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' file to indicate the style that should be used. 32style = 'file' 33 34# Get the current text. 35buf = vim.current.buffer 36text = '\n'.join(buf) 37 38# Determine range to format. 39cursor = int(vim.eval('line2byte(line("."))+col(".")')) - 2 40lines = '%s:%s' % (vim.current.range.start + 1, vim.current.range.end + 1) 41 42# Avoid flashing an ugly, ugly cmd prompt on Windows when invoking clang-format. 43startupinfo = None 44if sys.platform.startswith('win32'): 45 startupinfo = subprocess.STARTUPINFO() 46 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW 47 startupinfo.wShowWindow = subprocess.SW_HIDE 48 49# Call formatter. 50p = subprocess.Popen([binary, '-lines', lines, '-style', style, 51 '-cursor', str(cursor)], 52 stdout=subprocess.PIPE, stderr=subprocess.PIPE, 53 stdin=subprocess.PIPE, startupinfo=startupinfo) 54stdout, stderr = p.communicate(input=text) 55 56# If successful, replace buffer contents. 57if stderr: 58 message = stderr.splitlines()[0] 59 parts = message.split(' ', 2) 60 if len(parts) > 2: 61 message = parts[2] 62 print 'Formatting failed: %s (total %d warnings, %d errors)' % ( 63 message, stderr.count('warning:'), stderr.count('error:')) 64 65if not stdout: 66 print ('No output from clang-format (crashed?).\n' + 67 'Please report to bugs.llvm.org.') 68else: 69 lines = stdout.split('\n') 70 output = json.loads(lines[0]) 71 lines = lines[1:] 72 sequence = difflib.SequenceMatcher(None, vim.current.buffer, lines) 73 for op in reversed(sequence.get_opcodes()): 74 if op[0] is not 'equal': 75 vim.current.buffer[op[1]:op[2]] = lines[op[3]:op[4]] 76 vim.command('goto %d' % (output['Cursor'] + 1)) 77