128 lines
4.5 KiB
Python
128 lines
4.5 KiB
Python
# This file is a minimal clang-format vim-integration. To install:
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# - Change 'binary' if clang-format is not on the path (see below).
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# - Add to your .vimrc:
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#
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# map <C-I> :pyf <path-to-this-file>/clang-format.py<cr>
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# imap <C-I> <c-o>:pyf <path-to-this-file>/clang-format.py<cr>
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#
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# The first line enables clang-format for NORMAL and VISUAL mode, the second
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# line adds support for INSERT mode. Change "C-I" to another binding if you
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# need clang-format on a different key (C-I stands for Ctrl+i).
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#
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# With this integration you can press the bound key and clang-format will
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# format the current line in NORMAL and INSERT mode or the selected region in
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# VISUAL mode. The line or region is extended to the next bigger syntactic
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# entity.
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#
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# You can also pass in the variable "l:lines" to choose the range for
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# formatting. This variable can either contain "<start line>:<end line>" or
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# "all" to format the full file. So, to format the full file, write a function
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# like:
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# :function FormatFile()
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# : let l:lines="all"
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# : pyf <path-to-this-file>/clang-format.py
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# :endfunction
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#
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# It operates on the current, potentially unsaved buffer and does not create
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# or save any files. To revert a formatting, just undo.
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from __future__ import print_function
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import difflib
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import json
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import platform
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import subprocess
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import sys
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import vim
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# set g:clang_format_path to the path to clang-format if it is not on the path
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# Change this to the full path if clang-format is not on the path.
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binary = 'clang-format'
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if vim.eval('exists("g:clang_format_path")') == "1":
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binary = vim.eval('g:clang_format_path')
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# Change this to format according to other formatting styles. See the output of
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# 'clang-format --help' for a list of supported styles. The default looks for
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# a '.clang-format' or '_clang-format' file to indicate the style that should be
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# used.
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style = 'file'
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fallback_style = None
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if vim.eval('exists("g:clang_format_fallback_style")') == "1":
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fallback_style = vim.eval('g:clang_format_fallback_style')
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def get_buffer(encoding):
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if platform.python_version_tuple()[0] == '3':
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return vim.current.buffer
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return [ line.decode(encoding) for line in vim.current.buffer ]
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def main():
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# Get the current text.
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encoding = vim.eval("&encoding")
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buf = get_buffer(encoding)
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text = '\n'.join(buf)
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# Determine range to format.
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if vim.eval('exists("l:lines")') == '1':
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lines = vim.eval('l:lines')
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elif vim.eval('exists("l:formatdiff")') == '1':
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with open(vim.current.buffer.name, 'r') as f:
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ondisk = f.read().splitlines();
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sequence = difflib.SequenceMatcher(None, ondisk, vim.current.buffer)
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lines = []
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for op in reversed(sequence.get_opcodes()):
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if op[0] not in ['equal', 'delete']:
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lines += ['-lines', '%s:%s' % (op[3] + 1, op[4])]
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if lines == []:
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return
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else:
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lines = ['-lines', '%s:%s' % (vim.current.range.start + 1,
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vim.current.range.end + 1)]
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# Determine the cursor position.
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cursor = int(vim.eval('line2byte(line("."))+col(".")')) - 2
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if cursor < 0:
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print('Couldn\'t determine cursor position. Is your file empty?')
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return
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# Avoid flashing an ugly, ugly cmd prompt on Windows when invoking clang-format.
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startupinfo = None
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if sys.platform.startswith('win32'):
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startupinfo = subprocess.STARTUPINFO()
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startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
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startupinfo.wShowWindow = subprocess.SW_HIDE
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# Call formatter.
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command = [binary, '-style', style, '-cursor', str(cursor)]
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if lines != 'all':
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command += lines
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if fallback_style:
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command.extend(['-fallback-style', fallback_style])
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if vim.current.buffer.name:
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command.extend(['-assume-filename', vim.current.buffer.name])
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p = subprocess.Popen(command,
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stdout=subprocess.PIPE, stderr=subprocess.PIPE,
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stdin=subprocess.PIPE, startupinfo=startupinfo)
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stdout, stderr = p.communicate(input=text.encode(encoding))
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# If successful, replace buffer contents.
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if stderr:
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print(stderr)
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if not stdout:
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print(
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'No output from clang-format (crashed?).\n'
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'Please report to bugs.llvm.org.'
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)
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else:
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lines = stdout.decode(encoding).split('\n')
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output = json.loads(lines[0])
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lines = lines[1:]
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sequence = difflib.SequenceMatcher(None, buf, lines)
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for op in reversed(sequence.get_opcodes()):
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if op[0] is not 'equal':
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vim.current.buffer[op[1]:op[2]] = lines[op[3]:op[4]]
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if output.get('IncompleteFormat'):
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print('clang-format: incomplete (syntax errors)')
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vim.command('goto %d' % (output['Cursor'] + 1))
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main()
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