vim-patch:8.1.1693: syntax coloring and highlighting is in one big file (#17721)

Problem:    Syntax coloring and highlighting is in one big file.
Solution:   Move the highlighting to a separate file. (Yegappan Lakshmanan,
            closes vim/vim#4674)

https://github.com/vim/vim/commit/f9cc9f209ede9f15959e4c2351e970477c139614

Name the new file highlight_group.c instead.

Co-authored-by: zeertzjq <zeertzjq@outlook.com>

29 files changed, 2870 insertions, 2841 deletions

diff --git a/src/nvim/api/extmark.c b/src/nvim/api/extmark.c
index e355f82f4d..c02688a815 100644
--- a/src/nvim/api/extmark.c
+++ b/src/nvim/api/extmark.c
@@ -10,10 +10,10 @@
 #include "nvim/api/private/helpers.h"
 #include "nvim/decoration_provider.h"
 #include "nvim/extmark.h"
+#include "nvim/highlight_group.h"
 #include "nvim/lua/executor.h"
 #include "nvim/memline.h"
 #include "nvim/screen.h"
-#include "nvim/syntax.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "api/extmark.c.generated.h"
@@ -856,7 +856,7 @@ Integer nvim_buf_add_highlight(Buffer buffer, Integer ns_id, String hl_group, In
 
   int hl_id = 0;
   if (hl_group.size > 0) {
-    hl_id = syn_check_group(hl_group.data, (int)hl_group.size);
+    hl_id = syn_check_group(hl_group.data, hl_group.size);
   } else {
     return ns_id;
   }
diff --git a/src/nvim/api/private/helpers.c b/src/nvim/api/private/helpers.c
index 9f41393c6b..88954a1aa2 100644
--- a/src/nvim/api/private/helpers.c
+++ b/src/nvim/api/private/helpers.c
@@ -22,6 +22,7 @@
 #include "nvim/extmark.h"
 #include "nvim/fileio.h"
 #include "nvim/getchar.h"
+#include "nvim/highlight_group.h"
 #include "nvim/lib/kvec.h"
 #include "nvim/lua/executor.h"
 #include "nvim/map.h"
@@ -32,7 +33,6 @@
 #include "nvim/msgpack_rpc/helpers.h"
 #include "nvim/option.h"
 #include "nvim/option_defs.h"
-#include "nvim/syntax.h"
 #include "nvim/ui.h"
 #include "nvim/version.h"
 #include "nvim/vim.h"
@@ -1293,7 +1293,7 @@ int object_to_hl_id(Object obj, const char *what, Error *err)
 {
   if (obj.type == kObjectTypeString) {
     String str = obj.data.string;
-    return str.size ? syn_check_group(str.data, (int)str.size) : 0;
+    return str.size ? syn_check_group(str.data, str.size) : 0;
   } else if (obj.type == kObjectTypeInteger) {
     return MAX((int)obj.data.integer, 0);
   } else {
@@ -1327,7 +1327,7 @@ HlMessage parse_hl_msg(Array chunks, Error *err)
       String hl = chunk.items[1].data.string;
       if (hl.size > 0) {
         // TODO(bfredl): use object_to_hl_id and allow integer
-        int hl_id = syn_check_group(hl.data, (int)hl.size);
+        int hl_id = syn_check_group(hl.data, hl.size);
         attr = hl_id > 0 ? syn_id2attr(hl_id) : 0;
       }
     }
diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index d1ca7662f6..bdeac1a9f4 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -35,6 +35,7 @@
 #include "nvim/globals.h"
 #include "nvim/highlight.h"
 #include "nvim/highlight_defs.h"
+#include "nvim/highlight_group.h"
 #include "nvim/lua/executor.h"
 #include "nvim/mark.h"
 #include "nvim/memline.h"
@@ -50,7 +51,6 @@
 #include "nvim/popupmnu.h"
 #include "nvim/screen.h"
 #include "nvim/state.h"
-#include "nvim/syntax.h"
 #include "nvim/types.h"
 #include "nvim/ui.h"
 #include "nvim/vim.h"
@@ -112,7 +112,7 @@ Dictionary nvim_get_hl_by_id(Integer hl_id, Boolean rgb, Error *err)
 Integer nvim_get_hl_id_by_name(String name)
   FUNC_API_SINCE(7)
 {
-  return syn_check_group(name.data, (int)name.size);
+  return syn_check_group(name.data, name.size);
 }
 
 Dictionary nvim__get_hl_defs(Integer ns_id, Error *err)
@@ -147,7 +147,7 @@ Dictionary nvim__get_hl_defs(Integer ns_id, Error *err)
 void nvim_set_hl(Integer ns_id, String name, Dict(highlight) *val, Error *err)
   FUNC_API_SINCE(7)
 {
-  int hl_id = syn_check_group(name.data, (int)name.size);
