This is quite a long post on the topic of working directory and (Neo)vim.
There will be a second part to this story, and maybe a
you ask nicely :)
Introduction: what is the cwd ?
In a command line prompt
cwd is short for “current working directory”.
Every command you run has its own current working directory. When you start a
terminal emulator, your first
cwd is your home directory (
then you can use
cd to change the working directory.
At any time you can display your working dir by typing
pwd, and usually your
prompt is configured to give you this information.
Here the prompt is configured to display the working directory between square brackets:
[/home/user] $ pwd /home/user [/home/user] $ cd /foo/bar [/foo/bar] $ pwd /foo/bar
Setting the working directory allows you (among other things), to type relative paths instead of full paths.
For instance, let’s assume you have some
C code in
need to edit the source code for
bar and its header.
You could run:
[/home/user] $ vim /path/to/foo/src/bar.c [/home/user] $ vim /path/to/foo/src/bar.h
But it’s much more convenient to use:
[/home/user] $ cd /path/to/foo/src [/path/to/foo] $ vim bar.c [/path/to/foo] $ vim bar.h
Vim is no different. When you start vim, it gets the working directory of your
shell. And then you can type commands like
:e to open paths relative to your working directory.
Using the same example, after:
[/home/user] cd /path/to/foo/src [/path/to/foo] vim
you can run
:e bar.c, and then
The problem: working with several directories
This is all well and good, but what happens when you start working on several projects ?
For instance, you could be working on the HTML documentation of your project,
You need to see the
.css files when you are editing the
documentation, but also sometimes you want to have a look at the actual code.
An obvious solution is to create a new tab, with
:tabnew doc, but then if you
want to edit
index.html you have to type
An then if you want to edit the CSS you have to run:
So you have to keep typing
../doc/ and it’s annoying.
My journey to the prefect workflow
I’ve got this issue for years. It’s taken me a long time to find a solution for this problem, so I thought I’d share this process with you.
Step 1: using autochdir
Vim has an option for this. Here’s the documentation:
'autochdir' 'acd' boolean (default off) global When on, Vim will change the current working directory whenever you open a file, switch buffers, delete a buffer or open/close a window. It will change to the directory containing the file which was opened or selected. Note: When this option is on some plugins may not work.
That was my first try.
I think it’s not a good solution (and not only because it’s what Emacs does this by default :P)
Let’s assume your project became more complex, and you start having a
Here’s what your source code looks like:
<foo> src bar.h bar.c baz baz.c doc index.html baz baz.html
When you are editing
bar.h, you can type
:e baz/baz.c and it feels natural.
But then, if you want to go back from
bar.h, you have to use
:e ../bar.h which feels strange…
Worse, let’s assume you have:
/* in baz/baz.h */ #include <bar.h>
You may want to open
bar.h by using
gf, or auto-complete the path to the
CTRL-X CTRL-F, but you can’t since you don’t have the correct
Plus the doc says it may break some plugins…
Step 2: using :cd
Vim has a command to change the working directory as well.
So back to our example, you can do:
:cd /path/to/foo :cd src :e bar.c :e baz/baz.h :tabnew :cd ../doc :e index.html
Well that’s much better! There’s still a problem though:
:cd changes the
working directory for the whole vim process.
So if you run
tabprevious to go back editing the
C code, your working
directory is no longer correct, and you have to re-type
Step 3: using :lcd
Luckily, vim has a command to change the working directory just for the current
:lcd. So I started using that.
And then I realized I often started vim directly from my home directory, so I had to type things like:
:e /path/to/foo/src.c # Ah, I need to change the working directory... :cd /path/to/foo/
That’s awful. You type the same path twice!
Or I used to type:
:cd /path/to/foo/src :e foo.h # Time to fix the doc :tabnew ../doc :cd ../doc # Ah crap, I meant :lcd ...
Step 4: using a custom command
I don’t recall how I found it, but here’s what has been in my
quite some time:
" 'cd' towards the dir in which the current file is edited " but only change the path for the current window map <leader>cd :lcd %:h<CR>
mapdefines a new command
leaderis replaced by what you set with
let mapleader. Default is backlash, but you can use any character for this.
lcdis the command we just talked about
%represents the current file, and what’s after the
:is called a “filename modifier”
his a filename modifier corresponding to the “dirname” of the file
You can see the full list of filename modifiers with
filename-modifiers, and to use them from vimscript you can use the
Well, that’s much better. You can start opening a long path, and then change the working dir without retyping all the path components.
Also, you are always using
:lcd, so you never change the path globally.
This quickly became the shortcut I could no longer live without…
Step 5: using <leader>ew
This is another trick you can use when you know are going to edit a file that is “near” the file you are currently editing, but don’t want to change the working directory at all.
The code looks like this:
" Open files located in the same dir in with the current file is edited map <leader>ew :e <C-R>=expand("%:p:h") . "/" <CR>
<C-R>=is short for
Ctrl-Rfollowed by the equals sign. It allows to enter a vim expression.
expand(%:p:d): we see our
%friend, which still represents the current filename
:p:h: two file modifiers: one to get the full path (
:p), and the other to find the dirname (
- Then we add a
/so that we can start typing the filename right away.
Here’s how you use it
:e /some/long/path/to/foo.c <leader>ew foo.h # opens /some/long/path/to/foo.h
Step 6: using :TabNew
After a while, I realized I really liked having one working directory per tab. I found myself typing stuff like:
:tabnew /some/path :e some-path-at-the-top
cd :e subdir/otherfile.c
I was opening a file at the top of the project just to be able to use my
<leader>cd command and start thinking of better ways.
So finally I came up with a new command:
" Change local working dir upon tab creation function! TabNewWithCwD(newpath) :execute "tabnew " . a:newpath if isdirectory(a:newpath) :execute "lcd " . a:newpath else let dirname = fnamemodify(a:newpath, ":h") :execute "lcd " . dirname endif endfunction command! -nargs=1 -complete=file TabNew :call TabNewWithCwD("<args>")
Hopefully by now you should understand what this does: I create a function that
fnamemodify to get the dirname of the file
I want to open in a new tab, and then calls
:lcd with the correct argument.
Step 7: Switching to Neovim
And then I switched to Neovim, and two things happened:
- 1/ Neovim folks added the
- 2/ They also added the
tcdcommand, which allows to change the working dir just for a tab.
That’s exactly what I needed!
So now my vimrc looks like:
function! OnTabEnter(path) if isdirectory(a:path) let dirname = a:path else let dirname = fnamemodify(a:path, ":h") endif execute "tcd ". dirname endfunction() autocmd TabNewEntered * call OnTabEnter(expand("<amatch>"))
So no matter how I enter a new tab, my working directory is automatically set to the correct location, and when I switch tabs I switch working directories too. Perfect!
Step 8: Fixing vim-fugitive
To conclude my journey, I’d like to share just a tiny bug fix I had to do for using vim-fugitive
It occurred when I was working in a git project, with the Python code in
python/, and the documentation in
I was in my
python/ tab, ran
:Ggrep and suddenly I got results for all
the files in the repositories, including the documentation.
:Ggrep starts by changing the working directory to the top
directory of the current git repository.
Fortunately the fix was easy, here’s my pull request on github.
I don’t know if it will be accepted by Tim Pope, but I hope that now you understand why this is such a big deal for me :)
Thanks for reading!
Thanks for reading this far :)
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