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silverbullet/plug-api/lib/yaml_page.ts

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import { findNodeOfType, traverseTree } from "$sb/lib/tree.ts";
import { markdown, space } from "$sb/silverbullet-syscall/mod.ts";
import * as YAML from "yaml";
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export async function readCodeBlockPage(
pageName: string,
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allowedLanguages?: string[],
): Promise<string | undefined> {
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const text = await space.readPage(pageName);
const tree = await markdown.parseMarkdown(text);
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let codeText: string | undefined;
traverseTree(tree, (t): boolean => {
// Find a fenced code block
if (t.type !== "FencedCode") {
return false;
}
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const codeInfoNode = findNodeOfType(t, "CodeInfo");
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if (allowedLanguages && !codeInfoNode) {
return false;
}
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if (
allowedLanguages &&
!allowedLanguages.includes(codeInfoNode!.children![0].text!)
) {
return false;
}
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const codeTextNode = findNodeOfType(t, "CodeText");
if (!codeTextNode) {
// Honestly, this shouldn't happen
return false;
}
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codeText = codeTextNode.children![0].text!;
return true;
});
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return codeText;
}
export async function readYamlPage(
pageName: string,
allowedLanguages = ["yaml"],
): Promise<any> {
const codeText = await readCodeBlockPage(pageName, allowedLanguages);
if (codeText === undefined) {
return undefined;
}
try {
return YAML.parse(codeText);
} catch (e: any) {
console.error("YAML Page parser error", e);
throw new Error(`YAML Error: ${e.message}`);
}
}
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export async function writeYamlPage(
pageName: string,
data: any,
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prelude = "",
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): Promise<void> {
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const text = YAML.stringify(data, {
noCompatMode: true,
});
await space.writePage(pageName, prelude + "```yaml\n" + text + "\n```");
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}