+  int hl_id = syn_check_group(name.data, name.size);
   int link_id = -1;
 
   HlAttrs attrs = dict2hlattrs(val, true, &link_id, err);
diff --git a/src/nvim/api/win_config.c b/src/nvim/api/win_config.c
index d8ccd67bcd..b0267f5ed0 100644
--- a/src/nvim/api/win_config.c
+++ b/src/nvim/api/win_config.c
@@ -10,6 +10,7 @@
 #include "nvim/api/private/helpers.h"
 #include "nvim/api/win_config.h"
 #include "nvim/ascii.h"
+#include "nvim/highlight_group.h"
 #include "nvim/option.h"
 #include "nvim/screen.h"
 #include "nvim/strings.h"
diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index bfaee82311..dbb471a532 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -51,6 +51,7 @@
 #include "nvim/getchar.h"
 #include "nvim/hashtab.h"
 #include "nvim/highlight.h"
+#include "nvim/highlight_group.h"
 #include "nvim/indent.h"
 #include "nvim/indent_c.h"
 #include "nvim/main.h"
diff --git a/src/nvim/cursor_shape.c b/src/nvim/cursor_shape.c
index cb8c8cddf6..0e4a4bcfb0 100644
--- a/src/nvim/cursor_shape.c
+++ b/src/nvim/cursor_shape.c
@@ -9,8 +9,8 @@
 #include "nvim/charset.h"
 #include "nvim/cursor_shape.h"
 #include "nvim/ex_getln.h"
+#include "nvim/highlight_group.h"
 #include "nvim/strings.h"
-#include "nvim/syntax.h"
 #include "nvim/ui.h"
 #include "nvim/vim.h"
 
@@ -226,11 +226,11 @@ char *parse_shape_opt(int what)
               slashp = vim_strchr(p, '/');
               if (slashp != NULL && slashp < endp) {
                 // "group/langmap_group"
-                i = syn_check_group((char *)p, (int)(slashp - p));
+                i = syn_check_group((char *)p, (size_t)(slashp - p));
                 p = slashp + 1;
               }
               if (round == 2) {
-                shape_table[idx].id = syn_check_group((char *)p, (int)(endp - p));
+                shape_table[idx].id = syn_check_group((char *)p, (size_t)(endp - p));
                 shape_table[idx].id_lm = shape_table[idx].id;
                 if (slashp != NULL && slashp < endp) {
                   shape_table[idx].id = i;
diff --git a/src/nvim/decoration.c b/src/nvim/decoration.c
index 94bf1feeee..fb709d12ff 100644
--- a/src/nvim/decoration.c
+++ b/src/nvim/decoration.c
@@ -5,10 +5,10 @@
 #include "nvim/decoration.h"
 #include "nvim/extmark.h"
 #include "nvim/highlight.h"
+#include "nvim/highlight_group.h"
 #include "nvim/lua/executor.h"
 #include "nvim/move.h"
 #include "nvim/screen.h"
-#include "nvim/syntax.h"
 #include "nvim/vim.h"
 
 #ifdef INCLUDE_GENERATED_DECLARATIONS
diff --git a/src/nvim/edit.c b/src/nvim/edit.c
index 2e36962a4d..c087948810 100644
--- a/src/nvim/edit.c
+++ b/src/nvim/edit.c
@@ -26,6 +26,7 @@
 #include "nvim/fileio.h"
 #include "nvim/fold.h"
 #include "nvim/getchar.h"
+#include "nvim/highlight_group.h"
 #include "nvim/indent.h"
 #include "nvim/indent_c.h"
 #include "nvim/keymap.h"
diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index f4ce6e3b39..af7c3d4985 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -33,6 +33,7 @@
 #include "nvim/ex_session.h"
 #include "nvim/fileio.h"
 #include "nvim/getchar.h"
+#include "nvim/highlight_group.h"
 #include "nvim/lua/executor.h"
 #include "nvim/mark.h"
 #include "nvim/memline.h"
diff --git a/src/nvim/eval/funcs.c b/src/nvim/eval/funcs.c
index 9579a996bc..6e98f229b2 100644
--- a/src/nvim/eval/funcs.c
+++ b/src/nvim/eval/funcs.c
@@ -31,6 +31,7 @@
 #include "nvim/fileio.h"
 #include "nvim/fold.h"
 #include "nvim/globals.h"
+#include "nvim/highlight_group.h"
 #include "nvim/if_cscope.h"
 #include "nvim/indent.h"
 #include "nvim/indent_c.h"
diff --git a/src/nvim/ex_cmds.c b/src/nvim/ex_cmds.c
index 1b2a9579e4..ff803c3553 100644
--- a/src/nvim/ex_cmds.c
+++ b/src/nvim/ex_cmds.c
@@ -38,6 +38,7 @@
 #include "nvim/garray.h"
 #include "nvim/getchar.h"
 #include "nvim/highlight.h"
