Update README.md

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diff --git a/colors/ayu.vim b/colors/ayu.vim
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+" Initialisation:"{{{
+" ----------------------------------------------------------------------------
+hi clear
+if exists("syntax_on")
+  syntax reset
+endif
+let s:style = &background
+let g:colors_name = "ayu"
+"}}}
+
+" Palettes:"{{{
+" ----------------------------------------------------------------------------
+
+let s:palette = {}
+let s:palette.background = { 'dark' : "#0F1419",      'light' : "#FAFAFA" }
+let s:palette.foreground = { 'dark' : "#E6E1CF",      'light' : "#5C6773" }
+let s:palette.line       = { 'dark' : "#151A1F",      'light' : "#d0d0d0" } " Line bg
+let s:palette.line_nr    = { 'dark' : "#2D3640",      'light' : "#D9D8D7" } " Line numbers
+let s:palette.selection  = { 'dark' : "#253340",      'light' : "#F0EEE4" }
+let s:palette.guide      = { 'dark' : "#1A2633",      'light' : "#DEDDDC" }
+
+
+let s:palette.tree       = { 'dark' : "#466280",      'light' : "#5f005f" }
+let s:palette.window     = { 'dark' : "#303030",      'light' : "#9e9e9e" }
+let s:palette.darkcolumn = { 'dark' : "#1c1c1c",      'light' : "#808080" }
+let s:palette.addbg      = { 'dark' : "#5F875F",      'light' : "#d7ffd7" }
+let s:palette.addfg      = { 'dark' : "#d7ffaf",      'light' : "#005f00" }
+let s:palette.changebg   = { 'dark' : "#5F5F87",      'light' : "#d7d7ff" }
+let s:palette.changefg   = { 'dark' : "#d7d7ff",      'light' : "#5f005f" }
+let s:palette.delbg      = { 'dark' : "#cc6666",      'light' : "#ffd7d7" }
+
+let s:palette.string     = { 'dark' : "#B8CC52",      'light' : "#86B300" }
+let s:palette.keyword    = { 'dark' : "#FF7733",      'light' : "#F2590C" }
+let s:palette.comment    = { 'dark' : "#5C6773",      'light' : "#ABB0B6" }
+let s:palette.constant   = { 'dark' : "#FFEE99",      'light' : "#A37ACC" }
+let s:palette.tag        = { 'dark' : "#36A3D9",      'light' : "#41A6D9" }
+let s:palette.es_spec    = { 'dark' : "#E6B673",      'light' : "#CCA37A" }
+let s:palette.orange     = { 'dark' : "#FFAA33",      'light' : "#875f00" }
+
+let s:palette.blue       = { 'dark' : "#2B9FD9",      'light' : "#00005f" }
+let s:palette.gray       = { 'dark' : "#525C66",      'light' : "#5f5f5f" }
+let s:palette.darkred    = { 'dark' : "#5f0000",      'light' : "#d7d7ff" }
+let s:palette.red        = { 'dark' : "#D7503C",      'light' : "#5f0000" }
+let s:palette.yellow     = { 'dark' : "#E7C547",      'light' : "#F29718" }
+let s:palette.darkaqua   = { 'dark' : "#005f5f",      'light' : "#005f00" }
+let s:palette.darkblue   = { 'dark' : "#00005f",      'light' : "#d7ffd7" }
+let s:palette.darkpurple = { 'dark' : "#5f005f",      'light' : "#5f005f" }
+
+"}}}
+
+" Highlighting Primitives:"{{{
+" ----------------------------------------------------------------------------
+
+function! s:build_prim(hi_elem, field)
+  let l:vname = "s:" . a:hi_elem . "_" . a:field " s:bg_gray
+  let l:gui_assign = "gui".a:hi_elem."=".s:palette[a:field][s:style] " guibg=...
+  exe "let " . l:vname . " = ' " . l:gui_assign . "'"
+endfunction
+
+let s:bg_none = ' guibg=NONE ctermbg=NONE'
+let s:fg_none = ' guifg=NONE ctermfg=NONE'
+for [key_name, d_value] in items(s:palette)
+  call s:build_prim('bg', key_name)
+  call s:build_prim('fg', key_name)
+endfor
+" }}}
+
+" Formatting Options:"{{{
+" ----------------------------------------------------------------------------
+let s:none   = "NONE"
+let s:t_none = "NONE"
+let s:n      = "NONE"
+let s:c      = ",undercurl"
+let s:r      = ",reverse"
+let s:s      = ",standout"
+let s:b      = ",bold"
+let s:u      = ",underline"
+let s:i      = ",italic"
+
+exe "let s:fmt_none = ' gui=NONE".          " cterm=NONE".          " term=NONE"        ."'"
+exe "let s:fmt_bold = ' gui=NONE".s:b.      " cterm=NONE".s:b.      " term=NONE".s:b    ."'"
+exe "let s:fmt_bldi = ' gui=NONE".s:b.      " cterm=NONE".s:b.      " term=NONE".s:b    ."'"
