmd = process::Command::new("open");
#[cfg(target_os = "macos")]
cmd.arg(url);
#[cfg(not(any(target_os = "windows", target_os = "macos")))]
let mut cmd = process::Command::new("xdg-open");
#[cfg(not(any(target_os = "windows", target_os = "macos")))]
cmd.arg(url);
let command_str = format!("{:?}", cmd);
let exit_code = cmd
.spawn()
.map_err(|e| Error::Io(e, format!("Failed to spawn command '{command_str}'")))?
.wait()
.map_err(|e| Error::Io(e, format!("Failed to wait for command '{command_str}'")))?;
if !exit_code.success() {
return Err(Error::Command(command_str, exit_code));
}
Ok(())
}
fn run_from(command: &str, dir: Option<&PathBuf>) -> Result<(), Error> {
let command = command.split_whitespace().collect::<Vec<_>>();
let mut cmd = process::Command::new(command[0]);

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@ -15,6 +15,7 @@ fn usage() {
println!("<command>:");
println!(" [run] Run the selected target (default)");
println!(" build Build the selected target");
println!(" explore Open an assortment of tools for exploring the codebase");
println!(" help Show this message");
println!("<target>:");
println!(" [web] Web app (default)");
@ -50,7 +51,35 @@ fn main() -> ExitCode {
ExitCode::SUCCESS
}
fn explore_usage() {
println!();
println!("USAGE:");
println!(" cargo run explore <tool>");
println!();
println!("OPTIONS:");
println!("<tool>:");
println!(" bisect Binary search through recent commits to find which introduced a bug or feature");
println!(" editor View an interactive outline of the editor's message system architecture");
println!();
}
fn run_task(task: &Task) -> Result<(), Error> {
if let Action::Explore(tool) = &task.action {
match tool.as_deref() {
Some("bisect") => return open_url("https://graphite.art/volunteer/guide/codebase-overview/debugging-tips/#build-bisect-tool"),
Some("editor") => return open_url("https://graphite.art/volunteer/guide/codebase-overview/editor-structure/#editor-outline"),
None | Some("--help") => {
explore_usage();
return Ok(());
}
Some(other) => {
eprintln!("Unknown explore tool: '{other}'");
explore_usage();
return Ok(());
}
}
}
requirements::check(task)?;
match (&task.action, &task.target, &task.profile) {
@ -65,6 +94,7 @@ fn run_task(task: &Task) -> Result<(), Error> {
profile = match action {
Action::Run => &Profile::Debug,
Action::Build => &Profile::Release,
Action::Explore(_) => unreachable!(),
}
}
@ -94,6 +124,8 @@ fn run_task(task: &Task) -> Result<(), Error> {
(Action::Build, Target::Cli, Profile::Debug) => run("cargo build -p graphene-cli")?,
(Action::Build, Target::Cli, Profile::Release | Profile::Default) => run("cargo build -r -p graphene-cli")?,
(Action::Explore(_), _, _) => unreachable!(),
}
Ok(())
}

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@ -166,7 +166,7 @@ Adam is a pragmatic problem solver with a talent for simplifying complexity. He
</section>
<section>
<div class="triptych">
<div class="triptych" id="extras">
<div class="block">

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@ -3,31 +3,103 @@ title = "Debugging tips"
[extra]
order = 2 # Page number after chapter intro
css = ["/page/contributor-guide/bisect-tool.css"]
js = ["/js/page/contributor-guide/bisect-tool.js"]
+++
The Wasm-based editor has some unique limitations about how you are able to debug it. This page offers tips and best practices to get the most out of your problem-solving efforts.
## Comparing with deployed builds
When tracking down a bug, first check if the issue you are noticing also exists in `master` or just in your branch. Open up [dev.graphite.art](https://dev.graphite.art) which always deploys the lastest commit, as opposed to [editor.graphite.art](https://editor.graphite.art) which deploys the latest stable release. Build links for any commit may be found by clicking the "comment" icon on the right side of any commit in the [GitHub repo commits list](https://github.com/GraphiteEditor/Graphite/commits/master/).
