19 votes
Accepted

Talking to vim from outside

If you launch your first Vim session with the argument --servername VIM: $ vim --servername VIM then you can send any command from any other shell with the argument --remote-send. For example, if ...
user avatar
  • 5,888
17 votes
Accepted

How do I use a variable or return value in option, command, or mapping?

The reason your example attempts don't work is that in many locations text is simply seen as a literal string, rather than VimScript. So functions, variables, and the like don't work. For example, if ...
user avatar
  • 21.4k
14 votes

`set` option with variables

You could use :exe, but this is extremely cumbersome to use and you'll need to escape a few things. I used to use my own path fixing function. It looked like: exe 'set rtp+='.lh#path#fix(...
user avatar
  • 16.2k
12 votes
Accepted

Why is `let foo = $HOME/bar` invalid?

VimScript is more of a programming language. So the following won't work just like in C. let foo = $HOME/bar It's division. let foo = "$HOME/bar" Inside quoted string only "...
user avatar
  • 16.9k
11 votes
Accepted

How can I use the return value of a function in a :set command?

You can use :let with Vim options as well, by prefixing the option name with a & sigil; cp. :help :let-option let &tags = getcwd().'\tags' Note that the literal string must be in single ...
user avatar
  • 16.9k
10 votes

Can I do array destructuring in VimL?

Yes you can, but Vim calls it list unpacking. It can be found in Vim's help: :h let-unpack Vim allows you to create and populate two variables from a list: let [var1, var2] = mylist which is ...
user avatar
  • 3,442
9 votes
Accepted

Use variable for mapping inside vimrc

The :map command takes :help key-notation, but not variables. Vimscript is evaluated exactly like the Ex commands typed in the : command-line. There were no variables in ex, so there's no way to ...
user avatar
  • 16.9k
9 votes
Accepted

Are the internal g:, b:, w:, etc dictionaries documented?

Poking around with :helpgrep \<g:\A, I found this is documented under :help internal-variables: There are several name spaces for variables. Which one is to be used is specified by what is ...
user avatar
  • 10.4k
9 votes
Accepted

VimL/Vimscript: how to access local variable of outer function from its inner function?

I though it wasn't possible, but I was wrong. See :h :func-closure You need to patch two things: add closure at the end of the inner of the function declaration respect the usual naming conventions ...
user avatar
  • 16.2k
8 votes
Accepted

How can I use consecutive numbers in an Ex-style substitute command?

This command does what you want: :let i = 1|g/^Do/s/^/\=i/|let i = i + 1 Explanation… let i = 1 initializes counter i, g/^Do/s/^/\=i/ prepends i to each line starting with Do, let i = i + 1 ...
user avatar
  • 33.1k
8 votes
Accepted

How to generate a string by concatenating another string with an environment variable

In vim dot is a concatenation operator: let repo = $Project . '/cfora' To "refer" variable in the string, well, in your case it is just a concatenation again: exe '!cmake ' . repo PS I would ...
user avatar
  • 10.4k
8 votes
Accepted

How can I access buffer variables from BufUnload/BufDelete?

Use :h <afile> to get unloading buffer name, use :h getbufvar() to get buffer local variable. let b:example_tempfile = tempname() augroup example au! au BufUnload <buffer> echom ...
user avatar
  • 5,908
7 votes
Accepted

Append to global variable and completion

You could have your variable be a list and add values with :let g:var += ['item']. However, it won't be possible to prevent the same item to be added several times. That's why I've come up with lh#...
user avatar
  • 16.2k
7 votes
Accepted

How to quickly edit vim variable content?

You've picked an unfortunate example, as it's more easily achieved with: let myvar .= 'bar' Still, for more complicated edits, you could use the following commands: Insert the variable into the ...
user avatar
  • 27.9k
6 votes

`set` option with variables

You could use an environment variable defined within your current shell session. let $myvimdir = '/home/abc/vimfiles' That way you can use other variables to compose the path as well: let $myvimdir ...
user avatar
  • 61
6 votes
Accepted

How can I use a string variables for filepath in vimscript map command?

One method is to use a <expr> mapping which evaluates the RHS of the mapping as Vimscript rather than use it literally as for regular mappings. The tricky part of this is the fact that we have ...
user avatar
  • 18.4k
6 votes
Accepted

How can I get the list of variables I defined?

If it's a global variable then it resides in g: dictionary, so simply echo g: works. If g: is too big it's possible to search through it, like any other dictionary, for example: echo copy(g:)->...
user avatar
  • 16.9k
5 votes
Accepted

Sort output of let or set

You can capture output with execute() function and then pump it through sort(). The whole command could be then: command! -bang -nargs=1 -complete=command Sorted \ echo join(sort(split(execute(&...
user avatar
  • 16.9k
5 votes

Why is `let foo = $HOME/bar` invalid?

You need to use explicit string concatenation here, since :let wants an expression and the /bar looks like a division by a variable named "bar". What you want here is: let foo = $HOME . '/...
user avatar
  • 26.2k
5 votes
Accepted

Listing global variable

This command will list all global variables: :let g: Using :let by itself will list all variables, and passing it just a prefix (such as g: or b: or v:) will filter the output to only include ...
user avatar
  • 26.2k
5 votes
Accepted

How to unlet a variable in Vim 9 script?

Global variables are still the same as in legacy script, so unlet works as before. The only difference is that the prefix g: now is always required to access global variables. Unletting non-existent ...
user avatar
  • 16.9k
4 votes
Accepted

vim cannot access variable in autocmd

Would be nice to see the full error, on which line it complains. Nevertheless you have error in the script, the set command requires no spaces around =, or spaces at all after = sign. You should also ...
user avatar
  • 4,228
4 votes

Copy the values from a variable?

To put the value of a variable into a buffer use the :put command with the expression register, @=: put=b:aaa You can use a range with :put to put it at a specific location. Put below the 9th line: ...
user avatar
4 votes
Accepted

How to `unlet` a variable using from a `argdo` statement in VIM

When you use a variable without a scope (i instead of b:i or w:i, etc.) outside of a function, you're using a global variable. From :h internal-variables: There are several name spaces for variables. ...
user avatar
  • 23.9k
4 votes
Accepted

As an argument of a function, when does a variable name need to be quoted?

It has to do with the nature of exists(): Note that the argument must be a string, not the name of the variable itself. For example: exists(bufcount) This doesn't check for existence of ...
user avatar
  • 23.9k
4 votes
Accepted

shortcut of the current directory path when vsplit/split

You're looking for %:h/ NB: you can tab-complete at any point after the :h.
user avatar
  • 16.2k
4 votes
Accepted

What is the difference between let mapleader =”,”, and let g:mapleader=”,”

In the .vimrc, there is no difference between them. Without an explicit scope, vim chooses between g: and l: depending on the context. l: is implicit within functions, g: is implicit everywhere else....
user avatar
  • 16.2k
4 votes
Accepted

How do you use variables in a search?

You can include variables in mappings by building the map command as a string and executing it with the :execute command: let s:twoLinesStartingWithWords = '^\w\+.*\n\w\+.*' execute 'nnoremap <...
user avatar
  • 27.9k
4 votes
Accepted

How to use variables?

Most is already in the comments, but to summarize: let indent=4 let &tabstop=indent let &softtabstop=indent let &shiftwidth=indent set expandtab If you want to set a setting (like ...
user avatar
  • 8,635
4 votes

How to delete a line from a variable?

It depends on how you get the result of your external command but you might be interested in :h systemlist(). It executes the command given as parameter and returns a list containing every lines of ...
user avatar
  • 46.5k

Only top scored, non community-wiki answers of a minimum length are eligible