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import type { ArchiveYear, PostLike, TagDirectoryGroup, TaxonomyGroup } from "./types";
export type {
ArchiveMonth,
ArchiveYear,
PostLike,
TagDirectoryGroup,
TaxonomyGroup,
} from "./types";
const monthLabels = [
"一月",
"二月",
"三月",
"四月",
"五月",
"六月",
"七月",
"八月",
"九月",
"十月",
"十一月",
"十二月",
];
const asciiLetterPattern = /^[A-Za-z]$/;
const reservedPostSlugPattern = /[/?#%]/u;
const unsafePostFilenamePattern = /[\\:*"<>|]/u;
const windowsReservedPostNamePattern = /^(con|prn|aux|nul|com[1-9]|lpt[1-9])(?:\..*)?$/iu;
function compareTagInitials(a: string, b: string): number {
Iif (a === b) return 0;
Iif (a === "#") return 1;
Iif (b === "#") return -1;
return a.localeCompare(b, "en", { sensitivity: "base" });
}
function getTagSortKey(name: string): string {
return Array.from(name.trim())
.map((char) => {
if (asciiLetterPattern.test(char)) return char.toLowerCase();
const [charPinyin] = pinyin(char, {
toneType: "none",
type: "array",
});
return (charPinyin ?? char).toLowerCase();
})
.join("");
}
export function compareTagNames(a: string, b: string): number {
return (
getTagSortKey(a).localeCompare(getTagSortKey(b), "en", {
sensitivity: "base",
}) || a.localeCompare(b, "zh-CN")
);
}
export function getPostSlug(post: Pick<PostLike, "id" | "data">): string {
const rawTitle = post.data.title;
const slug = rawTitle.trim();
if (!slug) {
throw new Error(`Article title cannot be empty: ${post.id}`);
}
if (reservedPostSlugPattern.test(slug)) {
throw new Error(`Article title cannot contain URL-reserved characters: ${post.id}`);
}
if (
rawTitle !== slug ||
unsafePostFilenamePattern.test(slug) ||
slug === "." ||
slug === ".." ||
/[. ]$/u.test(slug) ||
windowsReservedPostNamePattern.test(slug)
) {
throw new Error(`Article title is not filesystem-safe: ${post.id}`);
}
return slug;
}
const rasterCoverPattern = /\.(webp|png|jpe?g|avif)$/i;
/**
* Cover thumbnails are generated next to the original as `<name>-thumb.webp`
* (build time for production, on-demand by the dev middleware). Non-raster
* covers (SVG/GIF/MP4) have no thumb and keep the original URL.
*/
export function getCoverThumb(cover: string): string {
if (!rasterCoverPattern.test(cover)) return cover;
return cover.replace(rasterCoverPattern, "-thumb.webp");
}
export function validateUniquePostSlugs<TPost extends PostLike>(posts: TPost[]): void {
const seen = new Set<string>();
for (const post of posts) {
const slug = getPostSlug(post);
if (seen.has(slug)) {
throw new Error(`Duplicate article slug: ${slug}`);
}
seen.add(slug);
}
}
export function sortPostsByDate<TPost extends PostLike>(posts: TPost[]): TPost[] {
return [...posts].sort(
(a, b) => b.data.publishedAt.getTime() - a.data.publishedAt.getTime(),
);
}
export function getPublicPosts<TPost extends PostLike>(posts: TPost[]): TPost[] {
return sortPostsByDate(posts.filter((post) => !post.data.draft));
}
/**
* 精选文章：只返回显式标记 `featured: true` 的文章（按发布时间降序）。
* 不做"最新文章自动补齐"——新文章默认 featured: false，不会自动进入精选列表。
*/
export function getFeaturedPosts<TPost extends PostLike>(
posts: TPost[],
limit = 3,
): TPost[] {
return getPublicPosts(posts)
.filter((post) => post.data.featured)
.slice(0, limit);
}
export function getRelatedPosts<TPost extends PostLike>(
posts: TPost[],
currentPost: TPost,
limit = 4,
): TPost[] {
const currentSlug = getPostSlug(currentPost);
const currentTags = new Set(currentPost.data.tags ?? []);
const seenSlugs = new Set<string>();
return getPublicPosts(posts)
.filter((post) => {
const slug = getPostSlug(post);
if (slug === currentSlug || seenSlugs.has(slug)) return false;
seenSlugs.add(slug);
return true;
})
.map((post) => ({
post,
sameSeries: Boolean(
currentPost.data.series && post.data.series === currentPost.data.series,
),
sharedTags: new Set(post.data.tags ?? []).intersection(currentTags).size,
sameCategory: post.data.category === currentPost.data.category,
}))
.sort(
(a, b) =>
Number(b.sameSeries) - Number(a.sameSeries) ||
b.sharedTags - a.sharedTags ||
Number(b.sameCategory) - Number(a.sameCategory) ||
b.post.data.publishedAt.getTime() - a.post.data.publishedAt.getTime(),
)
.slice(0, Math.max(0, limit))
.map(({ post }) => post);
}
export function getAdjacentPosts<TPost extends PostLike>(
posts: TPost[],
currentSlug: string,
): { previous?: TPost; next?: TPost } {
const publicPosts = getPublicPosts(posts);
const currentIndex = publicPosts.findIndex((post) => getPostSlug(post) === currentSlug);
if (currentIndex === -1) return {};
