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https://github.com/dan-t/rusty-tags

Create ctags/etags for a cargo project
https://github.com/dan-t/rusty-tags

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Create ctags/etags for a cargo project

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rusty-tags

==========



A command line tool that creates [tags](https://en.wikipedia.org/wiki/Ctags) - for source code navigation by

using [ctags]() - for a [cargo]() project, all

of its direct and indirect dependencies and the rust standard library.



Prerequisites

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



* [ctags]() installed, needs a version with the `--recurse` flag



On a linux system the package is most likely called `exuberant-ctags`.



Otherwise you can get the sources directly from [here](http://ctags.sourceforge.net/) or use the newer and alternative

[universal-ctags](https://github.com/universal-ctags/ctags).



Only `universal-ctags` will add tags for struct fields and enum variants.



Installation

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



    $ cargo install rusty-tags



The build binary will be located at `~/.cargo/bin/rusty-tags`.



Usage

=====



Just calling `rusty-tags vi` or `rusty-tags emacs` anywhere inside

of the cargo project should just work.



After its run a `rusty-tags.vi / rusty-tags.emacs` file should be beside of the

`Cargo.toml` file.



Additionally every dependency gets a tags file at its source directory, so

jumping further to its dependencies is possible.



Rust Standard Library Support

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



Tags for the standard library are created if the rust source is supplied by

defining the environment variable `RUST_SRC_PATH`.



These tags aren't automatically added to the tags of the cargo project and have

to be added manually with the path `$RUST_SRC_PATH/rusty-tags.vi` or

`$RUST_SRC_PATH/rusty-tags.emacs`.



If you're using [rustup]() you can get the

rust source of the currently used compiler version by calling:



    $ rustup component add rust-src



And then setting `RUST_SRC_PATH` inside of e.g. `~/.bashrc`.



For `rustc >= 1.47.0`:



    $ export RUST_SRC_PATH=$(rustc --print sysroot)/lib/rustlib/src/rust/library/



For `rustc < 1.47.0`:



    $ export RUST_SRC_PATH=$(rustc --print sysroot)/lib/rustlib/src/rust/src/



Configuration

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



The current supported configuration at `~/.rusty-tags/config.toml` (defaults displayed):



    # the file name used for vi tags

    vi_tags = "rusty-tags.vi"



    # the file name used for emacs tags

    emacs_tags = "rusty-tags.emacs"



    # the name or path to the ctags executable, by default executables with names

    # are searched in the following order: "ctags", "exuberant-ctags", "exctags", "universal-ctags", "uctags"

    ctags_exe = ""



    # options given to the ctags executable

    ctags_options = ""



Vim Configuration

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



Put this into your `~/.vimrc` file:



    autocmd BufRead *.rs :setlocal tags=./rusty-tags.vi;/



Or if you've supplied the rust source code by defining `RUST_SRC_PATH`:



    autocmd BufRead *.rs :setlocal tags=./rusty-tags.vi;/,$RUST_SRC_PATH/rusty-tags.vi



And:



    autocmd BufWritePost *.rs :silent! exec "!rusty-tags vi --quiet --start-dir=" . expand('%:p:h') . "&" | redraw!



Emacs Configuration

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



Install [counsel-etags](https://github.com/redguardtoo/counsel-etags).



Create file `.dir-locals.el` in rust project root (please note the line to set `counsel-etags-extra-tags-files` is optional):



    ((nil . ((counsel-etags-update-tags-backend . (lambda (src-dir) (shell-command "rusty-tags emacs")))

             (counsel-etags-extra-tags-files . ("~/third-party-lib/rusty-tags.emacs" "$RUST_SRC_PATH/rusty-tags.emacs"))

             (counsel-etags-tags-file-name . "rusty-tags.emacs"))))



Use `M-x counsel-etags-find-tag-at-point` for code navigation.



`counsel-etags` will automatically detect and update tags file in project root. So no extra setup is required.



Sublime Configuration

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



The plugin [CTags](https://github.com/SublimeText/CTags) uses vi style tags, so

calling `rusty-tags vi` should work.



By default it expects tag files with the name `.tags`, which can be set

in `~/.rusty-tags/config.toml`:



    vi_tags = ".tags"



Or by calling `rusty-tags vi --output=".tags"`.



MacOS Issues

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



Mac OS users may encounter problems with the execution of `ctags` because the shipped version

of this program does not support the recursive flag. See [this posting]()

for how to install a working version with homebrew.



Cygwin/Msys Issues

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



If you're running [Cygwin]() or [Msys]() under Windows,

you might have to set the environment variable `$CARGO_HOME` explicitly. Otherwise you might get errors

when the tags files are moved.