switch between folders (i.e between view and controller in a MVC app)

switch between folders

" Example
" app/view/User.js
" switch to app/controller/User.js

function! SwitchBetween(from, to)
    " TODO check if file exists
    let firstPath = RemoveWDFromPath(expand('%:p'))
    if match(firstPath, '\/'.a:from.'\/') != -1
        let first = a:from
        let sec = a:to
    elseif match(firstPath, '\/'.a:to.'\/') != -1
        let first = a:to
        let sec = a:from
    else
        return
    endif
    let secPath = substitute(firstPath, '\/'.first.'\/',  '\/'.sec.'\/', 'g')
    echo secPath
    execute "edit" secPath
endfunction

function! RemoveWDFromPath(path)
    let cwd = substitute(getcwd(), '\/Users\/.*\/', '', '')
    let cwd = substitute(getcwd(), '~\/', '', '')
    return substitute(a:path, '.*' .cwd . '\/', '', '')
endfunction
nnoremap <Leader>vc :call SwitchBetween('view', 'controller')<cr>