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https://github.com/c0r73x/neotags.nvim

Tag highlight in neovim
https://github.com/c0r73x/neotags.nvim

async ctags highlight neovim neovim-plugin

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Tag highlight in neovim

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README 

        
Archived beacuse of lua rewrite https://github.com/c0r73x/neotags.lua



# neotags.nvim



A neovim plugin that generates and highlight ctags similar to easytags.



I wrote this because I didn't like that my vim froze when opening large

projects.



Much of the plugin's speed boost comes from it's ability to filter tags at

runtime. Only tags found in opened buffers are supplied to Neovim for

highlighting. Easytags, on the other hand, supplied all tags found recursively

for a whole project. For very large projects with possibly tens of thousands of

tags, this made Neovim's parser grind to a halt. With the new method, the tag

list is far more manageable.



Be warned that for such large projects it can take some time to process the

list of tags. Fortunately, this is done asynchronously and does not slow the

editor. Furthermore, it is only updated when either a new file is opened or the

buffer is saved. This infrequent time cost is made in place of constantly

forcing Neovim to do the same processing.



![ScreenShot](/screenshot.gif?raw=true)



## Requirements



Neotags requires Neovim with if\_python3, and psutil for Python3.

If `:echo has("python3")` returns `1` and `pip3 list | grep psutil` shows the

psutil package, then you're done; otherwise, see below.



You can enable Python3 interface and psutil with pip:



    pip3 install neovim psutil



If tags processing is taking too long it may be advisable to use pypy3 in

place of python3. This is possible by adding `let g:python3_host_prog = 'pypy3'`

to your `.vimrc`.  Be advised that it will be necessary to have the Neovim

python module and any modules required by any other Vim plugins installed for

pypy3 as well (including psutil).



## Configuration



There are several configuration options to tweak the processing behavior. By

default, to speed things up all standard autotools files (such as configure,

Makefile.in, etc) are ignored by ctags. This behavior can be disabled with by

setting `g:neotags_no_autoconf` to `0`. Further filenames may be ignored by

appending `--exclude=foo` to the ctags argument list (see `man ctags` for more

information).



By default, a tags file is generated in a global directory for each directory

in which source files appear. If you would like to reduce the number of tags

files, and thereby conglomerate a project into one file, you may designate any

directory as a "project" top directory using the `NeotagsAddProject` command.

See below for details.



## Optional C Extension



Because the original implementation in python can take a modestly long time for

very large projects, the section of code that does the tag filtering has been

rewritten in C. If used, this can quite dramatically decrease the waiting time,

often by up to 4+ times.



It can be enabled simply by compiling it. Run `make` in the root git directory

and the small project will be automatically configured, compiled, and installed

into `~/.vim_tags/bin`. The requirements are cmake, libpcre2, and of course

a working C compiler. All of these should be readily available on any Unix like

platform. If you want to install it elsewhere feel free to configure and build

the project yourself. It is also possible to configure with autotools by

running the included `autogen.sh` if you really prefer.



The build process can be easily automated with a package manager such as dein.

Just add



    call dein#add('c0r73x/neotags.nvim', {'build': 'make'})



to your .vimrc or init.nvim file and dein will handle the rest. To disable it

after installing either delete the binary or add `let g:neotags_bin = ''` to

your setup.



As usual, on Windows things are more difficult. It is possible to compile with

MinGW, but the resulting binary is usually slower than the original python! If

you have Visual Studio installed then it is possible to generate a project with

cmake, provided that you can source a copy of `libpcre2-8.lib` or similar from

somewhere. There are no easily available pre-compiled version of this library,

so you'll either have to compile it yourself or download MinGW and use its

pre-compiled version (called `libpcre2-8.dll.a`). Put it in the same directory

as the top `CMakeFiles.txt` file and everything should work. There isn't any

shortcut around this, unfortunately.



If all of this seems like too much bother (especially for Windows users!) then

as mentioned the python version will work perfectly fine, and is probably

plenty fast enough for the majority of cases.



## Commands



| Command                                       | Description                                                         |

| --------------------------------------------- | ------------------------------------------------------------------- |

| `NeotagsToggle`                               | Toggle neotags on the fly                                           |

| `NeotagsAddProject `               | Add a directory to the global list of "project" top directories     |

| `NeotagsRemoveProject `      | Add an extra directory to the current "project"                     |

| `NeotagsRemoveProjectDirectory