local_vimrc : A project management plugin for Vim

The aim of local_vimrc is to apply settings on files from a same project.

A project is defined by a root directory: everything under the root directory belongs to the project. No need to register every single file in the project, they all belong.

Purpose

This plugin presents a solution to Yakov Lerner's question on Vim ML. It searches for _vimrc_local.vim files in the parents directories and sources the one found.

The Initial Question was:

Is it possible, after sourcing ~/.exrc, to traverse from $HOME down to cwd, and source .exrc from every directory if present ? (And if cwd is not under $HOME, just source ~/.exrc). What do I put into .vimrc to do this ?

Example: current dir is ~/a/b/c. Files are sourced in this order: ~/.exrc, then ~/a/.exrc, ~/a/b/.exrc, ~/a/b/c/.exrc. No messages if some of .exrc does not exist.

Requirements / Installation

The latest version of this script requires vim 7.0 and lh-vim-lib v4.0.0+. UT v0.1.0 will be required to execute the unit tests.

The easiest way to install this plugin is with vim-addon-manager, or other plugin managers based on vim-pi, that support vim-addon-files -- as this script specifies its dependencies in vim-addon-file format.

ActivateAddons local_vimrc

Or with vim-flavor which also supports dependencies:

flavor 'LucHermitte/local_vimrc'

With Vundle

Plugin 'LucHermitte/lh-vim-lib'
Plugin 'LucHermitte/local_vimrc'

Or, with a NeoBundle version that doesn't support vim-pi yet:

set rtp+=~/.vim/bundle/NeoBundle.vim/
call neobundle#begin(expand('~/.vim/bundle'))
NeoBundleFetch 'Shougo/NeoBundle.vim'
" Line required to force the right plugin name -> lh-vim-lib, and not trunk
NeoBundle 'LucHermitte/lh-vim-lib', {'name': 'lh-vim-lib'}
" Note: I haven't found the syntax to merge the two NeoBundle lines into one...
NeoBundle 'LucHermitte/local_vimrc', {'depends': 'lh-vim-lib'}
call neobundle#end()

NeoBundleCheck

Usage

Drop a _vimrc_local.vim file into any project root directory, and write it exactly as you would have written a ftplugin.

`_vimrc_local.vim` content

In other words. The project file is expected to be loaded (/sourced) every time you enter a buffer that corresponds to a file under the project root directory.

As a consequence, you may want to prevent multiple executions of parts the sourced file: almost everything shall remain identical and shall not need to be reset. However some plugins, like alternate (a.vim), rely on global variables to tune their behaviour. The settings (global variables) related to those plugins will require you to update their value every time -- if you expect to have settings that differ from a project to another. In order to support such project-aware setting, local_vimrc lets you in charge of handling anti-reinclusion guards in project configuration files.

For your project settings prefer buffer-local mappings (:h :map-<buffer>), abbreviations (:h :abbreviate-<buffer>), commands (:h :command-buffer), menus (see my fork of buffer-menu), settings (:h :setlocal), and variables (:h local-variable).

N.B.: if you are a plugin writer that want to support configuration variables that'll dynamically adapt to the current project settings, have a look at my lh#option#get() and lh#ft#option#get() functions.

You'll find examples of use in my dedicated repository.

Options

The behaviour of this plugin can be tuned with the following options:

g:local_vimrc variable specifies the filenames and filepaths to be searched. The default is "_vimrc_local.vim". It can contain a list (:h List) of pathnames, or a simple string. It's meant to contain something that'll be relative to your current project root.
This can contain a directory or a list of directories. In that case, in order to find any file named _vimrc_local.vim in directories named .config/ at the root of current project directory, set the variable to
```
let g:local_vimrc = ['.config', '_vimrc_local.vim']
```
g:local_vimrc_options dictionary will hold four lists (whitelist, blacklist, asklist, and sandboxlist) that define how security issues are handled. See Security concerns.

Other Features

Per-project settings and Template Expander Plugins

Sometimes we want to set variables (like a project source directory, or specific template files that override the default project file headers) before other plugins are triggered.
The typical use case will be from the shell:

# There is a _vimrc_local.vim file in /path/to/myproject/
cd /path/to/myproject/submodule42
gvim foobar.h

In order to use myproject settings (naming styles, header guards naming policy, ...), the vimrc_local file needs to be sourced before any template-file is expanded.

