Filter changed files

README.md

@@ -28,6 +28,15 @@ The location of the lcov file to read the coverage report from. Defaults to
 The location of the lcov file resulting from running the tests in the base
 branch. When this is set a diff of the coverage percentages is shown.
 
+##### `filter-changed-files` (**Default: false**)
+If set to true, only changed files will be included in the report. Total percentage will still include all files.
+
+##### `delete-old-comments` (**Default: false**)
+If set to true, old comments will be deleted before a new comment is posted
+
+##### `title` (**Optional**)
+If included, will be added as a title for the comment produced.
+
 ## Example usage
 
 ```yml
@@ -39,3 +48,5 @@ with:
 ## Acknowledgements
 
 The initial code is based on [ziishaned/jest-reporter-action](https://github.com/ziishaned/jest-reporter-action).
+
+Changed file retrieval based on [jitterbit/get-changed-files](https://github.com/jitterbit/get-changed-files).

action.yml

@@ -15,6 +15,17 @@ inputs:
   lcov-base:
     description: The location of the lcov file for the base branch
     required: false
+  filter-changed-files:
+    description: Set to true to only comment with coverage on files changed in this commit
+    required: false
+    default: false
+  delete-old-comments:
+    description: Set to true to delete old Coverage Report comments
+    required: false
+    default: false
+  title:
+    description: Title to add to the comment
+    required: false
 runs:
   using: node12
   main: dist/main.js

dist/main.js

@@ -22784,11 +22784,16 @@ const b = tag("b");
 const table = tag("table");
 const tbody = tag("tbody");
 const a = tag("a");
+const h2 = tag("h2");
 
 const fragment = function(...children) {
 	return children.join("")
 };
 
+function normalisePath(file) {
+	return file.replace(/\\/g, "/")
+}
+
 // Tabulate the lcov data in a HTML table.
 function tabulate(lcov, options) {
 	const head = tr(
@@ -22801,7 +22806,7 @@ function tabulate(lcov, options) {
 	);
 
 	const folders = {};
-	for (const file of lcov) {
+	for (const file of filterAndNormaliseLcov(lcov, options)) {
 		const parts = file.file.replace(options.prefix, "").split("/");
 		const folder = parts.slice(0, -1).join("/");
 		folders[folder] = folders[folder] || [];
@@ -22822,6 +22827,23 @@ function tabulate(lcov, options) {
 	return table(tbody(head, ...rows))
 }
 
+function filterAndNormaliseLcov(lcov, options) {
+	return lcov
+		.map(file => ({
+			...file,
+			file: normalisePath(file.file)
+		}))
+		.filter(file =>
+			shouldBeIncluded(file.file, options))
+}
+
+function shouldBeIncluded(fileName, options) {
+	if (!options.shouldFilterChangedFiles) {
+		return true
+	}
+	return options.changedFiles.includes(fileName.replace(options.prefix, ""));
+}
+
 function toFolder(path) {
 	if (path === "") {
 		return ""
@@ -22833,16 +22855,19 @@ function toFolder(path) {
 function getStatement(file) {
 	const { branches, functions, lines } = file;
 
-	return [branches, functions, lines].reduce(function(acc, curr) {
-		if (!curr) {
-			return acc
-		}
+	return [branches, functions, lines].reduce(
+		function(acc, curr) {
+			if (!curr) {
+				return acc
+			}
 
-		return {