When tracking down a bug, first check if the issue you are noticing also exists in `master` or just in your branch. Open up [dev.graphite.art](https://dev.graphite.art) which always deploys the lastest commit, as opposed to [editor.graphite.art](https://editor.graphite.art) which deploys the latest stable release. Build links for any commit may be found by clicking the "comment" icon on the right side of any commit in the GitHub repo [commits list](https://github.com/GraphiteEditor/Graphite/commits/master/).
Use *Help* > *About Graphite* in the editor to view any build's Git commit hash.
Use *Help* > *About Graphite* in the editor to view any build's Git commit hash.
Beware of one potential pitfall: all deploys and build links are built with release optimizations enabled. This means some bugs (like crashes from bounds checks or debug assertions) may exist in `master` and would appear if run locally, but not in the deployed version.
Beware of a potential pitfall: all deploys and build links are built with release optimizations enabled. This means some bugs (like crashes from bounds checks or debug assertions) may exist in `master` and would appear if run locally, but not in the deployed version.
## Build bisect tool
```sh
# Access this quickly in the future:
cargo run explore bisect
```
This interactive tool helps you binary search through recent commits, test the build links of each, and pinpoint which change introduced a regression or added a feature.
<div class="bisect-tool">
<div class="phase active" data-phase="setup">
<div class="setup-section">
<div class="section-label">
<span><strong>What are you looking for?</strong></span>
</div>
<label>
<input type="radio" name="bisect-mode" value="regression" checked />
<span>Find when a regression or bug started</span>
</label>
<label>
<input type="radio" name="bisect-mode" value="feature" />
<span>Find when a feature was added or fixed</span>
</label>
</div>
<div class="setup-section">
<div class="section-label">
<span><strong>When do you estimate this changed?</strong></span>
</div>
<label>
<input type="radio" name="start-method" value="date" checked />
<span>Date</span>
</label>
<label>
<input type="radio" name="start-method" value="hash" />
<span>Commit</span>
</label>
</div>
<div class="commit-inputs">
<div class="start-input" data-input="date">
<input type="date" data-commit-date />
</div>
<div class="start-input hidden" data-input="hash">
<input data-commit-hash placeholder="Commit hash" pattern="[0-9a-fA-F]{7,40}" />
</div>
<span class="button arrow" data-start-button>Begin bisect</span>
</div>
</div>
<div class="phase" data-phase="bisect">
<div class="block feature-box-narrow">
<div class="step-header">
<span class="step-label" data-step-label><strong>Bisect step 1</strong></span>
<span class="go-back hidden" data-go-back-button>(<a>go back</a>)</span>
</div>
<div class="progress-info" data-progress-info></div>
<div class="commit-info" data-commit-info></div>
<span class="button arrow" data-test-build-button>Test this build</span>
<span class="findings">After testing, what have you found?</span>
<div class="bisect-actions">
<span class="button" data-issue-present-button></span>
<span class="button" data-issue-absent-button></span>
</div>
</div>
</div>
<div class="error-message" data-message-box></div>
</div>
## Printing to the console
Use the browser console (<kbd>F12</kbd>) to check for warnings and errors. Use the Rust macro `debug!("The number is {}", some_number);` to print to the browser console. These statements should be for temporary debugging. Remove them before your code is reviewed. Print-based debugging is necessary because breakpoints are not supported in WebAssembly.
Use the browser console (<kbd>F12</kbd>) to check for warnings and errors. In Rust, use `log::debug!("The number is {some_number}");` to print to the browser console. These statements should be for temporary debugging. Remove them before your code is reviewed. Print-based debugging is necessary because breakpoints are not supported in WebAssembly.
