" Plugin Manager {{{
	call plug#begin('~/.vim/plugged')
	
	""" Customization
	Plug 'morhetz/gruvbox', {'rtp': 'vim'} " Color theme
	Plug 'itchyny/lightline.vim'           " Statusline and tabline for Vim
	Plug 'ryanoasis/vim-devicons'          " Icons on stuff like NERDTree
	
	""" Quality of life
	Plug 'tomtom/tcomment_vim'    " Toggle comments (gc, gcc)
	Plug 'Raimondi/delimitMate'   " Autocomplete brackets and quotes
	Plug 'preservim/nerdtree'     " Browse directories (:NERDTree)
	Plug 'mbbill/undotree'        " Easily interact with undo history
	Plug 'mg979/vim-visual-multi' " Multiple line cursor (and other stuff)
	Plug 'godlygeek/tabular'      " Line up text by a given character (:Tabularize /CHAR)
	Plug 'tpope/vim-eunuch'       " Easy UNIX shell commands
	Plug 'alvan/vim-closetag'     " Automatically add HTML closing tags
	Plug 'kien/tabman.vim'        " Show open buffers
	Plug 'ervandew/supertab'      " Makes <Tab> be nicer to use with Omnicompletion
	
	""" Software development
	Plug 'dense-analysis/ale'                   " Linting with LSP
	Plug 'honza/vim-snippets'                   " Ready snippets for some languages
	Plug 'editorconfig/editorconfig-vim'        " Support for EditorConfig
	Plug 'zivyangll/git-blame.vim'              " Show who last edited a line
	Plug 'wakatime/vim-wakatime'                " Time tracking via wakatime.com
	
	""" Language integration
	Plug 'dNitro/vim-pug-complete', { 'for': ['jade', 'pug'] } " Pug: Omnicompletion integration
	Plug 'digitaltoad/vim-pug'                                 " Pug: Filetype detection, identation, syntax highlighting
	Plug 'bfrg/vim-cpp-modern'                                 " C/C++: Better syntax highlighting
	
	call plug#end()
" }}}

" General {{{
	" Color scheme {{{
		colorscheme gruvbox
		let g:gruvbox_contrast_dark = 'hard'
		set background=dark " Setting dark mode
	" }}}

	" Character visuals {{{
		set list " Enabled customization of white space characters, so spaces, tabs, EOL, etc. (:h 'list')
		
		" Show tabs as a | with three spaces
		" DO NOT remove the trailing space in the next line!
		set listchars=tab:│\ 
	" }}}

	" Backspace and cursor {{{
		set cul                                     " Highlight current cursor line
		autocmd InsertEnter,InsertLeave * set cul!  " Don't highlight current line, when in insert mode
		set backspace=indent,eol,start              " Better backspace functionality
		
		set number      " Show line numbers to the left
		set scrolloff=0 " Don't keep any screen lines above or below the cursor
		set mouse=a     " Mouse support

		set showmatch " Cursor jumps to matching opening bracket automatically
		
		" Thin cursor in insert mode in Gnome-Terminal (version >=3.16 ; also works with Terminator)
		if has("autocmd")
		  au VimEnter,InsertLeave * silent execute '!echo -ne "\e[1 q"' | redraw!
		  au InsertEnter,InsertChange *
		    \ if v:insertmode == 'i' | 
		    \   silent execute '!echo -ne "\e[5 q"' | redraw! |
		    \ elseif v:insertmode == 'r' |
		    \   silent execute '!echo -ne "\e[3 q"' | redraw! |
		    \ endif
		  au VimLeave * silent execute '!echo -ne "\e[ q"' | redraw!
		endif
	" }}}

	" Indentation {{{
		set tabstop=4    " Show tabs as 4 wide
		set shiftwidth=4 " Indent with 4 spaces
		
		autocmd BufRead,BufNewFile *.component.css set filetype=css
		autocmd FileType css,ts setlocal ts=2 sw=2 sts=0 expandtab " Transform tabs in CSS and TS into 2 spaces
		autocmd FileType lisp,scheme setlocal expandtab
	" }}}