This plugin provides the :SourceLocalVimrc command for this purpose. It's up to the Template Expander Plugin to exploit this feature -- as this moment, only my fork of mu-template does.

Automatic increment of `vimrc_local` script version number

When saved, if the vimrc_local script has a s:k_version variable, it will be incremented automatically. This variable is meant to avoid multiple inclusions of the script for a given buffer. New vimrc_local scripts created with the help of the templates provided with my mu-template fork are making use of this variable.

Security concerns

Thanks to the option g:local_vimrc_options, it's possible to tune which _vimrc_local files are sourced, and how.

The lists

The four lists g:local_vimrc_options.whitelist, g:local_vimrc_options.blacklist, g:local_vimrc_options.asklist, and g:local_vimrc_options.sandboxlist, will hold lists of pathname patterns. Depending on the kind of the pattern that is the best match for the current _vimrc_local file, the file will be either:

sourced, if it belongs to the whitelist,
ignored, if it belongs to the blacklist,
sourced, if it belongs to the asklist and if the end user says "Yes please, source this file!",
sourced in the sandbox (:h sandbox) if it belongs to the sandboxlist.
or sourced if it belongs to no list (and if it's a local file, and not a file accessed through scp://, http://, ...).

Default settings

Any _vimrc_local file in $HOME/.vim/ will be sourced.
However, files in $HOME/.vim/ subdirectories will be ignored. This way, the end-user may specify options to use when editing vim files. See the file I use for instance.
_vimrc_local files under $HOME are sourced only if the end-user interactively says "yes".
_vimrc_local files under $HOME/.. are ignored.

Tuning the lists

In order to blindly accept _vimrc_local files from projects your are working on, you'll have to add this kind of lines into your .vimrc, after this plugin has been loaded:

" Sourcing the plugin
ActivateAddons local_vimrc
...
" Let's assume you put all projects you are working on in your
" corporation under $HOME/dev/my_corporation/
call lh#local_vimrc#munge('whitelist', $HOME.'/dev/my_corporation')
" But projects from 3rd parties/projects downloaded from the internet go
" into $HOME/dev/3rdparties/
call lh#local_vimrc#munge('blacklist', $HOME.'/dev/3rdparties')

If you want to override default settings, change them in your .vimrc after this plugin has been loaded. e.g.:

ActivateAddons local_vimrc
...
" Remove $HOME from the asklist,
call lh#local_vimrc#filter_list('asklist', 'v:val != $HOME')
" Add it in the sandbox list instead
call lh#local_vimrc#munge('sandboxlist', $HOME)

" Clean the whitelist
let lh#local_vimrc#lists().whitelist = []

Alternatives

To be fair, there exist alternatives.

Modelines

Modelines are particularly limited:

We can't set variables (that tunes other (ft)plugins, like "should the braces of the for-snippet be on a newline ?"),
nor call functions from modelines (I don't limit myself to coding standards, I also set the makefile to use depending on the current directory)
Modelines aren't DRY. With modelines, a setting needs to be repeated in every file, if there are too many things to set or tunings to change, it will quickly become difficult to maintain, moreover, it will require the use of a template-expander plugin (which you should consider if you have several vimmers in your project).
Not every one uses Vim to develop. I don't want to be bothered by other people editor settings, why should I parasite theirs with modelines ?

`.exrc`

Vim natively supports .exrc files (:h .exrc, § d-) when 'exrc' is on. This solution is very similar to local_vimrc. However .exrc files are executed (sourced in Vim jargon) only on buffers (corresponding to files) which are in the exact same directory. Files in subdirectories won't trigger the execution of the project .exrc file.

Autocommands

It's possible to add autocommands in our .vimrc. Autocommands that will detect files under a certain directory to trigger commands (:set xxxxx, :let b:style='alman', :source path/to/project_config.vim, ...).

If the autocommand executes simple commands (instead of sourcing a file), the solution won't scale when new commands will need to be added.

