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lh-tags: a ctags wrapper for Vim

Introduction

lh-tags is a ctags wrapper plugin for Vim.

This plugin has two features:

  • The generation of tags files is simplified,
  • and tag selection is simplified (the support for overloads (when overloading is supported) is more ergonomic than what :tselect permits)

Features

Tags generation

  • Is portable: the plugin is regularly used on nixes, windows (with or without cygwin, and with 'shellslash' on).
  • Is incremental: when a file under the watch of lh-tags is modified, only this file is parsed -- its previous information is deleted from the current tags file.
  • Can be run on the while project, when needed
  • Is, of course, parametrisable.

Tags selection

  • Presents all tags that match the selected text (META-W-META-DOWN), or the pattern used (:LHTags).
  • Can hide, or show, functions signatures (on s).
  • Permits to sort the results by Kind, Name, or Filename.
  • Can filter the results on any (ctags) field (kind, name, filename, signature, namespace, ...)
  • The selected tag can be jumped to in the current window (CR, double-click), or in a split window (o) -- the tags stack is updated along the way.

LHTags and filter demo

Usage

In order to use lh-tags, I highly recommend to use a plugin like local_vimrc.

In the buffer local section, you'll have to:

  • adjust (bg):tags_options_{ft} if the default values don't suit you -- I often add exclusion lists in my projects.
  • set b:tags_dirname to the project root directory -- when my projects are compiled with CMake+whatever I use the variables from CMake encapsulation of BuildToolsWrapper to set b:tags_dirname.

For instance, a typical _vimrc_local.vim file will contain:

" Local vimrc variable for source dir
let b:project_sources_dir = g:FooBarProject_config.paths.sources
...
" ======================[ tags generation {{{2
" lh#path#fix() comes from lh-vim-lib
let b:tags_dirname = lh#path#fix(b:project_sources_dir)
let b:tags_options = ' --exclude="*.dox" --exclude="html" --exclude="*.xml" --exclude="*.xsd" --exclude=".*sw*"'
let b:tags_options .= ' --exclude="*.txt" --exclude="cmake" --exclude="*.cmake" --exclude="*.o" --exclude="*.os" --exclude="*.tags" --exclude=tags --exclude="*.tar"'
exe 'setlocal tags+='.(b:tags_dirname).'/tags'

Then, you'll have to generate the tags database once (<C-X>ta), then you can enjoy lh-tag automagic update of the database, and improved tag selection.

Options

  • b:tags_dirname defaults to empty string for the current directory; you'll have to set this option to the root of your project
  • (bg):tags_options defaults to empty string; you'll have to adjust these options to your needs.
  • (bg):tags_options_{ft} defaults to:
    • c: '--c++-kinds=+p --fields=+imaS --extra=+q'
    • cpp: '--c++-kinds=+p --fields=+imaS --extra=+q --language-force=C++'
    • vim: '--fields=+mS --extra=+q'
  • (bg):tags_filename defaults to 'tags'; in case you want your tags file to have another name.
  • (bg):tags_executable defaults to ctags; you should not need to change it.
  • (bg):tags_must_go_recursive defaults to 1; set it to 0 if you really want to not explore subdirectories.
  • (bg):tags_select defaults to 'expand('<cword>')'; this policy says how the current word under the cursor is selected by normal mode mapping META-W-META-DOWN.
  • (bg):LHT_no_auto defaults to 0; set it to 1 if you want to disable the automatic incremental update.
  • (bg):tags_to_spellfile defaults to empty string; this option permits to add all the tags to Vim spellchecker ignore list.
" #### In _vimrc_local.vim
" spell files
setlocal spellfile=
exe 'setlocal spellfile+='.lh#path#fix(b:project_sources_dir).'/ignore.utf-8.add'
let b:tags_to_spellfile = 'code-symbols.utf-8.add'
exe 'setlocal spellfile+='.lh#path#fix(b:project_sources_dir.'/'.b:tags_to_spellfile)

Mappings and commands

  • The tags for the current file can be explicitly updated with CTRL-X_tc -- this mappings defaults to <Plug>CtagsUpdateCurrent

  • All the tags for the current project can be explicitly updated with CTRL-X_ta -- this mappings defaults to <Plug>CtagsUpdateAll

  • Tags matching the current word (or selection) will be presented on META-W-META-DOWN -- these two mappings default to <Plug>CtagsSplitOpen

  • We can also present the tags that match a pattern with :LHTags command (this command supports auto-completion on tag names)

To Do

  • Auto-magically build b:tags_dirname from other variables (&tags with a compatible tags file specified with an absolute path, or root VCS directory)
  • This feature will require background generation for the first time.
  • Have behaviour similar to the one from the quickfix mode (possibility to close and reopen the search window; prev&next moves)
  • Show/hide declarations -- merge declaration and definitions
  • pluggable filters (that will check the number of parameters, their type, etc)

Design Choices

Installation

  • Requirements: Vim 7.+, lh-vim-lib v3.3.0
  • With vim-addon-manager, install lh-tags (this is the preferred method because of the dependencies)
ActivateAddons lh-tags
  • or with vim-flavor which also supports dependencies
flavor 'LucHermitte/lh-tags'
  • or you can clone the git repositories
git clone [email protected]:LucHermitte/lh-vim-lib.git
git clone [email protected]:LucHermitte/lh-tags.git
  • or with Vundle/NeoBundle:
Bundle 'LucHermitte/lh-vim-lib'
Bundle 'LucHermitte/lh-tags'

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