	" Folding {{{
		filetype plugin indent on
		syntax on                                " Syntax highlighting
		autocmd FileType * set foldmethod=syntax " Syntax folding for all
		autocmd FileType vim,text,sh,zsh,xdefaults setlocal foldmethod=marker " Overrides folding to marker for types

		set foldlevel=99 " Open all folds by default
		autocmd FileType vim,sh,zsh,xdefaults setlocal foldlevel=0 " Close all folds by defualt on filetypes

		set foldtext=MyFoldText() " Custom text for a fold
		function MyFoldText()
			let line      = substitute(getline(v:foldstart), "\t", repeat(" ", shiftwidth(0)), "") "  Gets the first fold line and replace tabs with spaces (as many as shiftwidth is set to)
			let linecount = v:foldend - v:foldstart                                                "  Calculates amount of folded lines
			return line . repeat(" ", winwidth('%') - strlen(line) - 10 - strlen(linecount))   
						\ . "  "  . linecount .  "  "                                            "  Shows our line, then a lot of spaces, and at the very end we have line number and arrows
		endfunction
	" }}}

	" Mappings {{{
		" Language mapping for (bulgarian) cyrillic characters to english
		set langmap=АA,аa,БB,бb,ВW,вw,ГG,гg,ДD,дd,ЕE,еe,ЖV,жv,ЗZ,зz,ИI,иi,ЙJ,йj,КK,кk,ЛL,лl,МM,мm,НN,нn,ОO,оo,ПP,пp,РR,рr,СS,сs,ТT,тt,УU,уu,ФF,фf,ХH,хh,ЦC,цc,Ч~,ч`,Ш{,ш[,Щ},щ],ЪY,ъy,ЬX,ьx,Ю\|,ю\\,ЯQ,яq

		" Don't get into insert mode after adding a line with o/O
		nnoremap o o<Esc>
		nnoremap O O<Esc>
		
		" Ctrl-Backspace deletes the previous word in insert mode.
		inoremap <C-h>  <C-w>
		inoremap <C-BS> <C-w>
		
		" Ctrl+s; Ctrl+c, Ctrl+v, Ctrl+x; Ctrl+z, Ctrl+r; Ctrl+a bindings that work on GUI applications
		" Partly taken from: https://gist.github.com/jshih/3423345
		imap <C-s> <ESC>:w<CR>a
		nmap <C-S> <ESC>:w<CR>
		"imap <C-S-z> <C-r> An impossible dream
		vmap <C-c> "+yi<Esc>
		vmap <C-v> c<ESC>"+p<Esc>
		imap <C-v> <ESC>"+pa
		vmap <C-x> "+c<Esc>
		imap <C-z> <ESC>ui
		imap <C-r> <ESC><C-r>i
		map  <C-a> ggVG
		
		" Show all buffers and be able to just type in the number of the buffer
		map <C-f> :set nomore<Bar>:ls<Bar>:set more<CR>:b<Space>
		
		
		" Move a line up and down with Alt+k and Alt-j
		execute "set <M-j>=\ej"
		nnoremap <M-j> <ESC>:m+1<CR>
		execute "set <M-k>=\ek"
		nnoremap <M-k> <ESC>:m-2<CR>
		
		
		" Make session file
		nnoremap <F1> <ESC>:mksession! .vim-session<CR>
		" Show who edited the current line from git history
		nnoremap <F8> :<C-u>call gitblame#echo()<CR>
		" Open lazygit in a new tab with =
		nnoremap = :tab ter ++close lazygit<CR>
	" }}}

	" Command abbreviations {{{
		" Cyrillic (Bulgarian yawerty layout) support
		ca в w
		ca ва wa
		ca ь x
		ca ьа xa
		
		" Make x and xa just save and quit without saving. This allows for closing all tabs and terminals.
		ca x  w <bar> q!
		ca xa wa <bar> qa!
		
