Function getOffsetPositionAtLastNewLine

core/nextEdit/diff/diff.ts:12–61

(
  diffLines: DiffLine[],
  lineContentAtCursorPos: string,
  lineOffsetAtCursorPos: number,
)

 * @returns Offset position at last new line inside the editable region.
 */
export function getOffsetPositionAtLastNewLine(
  diffLines: DiffLine[],
  lineContentAtCursorPos: string,
  lineOffsetAtCursorPos: number,
): {
  line: number;
  character: number;
} {
  let lastNewLineContent = "";
  let lineOffset = -1;
  let currentResultLine = 0;
  let hasChanges = false;

  // Build the string while tracking line numbers in the result
  diffLines.reduce((acc, curr, i) => {
    // Add the current line to our result
    acc += curr.line;

    // Add newline if not the last line
    if (i < diffLines.length - 1) {
      acc += "\n";
    }

    // If this is a "new" or "same" line, it will be part of the result
    if (curr.type === "new" || curr.type === "same") {
      if (curr.type === "new") {
        // If it's a new line, update our tracking
        lastNewLineContent = curr.line;
        lineOffset = currentResultLine;
        hasChanges = true;
      }
      // Increment our position in the result
      currentResultLine++;
    }

    return acc;
  }, "");

  // If nothing has changed, return the original position
  if (!hasChanges) {
    lineOffset = lineOffsetAtCursorPos;
    lastNewLineContent = lineContentAtCursorPos;
  }
  // Calculate the character position for the end of the last relevant line
  const endOfCharPos = lastNewLineContent.length;
  return {
    line: lineOffset,
    character: endOfCharPos,
  };
}

export function getRenderableDiffWithGutterAnnotations(
  diffLines: DiffLine[],