Special comment snippet for VIM

Question

I want to add comments dependant on the column i'm writing for example if i'm adding a comment over a code which is indented 4 spaces the comment should look like

/* Comment -------------*/

as many dashes as needed to fill up the line till column 100. It should recognize where the position is and how long the comment is.

I can't figure it out with vimscript myself.

Ingo Karkat · Accepted Answer · 2013-10-22 14:22:42Z

4

You can solve this with an expression mapping; see :help :map-expr:

:inoreabbrev <expr> comsep '/* Comment ' . repeat('-', 17 - indent('.')) . '*/'

This determines the width by subtracting the current indent (via indent()) from a constant. You could use &textwidth here, too.

Whenever you type comsep, it'll be expanded. Alternatively, you could also use an :inoremap <expr> <C-g> ... instead.

To insert the comment text, you could either use input(), or first just insert dashes and re-position the cursor by appending a number of "\<Left> keycodes.

If you use a snippet plugin like snipMate or Ultisnips, those may have functionality to dynamically modify the snippet, but the built-in methods should suffice.

edited Oct 22, 2013 at 14:22

answered Oct 22, 2013 at 14:17

Ingo Karkat

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7 Comments

omgodie Over a year ago

ill have a try. in the documentation of snipmate i didn't find something similar to my problem (like repeating n times)

Ingo Karkat Over a year ago

Original snipMate cannot do this dynamically as you type the comment (Ultisnips might). You can use Vimscript expressions in backticks, but these are only evaluated once when expanding the snippet.

omgodie Over a year ago

the command you posted actually doesnt work. it puts just the code into the line after hitting enter.

Ingo Karkat Over a year ago

You need the <expr>; it'll expand after space or enter.

omgodie Over a year ago

yes i meant i actually type "comsep" press enter and then it inserts this: '/* Comment ' . repeat('-', 17 - indent('.')) . '*/'

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