# Vim documentation: ft_rust

main help file

    *ft_rust.txt*	Filetype plugin for Rust

    ==============================================================================

    CONTENTS					*rust*

    1. Introduction					|rust-intro|
    2. Settings					|rust-settings|
    3. Commands					|rust-commands|
    4. Mappings					|rust-mappings|

    ==============================================================================

    INTRODUCTION					*rust-intro*

    This plugin provides syntax and supporting functionality for the Rust
    filetype.

    ==============================================================================

    SETTINGS					*rust-settings*

    This plugin has a few variables you can define in your vimrc that change the
    behavior of the plugin.

    Some variables can be set buffer local (`b:` prefix), and the buffer local
    will take precedence over the global `g:` counterpart.

    						*g:rustc_path*
    g:rustc_path
    	Set this option to the path to rustc for use in the |:RustRun| and
    	|:RustExpand| commands.  If unset, "rustc" will be located in $PATH:
    		let g:rustc_path = $HOME."/bin/rustc"

    						*g:rustc_makeprg_no_percent*
    g:rustc_makeprg_no_percent
    	Set this option to 1 to have 'makeprg' default to "rustc" instead of
    	"rustc %":
    		let g:rustc_makeprg_no_percent = 1

    						*g:rust_conceal*
    g:rust_conceal
    	Set this option to turn on the basic |conceal| support:
    		let g:rust_conceal = 1

    						*g:rust_conceal_mod_path*
    g:rust_conceal_mod_path
    	Set this option to turn on |conceal| for the path connecting token "::":
    		let g:rust_conceal_mod_path = 1

    						*g:rust_conceal_pub*
    g:rust_conceal_pub
    	Set this option to turn on |conceal| for the "pub" token:
    		let g:rust_conceal_pub = 1

    						*g:rust_recommended_style*
    g:rust_recommended_style
    	Set this option to enable vim indentation and textwidth settings to
    	conform to style conventions of the Rust style guide (i.e. use 4
    	spaces for indents and set 'textwidth' to 100).  This option is
    	enabled by default.  To disable it:
    		let g:rust_recommended_style = 0

    						*g:rust_fold*
    g:rust_fold
    	Set this option to turn on YXXYfolding|:
    		let g:rust_fold = 1

    	Value	Effect
    	0	No folding
    	1	Braced blocks are folded.  All folds are open by default.
    	2	Braced blocks are folded. 'foldlevel' is left at the global
    		value (all folds are closed by default).

    						*g:rust_bang_comment_leader*
    g:rust_bang_comment_leader
    	Set this option to 1 to preserve the leader on multi-line doc comments
    	using the /*! syntax:
    		let g:rust_bang_comment_leader = 1

    						*g:rust_use_custom_ctags_defs*
    g:rust_use_custom_ctags_defs
    	Set this option to 1 if you have customized ctags definitions for Rust
    	and do not wish for those included with rust.vim to be used:
    		let g:rust_use_custom_ctags_defs = 1

    	NOTE: rust.vim's built-in definitions are only used for the Tagbar Vim
    	plugin, if you have it installed, AND if Universal Ctags is not
    	detected.  This is because Universal Ctags already has built-in
    	support for Rust when used with Tagbar.

    	Also, note that when using ctags other than Universal Ctags, it is not
    	automatically used when generating |tags| files that Vim can use to
    	navigate to definitions across different source files.  Feel free to
    	copy `rust.vim/ctags/rust.ctags` into your own `~/.ctags` if you wish
    	to generate |tags| files.

    						*g:ftplugin_rust_source_path*
    g:ftplugin_rust_source_path
    	Set this option to a path that should be prepended to 'path' for Rust
    	source files:
    		let g:ftplugin_rust_source_path = $HOME.'/dev/rust'

    						*g:rustfmt_command*
    g:rustfmt_command
    	Set this option to the name of the "rustfmt" executable in your $PATH.
    	If not specified it defaults to "rustfmt":
    		let g:rustfmt_command = 'rustfmt'

    						*g:rustfmt_autosave*

    						*b:rustfmt_autosave*
    g:rustfmt_autosave
    	Set this option to 1 to run |:RustFmt| automatically when saving a
    	buffer.  If not specified it defaults to 0:
    		let g:rustfmt_autosave = 0

    	There is also a buffer-local b:rustfmt_autosave that can be set for
    	the same purpose, and can override the global setting.