+#include "nvim/highlight_group.h"
 #include "nvim/indent.h"
 #include "nvim/input.h"
 #include "nvim/log.h"
diff --git a/src/nvim/ex_docmd.c b/src/nvim/ex_docmd.c
index 14d0c58cd1..c6089562f3 100644
--- a/src/nvim/ex_docmd.c
+++ b/src/nvim/ex_docmd.c
@@ -38,6 +38,7 @@
 #include "nvim/getchar.h"
 #include "nvim/globals.h"
 #include "nvim/hardcopy.h"
+#include "nvim/highlight_group.h"
 #include "nvim/if_cscope.h"
 #include "nvim/input.h"
 #include "nvim/keymap.h"
diff --git a/src/nvim/ex_getln.c b/src/nvim/ex_getln.c
index c7a6309958..84fca137d2 100644
--- a/src/nvim/ex_getln.c
+++ b/src/nvim/ex_getln.c
@@ -35,6 +35,7 @@
 #include "nvim/getchar.h"
 #include "nvim/highlight.h"
 #include "nvim/highlight_defs.h"
+#include "nvim/highlight_group.h"
 #include "nvim/if_cscope.h"
 #include "nvim/indent.h"
 #include "nvim/keymap.h"
diff --git a/src/nvim/globals.h b/src/nvim/globals.h
index cbd67afb09..605a2183f3 100644
--- a/src/nvim/globals.h
+++ b/src/nvim/globals.h
@@ -361,6 +361,11 @@ EXTERN int provider_call_nesting INIT(= 0);
 
 EXTERN int t_colors INIT(= 256);                // int value of T_CCO
 
+// Flags to indicate an additional string for highlight name completion.
+EXTERN int include_none INIT(= 0);     // when 1 include "None"
+EXTERN int include_default INIT(= 0);  // when 1 include "default"
+EXTERN int include_link INIT(= 0);     // when 2 include "link" and "clear"
+
 // When highlight_match is true, highlight a match, starting at the cursor
 // position.  Search_match_lines is the number of lines after the match (0 for
 // a match within one line), search_match_endcol the column number of the
diff --git a/src/nvim/hardcopy.c b/src/nvim/hardcopy.c
index 93c8c53e33..575b239f5a 100644
--- a/src/nvim/hardcopy.c
+++ b/src/nvim/hardcopy.c
@@ -22,6 +22,7 @@
 #include "nvim/fileio.h"
 #include "nvim/garray.h"
 #include "nvim/hardcopy.h"
+#include "nvim/highlight_group.h"
 #include "nvim/mbyte.h"
 #include "nvim/memline.h"
 #include "nvim/memory.h"
diff --git a/src/nvim/highlight.c b/src/nvim/highlight.c
index abbda1e9fa..7d91f38d56 100644
--- a/src/nvim/highlight.c
+++ b/src/nvim/highlight.c
@@ -8,13 +8,13 @@
 #include "nvim/decoration_provider.h"
 #include "nvim/highlight.h"
 #include "nvim/highlight_defs.h"
+#include "nvim/highlight_group.h"
 #include "nvim/lua/executor.h"
 #include "nvim/map.h"
 #include "nvim/message.h"
 #include "nvim/option.h"
 #include "nvim/popupmnu.h"
 #include "nvim/screen.h"
-#include "nvim/syntax.h"
 #include "nvim/ui.h"
 #include "nvim/vim.h"
 
diff --git a/src/nvim/highlight_group.c b/src/nvim/highlight_group.c
new file mode 100644
index 0000000000..f342ada3db
--- /dev/null
+++ b/src/nvim/highlight_group.c
@@ -0,0 +1,2799 @@
+// This is an open source non-commercial project. Dear PVS-Studio, please check
+// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+
+// highlight_group.c: code for managing highlight groups
+
+#include "nvim/autocmd.h"
+#include "nvim/api/private/helpers.h"
+#include "nvim/charset.h"
+#include "nvim/cursor_shape.h"
+#include "nvim/ex_docmd.h"
+#include "nvim/garray.h"
+#include "nvim/highlight.h"
+#include "nvim/highlight_group.h"
+#include "nvim/lua/executor.h"
+#include "nvim/map.h"
+#include "nvim/option.h"
+#include "nvim/runtime.h"
+#include "nvim/screen.h"
+
+/// \addtogroup SG_SET
+/// @{
+#define SG_CTERM        2       // cterm has been set
+#define SG_GUI          4       // gui has been set
+#define SG_LINK         8       // link has been set
+/// @}
+
+#define MAX_SYN_NAME 200
+
+// builtin |highlight-groups|
+static garray_T highlight_ga = GA_EMPTY_INIT_VALUE;
+
+Map(cstr_t, int) highlight_unames = MAP_INIT;
+
+/// The "term", "cterm" and "gui" arguments can be any combination of the
+/// following names, separated by commas (but no spaces!).
