61 lines
1.6 KiB
TypeScript
61 lines
1.6 KiB
TypeScript
const yamlKvRegex = /^\s*(\w+):\s*["']?([^'"]*)["']?$/;
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const yamlListItemRegex = /^\s*-\s+["']?([^'"]+)["']?$/;
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const frontMatterRegex = /^---\n(([^\n]|\n)*?)---\n/;
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/**
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* Cheap YAML parser to determine tags (ugly, regex based but fast)
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* @param yamlText
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* @returns
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*/
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export function determineTags(yamlText: string): string[] {
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const lines = yamlText.split("\n");
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let inTagsSection = false;
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const tags: string[] = [];
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for (const line of lines) {
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const yamlKv = yamlKvRegex.exec(line);
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if (yamlKv) {
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const [key, value] = yamlKv.slice(1);
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// Looking for a 'tags' key
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if (key === "tags") {
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inTagsSection = true;
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// 'template' there? Yay!
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if (value) {
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tags.push(
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...value.split(/,\s*|\s+/).map((t) => t.replace(/^#/, "")),
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);
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}
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} else {
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inTagsSection = false;
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}
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}
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const yamlListem = yamlListItemRegex.exec(line);
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if (yamlListem && inTagsSection) {
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tags.push(yamlListem[1].replace(/^#/, ""));
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}
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}
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return tags;
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}
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/**
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* Quick and dirty way to check if a page is a template or not
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* @param pageText
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* @returns
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*/
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export function isTemplate(pageText: string): boolean {
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const frontmatter = frontMatterRegex.exec(pageText);
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// Poor man's YAML frontmatter parsing
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if (frontmatter) {
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pageText = pageText.slice(frontmatter[0].length);
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const frontmatterText = frontmatter[1];
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const tags = determineTags(frontmatterText);
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if (tags.includes("template")) {
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return true;
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}
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}
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// Or if the page text starts with a #template tag
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if (/^\s*#template(\W|$)/.test(pageText)) {
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return true;
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}
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return false;
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}
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