    					*g:rustfmt_autosave_if_config_present*

    					*b:rustfmt_autosave_if_config_present*
    g:rustfmt_autosave_if_config_present
    	Set this option to 1 to have |b:rustfmt_autosave| be set automatically
    	if a `rustfmt.toml` file is present in any parent directory leading to
    	the file being edited.  If not set, default to 0:
    		let g:rustfmt_autosave_if_config_present = 0

    	This is useful to have `rustfmt` only execute on save, on projects
    	that have `rustfmt.toml` configuration.

    	There is also a buffer-local b:rustfmt_autosave_if_config_present
    	that can be set for the same purpose, which can override the global
    	setting.

    						*g:rustfmt_fail_silently*
    g:rustfmt_fail_silently
    	Set this option to 1 to prevent "rustfmt" from populating the
    	|location-list| with errors.  If not specified it defaults to 0:
    		let g:rustfmt_fail_silently = 0

    						*g:rustfmt_options*
    g:rustfmt_options
    	Set this option to a string of options to pass to "rustfmt".
    	The write-mode is already set to "overwrite".  If not specified it
    	defaults to '':
    		let g:rustfmt_options = ''

    						*g:rustfmt_emit_files*
    g:rustfmt_emit_files
    	If not specified rust.vim tries to detect the right parameter to
    	pass to rustfmt based on its reported version.  Otherwise, it
    	determines whether to run rustfmt with "--emit=files" (when 1 is
    	provided) instead of "--write-mode=overwrite".
    		let g:rustfmt_emit_files = 0

    						*g:rustfmt_detect_version*
    g:rustfmt_detect_version
    	When set to 1, will try to parse the version output from "rustfmt".
    	Disabled by default for performance reasons.
    		let g:rustfmt_detect_version = 1

    						*g:rustfmt_find_toml*
    g:rustfmt_find_toml
    	When set to 1, will try to find `rustfmt.toml` file by searching from
    	current path upwards.  Disabled by default for performance reasons.
    		let g:rustfmt_find_toml = 1

    						*g:rust_playpen_url*
    g:rust_playpen_url
    	Set this option to override the url for the playpen to use:
    		let g:rust_playpen_url = 'https://play.rust-lang.org/'

    						*g:rust_shortener_url*
    g:rust_shortener_url
    	Set this option to override the url for the url shortener:
    		let g:rust_shortener_url = 'https://is.gd/'

    						*g:rust_clip_command*
    g:rust_clip_command
    	Set this option to the command used in your OS to copy the Rust Play
    	url to the clipboard:
    		let g:rust_clip_command = 'xclip -selection clipboard'

    						*g:cargo_makeprg_params*
    g:cargo_makeprg_params
    	Set this option to the string of parameters to pass to cargo.  If not
    	specified it defaults to "$*":
    		let g:cargo_makeprg_params = 'build'

    						*g:cargo_shell_command_runner*
    g:cargo_shell_command_runner
    	Set this option to change how to run shell commands for cargo commands
    	|:Cargo|, |:Cbuild|, |:Crun|, etc. - see |rust-commands|.
    	By default, |:terminal| is used to run a shell command in a terminal
    	window asynchronously.  But if you prefer |:!| for running the
    	commands, it can be specified:
    		let g:cargo_shell_command_runner = '!'

    Integration with Syntastic			*rust-syntastic*

    This plugin automatically integrates with the Syntastic checker.  There are
    two checkers provided: "rustc", and "cargo".  The latter invokes "cargo" to
    build code, and the former delivers a single edited ".rs" file as a
    compilation target directly to the Rust compiler, `rustc`.

    Because Cargo is almost exclusively being used for building Rust code these
    days, "cargo" is the default checker.

    	let g:syntastic_rust_checkers = ['cargo']

    If you would like to change it, you can set `g:syntastic_rust_checkers` to a
    different value.

    					*g:rust_cargo_avoid_whole_workspace*

    					*b:rust_cargo_avoid_whole_workspace*
    g:rust_cargo_avoid_whole_workspace
    	When editing a crate that is part of a Cargo workspace, and this
    	option is set to 1 (the default), then "cargo" will be executed
    	directly in that crate directory instead of in the workspace
    	directory.  Setting 0 prevents this behavior - however be aware that
    	if you are working in a large workspace, Cargo commands may take more
    	time, plus the Syntastic error list may include all the crates in the
    	workspace.
    		let g:rust_cargo_avoid_whole_workspace = 0

    					*g:rust_cargo_check_all_targets*

    					*b:rust_cargo_check_all_targets*
    g:rust_cargo_check_all_targets
    	When set to 1, the `--all-targets` option will be passed to cargo when
    	Syntastic executes it, allowing the linting of all targets under the
    	package.
    	The default is 0.

