1# This file is a minimal clang-format vim-integration. To install: 2# - Change 'binary' if clang-format is not on the path (see below). 3# - Add to your .vimrc: 4# 5# map <C-I> :pyf <path-to-this-file>/clang-format.py<CR> 6# imap <C-I> <ESC>:pyf <path-to-this-file>/clang-format.py<CR>i 7# 8# The first line enables clang-format for NORMAL and VISUAL mode, the second 9# line adds support for INSERT mode. Change "C-I" to another binding if you 10# need clang-format on a different key (C-I stands for Ctrl+i). 11# 12# With this integration you can press the bound key and clang-format will 13# format the current line in NORMAL and INSERT mode or the selected region in 14# VISUAL mode. The line or region is extended to the next bigger syntactic 15# entity. 16# 17# It operates on the current, potentially unsaved buffer and does not create 18# or save any files. To revert a formatting, just undo. 19 20import difflib 21import json 22import subprocess 23import sys 24import vim 25 26# Change this to the full path if clang-format is not on the path. 27binary = 'clang-format' 28 29# Change this to format according to other formatting styles. See the output of 30# 'clang-format --help' for a list of supported styles. The default looks for 31# a '.clang-format' or '_clang-format' file to indicate the style that should be 32# used. 33style = 'file' 34 35# Get the current text. 36buf = vim.current.buffer 37text = '\n'.join(buf) 38 39# Determine range to format. 40cursor = int(vim.eval('line2byte(line("."))+col(".")')) - 2 41lines = '%s:%s' % (vim.current.range.start + 1, vim.current.range.end + 1) 42 43# Avoid flashing an ugly, ugly cmd prompt on Windows when invoking clang-format. 44startupinfo = None 45if sys.platform.startswith('win32'): 46 startupinfo = subprocess.STARTUPINFO() 47 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW 48 startupinfo.wShowWindow = subprocess.SW_HIDE 49 50# Call formatter. 51command = [binary, '-lines', lines, '-style', style, '-cursor', str(cursor)] 52if vim.current.buffer.name: 53 command.extend(['-assume-filename', vim.current.buffer.name]) 54p = subprocess.Popen(command, 55 stdout=subprocess.PIPE, stderr=subprocess.PIPE, 56 stdin=subprocess.PIPE, startupinfo=startupinfo) 57stdout, stderr = p.communicate(input=text) 58 59# If successful, replace buffer contents. 60if stderr: 61 message = stderr.splitlines()[0] 62 parts = message.split(' ', 2) 63 if len(parts) > 2: 64 message = parts[2] 65 print 'Formatting failed: %s (total %d warnings, %d errors)' % ( 66 message, stderr.count('warning:'), stderr.count('error:')) 67 68if not stdout: 69 print ('No output from clang-format (crashed?).\n' + 70 'Please report to bugs.llvm.org.') 71else: 72 lines = stdout.split('\n') 73 output = json.loads(lines[0]) 74 lines = lines[1:] 75 sequence = difflib.SequenceMatcher(None, vim.current.buffer, lines) 76 for op in reversed(sequence.get_opcodes()): 77 if op[0] is not 'equal': 78 vim.current.buffer[op[1]:op[2]] = lines[op[3]:op[4]] 79 vim.command('goto %d' % (output['Cursor'] + 1)) 80