[vim] Convenient terminal behaviour

Alt+T to toggle a 12-row high split at bottom

editors/vim/vimrc

@@ -549,6 +549,34 @@ nnoremap zS :echo join(reverse(map(synstack(line('.'), col('.')), 'synIDattr(v:v
 " https://github.com/phoenixframework/phoenix/issues/1165#issuecomment-437130681
 let $MIX_ENV='test'
 
+" Terminal Function
+" Courtesy of https://www.reddit.com/r/vim/comments/8n5bzs/using_neovim_is_there_a_way_to_display_a_terminal/dzt3fix
+let g:term_buf = 0
+let g:term_win = 0
+function! TermToggle(height)
+    if win_gotoid(g:term_win)
+        hide
+    else
+        botright new
+        exec "resize " . a:height
+        try
+            exec "buffer " . g:term_buf
+        catch
+            call termopen($SHELL, {"detach": 0})
+            let g:term_buf = bufnr("")
+            set nonumber
+            set norelativenumber
+            set signcolumn=no
+        endtry
+        startinsert!
+        let g:term_win = win_getid()
+    endif
+endfunction
+nnoremap <silent> <leader>te :call TermToggle(12)<CR>
+nnoremap <A-t> :call TermToggle(12)<CR>
+inoremap <A-t> <Esc>:call TermToggle(12)<CR>
+tnoremap <A-t> <C-\><C-n>:call TermToggle(12)<CR>
+
 if filereadable(expand('~/.vimrc.local'))
   source ~/.vimrc.local
 endif