-			hit: acc.hit + curr.hit,
-			found: acc.found + curr.found,
-		}
-	}, { hit: 0, found: 0 })
+			return {
+				hit: acc.hit + curr.hit,
+				found: acc.found + curr.found,
+			}
+		},
+		{ hit: 0, found: 0 },
+	)
 }
 
 function toRow(file, indent, options) {
@@ -22889,13 +22914,18 @@ function uncovered(file, options) {
 
 	const all = ranges([...branches, ...lines]);
 
-
 	return all
 		.map(function(range) {
-			const fragment = range.start === range.end ? `L${range.start}` : `L${range.start}-L${range.end}`;
+			const fragment =
+				range.start === range.end
+					? `L${range.start}`
+					: `L${range.start}-L${range.end}`;
 			const relative = file.file.replace(options.prefix, "");
 			const href = `https://github.com/${options.repository}/blob/${options.commit}/${relative}#${fragment}`;
-			const text = range.start === range.end ? range.start : `${range.start}–${range.end}`;
+			const text =
+				range.start === range.end
+					? range.start
+					: `${range.start}–${range.end}`;
 
 			return a({ href }, text)
 		})
@@ -22929,14 +22959,24 @@ function ranges(linenos) {
 	return res
 }
 
-function comment (lcov, options) {
+function comment(lcov, options) {
 	return fragment(
+		options.title ? h2(options.title) : "",
 		options.base
-			? `Coverage after merging ${b(options.head)} into ${b(options.base)}`
+			? `Coverage after merging ${b(options.head)} into ${b(
+					options.base,
+			  )} will be`
 			: `Coverage for this commit`,
 		table(tbody(tr(th(percentage(lcov).toFixed(2), "%")))),
 		"\n\n",
-		details(summary("Coverage Report"), tabulate(lcov, options)),
+		details(
+			summary(
+				options.shouldFilterChangedFiles
+					? "Coverage Report for Changed Files"
+					: "Coverage Report",
+			),
+			tabulate(lcov, options),
+		),
 	)
 }
 
@@ -22949,73 +22989,173 @@ function diff(lcov, before, options) {
 	const pafter = percentage(lcov);
 	const pdiff = pafter - pbefore;
 	const plus = pdiff > 0 ? "+" : "";
-	const arrow =
-		pdiff === 0
-			? ""
-			: pdiff < 0
-				? "▾"
-				: "▴";
+	const arrow = pdiff === 0 ? "" : pdiff < 0 ? "▾" : "▴";
 
 	return fragment(
+		options.title ? h2(options.title) : "",
 		options.base
-			? `Coverage after merging ${b(options.head)} into ${b(options.base)}`
+			? `Coverage after merging ${b(options.head)} into ${b(
+					options.base,
+			  )} will be`
 			: `Coverage for this commit`,
-		table(tbody(tr(
-			th(pafter.toFixed(2), "%"),
-			th(arrow, " ", plus, pdiff.toFixed(2), "%"),
-		))),
+		table(
+			tbody(
+				tr(
+					th(pafter.toFixed(2), "%"),
+					th(arrow, " ", plus, pdiff.toFixed(2), "%"),
+				),
+			),
+		),
 		"\n\n",
-		details(summary("Coverage Report"), tabulate(lcov, options)),
+		details(
+			summary(
+				options.shouldFilterChangedFiles
+					? "Coverage Report for Changed Files"
+					: "Coverage Report",
+			),
+			tabulate(lcov, options),
+		),
+	)
+}
+
+// Get list of changed files
+async function getChangedFiles(githubClient, options, context) {
+	if (!options.commit || !options.baseCommit) {
+		core_7(
+			`The base and head commits are missing from the payload for this ${context.eventName} event.`,
+		);
+	}
+
+	// Use GitHub's compare two commits API.
