VIM user defined function mapping doesn't work as I expected

Question

I wish when I edit some source file under a directory, press will trigger cmake and make build, like below:

command -bang -nargs=? Umake call Myfunction(<bang>0)
function! Myfunction(forced)
    lcd %:p:h
    call system('cmake && make')
endfunction
nmap <F5> :Umake<cr>

This code snippet is copied from internet and did a bit modification, not very sure if it's totally OK. After re-enter vim, Press , the left-bottom command windows shows ":Su" and nothing happened.

(1) Why nothing happened, any syntax issue in Myfunction? (2) Is the line "command -bang" necessary? What's the meaning of 0 here?

Thanks.

<bang>0 means either !0 which is 1 or 0 which check the presence of a bang (i.e Umake or Umake!) — Meninx - メネンックス
– Meninx - メネンックス, Commented Feb 18, 2017 at 4:40

Luc Hermitte · Accepted Answer · 2017-02-18 10:40:53Z

1

You don't want to compile with system()

Set instead :let &makeprg = 'cd "compilation/dir" && make $*'. Then :make target -j 12.

Again, build-tool-wrappers plugin already handles out-of-source tree compilation (with multiple compilation directories), target detection, background compilation...

answered Feb 18, 2017 at 10:40

Luc Hermitte

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