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In vimlanguage, you can set options for the current buffer only using setlocal.
However, I need to set a more complex expression than just a literal, which isn't possible with setlocal.
I currently have let &formatprg=s:prgpath." ".a:args, but this sets the formatprg for all buffers, which is not what I want.
How would I set the formatprg like above, only for the current buffer?
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Use the ":sbuffer" command passing the name of the buffer or the buffer number. Vim will split open a new window and open the specified buffer in that window. You can enter the buffer number you want to jump/edit and press the Ctrl-W ^ or Ctrl-W Ctrl-^ keys. This will open the specified buffer in a new window.
:let on the other hand can do almost everything that :set can do, plus more. It can assign a value to. a variable, e.g. let vi = 'vim' an option, e.g. let &tw = 40. a register, e.g. let @a = $HOME .
Assuming the default backslash leader key, you can also press \bd to close (delete) the buffer in the current window (same as :Bclose ).
Pressing Alt-F12 opens a window listing the buffers, and you can press Enter on a buffer name to go to that buffer. Or, press F12 (next) or Shift-F12 (previous) to cycle through the buffers.
Use let &l:option instead of let &option to only change the local value, like setlocal option. Similarly, let &g:option would only set the global value, like setglobal option. See :help :let-option for more information.
Note that formatprg in particular is global (no "local to buffer" in its help).
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