Additional print statements are available that *should* be committed:
- `error!()` is for descriptive user-facing error messages arising from a bug
- `warn!()` is for non-critical problems that likely indicate a bug somewhere
- `trace!()` is for verbose logs of ordinary internal activity, hidden by default but viewable by activating *Help* > *Debug: Print Trace Logs*
- `log::error!()` is for descriptive user-facing error messages arising from a bug
- `log::warn!()` is for non-critical problems that likely indicate a bug somewhere
- `log::trace!()` is for verbose logs of ordinary internal activity, hidden by default but viewable by activating *Help* > *Debug: Print Trace Logs*
## Message system logs
To also view logs of the messages dispatched by the message system, activate *Help* > *Debug: Print Messages* > *Only Names*. Or use *Full Contents* for a more verbose view containing the actual data being passed. This is an invaluable window into the activity of the message flow and works well together with `debug!()` printouts for tracking down message-related defects.
To also view logs of the messages dispatched by the message system, activate *Help* > *Debug: Print Messages* > *Only Names*. Or use *Full Contents* for a more verbose view containing the actual data being passed. This is an invaluable window into the activity of the message flow and works well together with `log::debug!()` printouts for tracking down message-related defects.
## Node/layer and document IDs

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@ -17,7 +17,12 @@ The dispatcher lives at the root of the editor hierarchy and acts as the owner o
## Editor outline
Click to explore the outline of the editor subsystem hierarchy which forms the structure of the editor's subsystems, state, and interactions. Bookmark this page to reference it later.
```sh
# Access this quickly in the future:
cargo run explore editor
```
Click to explore the outline of the editor subsystem hierarchy which forms the structure of the editor's subsystems, state, and interactions.
<div class="structure-outline">
<!-- replacements::hierarchical_message_system_tree() -->

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@ -13,7 +13,7 @@ Please ensure Clippy is enabled. This should be set up automatically in VS Code.
## Naming
Please use descriptive variable/function/symbol names and keep abbreviations to a minimum. Prefer spelling out full words most of the time, so `gen_doc_fmt` should be written out as `generate_document_format` instead.
Please use descriptive variable/function/symbol names and keep abbreviations to a minimum. Prefer spelling out full words most of the time, such as `generate_document_format` instead of `gen_doc_fmt`.
This avoids the mental burden of expanding abbreviations into semantic meaning. Monitors are wide enough to display long variable/function names, so descriptive is better than cryptic.

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@ -45,3 +45,7 @@
}
}
}
#extras .button {
margin-top: 0;
}

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@ -0,0 +1,139 @@
.bisect-tool {
margin-top: 20px;
.phase:not(.active) {
display: none;
}
.setup-section {
margin-bottom: 20px;
label {
display: block;
cursor: pointer;
}
}
.commit-inputs {
display: flex;
gap: 20px;
flex-wrap: wrap;
align-items: center;
.start-input {
margin: 0;
input {
background: none;
height: calc(var(--font-size-link) * 2);
font-size: calc(var(--font-size-link) * 0.9);
padding: 0 var(--font-size-link);
margin: 0;
outline: none;
color: inherit;
border: var(--border-thickness) solid currentColor;
border-radius: 0;
font-family: inherit;
font-weight: inherit;
box-sizing: border-box;
&:focus {
border-color: var(--color-ale);
}
}
input:not([type="date"]) {
font-family: monospace;
width: 320px;
max-width: 100%;
}
&.hidden {
display: none;
}
}
}
.button,
.link {
cursor: pointer;
user-select: none;
+ .button {
margin-left: 10px;
}
&.disabled {
opacity: 0.4;
pointer-events: none;
}
}
.feature-box-narrow {
