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import { type Component, createSignal, onMount } from "solid-js"
import { diffLines, type Change } from "diff"
import CodeBlock from "./CodeBlock"
import styles from "./diffView.module.css"
type DiffRow = {
left: string
right: string
type: "added" | "removed" | "unchanged"
}
interface DiffViewProps {
oldCode: string
newCode: string
lang?: string
class?: string
}
const DiffView: Component<DiffViewProps> = (props) => {
const [rows, setRows] = createSignal<DiffRow[]>([])
onMount(() => {
const chunks = diffLines(props.oldCode, props.newCode)
const diffRows: DiffRow[] = []
chunks.forEach((chunk: Change) => {
const lines = chunk.value.split(/\r?\n/)
if (lines.at(-1) === "") lines.pop()
lines.forEach((line) => {
diffRows.push({
left: chunk.removed ? line : chunk.added ? "" : line,
right: chunk.added ? line : chunk.removed ? "" : line,
type: chunk.added ? "added"
: chunk.removed ? "removed"
: "unchanged",
})
})
})
setRows(diffRows)
})
return (
<div class={`${styles.diff} ${props.class ?? ""}`}>
{rows().map((r) => (
<div data-section="row">
<CodeBlock
code={r.left}
lang={props.lang}
data-section="cell"
data-diff-type={r.type === "removed" ? "removed" : ""}
/>
<CodeBlock
code={r.right}
lang={props.lang}
data-section="cell"
data-diff-type={r.type === "added" ? "added" : ""}
/>
</div>
))}
</div>
)
}
export default DiffView
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