" Disable unused components
set nobackup
set nocompatible

" Setup paths
set backupdir=$XDG_CACHE_HOME/vim,/var/tmp,/tmp
set directory=$XDG_CACHE_HOME/vim,/var/tmp,/tmp
set packpath^=$XDG_CONFIG_HOME/vim
set runtimepath^=$XDG_CONFIG_HOME/vim
set viminfo+=n$XDG_CACHE_HOME/vim_history

"" General

filetype plugin on
syntax on

" Behavior
set clipboard=unnamedplus
set encoding=utf-8
set fileencoding=utf-8
set hidden
set history=1000
set mouse=a
set ttimeoutlen=0
set undolevels=1000

set suffixes=.bak,~,.swp,.o,.info,.aux,.log,.dvi,.bbl,.blg,.brf,.cb,.ind,.idx,.ilg,.inx,.out,.toc,.png,.jpg
set wildignore=*.bak,*.swp,*.o,*.info,*.aux,*.log,*.dvi,*.bbl,*.blg,*.brf,*.cb,*.ind,*.idx,*.ilg,*.inx,*.out,*.toc,*.png,*.jpg

" Editing
set number
set ruler

set background=dark
colorscheme hybrid_reverse

set cursorline
highlight clear CursorLine
highlight CursorLineNr cterm=bold

highlight clear SpellBad
highlight SpellBad ctermbg=8 ctermfg=15

" Cursor shape
let &t_SI = "\<Esc>[6 q"
let &t_SR = "\<Esc>[4 q"
let &t_EI = "\<Esc>[2 q"

" Indentation
set autoindent
filetype indent on

set backspace=indent,eol,start
set noexpandtab
set shiftround
set tabstop=4
set softtabstop=4
set shiftwidth=4

" UI
set laststatus=2
set noshowmode
set nowrap
set title

"" Plugin configuration

" lightline.vim
let g:lightline = {}
let g:lightline.colorscheme  = 'Tomorrow_Night_Bright'
let g:lightline.separator    =  {'left': "\ue0b0", 'right': "\ue0b2"}
let g:lightline.subseparator =  {'left': "\ue0b1", 'right': "\ue0b3"}

" lightline-bufferline
let g:lightline.tabline          = {'left': [['buffers']], 'right': [['text']]}
let g:lightline.component_expand = {'buffers': 'lightline#bufferline#buffers'}
let g:lightline.component_type   = {'buffers': 'tabsel'}
let g:lightline.component        = {'text': 'buffers'}

let g:lightline#bufferline#min_buffer_count = 2

" NERD Commenter
let g:NERDCommentEmptyLines=1
let g:NERDSpaceDelims=1
let g:NERDTrimTrailingWhitespace=1

" NERD Tree
let g:NERDTreeIgnore = ['\.git', '\.bak']
let g:NERDTreeAutoDeleteBuffer=1
let g:NERDTreeDirArrowExpandable = ' '
" let g:NERDTreeDirArrowCollapsible = ' '
let g:NERDTreeMinimalUI=1
let g:NERDTreeShowHidden=1

" vimtex
let g:tex_flavor = 'latex'
let g:vimtex_view_method = 'zathura'

"" Autocommands

" Remove trailing whitespace in the following filetypes
augroup TrailingWhitespace
	autocmd! FileType c,cpp,h,ino,java,py,php,sh,tex autocmd BufWritePre <buffer> %s/\s\+$//e
augroup END

" Close vim if only window is NERD Tree
augroup CloseVimTree
	autocmd! bufenter * if (winnr("$") == 1 && exists("b:NERDTree") && b:NERDTree.isTabTree()) | q | endif
augroup END

augroup PreventBuffer
	autocmd FileType nerdtree let t:nerdtree_winnr = bufwinnr('%')
	autocmd BufWinEnter * call PreventBuffersInNERDTree()
augroup END

"" Functions

function! CloseTab()
	let bufNr = bufnr('%')
	let nerdTreeStatus = exists('t:NERDTreeBufName') && bufwinnr(t:NERDTreeBufName) != -1
	let currentFile = expand('%:t')

	if nerdTreeStatus
		execute 'NERDTreeClose'
		if currentFile !~# 'NERD_tree'
			execute 'bw 'bufNr
			execute 'NERDTreeToggle'
		endif
	else
		execute 'bw 'bufNr
	endif
endfunction

function! PreventBuffersInNERDTree()
	if bufname('#') =~ 'NERD_tree' && bufname('%') !~ 'NERD_tree'
				\ && exists('t:nerdtree_winnr') && bufwinnr('%') == t:nerdtree_winnr
				\ && &buftype == ''
		let bufNr = bufnr('%')
		close
		execute 'b 'bufNr
		execute 'NERDTreeToggle'
		execute "normal! \<c-w>\<c-w>"
	endif
endfunction

"" Keybindings

" Change default behavior
nnoremap Y y$
vnoremap p pgvy

" Tab/Shift+Tab functionality
nnoremap <Tab> >>_
nnoremap <S-Tab> <<_
inoremap <S-Tab> <C-D>
vnoremap <Tab> >gv
vnoremap <S-Tab> <gv

" Buffer switching
nnoremap <silent> <C-h> :bprevious<CR>
nnoremap <silent> <C-l> :bnext<CR>
nnoremap <silent> <C-w> :call CloseTab()<CR>
nmap <Leader>1 <Plug>lightline#bufferline#go(1)

" Toggle NERD Tree
nnoremap <silent> <C-t> :NERDTreeToggle<CR>

"" Commands

:command WQ wq
:command Wq wq
:command W w
:command Q q