function! WhereAmI(fmt)
    if a:fmt == "gnu"
        let where = expand("%:p") . ":" . line(".")
    elseif a:fmt == "lldb"
        let where = "breakpoint set --file " . expand('%:p') . " --line " . line(".")
    else
        let where = "unknown fmt"
    endif
    let @* = where
    echomsg where
endfunction

nmap <leader>w :call WhereAmI("gnu")<CR>
nmap <leader>W :call WhereAmI("lldb")<CR>