padding: calc(var(--feature-box-padding) / 2 * var(--variable-px));
background: var(--color-fog);
border-radius: 2px;
box-sizing: border-box;
.step-label {
font-size: 1rem;
}
.go-back {
margin-left: 4px;
&.hidden {
display: none;
}
a {
text-decoration: underline;
cursor: pointer;
}
}
.progress-info {
color: var(--color-storm);
}
.commit-info {
margin-top: 40px;
a {
font-family: monospace;
color: var(--color-crimson);
}
}
.button.arrow {
margin-top: 20px;
}
.findings {
margin-top: 40px;
}
.bisect-actions {
display: flex;
gap: 8px;
flex-wrap: wrap;
align-items: center;
margin-top: 20px;
.button:empty {
visibility: hidden;
}
}
}
.error-message {
display: none;
margin-top: 20px;
padding: 10px 20px;
background: var(--color-lemon);
&.visible {
display: block;
}
}
}

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@ -0,0 +1,586 @@
document.addEventListener("DOMContentLoaded", () => {
const REPO = "GraphiteEditor/Graphite";
const API = "https://api.github.com";
// =========
// API LAYER
// =========
const cache = new Map();
let rateLimitRemaining = -1;
let rateLimitReset = 0;
async function fetchJSON(/** @type {string} */ url) {
if (cache.has(url)) return cache.get(url);
const response = await fetch(url);
// Track rate limit
const remaining = response.headers.get("X-RateLimit-Remaining");
const reset = response.headers.get("X-RateLimit-Reset");
if (remaining) rateLimitRemaining = parseInt(remaining);
if (reset) rateLimitReset = parseInt(reset);
updateRateLimitWarning();
if (response.status === 404) {
cache.set(url, undefined);
return undefined;
}
if (response.status === 403) {
const resetTime = rateLimitReset ? new Date(rateLimitReset * 1000).toLocaleTimeString() : undefined;
const suffix = resetTime ? ` Resets at ${resetTime}.` : "";
throw new Error(`GitHub API rate limit exceeded.${suffix}`);
}
if (!response.ok) {
const body = await response.json().catch(() => undefined);
throw new Error(body?.message || `GitHub API error: ${response.status} ${response.statusText}`);
}
const data = await response.json();
cache.set(url, data);
return data;
}
async function fetchCommitList(/** @type {string | undefined} */ since, /** @type {string | undefined} */ until, /** @type {number | undefined} */ page) {
let url = `${API}/repos/${REPO}/commits?sha=master&per_page=100`;
if (since) url += `&since=${since}`;
if (until) url += `&until=${until}`;
if (page && page > 1) url += `&page=${page}`;
return fetchJSON(url);
}
async function fetchDeployUrl(/** @type {string} */ sha) {
const comments = await fetchJSON(`${API}/repos/${REPO}/commits/${sha}/comments`);
if (!comments || !Array.isArray(comments)) return undefined;
// Find bot comments, use the last one
const botComments = comments.filter((c) => c.user && c.user.login === "github-actions[bot]");
if (botComments.length === 0) return undefined;
const lastComment = botComments[botComments.length - 1];
const match = lastComment.body.match(/\|\s*(https:\/\/[^\s|]+)\s*\|/);
return match ? match[1] : undefined;
}
// ==============
// DOM REFERENCES
// ==============
const tool = document.querySelector(".bisect-tool");
if (!tool) return;
const phases = {
// eslint-disable-next-line quotes
setup: tool.querySelector('[data-phase="setup"]'),
// eslint-disable-next-line quotes
bisect: tool.querySelector('[data-phase="bisect"]'),
};
const elements = {
messageBox: tool.querySelector("[data-message-box]"),
hashInput: tool.querySelector("[data-input='hash']"),
dateInput: tool.querySelector("[data-input='date']"),
commitHash: tool.querySelector("[data-commit-hash]"),
commitDate: tool.querySelector("[data-commit-date]"),
startButton: tool.querySelector("[data-start-button]"),
stepLabel: tool.querySelector("[data-step-label]"),
commitInfo: tool.querySelector("[data-commit-info]"),
progressInfo: tool.querySelector("[data-progress-info]"),
testBuildButton: tool.querySelector("[data-test-build-button]"),
issuePresentButton: tool.querySelector("[data-issue-present-button]"),
issueAbsentButton: tool.querySelector("[data-issue-absent-button]"),
