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import type { Repo } from "./repo.ts";import type { Commit } from "./commits.ts";import type { Tag } from "./tags.ts";
export interface Filter {  type: string;  title: string;}
export const filters: Filter[] = [  {    type: "breaking",    title: "Breaking",  },  {    type: "feat",    title: "Features",  },  {    type: "fix",    title: "Bug Fixes",  },  {    type: "docs",    title: "Docs",  },  {    type: "core",    title: "Core",  },];
export interface Document {  sections: string[];  links: string[];}
// links definition for markdown (they are not inline)export function fmtLink(name: string, to: string): string {  return `[${name}]: ${to}`;}
export function pushHeader(doc: Document): void {  doc.sections.push(`# Changelog
All notable changes to this project will be documented in this file.`);}
export function pushChanges(  doc: Document,  repo: Repo,  title: string,  commits: Commit[],  style: "github" | "md",): void {  doc.sections.push(`### ${title}`);  const list: string[] = [];  for (const commit of commits) {    const { hash } = commit;    const { header } = commit.cc;    const shortid = hash.slice(0, 7);
    if (repo.remote && repo.remote.github && style === "md") {      const { user, name } = repo.remote.github;      let url = `https://github.com/${user}/${name}/`;      url = `${url}commit/${hash}`;
      list.push(`- ${header} ([${shortid}])`);      doc.links.push(fmtLink(shortid, url));    } else {      // on github release we do not need to use url      list.push(`- ${header} (${shortid})`);    }  }  doc.sections.push(list.join("\n"));}
export function pushTag(  doc: Document,  repo: Repo,  commits: Commit[],  filters: Filter[],  tag: Tag,  style: "github" | "md",  parent?: Tag,): void {  const year = tag.date.getUTCFullYear();  const month = String(tag.date.getUTCMonth() + 1).padStart(2, "0");  const day = String(tag.date.getUTCDate()).padStart(2, "0");
  if (repo.remote && repo.remote.github && style === "md") {    const { user, name } = repo.remote.github;    let url = `https://github.com/${user}/${name}/`;
    url = parent      ? `${url}compare/${parent.version}...${tag.version}`      : `${url}compare/${tag.version}`;    doc.links.push(fmtLink(tag.version, url));    doc.sections.push(`## [${tag.version}] - ${year}-${month}-${day}`);  } else {    doc.sections.push(`## ${tag.version} - ${year}-${month}-${day}`);  }
  for (const filter of filters) {    const filtered = commits.filter((_) => _.cc.type === filter.type);    if (filtered.length > 0) {      pushChanges(doc, repo, filter.title, filtered, style);    }  }}
export function render(doc: Document): string {  const sections = doc.sections.join("\n\n");  const links = doc.links.join("\n");  const full = [sections, links];  return `${full.join("\n\n").trim()}\n`;}
export function polyfillVersion(repo: Repo, to: string): [Tag[], Commit[]] {  const newtag: Tag = {    tag: to,    version: to,    date: new Date(),    hash: "",  };  const tags = [newtag, ...repo.tags];  const commits = [...repo.commits];
  for (const commit of commits) {    if (commit.belongs !== null) break;    commit.belongs = newtag;  }
  return [tags, commits];}