+static char *(hl_name_table[]) =
+  { "bold", "standout", "underline", "underlineline", "undercurl", "underdot",
+    "underdash", "italic", "reverse", "inverse", "strikethrough", "nocombine", "NONE" };
+static int hl_attr_table[] =
+  { HL_BOLD, HL_STANDOUT, HL_UNDERLINE, HL_UNDERLINELINE, HL_UNDERCURL, HL_UNDERDOT, HL_UNDERDASH,
+    HL_ITALIC, HL_INVERSE, HL_INVERSE, HL_STRIKETHROUGH, HL_NOCOMBINE, 0 };
+
+/// Structure that stores information about a highlight group.
+/// The ID of a highlight group is also called group ID.  It is the index in
+/// the highlight_ga array PLUS ONE.
+typedef struct {
+  char_u *sg_name;         ///< highlight group name
+  char *sg_name_u;       ///< uppercase of sg_name
+  bool sg_cleared;              ///< "hi clear" was used
+  int sg_attr;                  ///< Screen attr @see ATTR_ENTRY
+  int sg_link;                  ///< link to this highlight group ID
+  int sg_deflink;               ///< default link; restored in highlight_clear()
+  int sg_set;                   ///< combination of flags in \ref SG_SET
+  sctx_T sg_deflink_sctx;       ///< script where the default link was set
+  sctx_T sg_script_ctx;         ///< script in which the group was last set
+  // for terminal UIs
+  int sg_cterm;                 ///< "cterm=" highlighting attr
+                                ///< (combination of \ref HlAttrFlags)
+  int sg_cterm_fg;              ///< terminal fg color number + 1
+  int sg_cterm_bg;              ///< terminal bg color number + 1
+  bool sg_cterm_bold;           ///< bold attr was set for light color
+  // for RGB UIs
+  int sg_gui;                   ///< "gui=" highlighting attributes
+                                ///< (combination of \ref HlAttrFlags)
+  RgbValue sg_rgb_fg;           ///< RGB foreground color
+  RgbValue sg_rgb_bg;           ///< RGB background color
+  RgbValue sg_rgb_sp;           ///< RGB special color
+  char *sg_rgb_fg_name;         ///< RGB foreground color name
+  char *sg_rgb_bg_name;         ///< RGB background color name
+  char *sg_rgb_sp_name;         ///< RGB special color name
+
+  int sg_blend;                 ///< blend level (0-100 inclusive), -1 if unset
+} HlGroup;
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "highlight_group.c.generated.h"
+#endif
+
+static inline HlGroup *HL_TABLE(void)
+{
+  return ((HlGroup *)((highlight_ga.ga_data)));
+}
+
+// The default highlight groups.  These are compiled-in for fast startup and
+// they still work when the runtime files can't be found.
+//
+// When making changes here, also change runtime/colors/default.vim!