    					*g:rust_cargo_check_all_features*

    					*b:rust_cargo_check_all_features*
    g:rust_cargo_check_all_features
    	When set to 1, the `--all-features` option will be passed to cargo when
    	Syntastic executes it, allowing the linting of all features of the
    	package.
    	The default is 0.

    					*g:rust_cargo_check_examples*

    					*b:rust_cargo_check_examples*
    g:rust_cargo_check_examples
    	When set to 1, the `--examples` option will be passed to cargo when
    	Syntastic executes it, to prevent the exclusion of examples from
    	linting.  The examples are normally under the `examples/` directory of
    	the crate.
    	The default is 0.

    					*g:rust_cargo_check_tests*

    					*b:rust_cargo_check_tests*
    g:rust_cargo_check_tests
    	When set to 1, the `--tests` option will be passed to cargo when
    	Syntastic executes it, to prevent the exclusion of tests from linting.
    	The tests are normally under the `tests/` directory of the crate.
    	The default is 0.

    					*g:rust_cargo_check_benches*

    					*b:rust_cargo_check_benches*
    g:rust_cargo_check_benches
    	When set to 1, the `--benches` option will be passed to cargo when
    	Syntastic executes it.  The benches are normally under the `benches/`
    	directory of the crate.
    	The default is 0.

    Integration with auto-pairs		*rust-auto-pairs*

    This plugin automatically configures the auto-pairs plugin not to duplicate
    single quotes, which are used more often for lifetime annotations than for
    single character literals.

    					*g:rust_keep_autopairs_default*
    g:rust_keep_autopairs_default
    	Don't override auto-pairs default for the Rust filetype.  The default
    	is 0.

    ==============================================================================

    COMMANDS						*rust-commands*

    Invoking Cargo

    This plugin defines very simple shortcuts for invoking Cargo from within Vim.

    :Cargo <args>						*:Cargo*
    		Runs "cargo" with the provided arguments.

    :Cbuild <args>						*:Cbuild*
    		Shortcut for "cargo build".

    :Cclean <args>						*:Cclean*
    		Shortcut for "cargo clean".

    :Cdoc <args>						*:Cdoc*
    		Shortcut for "cargo doc".

    :Cinit <args>						*:Cinit*
    		Shortcut for "cargo init".

    :Crun <args>						*:Crun*
    		Shortcut for "cargo run".

    :Ctest <args>						*:Ctest*
    		Shortcut for "cargo test".

    :Cupdate <args>						*:Cupdate*
    		Shortcut for "cargo update".

    :Cbench <args>						*:Cbench*
    		Shortcut for "cargo bench".

    :Csearch <args>						*:Csearch*
    		Shortcut for "cargo search".

    :Cpublish <args>					*:Cpublish*
    		Shortcut for "cargo publish".

    :Cinstall <args>					*:Cinstall*
    		Shortcut for "cargo install".

    :Cruntarget <args>					*:Cruntarget*
    		Shortcut for "cargo run --bin" or "cargo run --example",
    		depending on the currently open buffer.

    Formatting

    :RustFmt						*:RustFmt*
    		Runs |g:rustfmt_command| on the current buffer.  If
    		|g:rustfmt_options| is set then those will be passed to the
    		executable.

    		If |g:rustfmt_fail_silently| is 0 (the default) then it
    		will populate the |location-list| with the errors from
    		|g:rustfmt_command|.  If |g:rustfmt_fail_silently| is set to 1
    		then it will not populate the |location-list|.

    :RustFmtRange						*:RustFmtRange*
    		Runs |g:rustfmt_command| with selected range.  See |:RustFmt|
    		for any other information.

    Playpen integration

    :RustPlay						*:RustPlay*
    		This command will only work if you have web-api.vim installed
    		(available at https://github.com/mattn/webapi-vim).  It sends
    		the current selection, or if nothing is selected, the entirety
    		of the current buffer to the Rust playpen, and emits a message
    		with the shortened URL to the playpen.

    		|g:rust_playpen_url| is the base URL to the playpen, by default
    		"https://play.rust-lang.org/".

    		|g:rust_shortener_url| is the base url for the shortener, by
    		default "https://is.gd/"

    		|g:rust_clip_command| is the command to run to copy the
    		playpen url to the clipboard of your system.

