VIM: Window and Tab binds

if has('gui_running') " gVim
    " Remove the toolbar.
    set guioptions-=T

    " Remove the menu toolbar.
    set guioptions-=m

    " Remove left-hand scrollbar.
    set guioptions-=l
    set guioptions-=L

    " Remove right-hand scrollbar.
    set guioptions-=r
    set guioptions-=R

    " Disable autoselect which forces MiddleMouse clicks in other programs to paste the contents of Vim's "+ unnamedplus register instead of the "* unnamed selection register. See :h go-a
    set guioptions-=a
    set guioptions-=A

    " Tab navigation
    " SOURCE: http://genotrance.wordpress.com/2008/02/04/my-vim-customization/
    " SOURCE: https://github.com/bashwork/settings/blob/master/linux/.vimrc

    " New Tab.
    noremap <C-t> :tabnew<CR>
    inoremap <C-t> <Esc>:tabnew<CR>i
    cnoremap <C-t> <Esc><Esc>:tabnew<CR>

    " Close Tab.
    "noremap <C-w> :tabclose<CR> " Firefox uses this but had to disable it because it interferes with ctrl + ww to switch between windows
    noremap <C-q> :tabclose<CR>
    inoremap <C-q> <Esc>:tabclose<CR>
    cnoremap <C-q> <Esc><Esc>:tabclose<CR>

    " Next Tab.
    noremap <C-Tab> :tabnext<CR>
    inoremap <C-Tab> <Esc>:tabnext<CR>i
    cnoremap <C-Tab> <Esc><Esc>:tabnext<CR>

    " Previous Tab.
    noremap <C-S-Tab> :tabprevious<CR>
    inoremap <C-S-Tab> <Esc>:tabprevious<CR>i
    cnoremap <C-S-Tab> <Esc><Esc>:tabprevious<CR>

    " Hold shift for horizontal mouse-wheel scrolling.
    " NOTE: This works for Linux and macOS but [:h scroll-mouse-wheel] says this does not work with Windows).
    " SOURCE: https://github.com/graywh/dotfiles/blob/master/.gvimrc
    noremap <S-ScrollWheelUp> <ScrollWheelLeft>
    inoremap <S-ScrollWheelUp> <ScrollWheelLeft>
    cnoremap <S-ScrollWheelUp> <ScrollWheelLeft>

    noremap <S-ScrollWheelDown> <ScrollWheelRight>
    inoremap <S-ScrollWheelDown> <ScrollWheelRight>
    cnoremap <S-ScrollWheelDown> <ScrollWheelRight>

    " Different cursors for different modes.
    "
    "     Default value of guicursor:
    "     set guicursor=
    "     set guicursor+=n-v-c:block-Cursor/lCursor,
    "     set guicursor+=ve:ver35-Cursor,
    "     set guicursor+=o:hor50-Cursor,
    "     set guicursor+=i-ci:ver25-Cursor/lCursor,
    "     set guicursor+=r-cr:hor20-Cursor/lCursor,
    "     set guicursor+=sm:block-Cursor-blinkwait175-blinkoff150-blinkon175
    "
    " Moved v (Visual) to ve (Visual mode with 'selection') and applied a non-blinking block cursor.
    " Made r (Replace) and cr (Command-line Replace) a blinking block cursor.
    set guicursor=
    set guicursor+=n-c:block-Cursor/lCursor,
    set guicursor+=v-ve:block-Cursor-blinkon0,
    set guicursor+=o:hor50-Cursor,
    set guicursor+=i-ci:ver25-Cursor/lCursor,
    " set guicursor+=r-cr:block-Cursor/lCursor,
    set guicursor+=r-cr:hor20-Cursor/lCursor,
    set guicursor+=sm:block-Cursor-blinkwait175-blinkoff150-blinkon175
endif

" Bind Leader + Up/Down/Left/Right for window moving {{{

nnoremap <silent> <Leader><left> <C-w>H
nnoremap <silent> <Leader><right> <C-w>L
nnoremap <silent> <Leader><up> <C-w>K
nnoremap <silent> <Leader><down> <C-w>J

" }}} Bind Leader + Up/Down/Left/Right for window moving
" Bind Ctrl + Up/Down/Left/Right for window creation {{{

" Window creation.
" SOURCE: https://stackoverflow.com/questions/22614280/vim-open-file-in-right-split
" SOURCE: https://technotales.wordpress.com/2010/04/29/vim-splits-a-guide-to-doing-exactly-what-you-want/
"nnoremap <silent> <C-left>   :leftabove  vnew<CR>:startinsert<CR>
"nnoremap <silent> <C-right>  :rightbelow vnew<CR>:startinsert<CR>
"nnoremap <silent> <C-up>     :leftabove  new<CR>:startinsert<CR>
"nnoremap <silent> <C-down>   :rightbelow new<CR>:startinsert<CR>

" Open Startify in the created window.
nnoremap <silent> <C-left>    :leftabove  vnew<CR>:Startify<CR>
nnoremap <silent> <C-right>   :rightbelow vnew<CR>:Startify<CR>
nnoremap <silent> <C-up>      :leftabove  new<CR>:Startify<CR>
nnoremap <silent> <C-down>    :rightbelow new<CR>:Startify<CR>

" }}} Bind Ctrl + Up/Down/Left/Right for window creation
" Bind Alt + Up/Down/Left/Right for window viewing {{{

" Built in ways to navigate windows:
"   Cycle all windows: <Ctrl + W><Ctrl + W>
"   Window navigating: <Ctrl + W><arrow key>

"nnoremap <A-left> <C-w>h
"nnoremap <A-right> <C-w>l
"nnoremap <A-up> <C-w>k
"nnoremap <A-down> <C-w>j

" SOURCE[modded]: http://janneinosaka.blogspot.com/2014/10/automatically-resize-vim-splits.html
function! SplitResize()
    let ratio = 0.9 "2.0/3.0

    if &ft ==? 'help'
        let hmax = 83
    elseif &ft ==? 'nerdtree'
        let hmax = 40
    else
        let hmax = max([winwidth(0), float2nr(&columns * ratio)])
    endif

    let vmax = max([winheight(0), float2nr(&lines * ratio)])
    exe "vertical resize" . hmax
    exe "resize" . vmax
endfunction

" NOTE: Use <Control-W>= to equalize windows size. See :h CTRL-W_=
" CTRL-W =    Make all windows (almost) equally high and wide, but use
"             'winheight' and 'winwidth' for the current window.
"             Windows with 'winfixheight' set keep their height and windows
"             with 'winfixwidth' set keep their width.
"
" Alt + = makes more sense.
nnoremap <silent> <A-=> <C-w>=

" Window navigation.
nnoremap <silent> <A-left>  <C-w>h:call SplitResize()<CR>
nnoremap <silent> <A-right> <C-w>l:call SplitResize()<CR>
nnoremap <silent> <A-up>    <C-w>k:call SplitResize()<CR>
nnoremap <silent> <A-down>  <C-w>j:call SplitResize()<CR>

" }}} Bind Alt + Up/Down/Left/Right for window viewing