+exe "let s:fmt_undr = ' gui=NONE".s:u.      " cterm=NONE".s:u.      " term=NONE".s:u    ."'"
+exe "let s:fmt_undb = ' gui=NONE".s:u.s:b.  " cterm=NONE".s:u.s:b.  " term=NONE".s:u.s:b."'"
+exe "let s:fmt_undi = ' gui=NONE".s:u.      " cterm=NONE".s:u.      " term=NONE".s:u    ."'"
+exe "let s:fmt_curl = ' gui=NONE".s:c.      " cterm=NONE".s:c.      " term=NONE".s:c    ."'"
+exe "let s:fmt_ital = ' gui=NONE".s:i.      " cterm=NONE".s:i.      " term=NONE".s:i    ."'"
+exe "let s:fmt_stnd = ' gui=NONE".s:s.      " cterm=NONE".s:s.      " term=NONE".s:s    ."'"
+exe "let s:fmt_revr = ' gui=NONE".s:r.      " cterm=NONE".s:r.      " term=NONE".s:r    ."'"
+exe "let s:fmt_revb = ' gui=NONE".s:r.s:b.  " cterm=NONE".s:r.s:b.  " term=NONE".s:r.s:b."'"
+"}}}
+
+
+" Vim Highlighting: (see :help highlight-groups)"{{{
+" ----------------------------------------------------------------------------
+exe "hi! Normal"        .s:fg_foreground  .s:bg_background  .s:fmt_none
+exe "hi! ColorColumn"   .s:fg_none        .s:bg_line        .s:fmt_none
+" Conceal, Cursor, CursorIM
+exe "hi! CursorColumn"  .s:fg_none        .s:bg_line        .s:fmt_none
+exe "hi! CursorLine"    .s:fg_none        .s:bg_line        .s:fmt_none
+exe "hi! CursorLineNr"  .s:fg_keyword     .s:bg_line        .s:fmt_none
+exe "hi! LineNr"        .s:fg_line_nr     .s:bg_none        .s:fmt_none
+
+
+exe "hi! Directory"     .s:fg_blue        .s:bg_none        .s:fmt_none
+exe "hi! DiffAdd"       .s:fg_addfg       .s:bg_addbg       .s:fmt_none
+exe "hi! DiffChange"    .s:fg_changefg    .s:bg_changebg    .s:fmt_none
+exe "hi! DiffDelete"    .s:fg_background  .s:bg_delbg       .s:fmt_none
+exe "hi! DiffText"      .s:fg_background  .s:bg_blue        .s:fmt_none
+exe "hi! ErrorMsg"      .s:fg_background  .s:bg_red         .s:fmt_stnd
+exe "hi! VertSplit"     .s:fg_window      .s:bg_none        .s:fmt_none
+exe "hi! Folded"        .s:fg_gray        .s:bg_darkcolumn  .s:fmt_none
+exe "hi! FoldColumn"    .s:fg_none        .s:bg_darkcolumn  .s:fmt_none
+exe "hi! SignColumn"    .s:fg_none        .s:bg_darkcolumn  .s:fmt_none
+"   Incsearch"
+
+exe "hi! MatchParen"    .s:fg_background  .s:bg_changebg    .s:fmt_none
+exe "hi! ModeMsg"       .s:fg_string      .s:bg_none        .s:fmt_none
+exe "hi! MoreMsg"       .s:fg_string      .s:bg_none        .s:fmt_none
+exe "hi! NonText"       .s:fg_background  .s:bg_none        .s:fmt_none
+exe "hi! Pmenu"         .s:fg_foreground  .s:bg_selection   .s:fmt_none
+exe "hi! PmenuSel"      .s:fg_foreground  .s:bg_selection   .s:fmt_revr
+"   PmenuSbar"
+"   PmenuThumb"
+exe "hi! Question"      .s:fg_string      .s:bg_none        .s:fmt_none
+exe "hi! Search"        .s:fg_background  .s:bg_yellow      .s:fmt_none
+exe "hi! SpecialKey"    .s:fg_selection   .s:bg_none        .s:fmt_none
+exe "hi! SpellCap"      .s:fg_blue        .s:bg_darkblue    .s:fmt_undr
+exe "hi! SpellLocal"    .s:fg_es_spec     .s:bg_darkaqua    .s:fmt_undr
+exe "hi! SpellBad"      .s:fg_red         .s:bg_darkred     .s:fmt_undr
+exe "hi! SpellRare"     .s:fg_tag         .s:bg_darkpurple  .s:fmt_undr
+exe "hi! StatusLine"    .s:fg_gray        .s:bg_background  .s:fmt_revr
+exe "hi! StatusLineNC"  .s:fg_window      .s:bg_gray        .s:fmt_revr
+exe "hi! TabLine"       .s:fg_foreground  .s:bg_darkcolumn  .s:fmt_revr
+"   TabLineFill"
+"   TabLineSel"
+exe "hi! Title"         .s:fg_keyword     .s:bg_none        .s:fmt_none
+exe "hi! Visual"        .s:fg_none        .s:bg_selection   .s:fmt_none
+"   VisualNos"