		" Open a terminal vim tab with tt and open a blank tab with te
		ca tt tab ter
		ca te tabe
	" }}}

	" Omni completion {{{
		" Omni completion supports C, HTML, CSS, JavaScript, PHP, Python, Ruby, SQL, XML
		set omnifunc=syntaxcomplete#Complete " Completion for all supported languages
		
		" Do omni completion from Ctrl+Space
		inoremap <C-@> <C-X><C-O>
		
		" Thanks to: https://vim.fandom.com/wiki/Make_Vim_completion_popup_menu_work_just_like_in_an_IDE
		" set completeopt=longest,menuone
		" [ The following are disabled, because they conflict with delimitMate's autobracket feature ]
		" inoremap <expr> <CR> pumvisible() ? "\<C-y>" : "\<C-g>u\<CR>"
		" inoremap <expr> <C-n> pumvisible() ? '<C-n>' : '<C-n><C-r>=pumvisible() ? "\<lt>Down>" : ""<CR>'

		" "Disables" arrow navigation in completion menu
		inoremap <expr> <up> pumvisible() ? '<c-y><up>' : '<up>'
		inoremap <expr> <down> pumvisible() ? '<c-y><down>' : '<down>'

		" Pressing tab goes from top to bottom
		let g:SuperTabContextDefaultCompletionType = "<c-n>"
	" }}}

	" Other {{{
		autocmd BufRead,BufNewFile * set tw=0 " Sets textwidth to 0 for all files (set with autocmd since just doing "set tw=0" can be overridden)
		set signcolumn=number                 " Show signs and numbers on the same column
	" }}}
" }}}

" Custom functionality {{{
	" Spell check mode {{{
		" When you press F6 it will toggle a "spell check mode", 
		" spell is activated and the colour scheme is changed
		nmap <F6> :call SpellCheckModeToggle()<CR>
		
		function! SpellCheckModeToggle()
			if g:colors_name == 'gruvbox'
				set spell
				colorscheme darkblue
			else
				set nospell
				colorscheme gruvbox
			endif
		endfunction
		
		" Scrolling (shows history) in terminal (except in lazygit)
		" Scroll up to activate it, and press a to deactivate it
		" Slightly modified version of: https://github.com/vim/vim/issues/2490#issuecomment-393973253
		tmap <silent> <ScrollWheelUp> <c-w>:call EnterNormalMode()<CR>

		function! ExitNormalMode()
			unmap <buffer> <silent> <RightMouse>
			call feedkeys("a")
		endfunction
		
		function! EnterNormalMode()
			if @% == '!lazygit'
				tunmap <silent> <ScrollWheelUp>
			elseif &buftype == 'terminal' && mode('') == 't'
				call feedkeys("\<c-w>N")
				call feedkeys("\<c-y>")
				map <buffer> <silent> <RightMouse> :call ExitNormalMode()<CR>
			endif
		endfunction
	" }}}

	" Code terminal {{{
		" Program in which build actions are executed. If no value, build commands are executes as bash commands.
		" This is only really useful in languages with interpreters
		let g:codeenvs = {
		\	'scheme': 'racket'
		\ }

		" The following two dictionaries support certain substitutions:
		" %F - location of current file (relative path)
		" %D - directory of current file (full path)

		" Building the current file only
		let g:codebuildsingle = {
		\	'scheme': '(enter! "%F")',
		\	'cpp'   : "g++ -g -pedantic '%F' && ./a.out"
		\ }
		" Building all files in the directory (and subdirectories) of the current file
		let g:codebuildproject = {
		\	'cpp' : "g++ -g -pedantic '%D/'**/*.cpp && ./a.out"
		\ }

		noremap <F3> :call CodeTerminal(g:codebuildsingle)<CR>
		noremap <F4> :call CodeTerminal(g:codebuildproject)<CR>
		" We assume that the last accessed window is the one with the source code, otherwise it gets complicated
		tnoremap <F3> <C-W><C-P>:call CodeTerminal(g:codebuildsingle)<CR><C-W><C-P>
		tnoremap <F4> <C-W><C-P>:call CodeTerminal(g:codebuildproject)<CR><C-W><C-P>


