Expose functionality

lua/highlite.lua

@@ -1,4 +1,5 @@
 --[[ NOTHING INSIDE THIS FILE NEEDS TO BE EDITED BY THE USER. ]]
+local highlite = {}
 local vim = vim
 
 -- Clear the highlighting.
@@ -11,13 +12,13 @@ vim.g.indent_guides_auto_colors = 0
 if vim.fn.exists('syntax_on') then vim.cmd('syntax reset') end
 
 -- Determine which set of colors to use.
-local using_hex_or_256 = tonumber(vim.o.t_Co) >= 256
+highlite.using_hex_or_256 = tonumber(vim.o.t_Co) >= 256
 	or vim.o.termguicolors
 	or vim.fn.has('gui_running')
 	or string.find(vim.fn.expand('$TERM'), '256')
 
 -- If we aren't using the hex and 256 colorset, then set the &t_Co variable to 16.
-if not using_hex_or_256 then vim.o.t_Co = 16 end
+if not highlite.using_hex_or_256 then vim.o.t_Co = 16 end
 
 -- These are constants for the indexes in the colors that were defined before.
 local PALETTE_ANSI = 3
@@ -45,7 +46,7 @@ end --}}} ‡
 
 --[[ If using hex and 256-bit colors, then populate the gui* and cterm* args.
 	If using 16-bit colors, just populate the cterm* args. ]]
-local colorize = using_hex_or_256 and function(command, attributes) -- {{{ †
+local colorize = highlite.using_hex_or_256 and function(command, attributes) -- {{{ †
 	command[#command + 1] =
 		' ctermbg='..get(attributes.bg, PALETTE_256)
 		..' ctermfg='..get(attributes.fg, PALETTE_256)
@@ -60,7 +61,7 @@ end or function(command, attributes)
 end --}}} ‡
 
 -- This function appends `selected_attributes` to the end of `highlight_cmd`.
-local stylize = using_hex_or_256 and function(command, style, color) -- {{{ †
+local stylize = highlite.using_hex_or_256 and function(command, style, color) -- {{{ †
 	command[#command + 1] = ' cterm='..style..' gui='..style
 
 	if color then -- There is an undercurl color.
@@ -71,7 +72,7 @@ end or function(command, style)
 end --}}} ‡
 
 -- Generate a `:highlight` command from a group and some attributes.
-local function highlight(highlight_group, attributes) -- {{{ †
+function highlite.highlight(highlight_group, attributes) -- {{{ †
 	-- The base highlight command
 	local highlight_cmd = {'hi! ', highlight_group}
 
@@ -82,8 +83,7 @@ local function highlight(highlight_group, attributes) -- {{{ †
 	end
 
 	-- Determine if there is a highlight link, and if so, assign it.
-	local link = (type(attributes) == 'string' and attributes)
+	local link = (type(attributes) == 'string') and attributes or attributes.link
-		or attributes.link
 
 	if link then -- `highlight_group` is a link to another group.
 		highlight_cmd[3] = highlight_cmd[2]..' '
@@ -104,17 +104,23 @@ local function highlight(highlight_group, attributes) -- {{{ †
 	vim.cmd(table.concat(highlight_cmd))
 end --}}} ‡
 
-return function(Normal, highlights, terminal_ansi_colors)
+function highlite:highlight_terminal(terminal_ansi_colors)
-	-- Highlight the baseline.
+	if self.using_hex_or_256 then for index, color in ipairs(terminal_ansi_colors) do
-	highlight('Normal', Normal)
-
-	-- Highlight everything else.
-	for highlight_group, attributes in pairs(highlights) do
-		highlight(highlight_group, attributes)
-	end
-
-	-- Set the terminal colors.
-	if using_hex_or_256 then for index, color in ipairs(terminal_ansi_colors) do
 		vim.g['terminal_color_'..index] = vim.o.termguicolors and color[PALETTE_HEX] or color[PALETTE_256]
 	end end
 end
+
+return setmetatable(highlite, {
+	['__call'] = function(self, normal, highlights, terminal_ansi_colors)
+		-- Highlight the baseline.
+		self.highlight('Normal', normal)
+
+		-- Highlight everything else.
+		for highlight_group, attributes in pairs(highlights) do
+			self.highlight(highlight_group, attributes)
+		end
+
+		-- Set the terminal highlight colors.
+		self:highlight_terminal(terminal_ansi_colors)
+	end
+})