goBackButton: tool.querySelector("[data-go-back-button]"),
findings: tool.querySelector(".findings"),
bisectActions: tool.querySelector(".bisect-actions"),
};
// =====
// STATE
// =====
/**
* @typedef {{ sha: string, date: Date, message: string }} Commit
* @typedef {{ goodIndex: number, badIndex: number, currentIndex: number, stepCount: number, bisectPhase: string, boundaryOffset: number, boundarySearching: boolean }} HistorySnapshot
*/
let mode = "regression"; // "regression" or "feature"
let /** @type {Commit[]} */ commits = []; // Ordered oldest-first
let goodIndex = -1; // Index where issue is absent (older side)
let badIndex = -1; // Index where issue is present (newer side)
let currentIndex = -1;
let /** @type {string | undefined} */ currentDeployUrl;
let stepCount = 0;
let /** @type {HistorySnapshot[]} */ history = []; // Snapshots for undo
let bisectPhase = "boundary"; // "boundary" or "binary"
let boundaryOffset = 1; // For exponential boundary search
let boundarySearching = false; // Whether we're in exponential backward search
let startIndex = -1; // Where user started
// =======
// HELPERS
// =======
function commitToHtml(/** @type {Commit} */ commit) {
const shortHash = (/** @type {string} */ sha) => sha.slice(0, 7);
const commitUrl = (/** @type {string} */ sha) => `https://github.com/${REPO}/commit/${sha}`;
const hash = `<a href="${commitUrl(commit.sha)}" target="_blank" rel="noopener">${shortHash(commit.sha)}</a>`;
const date = commit.date.toISOString().slice(0, 10);
const message = messageToHtml(commit.message);
return `<strong>${hash}</strong> (${date}): ${message}`;
}
function messageToHtml(/** @type {string} */ message) {
if (!message) return "";
const escaped = message.replace(/&/g, "&amp;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
const prMatch = message.match(/\(#(\d+)\)$/);
if (prMatch) return escaped.replace(`(#${prMatch[1]})`, `(<a href="https://github.com/${REPO}/pull/${prMatch[1]}" target="_blank" rel="noopener">#${prMatch[1]}</a>)`);
return escaped;
}
function parseCommits(/** @type {any[]} */ apiCommits) {
return apiCommits.map((/** @type {any} */ c) => ({
sha: c.sha,
date: new Date(c.commit.committer.date),
message: c.commit.message.split("\n")[0],
}));
}
function setDisabled(/** @type {Element | null} */ element, /** @type {boolean} */ disabled) {
element?.classList.toggle("disabled", disabled);
}
function isDisabled(/** @type {Element | null} */ element) {
return element?.classList.contains("disabled") ?? false;
}
function showPhase(/** @type {string} */ name) {
Object.entries(phases).forEach(([key, phase]) => {
phase?.classList.toggle("active", key === name);
});
}
function showMessage(/** @type {string} */ html) {
if (elements.messageBox) elements.messageBox.innerHTML = html;
elements.messageBox?.classList.add("visible");
}
function hideMessage() {
elements.messageBox?.classList.remove("visible");
}
function updateRateLimitWarning() {
if (rateLimitRemaining >= 0 && rateLimitRemaining < 15) {
const resetTime = rateLimitReset ? new Date(rateLimitReset * 1000).toLocaleTimeString() : "unknown";
const plural = rateLimitRemaining === 1 ? "" : "s";
showMessage(`<strong>API rate limit:</strong> ${rateLimitRemaining} request${plural} remaining. Resets at ${resetTime}.`);
}
}
// ======================
// COMMIT LIST MANAGEMENT
// ======================
async function loadCommitsAroundDate(/** @type {Date} */ targetDate) {
const windowDays = 30;
const since = new Date(targetDate.getTime() - windowDays * 24 * 60 * 60 * 1000).toISOString();
const until = new Date(targetDate.getTime() + windowDays * 24 * 60 * 60 * 1000).toISOString();
// Paginate to load all commits in the window (API returns max 100 per page)
let /** @type {any[]} */ allRaw = [];
let page = 1;
while (true) {
const raw = await fetchCommitList(since, until, page);
if (!raw || raw.length === 0) break;
allRaw = allRaw.concat(raw);
if (raw.length < 100) break;
page++;
}
if (allRaw.length === 0) {
