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++/Obj-C 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 -cursor=<uint> - The position of the cursor when invoking
34 clang-format from an editor integration
35 -dump-config - Dump configuration options to stdout and exit.
36 Can be used with -style option.
37 -i - Inplace edit <file>s, if specified.
38 -length=<uint> - Format a range of this length (in bytes).
39 Multiple ranges can be formatted by specifying
40 several -offset and -length pairs.
41 When only a single -offset is specified without
42 -length, clang-format will format up to the end
44 Can only be used with one input file.
45 -lines=<string> - <start line>:<end line> - format a range of
47 Multiple ranges can be formatted by specifying
48 several -lines arguments.
49 Can't be used with -offset and -length.
50 Can only be used with one input file.
51 -offset=<uint> - Format a range starting at this byte offset.
52 Multiple ranges can be formatted by specifying
53 several -offset and -length pairs.
54 Can only be used with one input file.
55 -output-replacements-xml - Output replacements as XML.
56 -style=<string> - Coding style, currently supports:
57 LLVM, Google, Chromium, Mozilla, WebKit.
58 Use -style=file to load style configuration from
59 .clang-format file located in one of the parent
60 directories of the source file (or current
62 Use -style="{key: value, ...}" to set specific
64 -style="{BasedOnStyle: llvm, IndentWidth: 8}"
68 -help - Display available options (-help-hidden for more)
69 -help-list - Display list of available options (-help-list-hidden for more)
70 -version - Display the version of this program
73 When the desired code formatting style is different from the available options,
74 the style can be customized using the ``-style="{key: value, ...}"`` option or
75 by putting your style configuration in the ``.clang-format`` or ``_clang-format``
76 file in your project's directory and using ``clang-format -style=file``.
78 An easy way to create the ``.clang-format`` file is:
80 .. code-block:: console
82 clang-format -style=llvm -dump-config > .clang-format
84 Available style options are described in :doc:`ClangFormatStyleOptions`.
90 There is an integration for :program:`vim` which lets you run the
91 :program:`clang-format` standalone tool on your current buffer, optionally
92 selecting regions to reformat. The integration has the form of a `python`-file
93 which can be found under `clang/tools/clang-format/clang-format.py`.
95 This can be integrated by adding the following to your `.vimrc`:
99 map <C-K> :pyf <path-to-this-file>/clang-format.py<CR>
100 imap <C-K> <ESC>:pyf <path-to-this-file>/clang-format.py<CR>i
102 The first line enables :program:`clang-format` for NORMAL and VISUAL mode, the
103 second line adds support for INSERT mode. Change "C-K" to another binding if
104 you need :program:`clang-format` on a different key (C-K stands for Ctrl+k).
106 With this integration you can press the bound key and clang-format will
107 format the current line in NORMAL and INSERT mode or the selected region in
108 VISUAL mode. The line or region is extended to the next bigger syntactic
111 It operates on the current, potentially unsaved buffer and does not create
112 or save any files. To revert a formatting, just undo.
118 Similar to the integration for :program:`vim`, there is an integration for
119 :program:`emacs`. It can be found at `clang/tools/clang-format/clang-format.el`
120 and used by adding this to your `.emacs`:
122 .. code-block:: common-lisp
124 (load "<path-to-clang>/tools/clang-format/clang-format.el")
125 (global-set-key [C-M-tab] 'clang-format-region)
127 This binds the function `clang-format-region` to C-M-tab, which then formats the
128 current line or selected region.
134 :program:`clang-format` cannot be used as a text filter with BBEdit, but works
135 well via a script. The AppleScript to do this integration can be found at
136 `clang/tools/clang-format/clang-format-bbedit.applescript`; place a copy in
137 `~/Library/Application Support/BBEdit/Scripts`, and edit the path within it to
138 point to your local copy of :program:`clang-format`.
140 With this integration you can select the script from the Script menu and
141 :program:`clang-format` will format the selection. Note that you can rename the
142 menu item by renaming the script, and can assign the menu item a keyboard
143 shortcut in the BBEdit preferences, under Menus & Shortcuts.
146 Visual Studio Integration
147 =========================
149 Download the latest Visual Studio plugin from the `alpha build site
150 <http://llvm.org/builds/>`_. The default key-binding is Ctrl-R,Ctrl-F.
153 Script for patch reformatting
154 =============================
156 The python script `clang/tools/clang-format-diff.py` parses the output of
157 a unified diff and reformats all contained lines with :program:`clang-format`.
159 .. code-block:: console
161 usage: clang-format-diff.py [-h] [-p P] [-style STYLE]
163 Reformat changed lines in diff.
166 -h, --help show this help message and exit
167 -p P strip the smallest prefix containing P slashes
168 -style STYLE formatting style to apply (LLVM, Google, Chromium, Mozilla,
171 So to reformat all the lines in the latest :program:`git` commit, just do:
173 .. code-block:: console
175 git diff -U0 HEAD^ | clang-format-diff.py -p1
177 The :option:`-U0` will create a diff without context lines (the script would format