+
+static const char *highlight_init_both[] = {
+  "Conceal      ctermbg=DarkGrey ctermfg=LightGrey guibg=DarkGrey guifg=LightGrey",
+  "Cursor       guibg=fg guifg=bg",
+  "lCursor      guibg=fg guifg=bg",
+  "DiffText     cterm=bold ctermbg=Red gui=bold guibg=Red",
+  "ErrorMsg     ctermbg=DarkRed ctermfg=White guibg=Red guifg=White",
+  "IncSearch    cterm=reverse gui=reverse",
+  "ModeMsg      cterm=bold gui=bold",
+  "NonText      ctermfg=Blue gui=bold guifg=Blue",
+  "Normal       cterm=NONE gui=NONE",
+  "PmenuSbar    ctermbg=Grey guibg=Grey",
+  "StatusLine   cterm=reverse,bold gui=reverse,bold",
+  "StatusLineNC cterm=reverse gui=reverse",
+  "TabLineFill  cterm=reverse gui=reverse",
+  "TabLineSel   cterm=bold gui=bold",
+  "TermCursor   cterm=reverse gui=reverse",
+  "VertSplit    cterm=reverse gui=reverse",
+  "WildMenu     ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black",
+  "default link WinSeparator VertSplit",
+  "default link EndOfBuffer NonText",
+  "default link LineNrAbove LineNr",
+  "default link LineNrBelow LineNr",
+  "default link QuickFixLine Search",
+  "default link CursorLineSign SignColumn",
+  "default link CursorLineFold FoldColumn",
+  "default link Substitute Search",
+  "default link Whitespace NonText",
+  "default link MsgSeparator StatusLine",
+  "default link NormalFloat Pmenu",
+  "default link FloatBorder WinSeparator",
+  "default FloatShadow blend=80 guibg=Black",
+  "default FloatShadowThrough blend=100 guibg=Black",
+  "RedrawDebugNormal cterm=reverse gui=reverse",
+  "RedrawDebugClear ctermbg=Yellow guibg=Yellow",
+  "RedrawDebugComposed ctermbg=Green guibg=Green",
+  "RedrawDebugRecompose ctermbg=Red guibg=Red",
+  "Error term=reverse cterm=NONE ctermfg=White ctermbg=Red gui=NONE guifg=White guibg=Red",
+  "Todo term=standout cterm=NONE ctermfg=Black ctermbg=Yellow gui=NONE guifg=Blue guibg=Yellow",
+  "default link String Constant",
+  "default link Character Constant",
+  "default link Number Constant",
+  "default link Boolean Constant",
+  "default link Float Number",
+  "default link Function Identifier",
+  "default link Conditional Statement",
+  "default link Repeat Statement",
+  "default link Label Statement",
+  "default link Operator Statement",
+  "default link Keyword Statement",
+  "default link Exception Statement",
+  "default link Include PreProc",
+  "default link Define PreProc",
+  "default link Macro PreProc",
+  "default link PreCondit PreProc",
+  "default link StorageClass Type",
+  "default link Structure Type",
+  "default link Typedef Type",
+  "default link Tag Special",
+  "default link SpecialChar Special",
+  "default link Delimiter Special",
+  "default link SpecialComment Special",
+  "default link Debug Special",
+  "default DiagnosticError ctermfg=1 guifg=Red",
+  "default DiagnosticWarn ctermfg=3 guifg=Orange",
+  "default DiagnosticInfo ctermfg=4 guifg=LightBlue",
+  "default DiagnosticHint ctermfg=7 guifg=LightGrey",
+  "default DiagnosticUnderlineError cterm=underline gui=underline guisp=Red",
+  "default DiagnosticUnderlineWarn cterm=underline gui=underline guisp=Orange",
+  "default DiagnosticUnderlineInfo cterm=underline gui=underline guisp=LightBlue",
+  "default DiagnosticUnderlineHint cterm=underline gui=underline guisp=LightGrey",
+  "default link DiagnosticVirtualTextError DiagnosticError",
+  "default link DiagnosticVirtualTextWarn DiagnosticWarn",
+  "default link DiagnosticVirtualTextInfo DiagnosticInfo",
+  "default link DiagnosticVirtualTextHint DiagnosticHint",
+  "default link DiagnosticFloatingError DiagnosticError",
+  "default link DiagnosticFloatingWarn DiagnosticWarn",
+  "default link DiagnosticFloatingInfo DiagnosticInfo",
+  "default link DiagnosticFloatingHint DiagnosticHint",
+  "default link DiagnosticSignError DiagnosticError",
+  "default link DiagnosticSignWarn DiagnosticWarn",
+  "default link DiagnosticSignInfo DiagnosticInfo",
+  "default link DiagnosticSignHint DiagnosticHint",
+  NULL
+};
+
+// Default colors only used with a light background.
