diff --git a/lua/highlite.lua b/lua/highlite.lua index 685c638..3715bd2 100644 --- a/lua/highlite.lua +++ b/lua/highlite.lua @@ -1,41 +1,39 @@ --[[ NOTHING INSIDE THIS FILE NEEDS TO BE EDITED BY THE USER. ]] -local highlite = {} + +--[[ + /* + * IMPORTS + */ +--]] + local vim = vim +local cmd = vim.api.nvim_command --- Clear the highlighting. -vim.cmd('hi clear') - --- Disable automatic coloring for the IndentGuides plugin. -vim.g.indent_guides_auto_colors = 0 - --- If the syntax has been enabled, reset it. -if vim.fn.exists('syntax_on') then vim.cmd('syntax reset') end - --- Determine which set of colors to use. -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 highlite.using_hex_or_256 then vim.o.t_Co = 16 end +--[[ + /* + * VARS + */ +--]] -- These are constants for the indexes in the colors that were defined before. -local PALETTE_ANSI = 3 -local PALETTE_256 = 2 -local PALETTE_HEX = 1 -local NONE = "NONE" +local _NONE = 'NONE' +local _PALETTE_256 = 2 +local _PALETTE_ANSI = 3 +local _PALETTE_HEX = 1 +local _TYPE_STRING = 'string' +local _TYPE_TABLE = 'table' --- Get the color value of a color variable, or "NONE" as a default. -local function get(color, index) -- {{{ † - if type(color) == 'table' and color[index] then - return color[index] - elseif type(color) == 'string' then - return color - else - return NONE - end -end --}}} ‡ +-- Determine which set of colors to use. +local _USING_HEX_OR_256 = tonumber(vim.o.t_Co) >= 256 + or vim.o.termguicolors + or vim.fn.has('gui_running') + or string.find(vim.env.TERM, '256') + +--[[ + /* + * HELPER FUNCTIONS + */ +--]] -- Add the 'blend' parameter to some highlight command, if there is one. local function blend(command, attributes) -- {{{ † @@ -44,33 +42,65 @@ local function blend(command, attributes) -- {{{ † end end --}}} ‡ +-- Get the color value of a color variable, or "NONE" as a default. +local function get(color, index) -- {{{ † + if type(color) == _TYPE_TABLE and color[index] then + return color[index] + elseif type(color) == _TYPE_STRING then + return color + else + return _NONE + end +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 = highlite.using_hex_or_256 and function(command, attributes) -- {{{ † +local colorize = _USING_HEX_OR_256 and function(command, attributes) -- {{{ † command[#command + 1] = - ' ctermbg='..get(attributes.bg, PALETTE_256) - ..' ctermfg='..get(attributes.fg, PALETTE_256) - ..' guibg='..get(attributes.bg, PALETTE_HEX) - ..' guifg='..get(attributes.fg, PALETTE_HEX) + ' ctermbg='..get(attributes.bg, _PALETTE_256) + ..' ctermfg='..get(attributes.fg, _PALETTE_256) + ..' guibg='..get(attributes.bg, _PALETTE_HEX) + ..' guifg='..get(attributes.fg, _PALETTE_HEX) blend(command, attributes) end or function(command, attributes) command[#command + 1] = - ' ctermbg='..get(attributes.bg, PALETTE_ANSI) - ..' ctermfg='..get(attributes.fg, PALETTE_ANSI) + ' ctermbg='..get(attributes.bg, _PALETTE_ANSI) + ..' ctermfg='..get(attributes.fg, _PALETTE_ANSI) blend(command, attributes) end --}}} ‡ +-- Detect attribute links and link them +local function link_attributes(attributes) + for attribute, val in pairs(attributes) do + if type(val) == _TYPE_STRING then print() end + end +end + -- This function appends `selected_attributes` to the end of `highlight_cmd`. -local stylize = highlite.using_hex_or_256 and function(command, style, color) -- {{{ † +local stylize = _USING_HEX_OR_256 and function(command, style, color) -- {{{ † command[#command + 1] = ' cterm='..style..' gui='..style if color then -- There is an undercurl color. - command[#command + 1] = ' guisp='..get(color, PALETTE_HEX) + command[#command + 1] = ' guisp='..get(color, _PALETTE_HEX) end end or function(command, style) command[#command + 1] = ' cterm='..style end --}}} ‡ +-- Load specific &bg instructions +local function use_background_with(attributes) + attributes.__index = attributes + return setmetatable(attributes[vim.o.background], attributes) +end + +--[[ + /* + * MODULE + */ +--]] + +local highlite = {} + -- Generate a `:highlight` command from a group and some attributes. function highlite.highlight(highlight_group, attributes) -- {{{ † -- The base highlight command @@ -78,22 +108,22 @@ function highlite.highlight(highlight_group, attributes) -- {{{ † -- Take care of special instructions for certain background colors. if attributes[vim.o.background] then - attributes.__index = attributes - attributes = setmetatable(attributes[vim.o.background], attributes) + attributes = use_background_with(attributes) end -- Determine if there is a highlight link, and if so, assign it. - local link = (type(attributes) == 'string') and attributes or attributes.link + local link = (type(attributes) == _TYPE_STRING) and attributes or attributes.link if link then -- `highlight_group` is a link to another group. highlight_cmd[3] = highlight_cmd[2]..' ' highlight_cmd[2] = 'link ' highlight_cmd[4] = link else -- The `highlight_group` is uniquely defined. + link_attributes(attributes) colorize(highlight_cmd, attributes) - local style = attributes.style or NONE - if type(style) == 'table' then + local style = attributes.style or _NONE + if type(style) == _TYPE_TABLE then -- Concat all of the entries together with a comma between before styling. stylize(highlight_cmd, table.concat(style, ','), style.color) else -- The style is just a single entry. @@ -101,17 +131,26 @@ function highlite.highlight(highlight_group, attributes) -- {{{ † end end - vim.cmd(table.concat(highlight_cmd)) + cmd(table.concat(highlight_cmd)) end --}}} ‡ function highlite:highlight_terminal(terminal_ansi_colors) if self.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] + 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) + -- Clear the highlighting. + cmd('hi clear') + + -- If the syntax has been enabled, reset it. + if vim.fn.exists('syntax_on') then cmd('syntax reset') end + + -- If we aren't using hex nor 256 colorsets. + if not _USING_HEX_OR_256 then vim.o.t_Co = 16 end + -- Highlight the baseline. self.highlight('Normal', normal)