Hi, all

I'm new to vim script language and struggling to code a simple
function to switch between header and source.
Here are the

function! SwitchSourceHeader()
    if (expand ("%:e") == "cpp" || expand ("%:e") == "c" || expand
("%:e") == "cc" )
        find %:t:r.h
    elseif ( expand ("%:e") == "h" )
        let filename = ""
        filename = expand(%:t:r)
        filename = filename + ".cpp"
        if filereadable( filename )
            find %:t:r.cpp
        else
            echo " cannot find source file. "
        endif
    else
        echo "file type unrecognized."
    endif
endfunction
nmap ,s :call SwitchSourceHeader()<CR>

However, I get the following

Error detected while processing function SwitchSourceHeader:
line 5:
E492 Not an editor command: filename = expand(%:t:r)

I am wondering if anyone can point out a correct way for doing this.

best,
-- 
Shuda Li
--------------------------------
PhD  Candidate
Computer Vision Group
Room 1.15
Merchant Venturers Building
Woodland Road
the University of Bristol
Bristol BS8 1UB
United Kingdom
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