Function parseFileHeader

src/patch/parse.ts:414–436

(index: Partial<StructuredPatch>)

  // Parses the --- and +++ headers, if none are found, no lines
  // are consumed.
  function parseFileHeader(index: Partial<StructuredPatch>) {
    const fileHeaderMatch = (/^(---|\+\+\+)\s+/).exec(diffstr[i]);
    if (fileHeaderMatch) {
      const prefix = fileHeaderMatch[1],
            data = diffstr[i].substring(3).trim().split('\t', 2),
            header = (data[1] || '').trim();
      let fileName = data[0];
      if (fileName.startsWith('"')) {
        fileName = unquoteIfQuoted(fileName);
      } else {
        fileName = fileName.replace(/\\\\/g, '\\');
      }
      if (prefix === '---') {
        index.oldFileName = fileName;
        index.oldHeader = header;
      } else {
        index.newFileName = fileName;
        index.newHeader = header;
      }

      i++;
    }
  }

  // Parses a hunk
  // This assumes that we are at the start of a hunk.