throw new Error("No commits found near that date. Try a different date.");
}
// GitHub returns newest-first, reverse to oldest-first
const fetched = parseCommits(allRaw);
fetched.reverse();
commits = fetched;
}
async function extendCommitsBackward() {
if (commits.length === 0) return false;
const oldest = commits[0];
const until = new Date(oldest.date.getTime() - 1000).toISOString();
const raw = await fetchCommitList(undefined, until, undefined);
if (!raw || raw.length === 0) return false;
let fetched = parseCommits(raw);
fetched.reverse();
const existingShas = new Set(commits.map((c) => c.sha));
fetched = fetched.filter((c) => !existingShas.has(c.sha));
if (fetched.length === 0) return false;
commits = [...fetched, ...commits];
// Adjust indices to account for prepended commits
const shift = fetched.length;
if (goodIndex >= 0) goodIndex += shift;
if (badIndex >= 0) badIndex += shift;
if (currentIndex >= 0) currentIndex += shift;
if (startIndex >= 0) startIndex += shift;
return true;
}
function findCommitIndex(/** @type {string} */ sha) {
return commits.findIndex((c) => c.sha.startsWith(sha) || sha.startsWith(c.sha));
}
// ============
// BISECT LOGIC
// ============
function pushHistory() {
history.push({
goodIndex,
badIndex,
currentIndex,
stepCount,
bisectPhase,
boundaryOffset,
boundarySearching,
});
elements.goBackButton?.classList.remove("hidden");
}
function popHistory() {
const snap = history.pop();
if (!snap) return;
goodIndex = snap.goodIndex;
badIndex = snap.badIndex;
currentIndex = snap.currentIndex;
stepCount = snap.stepCount;
bisectPhase = snap.bisectPhase;
boundaryOffset = snap.boundaryOffset;
boundarySearching = snap.boundarySearching;
elements.goBackButton?.classList.remove("hidden");
}
async function presentCommit(/** @type {number} */ index) {
currentIndex = index;
const commit = commits[index];
const deployUrl = await fetchDeployUrl(commit.sha);
currentDeployUrl = deployUrl;
if (elements.stepLabel) elements.stepLabel.innerHTML = `<strong>Bisect step ${stepCount + 1}</strong>`;
if (elements.commitInfo) {
elements.commitInfo.innerHTML = commitToHtml(commit);
}
if (goodIndex >= 0 && badIndex >= 0) {
const remaining = badIndex - goodIndex;
const stepsLeft = Math.max(1, Math.ceil(Math.log2(remaining)));
if (elements.progressInfo) {
elements.progressInfo.innerHTML = `<em>${remaining} commit${remaining === 1 ? "" : "s"} in range, ~${stepsLeft} step${stepsLeft === 1 ? "" : "s"} remaining</em>`;
}
} else {
if (elements.progressInfo) elements.progressInfo.innerHTML = "<em>Locating starting point</em>";
}
if (deployUrl) {
setDisabled(elements.testBuildButton, false);
if (elements.testBuildButton) elements.testBuildButton.textContent = "Test this build";
} else {
setDisabled(elements.testBuildButton, true);
if (elements.testBuildButton) elements.testBuildButton.textContent = "No build available";
}
// Set mode-specific button labels
if (mode === "regression") {
if (elements.issuePresentButton) elements.issuePresentButton.textContent = "Regression is present";
if (elements.issueAbsentButton) elements.issueAbsentButton.textContent = "Regression is absent";
} else {
if (elements.issuePresentButton) elements.issuePresentButton.textContent = "Feature is present";
if (elements.issueAbsentButton) elements.issueAbsentButton.textContent = "Feature is absent";
}
}
async function handleUserResponse(/** @type {boolean} */ issuePresent) {
pushHistory();
stepCount++;
if (bisectPhase === "boundary") {
await handleBoundaryResponse(issuePresent);
return;
}
// Binary search: narrow the range
if (issuePresent) badIndex = currentIndex;
else goodIndex = currentIndex;
if (badIndex - goodIndex <= 1) showResult();
else await doBinaryStep();
}
async function handleBoundaryResponse(/** @type {boolean} */ issuePresent) {
// "present" means the feature/regression exists at this commit (bad/newer side)
if (!boundarySearching) {
// First step: user tested the starting commit
if (issuePresent) {
// Exists at starting commit, so it was introduced earlier. Search backward (doubling).