+exe "hi! WarningMsg"    .s:fg_red         .s:bg_none        .s:fmt_none
+" FIXME LongLineWarning to use variables instead of hardcoding
+hi LongLineWarning  guifg=NONE        guibg=#371F1C     gui=underline ctermfg=NONE        ctermbg=NONE        cterm=underline
+"   WildMenu"
+
+"}}}
+" Generic Syntax Highlighting: (see :help group-name)"{{{
+" ----------------------------------------------------------------------------
+exe "hi! Comment"         .s:fg_comment   .s:bg_none        .s:fmt_none
+
+exe "hi! Constant"        .s:fg_constant  .s:bg_none        .s:fmt_none
+exe "hi! String"          .s:fg_string    .s:bg_none        .s:fmt_none
+"   Character"
+"   Number"
+"   Boolean"
+"   Float"
+
+exe "hi! Identifier"      .s:fg_tag       .s:bg_none        .s:fmt_none
+exe "hi! Function"        .s:fg_keyword   .s:bg_none        .s:fmt_none
+
+exe "hi! Statement"       .s:fg_keyword   .s:bg_none        .s:fmt_none
+"   Conditional"
+"   Repeat"
+"   Label"
+exe "hi! Operator"        .s:fg_es_spec   .s:bg_none        .s:fmt_none
+"   Keyword"
+"   Exception"
+
+exe "hi! PreProc"         .s:fg_es_spec   .s:bg_none        .s:fmt_none
+"   Include"
+"   Define"
+"   Macro"
+"   PreCondit"
+
+exe "hi! Type"            .s:fg_tag       .s:bg_none        .s:fmt_none
+"   StorageClass"
+exe "hi! Structure"       .s:fg_es_spec   .s:bg_none        .s:fmt_none
+"   Typedef"
+
+exe "hi! Special"         .s:fg_tag       .s:bg_none        .s:fmt_none
+"   SpecialChar"
+"   Tag"
+"   Delimiter"
+"   SpecialComment"
+"   Debug"
+"
+exe "hi! Underlined"      .s:fg_blue      .s:bg_none        .s:fmt_none
+
+exe "hi! Ignore"          .s:fg_none      .s:bg_none        .s:fmt_none
+
+exe "hi! Error"           .s:fg_red       .s:bg_darkred     .s:fmt_undr
+
+exe "hi! Todo"            .s:fg_addfg     .s:bg_none        .s:fmt_none
+
+" Quickfix window highlighting
+exe "hi! qfLineNr"        .s:fg_keyword   .s:bg_none        .s:fmt_none
+"   qfFileName"
+"   qfLineNr"
+"   qfError"
+
+exe "hi! Conceal"         .s:fg_guide     .s:bg_none        .s:fmt_none
+exe "hi! CursorLineConceal" .s:fg_guide   .s:bg_line        .s:fmt_none
+
+
+
+
+
+
+
+" NerdTree
+" " --------
+"
+exe "hi! NERDTreeOpenable"          .s:fg_tree        .s:bg_none        .s:fmt_none
+exe "hi! NERDTreeClosable"          .s:fg_orange      .s:bg_none        .s:fmt_none
+" exe "hi! NERDTreeBookmarksHeader"   .s:fg_pink        .s:bg_none        .s:fmt_none
+" exe "hi! NERDTreeBookmarksLeader"   .s:fg_background  .s:bg_none        .s:fmt_none
+" exe "hi! NERDTreeBookmarkName"      .s:fg_keyword     .s:bg_none        .s:fmt_none
+" exe "hi! NERDTreeCWD"               .s:fg_pink        .s:bg_none        .s:fmt_none
+exe "hi! NERDTreeUp"                .s:fg_tree       .s:bg_none        .s:fmt_none
+exe "hi! NERDTreeDirSlash"          .s:fg_foreground .s:bg_none        .s:fmt_none
+exe "hi! NERDTreeDir"               .s:fg_tree       .s:bg_none        .s:fmt_none
+exe "hi! NERDTreeFile"              .s:fg_tree       .s:bg_none        .s:fmt_none
+"}}}
+" Diff Syntax Highlighting:"{{{
+" ----------------------------------------------------------------------------
+" Diff
+"   diffOldFile
+"   diffNewFile
+"   diffFile
+"   diffOnly
+"   diffIdentical
+"   diffDiffer
+"   diffBDiffer
+"   diffIsA
+"   diffNoEOL
+"   diffCommon
+hi! link diffRemoved Constant
+"   diffChanged
+hi! link diffAdded Special
+"   diffLine
+"   diffSubname
+"   diffComment
+
+"}}}
+"
+" This is needed for some reason: {{{
+
+let &background = s:style
+
+" }}}