+static const char *highlight_init_light[] = {
+  "ColorColumn  ctermbg=LightRed guibg=LightRed",
+  "CursorColumn ctermbg=LightGrey guibg=Grey90",
+  "CursorLine   cterm=underline guibg=Grey90",
+  "CursorLineNr cterm=underline ctermfg=Brown gui=bold guifg=Brown",
+  "DiffAdd      ctermbg=LightBlue guibg=LightBlue",
+  "DiffChange   ctermbg=LightMagenta guibg=LightMagenta",
+  "DiffDelete   ctermfg=Blue ctermbg=LightCyan gui=bold guifg=Blue guibg=LightCyan",
+  "Directory    ctermfg=DarkBlue guifg=Blue",
+  "FoldColumn   ctermbg=Grey ctermfg=DarkBlue guibg=Grey guifg=DarkBlue",
+  "Folded       ctermbg=Grey ctermfg=DarkBlue guibg=LightGrey guifg=DarkBlue",
+  "LineNr       ctermfg=Brown guifg=Brown",
+  "MatchParen   ctermbg=Cyan guibg=Cyan",
+  "MoreMsg      ctermfg=DarkGreen gui=bold guifg=SeaGreen",
+  "Pmenu        ctermbg=LightMagenta ctermfg=Black guibg=LightMagenta",
+  "PmenuSel     ctermbg=LightGrey ctermfg=Black guibg=Grey",
+  "PmenuThumb   ctermbg=Black guibg=Black",
+  "Question     ctermfg=DarkGreen gui=bold guifg=SeaGreen",
+  "Search       ctermbg=Yellow ctermfg=NONE guibg=Yellow guifg=NONE",
+  "SignColumn   ctermbg=Grey ctermfg=DarkBlue guibg=Grey guifg=DarkBlue",
+  "SpecialKey   ctermfg=DarkBlue guifg=Blue",
+  "SpellBad     ctermbg=LightRed guisp=Red gui=undercurl",
+  "SpellCap     ctermbg=LightBlue guisp=Blue gui=undercurl",
+  "SpellLocal   ctermbg=Cyan guisp=DarkCyan gui=undercurl",
+  "SpellRare    ctermbg=LightMagenta guisp=Magenta gui=undercurl",
+  "TabLine      cterm=underline ctermfg=black ctermbg=LightGrey gui=underline guibg=LightGrey",
+  "Title        ctermfg=DarkMagenta gui=bold guifg=Magenta",
+  "Visual       guibg=LightGrey",
+  "WarningMsg   ctermfg=DarkRed guifg=Red",
+  "Comment      term=bold cterm=NONE ctermfg=DarkBlue ctermbg=NONE gui=NONE guifg=Blue guibg=NONE",
+  "Constant     term=underline cterm=NONE ctermfg=DarkRed ctermbg=NONE gui=NONE guifg=Magenta guibg=NONE",
+  "Special      term=bold cterm=NONE ctermfg=DarkMagenta ctermbg=NONE gui=NONE guifg=#6a5acd guibg=NONE",
+  "Identifier   term=underline cterm=NONE ctermfg=DarkCyan ctermbg=NONE gui=NONE guifg=DarkCyan guibg=NONE",
+  "Statement    term=bold cterm=NONE ctermfg=Brown ctermbg=NONE gui=bold guifg=Brown guibg=NONE",
+  "PreProc      term=underline cterm=NONE ctermfg=DarkMagenta ctermbg=NONE gui=NONE guifg=#6a0dad guibg=NONE",
+  "Type         term=underline cterm=NONE ctermfg=DarkGreen ctermbg=NONE gui=bold guifg=SeaGreen guibg=NONE",
+  "Underlined   term=underline cterm=underline ctermfg=DarkMagenta gui=underline guifg=SlateBlue",
+  "Ignore       term=NONE cterm=NONE ctermfg=white ctermbg=NONE gui=NONE guifg=bg guibg=NONE",
+  NULL
+};
+
+// Default colors only used with a dark background.
+static const char *highlight_init_dark[] = {
+  "ColorColumn  ctermbg=DarkRed guibg=DarkRed",
+  "CursorColumn ctermbg=DarkGrey guibg=Grey40",
+  "CursorLine   cterm=underline guibg=Grey40",
+  "CursorLineNr cterm=underline ctermfg=Yellow gui=bold guifg=Yellow",
+  "DiffAdd      ctermbg=DarkBlue guibg=DarkBlue",
+  "DiffChange   ctermbg=DarkMagenta guibg=DarkMagenta",
+  "DiffDelete   ctermfg=Blue ctermbg=DarkCyan gui=bold guifg=Blue guibg=DarkCyan",
+  "Directory    ctermfg=LightCyan guifg=Cyan",
+  "FoldColumn   ctermbg=DarkGrey ctermfg=Cyan guibg=Grey guifg=Cyan",
+  "Folded       ctermbg=DarkGrey ctermfg=Cyan guibg=DarkGrey guifg=Cyan",
+  "LineNr       ctermfg=Yellow guifg=Yellow",
+  "MatchParen   ctermbg=DarkCyan guibg=DarkCyan",
+  "MoreMsg      ctermfg=LightGreen gui=bold guifg=SeaGreen",
+  "Pmenu        ctermbg=Magenta ctermfg=Black guibg=Magenta",
+  "PmenuSel     ctermbg=Black ctermfg=DarkGrey guibg=DarkGrey",
+  "PmenuThumb   ctermbg=White guibg=White",
