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annotate tools/clang/docs/ClangFormat.rst @ 95:afa8332a0e37 LLVM3.8

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LLVM 3.8
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Tue, 13 Oct 2015 17:48:58 +0900
parents 60c9769439b8
children 7d135dc70f03
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1 ===========
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2 ClangFormat
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3 ===========
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4
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5 `ClangFormat` describes a set of tools that are built on top of
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6 :doc:`LibFormat`. It can support your workflow in a variety of ways including a
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7 standalone tool and editor integrations.
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8
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9
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10 Standalone Tool
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11 ===============
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12
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13 :program:`clang-format` is located in `clang/tools/clang-format` and can be used
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14 to format C/C++/Obj-C code.
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15
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16 .. code-block:: console
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17
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18 $ clang-format -help
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19 OVERVIEW: A tool to format C/C++/Obj-C code.
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20
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21 If no arguments are specified, it formats the code from standard input
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22 and writes the result to the standard output.
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23 If <file>s are given, it reformats the files. If -i is specified
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24 together with <file>s, the files are edited in-place. Otherwise, the
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25 result is written to the standard output.
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26
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27 USAGE: clang-format [options] [<file> ...]
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28
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29 OPTIONS:
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30
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31 Clang-format options:
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32
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33 -cursor=<uint> - The position of the cursor when invoking
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34 clang-format from an editor integration
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35 -dump-config - Dump configuration options to stdout and exit.
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36 Can be used with -style option.
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37 -i - Inplace edit <file>s, if specified.
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38 -length=<uint> - Format a range of this length (in bytes).
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39 Multiple ranges can be formatted by specifying
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40 several -offset and -length pairs.
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41 When only a single -offset is specified without
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42 -length, clang-format will format up to the end
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43 of the file.
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44 Can only be used with one input file.
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45 -lines=<string> - <start line>:<end line> - format a range of
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46 lines (both 1-based).
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47 Multiple ranges can be formatted by specifying
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48 several -lines arguments.
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49 Can't be used with -offset and -length.
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50 Can only be used with one input file.
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51 -offset=<uint> - Format a range starting at this byte offset.
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52 Multiple ranges can be formatted by specifying
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53 several -offset and -length pairs.
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54 Can only be used with one input file.
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55 -output-replacements-xml - Output replacements as XML.
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56 -style=<string> - Coding style, currently supports:
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57 LLVM, Google, Chromium, Mozilla, WebKit.
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58 Use -style=file to load style configuration from
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59 .clang-format file located in one of the parent
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60 directories of the source file (or current
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61 directory for stdin).
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62 Use -style="{key: value, ...}" to set specific
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63 parameters, e.g.:
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64 -style="{BasedOnStyle: llvm, IndentWidth: 8}"
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65
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66 General options:
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67
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68 -help - Display available options (-help-hidden for more)
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69 -help-list - Display list of available options (-help-list-hidden for more)
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70 -version - Display the version of this program
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71
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72
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73 When the desired code formatting style is different from the available options,
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74 the style can be customized using the ``-style="{key: value, ...}"`` option or
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75 by putting your style configuration in the ``.clang-format`` or ``_clang-format``
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76 file in your project's directory and using ``clang-format -style=file``.
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77
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78 An easy way to create the ``.clang-format`` file is:
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79
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80 .. code-block:: console
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81
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82 clang-format -style=llvm -dump-config > .clang-format
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83
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84 Available style options are described in :doc:`ClangFormatStyleOptions`.
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85
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86
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87 Vim Integration
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88 ===============
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89
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90 There is an integration for :program:`vim` which lets you run the
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91 :program:`clang-format` standalone tool on your current buffer, optionally
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92 selecting regions to reformat. The integration has the form of a `python`-file
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93 which can be found under `clang/tools/clang-format/clang-format.py`.
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94
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95 This can be integrated by adding the following to your `.vimrc`:
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96
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97 .. code-block:: vim
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98
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99 map <C-K> :pyf <path-to-this-file>/clang-format.py<cr>
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100 imap <C-K> <c-o>:pyf <path-to-this-file>/clang-format.py<cr>
0
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101
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102 The first line enables :program:`clang-format` for NORMAL and VISUAL mode, the
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103 second line adds support for INSERT mode. Change "C-K" to another binding if
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104 you need :program:`clang-format` on a different key (C-K stands for Ctrl+k).
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105
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106 With this integration you can press the bound key and clang-format will
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107 format the current line in NORMAL and INSERT mode or the selected region in
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108 VISUAL mode. The line or region is extended to the next bigger syntactic
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109 entity.
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110
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111 It operates on the current, potentially unsaved buffer and does not create
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112 or save any files. To revert a formatting, just undo.
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113
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114
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115 Emacs Integration
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116 =================
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117
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118 Similar to the integration for :program:`vim`, there is an integration for
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119 :program:`emacs`. It can be found at `clang/tools/clang-format/clang-format.el`
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120 and used by adding this to your `.emacs`:
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121
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122 .. code-block:: common-lisp
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123
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124 (load "<path-to-clang>/tools/clang-format/clang-format.el")
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125 (global-set-key [C-M-tab] 'clang-format-region)
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126
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127 This binds the function `clang-format-region` to C-M-tab, which then formats the
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128 current line or selected region.
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129
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130
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131 BBEdit Integration
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132 ==================
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133
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134 :program:`clang-format` cannot be used as a text filter with BBEdit, but works
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135 well via a script. The AppleScript to do this integration can be found at
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136 `clang/tools/clang-format/clang-format-bbedit.applescript`; place a copy in
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137 `~/Library/Application Support/BBEdit/Scripts`, and edit the path within it to
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138 point to your local copy of :program:`clang-format`.
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139
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140 With this integration you can select the script from the Script menu and
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141 :program:`clang-format` will format the selection. Note that you can rename the
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142 menu item by renaming the script, and can assign the menu item a keyboard
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143 shortcut in the BBEdit preferences, under Menus & Shortcuts.
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144
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145
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146 Visual Studio Integration
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147 =========================
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148
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149 Download the latest Visual Studio extension from the `alpha build site
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150 <http://llvm.org/builds/>`_. The default key-binding is Ctrl-R,Ctrl-F.
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151
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152
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153 Script for patch reformatting
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154 =============================
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155
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156 The python script `clang/tools/clang-format-diff.py` parses the output of
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157 a unified diff and reformats all contained lines with :program:`clang-format`.
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158
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159 .. code-block:: console
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160
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161 usage: clang-format-diff.py [-h] [-i] [-p NUM] [-regex PATTERN] [-style STYLE]
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162
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163 Reformat changed lines in diff. Without -i option just output the diff that
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164 would be introduced.
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165
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166 optional arguments:
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167 -h, --help show this help message and exit
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168 -i apply edits to files instead of displaying a diff
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169 -p NUM strip the smallest prefix containing P slashes
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170 -regex PATTERN custom pattern selecting file paths to reformat
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171 -style STYLE formatting style to apply (LLVM, Google, Chromium, Mozilla,
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172 WebKit)
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173
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174 So to reformat all the lines in the latest :program:`git` commit, just do:
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175
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176 .. code-block:: console
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177
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178 git diff -U0 HEAD^ | clang-format-diff.py -i -p1
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179
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180 In an SVN client, you can do:
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181
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182 .. code-block:: console
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183
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184 svn diff --diff-cmd=diff -x-U0 | clang-format-diff.py -i
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185
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186 The :option:`-U0` will create a diff without context lines (the script would format
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187 those as well).