badIndex = currentIndex;
boundarySearching = true;
} else {
// Absent at starting commit. The newest commit should have it (user assumes master has it).
goodIndex = currentIndex;
badIndex = commits.length - 1;
bisectPhase = "binary";
}
} else if (issuePresent) {
badIndex = currentIndex;
boundaryOffset *= 2;
} else {
goodIndex = currentIndex;
bisectPhase = "binary";
}
if (bisectPhase === "binary") {
await doBinaryStep();
return;
}
// Continue boundary search backward
await doBoundaryStep();
}
async function doBoundaryStep() {
let targetIndex = startIndex - boundaryOffset;
while (targetIndex < 0) {
const extended = await extendCommitsBackward();
if (!extended) {
targetIndex = 0;
break;
}
targetIndex = startIndex - boundaryOffset;
}
// If we've hit the oldest commit and it's still marked bad, we've exhausted history
if (targetIndex <= 0 && badIndex === 0) {
showResult();
// Override the result message — we never confirmed a good baseline, so we can't pinpoint the introducing commit
if (elements.progressInfo) {
const label = mode === "regression" ? "regression" : "feature";
elements.progressInfo.innerHTML = `<em>The ${label} was already present in the oldest available commit</em>`;
}
return;
}
await presentCommit(targetIndex);
}
async function doBinaryStep() {
const mid = Math.floor((goodIndex + badIndex) / 2);
// Try to find a testable commit near the midpoint
let testIndex = mid;
let offset = 0;
while (testIndex > goodIndex && testIndex < badIndex) {
const url = await fetchDeployUrl(commits[testIndex].sha);
if (url) break;
// Try alternating sides
offset++;
if (offset % 2 === 1) testIndex = mid + Math.ceil(offset / 2);
else testIndex = mid - Math.ceil(offset / 2);
}
// If no testable commit found in range, show result as a range
if (testIndex <= goodIndex || testIndex >= badIndex) {
showResult();
return;
}
await presentCommit(testIndex);
}
function showResult() {
const heading = "Bisect complete";
// Hide interactive elements, keep the bisect phase visible
if (elements.progressInfo) elements.progressInfo.innerHTML = "";
setDisabled(elements.testBuildButton, true);
if (elements.testBuildButton instanceof HTMLElement) elements.testBuildButton.style.display = "none";
if (elements.findings instanceof HTMLElement) elements.findings.style.display = "none";
if (elements.bisectActions instanceof HTMLElement) elements.bisectActions.style.display = "none";
if (history.length > 0) elements.goBackButton?.classList.remove("hidden");
const label = mode === "regression" ? "regression" : "feature";
const single = badIndex - goodIndex <= 1;
if (elements.stepLabel) elements.stepLabel.innerHTML = `<strong>${heading}</strong>`;
if (elements.progressInfo) {
elements.progressInfo.innerHTML = single
? `<em>The ${label} was introduced in the following commit</em>`
: `<em>The ${label} was introduced in one of the following commits (not all have build links)</em>`;
}
const start = single ? badIndex : goodIndex + 1;
let html = "";
for (let i = start; i <= badIndex; i++) {
const c = commits[i];
html += single ? `${commitToHtml(c)}` : `<div>${commitToHtml(c)}</div>`;
}
if (elements.commitInfo) elements.commitInfo.innerHTML = html;
}
// ==============
// EVENT HANDLERS
// ==============
// Toggle start input visibility
function syncStartInputVisibility() {
// eslint-disable-next-line quotes
const selected = tool?.querySelector('input[name="start-method"]:checked');
const method = selected instanceof HTMLInputElement ? selected.value : "date";
elements.hashInput?.classList.toggle("hidden", method !== "hash");
elements.dateInput?.classList.toggle("hidden", method !== "date");
}
syncStartInputVisibility();
// eslint-disable-next-line quotes
tool.querySelectorAll('input[name="start-method"]').forEach((radio) => {
radio.addEventListener("change", syncStartInputVisibility);
});
// Start bisect
