keep-a-changelog/src/Change.js

Parse and generate changelogs following the [keepachangelog](https://keepachangelog.com/) format.

export default class Change {
    title;
    description;
    issues = [];
    static extractIssues(text, issues) {
        return text
            .replace(/(^|[^\\])\[#(\d+)\](?=[^\(]|$)/g, (_, start, index) => {
            if (!issues.includes(index)) {
                issues.push(index);
            }
            return `${start}[#${index}]`;
        })
            .replace(/(^|[\s,])#(\d+)(?=[\s,\.]|$)/g, (_, start, index) => {
            if (!issues.includes(index)) {
                issues.push(index);
            }
            return `${start}[#${index}]`;
        });
    }
    constructor(title, description = "") {
        this.title = Change.extractIssues(title, this.issues);
        this.description = Change.extractIssues(description, this.issues);
    }
    toString(bulletStyle = "-") {
        let t = this.title.split("\n").map((line) => `  ${line}`.trimEnd());
        t[0] = bulletStyle + t[0].substr(1);
        if (this.description) {
            t.push("");
            t = t.concat(this.description.split("\n").map((line) => `  ${line}`.trimEnd()));
        }
        return t.join("\n").trim();
    }
}