Function parsePatch

packages/arctic/src/patch/index.ts:180–235

(patchText: string)

  }

  export function parsePatch(patchText: string): { hunks: Hunk[] } {
    const lines = patchText.split("\n")
    const hunks: Hunk[] = []
    let i = 0

    // Look for Begin/End patch markers
    const beginMarker = "*** Begin Patch"
    const endMarker = "*** End Patch"

    const beginIdx = lines.findIndex((line) => line.trim() === beginMarker)
    const endIdx = lines.findIndex((line) => line.trim() === endMarker)

    if (beginIdx === -1 || endIdx === -1 || beginIdx >= endIdx) {
      throw new Error("Invalid patch format: missing Begin/End markers")
    }

    // Parse content between markers
    i = beginIdx + 1

    while (i < endIdx) {
      const header = parsePatchHeader(lines, i)
      if (!header) {
        i++
        continue
      }

      if (lines[i].startsWith("*** Add File:")) {
        const { content, nextIdx } = parseAddFileContent(lines, header.nextIdx)
        hunks.push({
          type: "add",
          path: header.filePath,
          contents: content,
        })
        i = nextIdx
      } else if (lines[i].startsWith("*** Delete File:")) {
        hunks.push({
          type: "delete",
          path: header.filePath,
        })
        i = header.nextIdx
      } else if (lines[i].startsWith("*** Update File:")) {
        const { chunks, nextIdx } = parseUpdateFileChunks(lines, header.nextIdx)
        hunks.push({
          type: "update",
          path: header.filePath,
          move_path: header.movePath,
          chunks,
        })
        i = nextIdx
      } else {
        i++
      }
    }

    return { hunks }
  }

  // Apply patch functionality