# This file is a minimal clang-format sublime-integration. To install:
# - Change 'binary' if clang-format is not on the path (see below).
# - Put this file into your sublime Packages directory, e.g. on Linux:
#     ~/.config/sublime-text-2/Packages/User/clang-format-sublime.py
# - Add a key binding:
#     { "keys": ["ctrl+shift+c"], "command": "clang_format" },
#
# With this integration you can press the bound key and clang-format will
# format the current lines and selections for all cursor positions. The lines
# or regions are extended to the next bigger syntactic entities.
#
# 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 sublime
import sublime_plugin
import subprocess

# Change this to the full path if clang-format is not on the path.
binary = 'clang-format'

# 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'

class ClangFormatCommand(sublime_plugin.TextCommand):
  def run(self, edit):
    encoding = self.view.encoding()
    if encoding == 'Undefined':
      encoding = 'utf-8'
    regions = []
    command = [binary, '-style', style]
    for region in self.view.sel():
      regions.append(region)
      region_offset = min(region.a, region.b)
      region_length = abs(region.b - region.a)
      command.extend(['-offset', str(region_offset),
                      '-length', str(region_length),
                      '-assume-filename', str(self.view.file_name())])
    old_viewport_position = self.view.viewport_position()
    buf = self.view.substr(sublime.Region(0, self.view.size()))
    p = subprocess.Popen(command, stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE, stdin=subprocess.PIPE)
    output, error = p.communicate(buf.encode(encoding))
    if error:
      print(error)
    self.view.replace(
        edit, sublime.Region(0, self.view.size()),
        output.decode(encoding))
    self.view.sel().clear()
    for region in regions:
      self.view.sel().add(region)
    # FIXME: Without the 10ms delay, the viewport sometimes jumps.
    sublime.set_timeout(lambda: self.view.set_viewport_position(
      old_viewport_position, False), 10)
