179 lines
7 KiB
ReStructuredText
179 lines
7 KiB
ReStructuredText
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===========
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ClangFormat
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===========
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`ClangFormat` describes a set of tools that are built on top of
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:doc:`LibFormat`. It can support your workflow in a variety of ways including a
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standalone tool and editor integrations.
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Standalone Tool
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===============
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:program:`clang-format` is located in `clang/tools/clang-format` and can be used
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to format C/C++/Obj-C code.
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.. code-block:: console
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$ clang-format -help
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OVERVIEW: A tool to format C/C++/Obj-C code.
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If no arguments are specified, it formats the code from standard input
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and writes the result to the standard output.
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If <file>s are given, it reformats the files. If -i is specified
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together with <file>s, the files are edited in-place. Otherwise, the
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result is written to the standard output.
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USAGE: clang-format [options] [<file> ...]
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OPTIONS:
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Clang-format options:
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-cursor=<uint> - The position of the cursor when invoking
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clang-format from an editor integration
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-dump-config - Dump configuration options to stdout and exit.
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Can be used with -style option.
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-i - Inplace edit <file>s, if specified.
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-length=<uint> - Format a range of this length (in bytes).
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Multiple ranges can be formatted by specifying
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several -offset and -length pairs.
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When only a single -offset is specified without
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-length, clang-format will format up to the end
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of the file.
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Can only be used with one input file.
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-lines=<string> - <start line>:<end line> - format a range of
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lines (both 1-based).
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Multiple ranges can be formatted by specifying
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several -lines arguments.
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Can't be used with -offset and -length.
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Can only be used with one input file.
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-offset=<uint> - Format a range starting at this byte offset.
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Multiple ranges can be formatted by specifying
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several -offset and -length pairs.
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Can only be used with one input file.
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-output-replacements-xml - Output replacements as XML.
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-style=<string> - Coding style, currently supports:
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LLVM, Google, Chromium, Mozilla, WebKit.
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Use -style=file to load style configuration from
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.clang-format file located in one of the parent
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directories of the source file (or current
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directory for stdin).
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Use -style="{key: value, ...}" to set specific
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parameters, e.g.:
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-style="{BasedOnStyle: llvm, IndentWidth: 8}"
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General options:
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-help - Display available options (-help-hidden for more)
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-help-list - Display list of available options (-help-list-hidden for more)
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-version - Display the version of this program
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When the desired code formatting style is different from the available options,
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the style can be customized using the ``-style="{key: value, ...}"`` option or
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by putting your style configuration in the ``.clang-format`` or ``_clang-format``
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file in your project's directory and using ``clang-format -style=file``.
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An easy way to create the ``.clang-format`` file is:
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.. code-block:: console
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clang-format -style=llvm -dump-config > .clang-format
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Available style options are described in :doc:`ClangFormatStyleOptions`.
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Vim Integration
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===============
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There is an integration for :program:`vim` which lets you run the
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:program:`clang-format` standalone tool on your current buffer, optionally
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selecting regions to reformat. The integration has the form of a `python`-file
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which can be found under `clang/tools/clang-format/clang-format.py`.
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This can be integrated by adding the following to your `.vimrc`:
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.. code-block:: vim
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map <C-K> :pyf <path-to-this-file>/clang-format.py<CR>
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imap <C-K> <ESC>:pyf <path-to-this-file>/clang-format.py<CR>i
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The first line enables :program:`clang-format` for NORMAL and VISUAL mode, the
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second line adds support for INSERT mode. Change "C-K" to another binding if
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you need :program:`clang-format` on a different key (C-K stands for Ctrl+k).
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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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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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Emacs Integration
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=================
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Similar to the integration for :program:`vim`, there is an integration for
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:program:`emacs`. It can be found at `clang/tools/clang-format/clang-format.el`
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and used by adding this to your `.emacs`:
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.. code-block:: common-lisp
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(load "<path-to-clang>/tools/clang-format/clang-format.el")
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(global-set-key [C-M-tab] 'clang-format-region)
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This binds the function `clang-format-region` to C-M-tab, which then formats the
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current line or selected region.
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BBEdit Integration
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==================
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:program:`clang-format` cannot be used as a text filter with BBEdit, but works
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well via a script. The AppleScript to do this integration can be found at
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`clang/tools/clang-format/clang-format-bbedit.applescript`; place a copy in
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`~/Library/Application Support/BBEdit/Scripts`, and edit the path within it to
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point to your local copy of :program:`clang-format`.
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With this integration you can select the script from the Script menu and
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:program:`clang-format` will format the selection. Note that you can rename the
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menu item by renaming the script, and can assign the menu item a keyboard
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shortcut in the BBEdit preferences, under Menus & Shortcuts.
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Visual Studio Integration
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=========================
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Download the latest Visual Studio plugin from the `alpha build site
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<http://llvm.org/builds/>`_. The default key-binding is Ctrl-R,Ctrl-F.
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Script for patch reformatting
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=============================
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The python script `clang/tools/clang-format-diff.py` parses the output of
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a unified diff and reformats all contained lines with :program:`clang-format`.
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.. code-block:: console
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usage: clang-format-diff.py [-h] [-p P] [-style STYLE]
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Reformat changed lines in diff.
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optional arguments:
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-h, --help show this help message and exit
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-p P strip the smallest prefix containing P slashes
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-style STYLE formatting style to apply (LLVM, Google, Chromium, Mozilla,
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WebKit)
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So to reformat all the lines in the latest :program:`git` commit, just do:
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.. code-block:: console
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git diff -U0 HEAD^ | clang-format-diff.py -p1
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The :option:`-U0` will create a diff without context lines (the script would format
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those as well).
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