I would like to have commands like :ce and :ctabe that open a tab with a vertical split with the .c file on one site and the corresponding .h file on the other. How can i accomplish this behaviour?
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1If you search this site for “custom command” there are lots of examples. Then it’s a matter of figuring out the commands to open the appropriate files. As it stands, your question is a little unclear and could use some additional detail to define the problem and what a good solution looks like – D. Ben Knoble♦ Nov 4 '18 at 19:58
Custom commands cannot start with lowercase letters, but you can define for example :Ce and :Ctabe.
Here's a custom function that does the same as :edit {file}:
command! -nargs=1 -complete=file Ce edit <args>
In order to open another related file, you would use :vsplit; the current file can be referenced via the :help cmdline-special notation %. %:r gives you the current file without its file extension. So the following will open the corresponding header file:
command! -nargs=1 -complete=file Ce edit <args> | vsplit %:r.h
PS: There are several plugins that do something like that, too. A very old one is a.vim. A modern one is projectionist.vim.