elements.startButton?.addEventListener("click", async () => {
if (isDisabled(elements.startButton)) return;
hideMessage();
// eslint-disable-next-line quotes
const modeInput = tool.querySelector('input[name="bisect-mode"]:checked');
// eslint-disable-next-line quotes
const methodInput = tool.querySelector('input[name="start-method"]:checked');
if (!(modeInput instanceof HTMLInputElement) || !(methodInput instanceof HTMLInputElement)) return;
mode = modeInput.value;
const method = methodInput.value;
try {
setDisabled(elements.startButton, true);
if (method === "hash") {
const hash = elements.commitHash instanceof HTMLInputElement ? elements.commitHash.value.trim() : "";
if (!/^[0-9a-fA-F]{7,40}$/.test(hash)) {
throw new Error("Please enter a valid commit hash (7-40 hex characters).");
}
// Fetch the commit to get its date
const commitData = await fetchJSON(`${API}/repos/${REPO}/commits/${hash}`);
if (!commitData) {
throw new Error("Commit not found. Check the hash and try again.");
}
const commitDate = new Date(commitData.commit.committer.date);
await loadCommitsAroundDate(commitDate);
startIndex = findCommitIndex(hash);
if (startIndex < 0) {
throw new Error("Commit not found in the master branch history.");
}
} else {
const dateStr = elements.commitDate instanceof HTMLInputElement ? elements.commitDate.value : "";
if (!dateStr) {
throw new Error("Please select a date.");
}
const date = new Date(dateStr + "T12:00:00Z");
if (date > new Date()) {
throw new Error("Date cannot be in the future.");
}
await loadCommitsAroundDate(date);
// Find the commit closest to the selected date
let closestIndex = 0;
let closestDiff = Infinity;
for (let i = 0; i < commits.length; i++) {
const diff = Math.abs(commits[i].date.getTime() - date.getTime());
if (diff < closestDiff) {
closestDiff = diff;
closestIndex = i;
}
}
startIndex = closestIndex;
}
// Reset state
goodIndex = -1;
badIndex = -1;
currentIndex = -1;
currentDeployUrl = undefined;
stepCount = 0;
history = [];
bisectPhase = "boundary";
boundaryOffset = 1;
boundarySearching = false;
elements.goBackButton?.classList.remove("hidden");
if (elements.testBuildButton instanceof HTMLElement) elements.testBuildButton.style.display = "";
if (elements.findings instanceof HTMLElement) elements.findings.style.display = "";
if (elements.bisectActions instanceof HTMLElement) elements.bisectActions.style.display = "";
// Show bisect phase and present the starting commit
showPhase("bisect");
await presentCommit(startIndex);
} catch (err) {
if (err instanceof Error) showMessage(err.message);
} finally {
setDisabled(elements.startButton, false);
}
});
// Test build button
elements.testBuildButton?.addEventListener("click", () => {
if (isDisabled(elements.testBuildButton)) return;
if (currentDeployUrl) {
window.open(currentDeployUrl, "_blank", "noopener");
}
});
// Issue response buttons
function onIssueResponse(/** @type {Element | null} */ button, /** @type {boolean} */ issuePresent) {
button?.addEventListener("click", async () => {
if (isDisabled(button)) return;
hideMessage();
try {
await handleUserResponse(issuePresent);
} catch (err) {
if (err instanceof Error) showMessage(err.message);
}
});
}
onIssueResponse(elements.issuePresentButton, true);
onIssueResponse(elements.issueAbsentButton, false);
// Go back
elements.goBackButton?.querySelector("a")?.addEventListener("click", async () => {
hideMessage();
if (history.length === 0) {
showPhase("setup");
return;
}
// Restore interactive elements that may have been hidden by showResult
if (elements.testBuildButton instanceof HTMLElement) elements.testBuildButton.style.display = "";
if (elements.findings instanceof HTMLElement) elements.findings.style.display = "";
if (elements.bisectActions instanceof HTMLElement) elements.bisectActions.style.display = "";
popHistory();
await presentCommit(currentIndex);
});
});