veridian/app/components/Markdown/Renderer.vue

<script setup lang="ts">
import type { RootContent } from 'hast';
import MarkdownShikiHighlight from './ShikiHighlight.vue';

const props = defineProps<{
    content: string;
    finished: boolean;
    id: string;
}>();

const { $remark } = useNuxtApp();

function splitMarkdown(markdown: string): string[] {
    const paragraphs: string[] = [];
    let currentParagraph = "";
    let isInCodeBlock = false;

    const lines = markdown.split("\n");

    for (let line of lines) {
        if (line.trim().startsWith("```")) {
            isInCodeBlock = !isInCodeBlock;
        }

        if (line.trim() === "" && !isInCodeBlock) {
            if (currentParagraph.trim() !== "") {
                paragraphs.push(currentParagraph.trim());
                currentParagraph = "";
            }
        } else {
            currentParagraph += (currentParagraph === "" ? "" : "\n") + line;
        }
    }

    if (currentParagraph.trim() !== "") {
        paragraphs.push(currentParagraph.trim());
    }

    return paragraphs;
}

const partseAst = async (content: string) => {
    const mdast = $remark.parse(content);
    const hast = $remark.run(mdast);
    return hast;
}

// SSR Initial Load
const { data: hastParts } = await useAsyncData(`md-${props.id}`, async () => {
    return (await partseAst(props.content)).children;
});

let activeIdx = 0;
let partIdx = [0];

if (import.meta.client && hastParts.value && hastParts.value.length > 0 && !props.finished) {
    const initialParts = splitMarkdown(props.content);

    activeIdx = Math.max(0, initialParts.length - 1);

    let currentOffset = 0;
    for (let i = 0; i < initialParts.length; i++) {
        partIdx[i] = currentOffset;

        const tempAst = await partseAst(initialParts[i]!);
        currentOffset += tempAst.children.length;
    }
}


const parts = computed(() => {
    return splitMarkdown(props.content);
})

watch(parts, async (newParts) => {
    if (!hastParts.value) hastParts.value = [];

    while (activeIdx < newParts.length - 1) {
        const finalHast = await partseAst(newParts[activeIdx]!);

        const base: RootContent[] = hastParts.value!.slice(0, partIdx[activeIdx]);
        hastParts.value = base.concat(finalHast.children);

        partIdx[activeIdx + 1] = hastParts.value!.length;
        activeIdx++;
    }

    const currentString = newParts[activeIdx];
    if (currentString !== undefined) {
        const latestHast = await partseAst(currentString);

        const stableBase = hastParts.value!.slice(0, partIdx[activeIdx]);
        hastParts.value = stableBase.concat(latestHast.children);
    }
})
</script>

<template>
    <div class="prose-wrapper">
        <article class="markdown-body">
            <template v-for="(node, index) in hastParts" :key="`${id}-${index}`">
                <MarkdownAstNode :node="node" v-memo="[node.type === 'text' ? node.value : node.data]" />
            </template>
        </article>
    </div>
</template>

<style>
article>* {
    margin-top: 0.25rem;
    margin-bottom: 0.25rem;
}

article>*:first-child {
    margin-top: 0.5rem;
    margin-bottom: 0.25rem;
}

article>*:last-child {
    margin-top: 0.25rem;
    margin-bottom: 0.5rem;
}

article>*:only-child {
    margin-top: 0.25rem;
    margin-bottom: 0.25rem;
}

hr {
    border: 1px solid var(--color-highlight-high);
}

li {
    min-height: 24px;
}

ul {
    list-style: none;
    margin-left: 1.25rem;
    margin-top: 1.25rem;
}

ul>li {
    position: relative;
    padding-bottom: 0.75rem;
    padding-left: 1.5rem;
}

ul>li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0.5rem;
    width: 7px;
    height: 7px;
    background-color: var(--color-muted);
    border-radius: 50%;
    z-index: 2;
}

ul>li::after {
    content: "";
    position: absolute;
    left: 3px;
    top: 23px;
    bottom: 0;
    width: 1px;
    background-color: var(--color-highlight);
    z-index: 1;
}

ul>li:last-child::after {
    display: none;
}

ol {
    list-style: none;
    margin-left: 1.25rem;
    margin-top: 1.25rem;
    counter-reset: ordered-list-counter var(--start-value, 0);
}

ol[start] {
    --start-value: calc(attr(start type(<number>)) - 1);
}

ol>li {
    position: relative;
    padding-bottom: 0.75rem;
    padding-left: 1.5rem;
    counter-increment: ordered-list-counter;
}

ol>li::before {
    content: counter(ordered-list-counter) ".";

    position: absolute;
    left: 0;
    top: 0;
    color: var(--color-muted);
    font-weight: 500;
    width: 1.25rem;
}

html.dark .shiki,
html.dark .shiki span {
    color: var(--shiki-dark) !important;
    background-color: var(--shiki-dark-bg) !important;
    /* Optional, if you also want font styles */
    font-style: var(--shiki-dark-font-style) !important;
    font-weight: var(--shiki-dark-font-weight) !important;
    text-decoration: var(--shiki-dark-text-decoration) !important;
}

ol:only-child,
ul:only-child {
    margin-top: 0 !important;
}

code:not(pre code) {
    background-color: var(--color-highlight);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
}

blockquote {
    color: var(--color-muted);
    border-left: 4px solid var(--color-highlight-high);
    padding-left: 0.5rem;
}

.table-wrapper {
    display: block;
    overflow-x: auto;
    margin: calc(var(--spacing) * 4) 0;
}

/* TODO: make these tables better, this is literally the first attempt from Gemini 3 flash */
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    text-align: left;
    background-color: var(--color-base);
    color: var(--color-text);
}

table thead tr {
    background-color: var(--color-highlight-high);
}

table th {
    padding: calc(var(--spacing) * 3) calc(var(--spacing) * 4);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

table td {
    padding: calc(var(--spacing) * 3) calc(var(--spacing) * 4);
}

table tbody tr {
    background-color: var(--color-highlight);
    transition: background-color 250ms cubic-bezier(0.5, 1, 0.89, 1);
}

table tbody tr:nth-of-type(even) {
    background-color: var(--color-highlight-low);
}

/* Hover effect */
table tbody tr:hover {
    background-color: var(--color-highlight-high);
}


h1,
h2,
h3,
h4,
h5,
h6 {
    margin-top: 0.75rem;
    margin-bottom: 0.75rem;
}

label>span {
    cursor: text;
}

hr {
    margin-top: 1.25rem;
    margin-bottom: 1.25rem;
}

.checkbox {
    width: min-content;
}
</style>