alexion
4def357d09
Imported as a linear vendor commit so forge rebases do not replay the upstream root tree. git-subtree-dir: third_party/pi git-subtree-split: d981de1229ef899957bbe968bc8dcda02a21f477
41 lines
1.2 KiB
TypeScript
41 lines
1.2 KiB
TypeScript
import { parse } from "yaml";
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import { stripBom } from "./text.ts";
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type ParsedFrontmatter<T extends Record<string, unknown>> = {
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frontmatter: T;
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body: string;
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};
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const normalizeNewlines = (value: string): string => value.replace(/\r\n/g, "\n").replace(/\r/g, "\n");
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const extractFrontmatter = (content: string): { yamlString: string | null; body: string } => {
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const normalized = normalizeNewlines(stripBom(content));
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if (!normalized.startsWith("---")) {
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return { yamlString: null, body: normalized };
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}
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const endIndex = normalized.indexOf("\n---", 3);
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if (endIndex === -1) {
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return { yamlString: null, body: normalized };
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}
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return {
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yamlString: normalized.slice(4, endIndex),
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body: normalized.slice(endIndex + 4).trim(),
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};
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};
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export const parseFrontmatter = <T extends Record<string, unknown> = Record<string, unknown>>(
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content: string,
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): ParsedFrontmatter<T> => {
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const { yamlString, body } = extractFrontmatter(content);
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if (!yamlString) {
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return { frontmatter: {} as T, body };
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}
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const parsed = parse(yamlString);
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return { frontmatter: (parsed ?? {}) as T, body };
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};
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export const stripFrontmatter = (content: string): string => parseFrontmatter(content).body;
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