[vimrc] Bracket and quote matching and automatic shifting

.vimrc

" How to use: append below code into your ~/.vimrc file 

inoremap ( ()<LEFT> " ( -> ()
inoremap [ []<LEFT> " [ -> []
inoremap { {}<LEFT> " { -> {}

" shift right when input ) and current char is )
function! RemoveNextDoubleChar(char)
    let next_char = getline(".")[col(".")] " get current char
    if a:char == next_char
        execute "normal! l"
    else
        execute "normal! a" . a:char
    end
endfunction
inoremap ) <ESC>:call RemoveNextDoubleChar(')')<CR>a
inoremap ] <ESC>:call RemoveNextDoubleChar(']')<CR>a
inoremap } <ESC>:call RemoveNextDoubleChar('}')<CR>a

" 1. ' -> '', " -> "" and move cursor in the middle of these two char
" 2. shift right when you input ' and currect char is ' 
function! RemoveOrDoubleChar(char)
    let next_char = getline(".")[col(".")] " get current char
    if a:char == next_char
        execute "normal! l"
    else
        let current_line = getline(".")
        let first_char_col_index = match(current_line, '\S')
        if first_char_col_index == -1 || (col(".") != first_char_col_index + 1)
            execute "normal! a" . a:char . a:char . "\<Esc>h"
        else
            execute "normal! i" . a:char . a:char . "\<Esc>h"
        endif
    endif
endfunction
inoremap ' <ESC>:call RemoveOrDoubleChar("'")<CR>a
inoremap " <ESC>:call RemoveOrDoubleChar('"')<CR>a


" all basic vimrc config I used: https://gist.github.com/wa008/f82559aa3354afe16c06ac5527f4612c