+	// https://developer.github.com/v3/repos/commits/#compare-two-commits
+	const response = await githubClient.repos.compareCommits({
+		base: options.baseCommit,
+		head: options.commit,
+		owner: context.repo.owner,
+		repo: context.repo.repo,
+	});
+
+	if (response.status !== 200) {
+		core_7(
+			`The GitHub API for comparing the base and head commits for this ${context.eventName} event returned ${response.status}, expected 200.`,
+		);
+	}
+
+	return response.data.files
+		.filter(file => file.status == "modified" || file.status == "added")
+		.map(file => file.filename)
+}
+
+const REQUESTED_COMMENTS_PER_PAGE = 20;
+
+async function deleteOldComments(github, options, context) {
+	const existingComments = await getExistingComments(github, options, context);
+	for (const comment of existingComments) {
+		core_8(`Deleting comment: ${comment.id}`);
+		try {
+			await github.issues.deleteComment({
+				owner: context.repo.owner,
+				repo: context.repo.repo,
+				comment_id: comment.id,
+			});
+		} catch (error) {
+			console.error(error);
+		}
+	}
+}
+
+async function getExistingComments(github, options, context) {
+	let page = 0;
+	let results = [];
+	let response;
+	do {
+		response = await github.issues.listComments({
+			issue_number: context.issue.number,
+			owner: context.repo.owner,
+			repo: context.repo.repo,
+			per_page: REQUESTED_COMMENTS_PER_PAGE,
+			page: page,
+		});
+		results = results.concat(response.data);
+		page++;
+	} while (response.data.length === REQUESTED_COMMENTS_PER_PAGE)
+
+	return results.filter(
+		comment =>
+			!!comment.user &&
+            (!options.title || comment.body.includes(options.title)) &&
+			comment.body.includes("Coverage Report"),
 	)
 }
 
+const MAX_COMMENT_CHARS = 65536;
+
 async function main$1() {
 	const token = core$1.getInput("github-token");
+	const githubClient = new github_2(token);
 	const lcovFile = core$1.getInput("lcov-file") || "./coverage/lcov.info";
 	const baseFile = core$1.getInput("lcov-base");
+	const shouldFilterChangedFiles = core$1.getInput("filter-changed-files");
+	const shouldDeleteOldComments = core$1.getInput("delete-old-comments");
+	const title = core$1.getInput("title");
 
 	const raw = await fs.promises.readFile(lcovFile, "utf-8").catch(err => null);
 	if (!raw) {
 		console.log(`No coverage report found at '${lcovFile}', exiting...`);
 		return
 	}
 
-	const baseRaw = baseFile && await fs.promises.readFile(baseFile, "utf-8").catch(err => null);
+	const baseRaw =
+		baseFile && (await fs.promises.readFile(baseFile, "utf-8").catch(err => null));
 	if (baseFile && !baseRaw) {
 		console.log(`No coverage report found at '${baseFile}', ignoring...`);
 	}
 
 	const options = {
 		repository: github_1.payload.repository.full_name,
-		prefix: `${process.env.GITHUB_WORKSPACE}/`,
+		prefix: normalisePath(`${process.env.GITHUB_WORKSPACE}/`),
 	};
 
 	if (github_1.eventName === "pull_request") {
 		options.commit = github_1.payload.pull_request.head.sha;
+		options.baseCommit = github_1.payload.pull_request.base.sha;
 		options.head = github_1.payload.pull_request.head.ref;
 		options.base = github_1.payload.pull_request.base.ref;
 	} else if (github_1.eventName === "push") {
 		options.commit = github_1.payload.after;
+		options.baseCommit = github_1.payload.before;
 		options.head = github_1.ref;
 	}
 
+	options.shouldFilterChangedFiles = shouldFilterChangedFiles;
+	options.title = title;
+
+	if (shouldFilterChangedFiles) {
+		options.changedFiles = await getChangedFiles(githubClient, options, github_1);
+	}
+
 	const lcov = await parse$2(raw);
-	const baselcov = baseRaw && await parse$2(baseRaw);
-	const body = diff(lcov, baselcov, options);
+	const baselcov = baseRaw && (await parse$2(baseRaw));
+	const body = diff(lcov, baselcov, options)
+		.substring(0, MAX_COMMENT_CHARS);
+
+	if (shouldDeleteOldComments) {
+		await deleteOldComments(githubClient, options, github_1);
+	}
 
 	if (github_1.eventName === "pull_request") {
-		await new github_2(token).issues.createComment({
+		await githubClient.issues.createComment({
 			repo: github_1.repo.repo,
 			owner: github_1.repo.owner,
 			issue_number: github_1.payload.pull_request.number,
-			body: diff(lcov, baselcov, options),
+			body: body,
 		});
 	} else if (github_1.eventName === "push") {
-		await new github_2(token).repos.createCommitComment({
+		await githubClient.repos.createCommitComment({
 			repo: github_1.repo.repo,
 			owner: github_1.repo.owner,
 			commit_sha: options.commit,
-			body: diff(lcov, baselcov, options),
+			body: body,
 		});
 	}
 }