return {
previous: publicPosts[currentIndex + 1],
next: publicPosts[currentIndex - 1],
};
}
export function calculateReadingTime(body = ""): number {
const words = body.trim().split(/\s+/).filter(Boolean).length;
return Math.max(1, Math.ceil(words / 200));
}
const MAX_POST_DESCRIPTION_LENGTH = 150;
function stripMarkdownForDescription(markdown: string): string {
return markdown
.replace(/<!--[\s\S]*?-->/g, " ")
.replace(/```[\s\S]*?```/g, " ")
.replace(/~~~[\s\S]*?~~~/g, " ")
.replace(/!\[([^\]]*)\]\([^)]*\)/g, "$1")
.replace(/\[([^\]]+)\]\([^)]*\)/g, "$1")
.replace(/<[^>]+>/g, " ")
.replace(/^\s{0,3}#{1,6}\s+/gm, " ")
.replace(/^\s{0,3}>\s?/gm, " ")
.replace(/^[-*_]{3,}\s*$/gm, " ")
.replace(/~~([^~]+)~~/g, "$1")
.replace(/\*\*([^*]+)\*\*/g, "$1")
.replace(/\*([^*]+)\*/g, "$1")
.replace(/__([^_]+)__/g, "$1")
.replace(/`([^`]+)`/g, "$1")
.replace(/[#>*_|`]/g, " ")
.replace(/\s+/g, " ")
.trim();
}
export function derivePostDescription(body = ""): string {
const text = stripMarkdownForDescription(body);
if (!text) return "";
const chars = Array.from(text);
if (chars.length <= MAX_POST_DESCRIPTION_LENGTH) return text;
return `${chars.slice(0, MAX_POST_DESCRIPTION_LENGTH).join("").trimEnd()}…`;
}
export function getPostDescription<TPost extends PostLike>(post: TPost): string {
const manual = post.data.description?.trim();
return manual || derivePostDescription(post.body ?? "");
}
export function groupPostsByCategory<TPost extends PostLike>(
posts: TPost[],
): TaxonomyGroup<TPost>[] {
const groups = new Map<string, TPost[]>();
for (const post of getPublicPosts(posts)) {
const list = groups.get(post.data.category) ?? [];
list.push(post);
groups.set(post.data.category, list);
}
return [...groups.entries()].map(([name, groupedPosts]) => ({
name,
count: groupedPosts.length,
posts: groupedPosts,
}));
}
export function groupPostsByTag<TPost extends PostLike>(
posts: TPost[],
): TaxonomyGroup<TPost>[] {
const groups = new Map<string, TPost[]>();
for (const post of getPublicPosts(posts)) {
for (const tag of post.data.tags ?? []) {
const list = groups.get(tag) ?? [];
list.push(post);
groups.set(tag, list);
}
}
return [...groups.entries()]
.sort(([a], [b]) => compareTagNames(a, b))
.map(([name, groupedPosts]) => ({
name,
count: groupedPosts.length,
posts: groupedPosts,
}));
}
export function getTagInitial(name: string): string {
const firstChar = Array.from(name.trim())[0];
if (!firstChar) return "#";
if (asciiLetterPattern.test(firstChar)) return firstChar.toUpperCase();
const [firstPinyin] = pinyin(firstChar, {
pattern: "first",
toneType: "none",
type: "array",
});
if (firstPinyin && asciiLetterPattern.test(firstPinyin)) {
return firstPinyin.toUpperCase();
}
return "#";
}
export function groupTagsByInitial<TPost extends PostLike>(
posts: TPost[],
): TagDirectoryGroup<TPost>[] {
const groups = new Map<string, TaxonomyGroup<TPost>[]>();
for (const tag of groupPostsByTag(posts)) {
const initial = getTagInitial(tag.name);
const list = groups.get(initial) ?? [];
list.push(tag);
groups.set(initial, list);
}
return [...groups.entries()]
.sort(([a], [b]) => compareTagInitials(a, b))
.map(([initial, tags]) => {
const sortedTags = [...tags].sort((a, b) => compareTagNames(a.name, b.name));
return {
initial,
count: sortedTags.length,
postsCount: sortedTags.reduce((sum, tag) => sum + tag.count, 0),
tags: sortedTags,
};
});
}
export function groupPostsByArchive<TPost extends PostLike>(
posts: TPost[],
): ArchiveYear<TPost>[] {
const years = new Map<number, Map<number, TPost[]>>();
for (const post of getPublicPosts(posts)) {
const date = post.data.publishedAt;
const year = date.getFullYear();
const month = date.getMonth() + 1;
const months = years.get(year) ?? new Map<number, TPost[]>();
const monthPosts = months.get(month) ?? [];
monthPosts.push(post);
months.set(month, monthPosts);
years.set(year, months);
}
return [...years.entries()]
.sort(([a], [b]) => b - a)
.map(([year, months]) => ({
year,
months: [...months.entries()]
.sort(([a], [b]) => b - a)
.map(([month, monthPosts]) => ({
month,
label: monthLabels[month - 1] ?? `${month}月`,
posts: monthPosts,
})),
}));
}
export function getSeriesPosts<TPost extends PostLike>(
posts: TPost[],
seriesSlug: string,
): TPost[] {
return getPublicPosts(posts)
.filter((post) => post.data.series === seriesSlug)
.sort((a, b) => (a.data.seriesOrder ?? 999) - (b.data.seriesOrder ?? 999));
}
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