+  "Question     ctermfg=LightGreen gui=bold guifg=Green",
+  "Search       ctermbg=Yellow ctermfg=Black guibg=Yellow guifg=Black",
+  "SignColumn   ctermbg=DarkGrey ctermfg=Cyan guibg=Grey guifg=Cyan",
+  "SpecialKey   ctermfg=LightBlue guifg=Cyan",
+  "SpellBad     ctermbg=Red guisp=Red gui=undercurl",
+  "SpellCap     ctermbg=Blue guisp=Blue gui=undercurl",
+  "SpellLocal   ctermbg=Cyan guisp=Cyan gui=undercurl",
+  "SpellRare    ctermbg=Magenta guisp=Magenta gui=undercurl",
+  "TabLine      cterm=underline ctermfg=white ctermbg=DarkGrey gui=underline guibg=DarkGrey",
+  "Title        ctermfg=LightMagenta gui=bold guifg=Magenta",
+  "Visual       guibg=DarkGrey",
+  "WarningMsg   ctermfg=LightRed guifg=Red",
+  "Comment      term=bold cterm=NONE ctermfg=Cyan ctermbg=NONE gui=NONE guifg=#80a0ff guibg=NONE",
+  "Constant     term=underline cterm=NONE ctermfg=Magenta ctermbg=NONE gui=NONE guifg=#ffa0a0 guibg=NONE",
+  "Special      term=bold cterm=NONE ctermfg=LightRed ctermbg=NONE gui=NONE guifg=Orange guibg=NONE",
+  "Identifier   term=underline cterm=bold ctermfg=Cyan ctermbg=NONE gui=NONE guifg=#40ffff guibg=NONE",
+  "Statement    term=bold cterm=NONE ctermfg=Yellow ctermbg=NONE gui=bold guifg=#ffff60 guibg=NONE",
+  "PreProc      term=underline cterm=NONE ctermfg=LightBlue ctermbg=NONE gui=NONE guifg=#ff80ff guibg=NONE",
+  "Type         term=underline cterm=NONE ctermfg=LightGreen ctermbg=NONE gui=bold guifg=#60ff60 guibg=NONE",
+  "Underlined   term=underline cterm=underline ctermfg=LightBlue gui=underline guifg=#80a0ff",
+  "Ignore       term=NONE cterm=NONE ctermfg=black ctermbg=NONE gui=NONE guifg=bg guibg=NONE",
+  NULL
+};
+
+const char *const highlight_init_cmdline[] = {
+  // XXX When modifying a list modify it in both valid and invalid halves.
+  // TODO(ZyX-I): merge valid and invalid groups via a macros.
+
+  // NvimInternalError should appear only when highlighter has a bug.
+  "NvimInternalError ctermfg=Red ctermbg=Red guifg=Red guibg=Red",
+
+  // Highlight groups (links) used by parser:
+
+  "default link NvimAssignment Operator",
+  "default link NvimPlainAssignment NvimAssignment",
+  "default link NvimAugmentedAssignment NvimAssignment",
+  "default link NvimAssignmentWithAddition NvimAugmentedAssignment",
+  "default link NvimAssignmentWithSubtraction NvimAugmentedAssignment",
+  "default link NvimAssignmentWithConcatenation NvimAugmentedAssignment",
+
+  "default link NvimOperator Operator",
+
+  "default link NvimUnaryOperator NvimOperator",
+  "default link NvimUnaryPlus NvimUnaryOperator",
+  "default link NvimUnaryMinus NvimUnaryOperator",
+  "default link NvimNot NvimUnaryOperator",
+
+  "default link NvimBinaryOperator NvimOperator",
+  "default link NvimComparison NvimBinaryOperator",
+  "default link NvimComparisonModifier NvimComparison",
+  "default link NvimBinaryPlus NvimBinaryOperator",
+  "default link NvimBinaryMinus NvimBinaryOperator",
+  "default link NvimConcat NvimBinaryOperator",
+  "default link NvimConcatOrSubscript NvimConcat",
+  "default link NvimOr NvimBinaryOperator",
+  "default link NvimAnd NvimBinaryOperator",
+  "default link NvimMultiplication NvimBinaryOperator",
+  "default link NvimDivision NvimBinaryOperator",
+  "default link NvimMod NvimBinaryOperator",
+
+  "default link NvimTernary NvimOperator",
+  "default link NvimTernaryColon NvimTernary",
+
+  "default link NvimParenthesis Delimiter",
+  "default link NvimLambda NvimParenthesis",
+  "default link NvimNestingParenthesis NvimParenthesis",
+  "default link NvimCallingParenthesis NvimParenthesis",
+
+  "default link NvimSubscript NvimParenthesis",
+  "default link NvimSubscriptBracket NvimSubscript",
