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 35def main(): 36 # Get the current text. 37 buf = vim.current.buffer 38 text = '\n'.join(buf) 39 40 # Determine range to format. 41 lines = '%s:%s' % (vim.current.range.start + 1, vim.current.range.end + 1) 42 43 # Determine the cursor position. 44 cursor = int(vim.eval('line2byte(line("."))+col(".")')) - 2 45 if cursor < 0: 46 print 'Couldn\'t determine cursor position. Is your file empty?' 47 return 48 49 # Avoid flashing an ugly, ugly cmd prompt on Windows when invoking clang-format. 50 startupinfo = None 51 if sys.platform.startswith('win32'): 52 startupinfo = subprocess.STARTUPINFO() 53 startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW 54 startupinfo.wShowWindow = subprocess.SW_HIDE 55 56 # Call formatter. 57 command = [binary, '-lines', lines, '-style', style, '-cursor', str(cursor)] 58 if vim.current.buffer.name: 59 command.extend(['-assume-filename', vim.current.buffer.name]) 60 p = subprocess.Popen(command, 61 stdout=subprocess.PIPE, stderr=subprocess.PIPE, 62 stdin=subprocess.PIPE, startupinfo=startupinfo) 63 stdout, stderr = p.communicate(input=text) 64 65 # If successful, replace buffer contents. 66 if stderr: 67 print stderr 68 69 if not stdout: 70 print ('No output from clang-format (crashed?).\n' + 71 'Please report to bugs.llvm.org.') 72 else: 73 lines = stdout.split('\n') 74 output = json.loads(lines[0]) 75 lines = lines[1:] 76 sequence = difflib.SequenceMatcher(None, vim.current.buffer, lines) 77 for op in reversed(sequence.get_opcodes()): 78 if op[0] is not 'equal': 79 vim.current.buffer[op[1]:op[2]] = lines[op[3]:op[4]] 80 vim.command('goto %d' % (output['Cursor'] + 1)) 81 82main() 83