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extendMarkdownIt.ts
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extendMarkdownIt.ts
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import MarkdownIt from 'markdown-it';
import markdownItRegex from 'markdown-it-regex';
import path from 'path';
import fs from 'fs';
import { cache } from '../workspace';
import {
getImgUrlForMarkdownPreview,
getFileUrlForMarkdownPreview,
containsImageExt,
containsUnknownExt,
findUriByRef,
extractEmbedRefs,
parseRef,
commonExtsHint,
} from '../utils';
const getInvalidRefAnchor = (text: string) =>
`<a class="memo-invalid-link" title="Link does not exist yet. Please use cmd / ctrl + click in text editor to create a new one." href="javascript:void(0)">${text}</a>`;
const getUnknownExtRefAnchor = (text: string, ref: string) =>
`<a class="memo-invalid-link" title="Link contains unknown extension: ${
path.parse(ref).ext
}. Please use common file extensions ${commonExtsHint} to enable full support." href="javascript:void(0)">${text}</a>`;
const getRefAnchor = (href: string, text: string) =>
`<a title="${href}" href="${href}" data-href="${href}">${text}</a>`;
const extendMarkdownIt = (md: MarkdownIt) => {
const refsStack: string[] = [];
const mdExtended = md
.use(markdownItRegex, {
name: 'ref-resource',
regex: /!\[\[([^\[\]]+?)\]\]/,
replace: (rawRef: string) => {
const { ref, label } = parseRef(rawRef);
if (containsImageExt(ref)) {
const imagePath = findUriByRef(cache.getWorkspaceCache().imageUris, ref)?.fsPath;
if (imagePath) {
return `<div><img src="${getImgUrlForMarkdownPreview(
imagePath,
)}" data-src="${getImgUrlForMarkdownPreview(imagePath)}" alt="${
label || ref
}" /></div>`;
}
}
const fsPath = findUriByRef(cache.getWorkspaceCache().markdownUris, ref)?.fsPath;
if (!fsPath && containsUnknownExt(ref)) {
return getUnknownExtRefAnchor(label || ref, ref);
}
if (!fsPath || !fs.existsSync(fsPath)) {
return getInvalidRefAnchor(label || ref);
}
const previewFileUrl = getFileUrlForMarkdownPreview(fsPath);
const name = path.parse(fsPath).name;
const content = fs.readFileSync(fsPath).toString();
const refs = extractEmbedRefs(content).map((ref) => ref.toLowerCase());
const cyclicLinkDetected =
refs.includes(ref.toLowerCase()) || refs.some((ref) => refsStack.includes(ref));
if (!cyclicLinkDetected) {
refsStack.push(ref.toLowerCase());
}
const html = `<div class="memo-markdown-embed">
<div class="memo-markdown-embed-title">${name}</div>
<div class="memo-markdown-embed-link">
<a title="${previewFileUrl}" href="${previewFileUrl}" data-href="${previewFileUrl}">
<i class="icon-link"></i>
</a>
</div>
<div class="memo-markdown-embed-content">
${
!cyclicLinkDetected
? (mdExtended as any).render(content, undefined, true)
: '<div class="memo-cyclic-link-warning">Cyclic linking detected 💥.</div>'
}
</div>
</div>`;
if (!cyclicLinkDetected) {
refsStack.pop();
}
return html;
},
})
.use(markdownItRegex, {
name: 'ref-document',
regex: /\[\[([^\[\]]+?)\]\]/,
replace: (rawRef: string) => {
const { ref, label } = parseRef(rawRef);
const fsPath = findUriByRef(cache.getWorkspaceCache().allUris, ref)?.fsPath;
if (!fsPath && containsUnknownExt(ref)) {
return getUnknownExtRefAnchor(label || ref, ref);
}
if (!fsPath) {
return getInvalidRefAnchor(label || ref);
}
return getRefAnchor(getFileUrlForMarkdownPreview(fsPath), label || ref);
},
});
return mdExtended;
};
export default extendMarkdownIt;