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master @ 35 LINES
 
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// Framed unified diff for use outside markdown - the component sibling
// of the ```diff fence. Shares the line classifier with the pipeline.
import { checkGrid, len } from "../../lib/ascii";
import { diffLineClass } from "../../lib/rehype-ascii";

export interface Props {
  code: string;
}

export interface DiffRow {
  text: string;
  cls: string | null;
  /** Trailing pad cells before the right border. */
  pad: number;
}

export function layoutDiff(code: string, width: number, classify = true): DiffRow[
] {
  const inner = width - 4;
  return code
    .replace(/\n+$/, "")
    .split("\n")
    .flatMap((line) => {
      const cls = classify ? diffLineClass(line) : null;
      const cps = [...line];
      const chunks = cps.length <= inner
        ? [line]
        : Array.from({ length: Math.ceil(cps.length / inner) }, (_, i) =>
            cps.slice(i * inner, (i + 1) * inner).join(""));
      return chunks.map((text) => {
        checkGrid(text, inner, "diff row");
        return { text, cls, pad: inner - len(text) };
      });
    });
}


// Framed unified diff for use outside markd
own - the component sibling
// of the ```diff fence. Shares the line cla
ssifier with the pipeline.
import { checkGrid, len } from "../../lib/as
cii";
import { diffLineClass } from "../../lib/reh
ype-ascii";

export interface Props {
  code: string;
}

export interface DiffRow {
  text: string;
  cls: string | null;
  /** Trailing pad cells before the right bo
rder. */
  pad: number;
}

export function layoutDiff(code: string, wid
th: number, classify = true): DiffRow[] {
  const inner = width - 4;
  return code
    .replace(/\n+$/, "")
    .split("\n")
    .flatMap((line) => {
      const cls = classify ? diffLineClass(l
ine) : null;
      const cps = [...line];
      const chunks = cps.length <= inner
        ? [line]
        : Array.from({ length: Math.ceil(cps
.length / inner) }, (_, i) =>
            cps.slice(i * inner, (i + 1) * i
nner).join(""));
      return chunks.map((text) => {
        checkGrid(text, inner, "diff row");
        return { text, cls, pad: inner - len
(text) };
      });
    });
}

 
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