Autocommands won't scale either as a project location may vary :

On several machines a project may not be stored in the same path ;
When branches are stored in different paths, the .vimrc may need to be tuned for each branch ;
When several people are using Vim, it's easier to ask them to install a same plugin instead of asking them to maintain and adapt their respective .vimrc

Project plugin

There exist a quite old (which does NOT mean bad) plugin dedicated to the management of project configuration. I've never used it, I won't be able to tell you why local_vimrc solution is better or not.

Plugins similar to local_vimrc

There exist many plugins with the same name or even with similar purpose. Just to name a few, there is for instance:

Project oriented plugins:
- Aric Blumer's good old project.vim plugin #69 which addresses other project concerns.
- Tim Pope's Projectionist #4989,
- Vim plugin for EditorConfig -- I plan eventually to provide a way to set project variables for this plugin,
- My lh-vim-lib library plugin provides a new way to define projects and to tune plugins on a per project basis. For more complex plugins, both approaches can be mixed.
local-vimrc plugins:
- Marc Weber's vim-addon-local-vimrc
- Markus "embear" Braun's local_vimrc #441,
- thinca's localrc.vim #3393,
- Tye Zdrojewski's Directory specific settings #1860.

TO DO

Document how local_vimrc can be used with BuildToolsWrapper to support CMake based projects.
Document how to mix definitions that need to be sourced only once, and local_vimrc
doc&test: Support the definition of the project configuration in files put a separate directory (in order to help versioning them).
doc: Support List of possible names for vimrc_local scripts
Support checksum for project configuration from external sources

History

v2.2.11
- BUG: Use is_eligible on the right pathname (PR#12)
- ENH: Don't source anything on directories
- ENH: Don't source multiple times in a row with a same buffer
- ENH: Improve logs
- DOC: Miscelleanous improvments
v2.2.10
- ENH: Add 'edit local vimrc' in menu
- ENH: Ignore buffer when ! lh#project#is_eligible()
- ENH: Abort of quickfix and fugitive paths
- PERF: Improve vim startup time
v2.2.9 ENH: Simplify permission list management
v2.2.8 BUG: Fix regression to support Vim7.3
v2.2.7 ENH: Listen for BufRead and BufNewFile
v2.2.6 ENH: Use lhvl 4.0.0 permission lists
This implicitly fix asklist management
v2.2.5 BUG: Fix #7 -- support of config in directory
v2.2.4 Use new logging framework
Fix issue when g:local_vimrc is a string.
v2.2.3 Merge pull requests:
- Incorrect addon-info extension (txt -> json)
- Fix :SourceLocalVimrc path
v2.2.2 Directory lists were incorrectly sorted (bis) + shellslash isssue
v2.2.1 Directory lists were incorrectly sorted
v2.2.0 Plugins functions moved to autoload.
Verbose mode is activated by calling lh#local_vimrc#verbose(1)
v2.1.1 Bug fix in support of regex in white/black/... lists.
v2.1.0 Whitelist, blacklist & co
Requires lh-vim-lib 3.2.4
v2.0.1 Updated to match changes in lh-vim-lib 3.2.2.
v2.0 Code refactored.
-> Search function deported to lh-vim-lib
-> dependencies to vim7 and to lh-vim-lib introduced
Support for directory of local_vimrc_files added.
v1.12 Previous versions of the plugin were hosted on my google-code / lh-misc repository.
v1.11 Less errors are printed when the file loaded contains errors.
v1.10 s:k_version in vimrc_local files is automatically incremented on saving.
v1.9 New command :SourceLocalVimrc in order to explicitly load the local-vimrc file before creating new files from a template (We can't just rely on BufNewFile as there is no guaranty vimrc_local's BufNewFile will be called before the one from the Template Expander Plugin => it's up to the TEP to call the function).
v1.8 No more infinite recursion on file in non existent paths. + patch from cristiklein to support paths with spaces
v1.7 Don't search a local vimrc with remote paths (ftp://, http, ... )
v1.6 Sometimes root path is Z:\, which is quite odd
v1.5 The auto-command is moved to the au-group LocalVimrc
v1.4 Stop the recursion when we get to // or \\ (UNC paths)
v1.3 More comments.
Trace of the directories searched when 'verbose' >= 2
v1.2 Stops at $HOME or at root (/)
v1.1 Uses _vimrc_local.vim
v1.0 Initial solution

simlei/local_vimrc