    Evaluation of a single Rust file

    NOTE: These commands are useful only when working with standalone Rust files,
    which is usually not the case for common Rust development.  If you wish to
    build Rust crates from within Vim, use Vim's make, Syntastic, or functionality
    from other plugins.

    :RustRun  [args]					*:RustRun*
    :RustRun! [rustc-args] [--] [args]
    		Compiles and runs the current file.  If it has unsaved
    		changes, it will be saved first using |:update|.  If the
    		current file is an unnamed buffer, it will be written to a
    		temporary file first.  The compiled binary is always placed in
    		a temporary directory, but is run from the current directory.

    		The arguments given to |:RustRun| will be passed to the
    		compiled binary.

    		If ! is specified, the arguments are passed to rustc instead.
    		A "--" argument will separate the rustc arguments from the
    		arguments passed to the binary.

    		If |g:rustc_path| is defined, it is used as the path to rustc.
    		Otherwise it is assumed rustc can be found in $PATH.

    :RustExpand  [args]					*:RustExpand*
    :RustExpand! [TYPE] [args]
    		Expands the current file using --pretty and displays the
    		results in a new split.  If the current file has unsaved
    		changes, it will be saved first using |:update|.  If the
    		current file is an unnamed buffer, it will be written to a
    		temporary file first.

    		The arguments given to |:RustExpand| will be passed to rustc.
    		This is largely intended for specifying various --cfg
    		configurations.

    		If ! is specified, the first argument is the expansion type to
    		pass to rustc --pretty.  Otherwise it will default to
    		"expanded".

    		If |g:rustc_path| is defined, it is used as the path to rustc.
    		Otherwise it is assumed rustc can be found in $PATH.

    :RustEmitIr [args]					*:RustEmitIr*
    		Compiles the current file to LLVM IR and displays the results
    		in a new split.  If the current file has unsaved changes, it
    		will be saved first using |:update|.  If the current file is an
    		unnamed buffer, it will be written to a temporary file first.

    		The arguments given to |:RustEmitIr| will be passed to rustc.

    		If |g:rustc_path| is defined, it is used as the path to rustc.
    		Otherwise it is assumed rustc can be found in $PATH.

    :RustEmitAsm [args]					*:RustEmitAsm*
    		Compiles the current file to assembly and displays the results
    		in a new split.  If the current file has unsaved changes, it
    		will be saved first using |:update|.  If the current file is an
    		unnamed buffer, it will be written to a temporary file first.

    		The arguments given to |:RustEmitAsm| will be passed to rustc.

    		If |g:rustc_path| is defined, it is used as the path to rustc.
    		Otherwise it is assumed rustc can be found in $PATH.

    Running test(s)

    :[N]RustTest[!] [options]				*:RustTest*
    		Runs a test under the cursor when the current buffer is in a
    		cargo project with "cargo test" command.  If the command did
    		not find any test function under the cursor, it stops with an
    		error message.

    		When N is given, adjust the size of the new window to N lines
    		or columns.

    		When ! is given, runs all tests regardless of current cursor
    		position.

    		When [options] is given, it is passed to "cargo" command
    		arguments.

    		When the current buffer is outside a cargo project, the
    		command runs "rustc --test" command instead of "cargo test" as
    		fallback.  All tests are run regardless of adding ! since
    		there is no way to run specific test function with rustc.
    		[options] is passed to "rustc" command arguments in that case.

    		Takes optional modifiers (see |<mods>|):
    			:tab RustTest
    			:belowright 16RustTest
    			:leftabove vert 80RustTest

    rust.vim Debugging

    :RustInfo						*:RustInfo*
    		Emits debugging info of the Vim Rust plugin.

    :RustInfoToClipboard					*:RustInfoClipboard*
    		Saves debugging info of the Vim Rust plugin to the default
    		register.

    :RustInfoToFile [filename]				*:RustInfoToFile*
    		Saves debugging info of the Vim Rust plugin to the given file,
    		overwriting it.

    ==============================================================================

    MAPPINGS						*rust-mappings*

    This plugin defines Normal mode, Visual mode, and Operator-pending mode
    mappings for |[[| and |]]| to support hanging indents.

    ==============================================================================
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