		let t:codetermbufnr = -1
		let t:codetermft    = ""
		let t:codetermhadenv = 0
		function! OpenCodeTerminal()
			if !bufexists(t:codetermbufnr)
				term
				" Latest buffer is the terminal buffer we just opened
				let t:codetermbufnr = bufnr("$")
				" We go back to the file from which this was called
				wincmd p
				let t:codetermft = ""
				let t:codetermhadenv = 0
			endif

			if &filetype != t:codetermft
				if t:codetermhadenv
					" This is kinda bad, since certain environments might not close with this only
					call term_sendkeys(t:codetermbufnr, "\<C-D>")
					" The sleep is kinda bad, but it fixes the next term_sendkeys not working properly
					sleep 500m
				endif

				let t:codetermft = &filetype
				if has_key(g:codeenvs, &filetype)
					call term_sendkeys(t:codetermbufnr, g:codeenvs[&filetype] . "\<CR>")
					let t:codetermhadenv = 1
				else
					let t:codetermhadenv = 0
				endif
			endif
		endfunction

		function! CodeTerminal(builddict)
			call OpenCodeTerminal()

			if has_key(a:builddict, &filetype)
				let buildcomm = a:builddict[&filetype] . "\<CR>"
				let buildcomm = substitute(buildcomm, "%F", @%, "")
				let buildcomm = substitute(buildcomm, "%D", expand('%:p:h'), "")
				call term_sendkeys(t:codetermbufnr, buildcomm)
				echo "[CodeTerminal] Sent build command!"
			else
				echo "[CodeTerminal] No value in build dictionary!"
			endif
		endfunction
	" }}}
" }}}

" Plugins {{{
	" DelimitMate {{{
		let delimitMate_expand_cr = 1
		" Don't autocomplete diamond brackets in HTML (compatibility with closetag plugin)
		autocmd FileType html let b:delimitMate_matchpairs='(:),[:],{:}'
	" }}}

	" NERDTree {{{
		" Toggle NERDTree with Tab
		nmap <Tab> :NERDTreeToggle<CR>

		let NERDTreeCustomOpenArgs = {'file':{'where':'t'}} " Open file in new tab, doesn't work only for double-click
		let NERDTreeShowHidden     = 1
		let NERDTreeWinPos         = "right"
		let NERDTreeIgnore         = ['\.swp$', '\~$'] " Ignore file, ending with .swp and ~
	" }}}

	" Undotree {{{
		" Toggle undotree with F5
		nmap <F5> :UndotreeToggle<CR>  
		
		let g:undotree_WindowLayout       = 2
		let g:undotree_ShortIndicators    = 1 " e.g. using 'd' instead of 'days' to save some space.
		let g:undotree_SetFocusWhenToggle = 1 " if set, let undotree window get focus after being opened, otherwise focus will stay in current window.
		let g:undotree_TreeNodeShape      = '*'
		let g:undotree_DiffCommand        = "diff"
	" }}}

	" Tabman {{{
		let g:tabman_toggle = '<S-Tab>'
		let g:tabman_side   = 'right'
	" }}}

