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# 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:
#
# 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>
#
# The first line enables clang-format for NORMAL and VISUAL mode, the second
# line 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"
# : pyf <path-to-this-file>/clang-format.py
# :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 print_function
import difflib
import json
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 = 'file'
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)
text = '\n'.join(buf)
# Determine range to format.
if vim.eval('exists("l:lines")') == '1':
lines = ['-lines', vim.eval('l:lines')]
elif vim.eval('exists("l:formatdiff")') == '1':
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)]
# Determine the cursor position.
cursor = int(vim.eval('line2byte(line("."))+col(".")')) - 2
if cursor < 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, '-style', style, '-cursor', str(cursor)]
if lines != 'all':
command += lines
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.encode(encoding))
# 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:
lines = stdout.decode(encoding).split('\n')
output = json.loads(lines[0])
lines = lines[1:]
sequence = difflib.SequenceMatcher(None, buf, lines)
for op in reversed(sequence.get_opcodes()):
if op[0] is not 'equal':
vim.current.buffer[op[1]:op[2]] = lines[op[3]:op[4]]
if output.get('IncompleteFormat'):
print('clang-format: incomplete (syntax errors)')
vim.command('goto %d' % (output['Cursor'] + 1))
main()
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