VIM script to toggle `"RAW"` mode.

rawmode.vim

function! ToggleRawMode()                                                                                                                                                    
    let notraw = ((&signcolumn != 'no') || &number || &conceallevel)                                                                                                         
    if notraw                                                                                                                                                                
        let b:signcolumn_saved=&signcolumn                                                                                                                                   
        set signcolumn=no                                                                                                                                                    
        let b:conceallevel_saved=&conceallevel                                                                                                                               
        set conceallevel=0                                                                                                                                                   
        set nonumber                                                                                                                                                         
    else                                                                                                                                                                     
        if empty(b:signcolumn_saved)                                                                                                                                         
            set signcolumn=yes                                                                                                                                               
        else                                                                                                                                                                 
            let &signcolumn=b:signcolumn_saved                                                                                                                               
        endif                                                                                                                                                                
        if empty(b:conceallevel_saved)                                                                                                                                       
            set conceallevel=0                                                                                                                                               
        else                                                                                                                                                                 
            let &conceallevel=b:conceallevel_saved                                                                                                                           
        endif                                                                                                                                                                
        set number                                                                                                                                                           
    endif                                                                                                                                                                    
endfunction