	" SuperTab {{{
		let g:SuperTabDefaultCompletionType = "context"
	" }}}

	" Lightline {{{
		" Settings {{{
			set laststatus=2

			if !has('gui_running')
				set t_Co=256
			endif

			let g:lightline = { 
				\ 'enable': { 
				\   'statusline': 1, 
				\   'tabline': 1 
				\ },
				\ 'colorscheme': 'wombat',
				\ 'active': {
				\   'left': [ [ 'mode', 'paste' ],
				\             [ 'gitbranch', 'filename', 'charvaluehex', 'readonly', 'modified' ] ],
				\   'right': [ [ 'lineinfo' ],
				\              [ 'fileencoding', 'filetype'] ]
				\ },
				\ 'component': {
				\   'charvaluehex': '0x%B',
				\ },
				\ 'component_function': {
				\   'gitbranch': 'LightlineFugitive',
				\   'readonly': 'LightlineReadonly',
				\   'modified': 'LightlineModified',
				\   'filetype': 'LightlineFileType'
				\ },
				\ 'tabline': {
				\   'right': [[]]
				\ },
				\ 'tab': {
				\   'active': [ 'iconFilename','iconReadonly', 'iconModified' ],
				\   'inactive': [ 'iconFilename', 'iconReadonly', 'iconModified' ]
				\ },
				\ 'tab_component_function': {
				\   'iconFilename': 'LightlineTabFilename',
				\   'iconReadonly': 'LightlineTabReadonly',
				\   'iconModified': 'LightlineTabModified'
				\ },
				\ 'separator': { 'left': '', 'right': '' },
				\ 'subseparator': { 'left': '', 'right': '' },
				\ 'tabline_separator': { 'left': '', 'right': '' },
				\ 'tabline_subseparator': { 'left': '' }
			\ }
		" }}}

		" Function overrides {{{
			" Most of the following functions are just modification of source: 
			" Examples from doc file - https://github.com/itchyny/lightline.vim/blob/53176a0b75d6389d775d7bce0d494e58fc654f38/doc/lightline.txt#L583
			" Tab source code - https://github.com/itchyny/lightline.vim/blob/master/autoload/lightline/tab.vim

			function! LightlineFugitive()
				if exists('*FugitiveHead')
					let branch = FugitiveHead()
					return branch !=# '' ? ' '.branch : ''
				endif
					return ''
			endfunction

			function! LightlineReadonly()
				return &ft !~? 'help\|vimfiler' && &readonly ? '' : ''
			endfunction

			function! LightlineModified()
				return &ft =~ 'help\|vimfiler' ? '' : &modified ? '' : &modifiable ? '' : ''
			endfunction

			function! LightlineFileType()
				return strlen(&filetype) ? WebDevIconsGetFileTypeSymbol() . ' ' . &filetype : ''
			endfunction

			" Adds the file type icon in tabs and limit their width
			function! LightlineTabFilename(n) abort
				let buflist = tabpagebuflist(a:n)
				let winnr   = tabpagewinnr(a:n)
				let _       = (expand('#'.buflist[winnr - 1].':t') !=# '' ? expand('#'.buflist[winnr - 1].':t') : '[No Name]')

				" Limit the width of tabs, so they don't go out of the screen
				let tabNameLengthMax = &columns/((tabpagenr('$') > 0 ? tabpagenr('$') : 0) + 5)

				return WebDevIconsGetFileTypeSymbol(_) . ' ' . _[0:tabNameLengthMax]
			endfunction

			function! LightlineTabReadonly(n) abort
				let winnr = tabpagewinnr(a:n)
				return gettabwinvar(a:n, winnr, '&readonly') ? '' : ''
			endfunction

			function! LightlineTabModified(n) abort
				let winnr = tabpagewinnr(a:n)
				return gettabwinvar(a:n, winnr, '&modified') ? '' : gettabwinvar(a:n, winnr, '&modifiable') ? '' : ''
			endfunction
		" }}}
	" }}}

	" ALE {{{
		map <F2> <ESC>:ALERename<CR>
		map gd <ESC>:ALEGoToDefinition<CR>
		map gi <ESC>:ALEHover<CR>
		map ge <ESC>:ALEDetail<CR>

		set omnifunc=ale#completion#OmniFunc
		let g:ale_completion_enabled = 1

		let g:ale_floating_preview = 1 " Use floating window
		let g:ale_floating_window_border = ['│', '─', '╭', '╮', '╯', '╰'] " Nicer borders
		
		let g:ale_typescript_tsserver_use_global = 1 " Use global tsserver package
	" }}}
" }}}