init

Signed-off-by: Muthu Kumar <muthukumar@thefeathers.in>

Author: MKRhere

.prettierrc

@@ -0,0 +1,12 @@
+{
+	"trailingComma": "all",
+	"useTabs": true,
+	"semi": true,
+	"singleQuote": false,
+	"quoteProps": "consistent",
+	"jsxSingleQuote": false,
+	"bracketSpacing": true,
+	"jsxBracketSameLine": true,
+	"arrowParens": "avoid",
+	"printWidth": 80
+}

package.json

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+{
+	"name": "nyc-diff",
+	"version": "0.0.1",
+	"description": "Report coverage for changed lines from a unified diff",
+	"main": "index.js",
+	"scripts": {
+		"test": "echo \"Error: no test specified\" && exit 1"
+	},
+	"keywords": [],
+	"author": "MKRhere <@MKRhere> (https://mkr.pw)",
+	"contributors": [
+		"Shashank Kaul"
+	],
+	"license": "MIT"
+}

tools/diff-line-numbers.js

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+module.exports = (inputStream, outputStream) => {
+	const state = {
+		watch: false,
+		curr: {
+			src: 0,
+			dest: 0,
+		},
+	};
+
+	const write = (...segs) => outputStream.write(segs.join("") + "\n");
+
+	const convertAndLog = {
+		src: line => {
+			write(String(state.curr.src).padEnd(4, " "), ":", line);
+			++state.curr.src;
+		},
+		dest: line => {
+			write(String(state.curr.dest).padEnd(4, " "), ":", line);
+			++state.curr.dest;
+		},
+		neutral: line => {
+			write(String(state.curr.dest).padEnd(4, " "), ":", line);
+			++state.curr.dest;
+			++state.curr.src;
+		},
+	};
+
+	inputStream.on("data", data => {
+		const lines = String(data).split("\n");
+		lines.forEach(line => {
+			if (line.startsWith("@@")) {
+				const [src, dest] = line
+					.split(" ")
+					.filter(x => x !== "@@")
+					// Remove +, -
+					.map(x => x.slice(1))
+					// Split to components
+					.map(x => x.split(","))
+					// parse as Number
+					.map(([start, end]) => ({
+						start: Number(start),
+						end: Number(end),
+					}));
+				state.watch = true;
+				// Reset counter to reflect current context
+				Object.assign(state.curr, { src: src.start, dest: dest.start });
+				return write(line);
+			} else if (state.watch) {
+				if (line.startsWith(" ")) {
+					convertAndLog.neutral(line);
+				}
+				if (line.startsWith("+")) {
+					convertAndLog.dest(line);
+				}
+				if (line.startsWith("-")) {
+					convertAndLog.src(line);
+				}
+				if (line.startsWith("diff")) {
+					state.watch = false;
+					write(line);
+				}
+			} else write(line);
+		});
+	});
+
+	inputStream.on("end", () => outputStream.end());
+};