git-blame-line/lib/index.js

Execute git blame for a single line and get a JSON as result

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.blameLine = void 0;
const exec_promise_1 = require("./exec-promise");
const parse_line_1 = require("./parse-line");
async function blameLine(filepathWithLine) {
    const [filename, lineNumber] = filepathWithLine.split(":");
    // TODO: remove this check and add a regex check at the top.
    if (!lineNumber) {
        throw new Error("Error: filepathWithLine syntax is wrong, you have to pass a single filepath and linenumber seperated with `:` character");
    }
    const gitCommandString = `git blame --line-porcelain -L ${lineNumber},+1 ${filename}`;
    const blameOutput = await exec_promise_1.execPromise(gitCommandString);
    const lineInfos = [];
    const lines = blameOutput.split("\n");
    // * First line is not important so we skip it by starting from second line
    //    <40-byte hex sha1> <sourceline> <resultline> <num_lines>
    // * Last line is empty
    // * Second last line is content of the source code with a /t at the
    //   start of the line
    // So we skip these lines.
    for (let index = 1; index < lines.length - 2; index += 1) {
        const line = lines[index];
        const infoLine = parse_line_1.parseBlameInfoLine(line);
        if (infoLine) {
            lineInfos.push(infoLine);
        }
    }
    const mergedInfo = lineInfos.reduce((prev, current) => { return Object.assign(Object.assign({}, prev), current); }, {});
    mergedInfo.sourceCode = lines[lines.length - 2].replace("\t", "");
    return mergedInfo;
}
exports.blameLine = blameLine;