Subversion Repositories QNX 8.QNX8 LLVM/Clang compiler suite

# This file is a minimal clang-format vim-integration. To install:

# - Change 'binary' if clang-format is not on the path (see below).

# - Add to your .vimrc:

#

#   if has('python')

#     map <C-I> :pyf <path-to-this-file>/clang-format.py<cr>

#     imap <C-I> <c-o>:pyf <path-to-this-file>/clang-format.py<cr>

#   elseif has('python3')

#     map <C-I> :py3f <path-to-this-file>/clang-format.py<cr>

#     imap <C-I> <c-o>:py3f <path-to-this-file>/clang-format.py<cr>

#   endif

#

# The if-elseif-endif conditional should pick either the python3 or python2

# integration depending on your vim setup.

#

# The first mapping enables clang-format for NORMAL and VISUAL mode, the second

# mapping adds support for INSERT mode. Change "C-I" to another binding if you

# need clang-format on a different key (C-I stands for Ctrl+i).

#

# With this integration you can press the bound key and clang-format will

# format the current line in NORMAL and INSERT mode or the selected region in

# VISUAL mode. The line or region is extended to the next bigger syntactic

# entity.

#

# You can also pass in the variable "l:lines" to choose the range for

# formatting. This variable can either contain "<start line>:<end line>" or

# "all" to format the full file. So, to format the full file, write a function

# like:

# :function FormatFile()

# :  let l:lines="all"

# :  if has('python')

# :    pyf <path-to-this-file>/clang-format.py

# :  elseif has('python3')

# :    py3f <path-to-this-file>/clang-format.py

# :  endif

# :endfunction

#

# It operates on the current, potentially unsaved buffer and does not create

# or save any files. To revert a formatting, just undo.

from __future__ import absolute_import, division, print_function

import difflib

import json

import os.path

import platform

import subprocess

import sys

import vim

# set g:clang_format_path to the path to clang-format if it is not on the path

# Change this to the full path if clang-format is not on the path.

binary = 'clang-format'

if vim.eval('exists("g:clang_format_path")') == "1":

  binary = vim.eval('g:clang_format_path')

# Change this to format according to other formatting styles. See the output of

# 'clang-format --help' for a list of supported styles. The default looks for

# a '.clang-format' or '_clang-format' file to indicate the style that should be

# used.

style = None

fallback_style = None

if vim.eval('exists("g:clang_format_fallback_style")') == "1":

  fallback_style = vim.eval('g:clang_format_fallback_style')

def get_buffer(encoding):

  if platform.python_version_tuple()[0] == '3':

    return vim.current.buffer

  return [ line.decode(encoding) for line in vim.current.buffer ]

def main():

  # Get the current text.

  encoding = vim.eval("&encoding")

  buf = get_buffer(encoding)

  # Join the buffer into a single string with a terminating newline

  text = ('\n'.join(buf) + '\n').encode(encoding)

  # Determine range to format.

  if vim.eval('exists("l:lines")') == '1':

    lines = ['-lines', vim.eval('l:lines')]

  elif vim.eval('exists("l:formatdiff")') == '1' and \

       os.path.exists(vim.current.buffer.name):

    with open(vim.current.buffer.name, 'r') as f:

      ondisk = f.read().splitlines();

    sequence = difflib.SequenceMatcher(None, ondisk, vim.current.buffer)

    lines = []

    for op in reversed(sequence.get_opcodes()):

      if op[0] not in ['equal', 'delete']:

        lines += ['-lines', '%s:%s' % (op[3] + 1, op[4])]

    if lines == []:

      return

  else:

    lines = ['-lines', '%s:%s' % (vim.current.range.start + 1,

                                  vim.current.range.end + 1)]

  # Convert cursor (line, col) to bytes.

  # Don't use line2byte: https://github.com/vim/vim/issues/5930

  _, cursor_line, cursor_col, _ = vim.eval('getpos(".")') # 1-based

  cursor_byte = 0

  for line in text.split(b'\n')[:int(cursor_line) - 1]:

    cursor_byte += len(line) + 1

  cursor_byte += int(cursor_col) - 1

  if cursor_byte < 0:

    print('Couldn\'t determine cursor position. Is your file empty?')

    return

  # Avoid flashing an ugly, ugly cmd prompt on Windows when invoking clang-format.

  startupinfo = None

  if sys.platform.startswith('win32'):

    startupinfo = subprocess.STARTUPINFO()

    startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW

    startupinfo.wShowWindow = subprocess.SW_HIDE

  # Call formatter.

  command = [binary, '-cursor', str(cursor_byte)]

  if lines != ['-lines', 'all']:

    command += lines

  if style:

    command.extend(['-style', style])

  if fallback_style:

    command.extend(['-fallback-style', fallback_style])

  if vim.current.buffer.name:

    command.extend(['-assume-filename', vim.current.buffer.name])

  p = subprocess.Popen(command,

                       stdout=subprocess.PIPE, stderr=subprocess.PIPE,

                       stdin=subprocess.PIPE, startupinfo=startupinfo)

  stdout, stderr = p.communicate(input=text)

  # If successful, replace buffer contents.

  if stderr:

    print(stderr)

  if not stdout:

    print(

        'No output from clang-format (crashed?).\n'

        'Please report to bugs.llvm.org.'

    )

  else:

    header, content = stdout.split(b'\n', 1)

    header = json.loads(header.decode('utf-8'))

    # Strip off the trailing newline (added above).

    # This maintains trailing empty lines present in the buffer if

    # the -lines specification requests them to remain unchanged.

    lines = content.decode(encoding).split('\n')[:-1]

    sequence = difflib.SequenceMatcher(None, buf, lines)

    for op in reversed(sequence.get_opcodes()):

      if op[0] != 'equal':

        vim.current.buffer[op[1]:op[2]] = lines[op[3]:op[4]]

    if header.get('IncompleteFormat'):

      print('clang-format: incomplete (syntax errors)')

    # Convert cursor bytes to (line, col)

    # Don't use goto: https://github.com/vim/vim/issues/5930

    cursor_byte = int(header['Cursor'])

    prefix = content[0:cursor_byte]

    cursor_line = 1 + prefix.count(b'\n')

    cursor_column = 1 + len(prefix.rsplit(b'\n', 1)[-1])

    vim.command('call cursor(%d, %d)' % (cursor_line, cursor_column))

main()