+  "default link NvimSubscriptColon NvimSubscript",
+  "default link NvimCurly NvimSubscript",
+
+  "default link NvimContainer NvimParenthesis",
+  "default link NvimDict NvimContainer",
+  "default link NvimList NvimContainer",
+
+  "default link NvimIdentifier Identifier",
+  "default link NvimIdentifierScope NvimIdentifier",
+  "default link NvimIdentifierScopeDelimiter NvimIdentifier",
+  "default link NvimIdentifierName NvimIdentifier",
+  "default link NvimIdentifierKey NvimIdentifier",
+
+  "default link NvimColon Delimiter",
+  "default link NvimComma Delimiter",
+  "default link NvimArrow Delimiter",
+
+  "default link NvimRegister SpecialChar",
+  "default link NvimNumber Number",
+  "default link NvimFloat NvimNumber",
+  "default link NvimNumberPrefix Type",
+
+  "default link NvimOptionSigil Type",
+  "default link NvimOptionName NvimIdentifier",
+  "default link NvimOptionScope NvimIdentifierScope",
+  "default link NvimOptionScopeDelimiter NvimIdentifierScopeDelimiter",
+
+  "default link NvimEnvironmentSigil NvimOptionSigil",
+  "default link NvimEnvironmentName NvimIdentifier",
+
+  "default link NvimString String",
+  "default link NvimStringBody NvimString",
+  "default link NvimStringQuote NvimString",
+  "default link NvimStringSpecial SpecialChar",
+
+  "default link NvimSingleQuote NvimStringQuote",
+  "default link NvimSingleQuotedBody NvimStringBody",
+  "default link NvimSingleQuotedQuote NvimStringSpecial",
+
+  "default link NvimDoubleQuote NvimStringQuote",
+  "default link NvimDoubleQuotedBody NvimStringBody",
+  "default link NvimDoubleQuotedEscape NvimStringSpecial",
+
+  "default link NvimFigureBrace NvimInternalError",
+  "default link NvimSingleQuotedUnknownEscape NvimInternalError",
+
+  "default link NvimSpacing Normal",
+
+  // NvimInvalid groups:
+
+  "default link NvimInvalidSingleQuotedUnknownEscape NvimInternalError",
+
+  "default link NvimInvalid Error",
+
+  "default link NvimInvalidAssignment NvimInvalid",
+  "default link NvimInvalidPlainAssignment NvimInvalidAssignment",
+  "default link NvimInvalidAugmentedAssignment NvimInvalidAssignment",
+  "default link NvimInvalidAssignmentWithAddition NvimInvalidAugmentedAssignment",
+  "default link NvimInvalidAssignmentWithSubtraction NvimInvalidAugmentedAssignment",
+  "default link NvimInvalidAssignmentWithConcatenation NvimInvalidAugmentedAssignment",
+
+  "default link NvimInvalidOperator NvimInvalid",
+
+  "default link NvimInvalidUnaryOperator NvimInvalidOperator",
+  "default link NvimInvalidUnaryPlus NvimInvalidUnaryOperator",
+  "default link NvimInvalidUnaryMinus NvimInvalidUnaryOperator",
+  "default link NvimInvalidNot NvimInvalidUnaryOperator",
+
+  "default link NvimInvalidBinaryOperator NvimInvalidOperator",
+  "default link NvimInvalidComparison NvimInvalidBinaryOperator",
+  "default link NvimInvalidComparisonModifier NvimInvalidComparison",
+  "default link NvimInvalidBinaryPlus NvimInvalidBinaryOperator",
+  "default link NvimInvalidBinaryMinus NvimInvalidBinaryOperator",
+  "default link NvimInvalidConcat NvimInvalidBinaryOperator",
+  "default link NvimInvalidConcatOrSubscript NvimInvalidConcat",
+  "default link NvimInvalidOr NvimInvalidBinaryOperator",
+  "default link NvimInvalidAnd NvimInvalidBinaryOperator",
+  "default link NvimInvalidMultiplication NvimInvalidBinaryOperator",
+  "default link NvimInvalidDivision NvimInvalidBinaryOperator",
+  "default link NvimInvalidMod NvimInvalidBinaryOperator",
+
+  "default link NvimInvalidTernary NvimInvalidOperator",
+  "default link NvimInvalidTernaryColon NvimInvalidTernary",
+
+  "default link NvimInvalidDelimiter NvimInvalid",
+
+  "default link NvimInvalidParenthesis NvimInvalidDelimiter",
+  "default link NvimInv