5 `ClangFormat` describes a set of tools that are built on top of
6 :doc:`LibFormat`. It can support your workflow in a variety of ways including a
7 standalone tool and editor integrations.
13 :program:`clang-format` is located in `clang/tools/clang-format` and can be used
14 to format C/C++/Obj-C code.
16 .. code-block:: console
19 OVERVIEW: A tool to format C/C++/Java/JavaScript/Objective-C/Protobuf code.
21 If no arguments are specified, it formats the code from standard input
22 and writes the result to the standard output.
23 If <file>s are given, it reformats the files. If -i is specified
24 together with <file>s, the files are edited in-place. Otherwise, the
25 result is written to the standard output.
27 USAGE: clang-format [options] [<file> ...]
33 -assume-filename=<string> - When reading from stdin, clang-format assumes this
34 filename to look for a style config file (with
35 -style=file) and to determine the language.
36 -cursor=<uint> - The position of the cursor when invoking
37 clang-format from an editor integration
38 -dump-config - Dump configuration options to stdout and exit.
39 Can be used with -style option.
40 -fallback-style=<string> - The name of the predefined style used as a
41 fallback in case clang-format is invoked with
42 -style=file, but can not find the .clang-format
44 Use -fallback-style=none to skip formatting.
45 -i - Inplace edit <file>s, if specified.
46 -length=<uint> - Format a range of this length (in bytes).
47 Multiple ranges can be formatted by specifying
48 several -offset and -length pairs.
49 When only a single -offset is specified without
50 -length, clang-format will format up to the end
52 Can only be used with one input file.
53 -lines=<string> - <start line>:<end line> - format a range of
55 Multiple ranges can be formatted by specifying
56 several -lines arguments.
57 Can't be used with -offset and -length.
58 Can only be used with one input file.
59 -offset=<uint> - Format a range starting at this byte offset.
60 Multiple ranges can be formatted by specifying
61 several -offset and -length pairs.
62 Can only be used with one input file.
63 -output-replacements-xml - Output replacements as XML.
64 -sort-includes - Sort touched include lines
65 -style=<string> - Coding style, currently supports:
66 LLVM, Google, Chromium, Mozilla, WebKit.
67 Use -style=file to load style configuration from
68 .clang-format file located in one of the parent
69 directories of the source file (or current
71 Use -style="{key: value, ...}" to set specific
73 -style="{BasedOnStyle: llvm, IndentWidth: 8}"
77 -help - Display available options (-help-hidden for more)
78 -help-list - Display list of available options (-help-list-hidden for more)
79 -version - Display the version of this program
82 When the desired code formatting style is different from the available options,
83 the style can be customized using the ``-style="{key: value, ...}"`` option or
84 by putting your style configuration in the ``.clang-format`` or ``_clang-format``
85 file in your project's directory and using ``clang-format -style=file``.
87 An easy way to create the ``.clang-format`` file is:
89 .. code-block:: console
91 clang-format -style=llvm -dump-config > .clang-format
93 Available style options are described in :doc:`ClangFormatStyleOptions`.
99 There is an integration for :program:`vim` which lets you run the
100 :program:`clang-format` standalone tool on your current buffer, optionally
101 selecting regions to reformat. The integration has the form of a `python`-file
102 which can be found under `clang/tools/clang-format/clang-format.py`.
104 This can be integrated by adding the following to your `.vimrc`:
108 map <C-K> :pyf <path-to-this-file>/clang-format.py<cr>
109 imap <C-K> <c-o>:pyf <path-to-this-file>/clang-format.py<cr>
111 The first line enables :program:`clang-format` for NORMAL and VISUAL mode, the
112 second line adds support for INSERT mode. Change "C-K" to another binding if
113 you need :program:`clang-format` on a different key (C-K stands for Ctrl+k).
115 With this integration you can press the bound key and clang-format will
116 format the current line in NORMAL and INSERT mode or the selected region in
117 VISUAL mode. The line or region is extended to the next bigger syntactic
120 It operates on the current, potentially unsaved buffer and does not create
121 or save any files. To revert a formatting, just undo.
127 Similar to the integration for :program:`vim`, there is an integration for
128 :program:`emacs`. It can be found at `clang/tools/clang-format/clang-format.el`
129 and used by adding this to your `.emacs`:
131 .. code-block:: common-lisp
133 (load "<path-to-clang>/tools/clang-format/clang-format.el")
134 (global-set-key [C-M-tab] 'clang-format-region)
136 This binds the function `clang-format-region` to C-M-tab, which then formats the
137 current line or selected region.
143 :program:`clang-format` cannot be used as a text filter with BBEdit, but works
144 well via a script. The AppleScript to do this integration can be found at
145 `clang/tools/clang-format/clang-format-bbedit.applescript`; place a copy in
146 `~/Library/Application Support/BBEdit/Scripts`, and edit the path within it to
147 point to your local copy of :program:`clang-format`.
149 With this integration you can select the script from the Script menu and
150 :program:`clang-format` will format the selection. Note that you can rename the
151 menu item by renaming the script, and can assign the menu item a keyboard
152 shortcut in the BBEdit preferences, under Menus & Shortcuts.
155 Visual Studio Integration
156 =========================
158 Download the latest Visual Studio extension from the `alpha build site
159 <http://llvm.org/builds/>`_. The default key-binding is Ctrl-R,Ctrl-F.
162 Script for patch reformatting
163 =============================
165 The python script `clang/tools/clang-format-diff.py` parses the output of
166 a unified diff and reformats all contained lines with :program:`clang-format`.
168 .. code-block:: console
170 usage: clang-format-diff.py [-h] [-i] [-p NUM] [-regex PATTERN] [-style STYLE]
172 Reformat changed lines in diff. Without -i option just output the diff that
176 -h, --help show this help message and exit
177 -i apply edits to files instead of displaying a diff
178 -p NUM strip the smallest prefix containing P slashes
179 -regex PATTERN custom pattern selecting file paths to reformat
180 -style STYLE formatting style to apply (LLVM, Google, Chromium, Mozilla,
183 So to reformat all the lines in the latest :program:`git` commit, just do:
185 .. code-block:: console
187 git diff -U0 HEAD^ | clang-format-diff.py -i -p1
189 In an SVN client, you can do:
191 .. code-block:: console
193 svn diff --diff-cmd=diff -x-U0 | clang-format-diff.py -i
195 The :option:`-U0` will create a diff without context lines (the script would format