paper-tonic/lua/highlite.lua

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--[[ NOTHING INSIDE THIS FILE NEEDS TO BE EDITED BY THE USER. ]]
--[[
/*
* IMPORTS
*/
--]]
local vim = vim
local api = vim.api
local exe = api.nvim_command
local fn = vim.fn
local go = vim.go
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--[[
/*
* VARS
*/
--]]
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-- Determine which set of colors to use.
local _USE_256 = tonumber(go.t_Co) > 255 or string.find(vim.env.TERM, '256')
-- These are constants for the indexes in the colors that were defined before.
local _NONE = 'NONE'
local _PALETTE_CTERM = _USE_256 and 2 or 3
local _PALETTE_HEX = 1
local _TYPE_STRING = 'string'
local _TYPE_TABLE = 'table'
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--[[
/*
* HELPER FUNCTIONS
*/
--]]
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-- filter a highlight group's style information
local function filter_group_style(value)
return value ~= 'background'
and value ~= 'blend'
and value ~= 'foreground'
and value ~= 'special'
end
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-- Get the color value of a color variable, or "NONE" as a default.
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local function get(color, index) -- {{{ †
if type(color) == _TYPE_TABLE and color[index] then
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return color[index]
elseif type(color) == _TYPE_STRING then
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return color
else
return _NONE
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end
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end --}}} ‡
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--[[ 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 function colorize(command, attributes) -- {{{ †
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command[#command+1]=' guibg='..get(attributes.bg, _PALETTE_HEX)..' guifg='..get(attributes.fg, _PALETTE_HEX)
..' ctermbg='..get(attributes.bg, _PALETTE_CTERM)..' ctermfg='..get(attributes.fg, _PALETTE_CTERM)
-- Add the `blend` parameter if it is present
if attributes.blend then -- There is a value for the `highlight-blend` field.
command[#command+1]=' blend='..attributes.blend
end
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end --}}} ‡
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-- This function appends `selected_attributes` to the end of `highlight_cmd`.
local function stylize(command, style, color)
command[#command+1]=' gui='..style..' cterm='..style
if color then -- There is an undercurl color.
command[#command+1]=' guisp='..get(color, _PALETTE_HEX)
end
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end
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local function tohex(rgb) return string.format('#%06x', rgb) end
-- Load specific &bg instructions
local function use_background_with(attributes)
return setmetatable(
attributes[go.background],
{['__index'] = attributes}
)
end
--[[
/*
* MODULE
*/
--]]
local highlite = {}
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function highlite.group(group_name)
local no_errors, group_definition = pcall(api.nvim_get_hl_by_name, group_name, go.termguicolors)
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if not no_errors then group_definition = {} end
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-- the style of the highlight group
local style = vim.tbl_filter(filter_group_style, vim.tbl_keys(group_definition))
if group_definition.special then
style.color = tohex(group_definition.special)
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end
return {
['fg'] = group_definition.foreground and tohex(group_definition.foreground) or _NONE,
['bg'] = group_definition.background and tohex(group_definition.background) or _NONE,
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['blend'] = group_definition.blend,
['style'] = style or _NONE
}
end
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-- Generate a `:highlight` command from a group and some attributes.
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function highlite.highlight(highlight_group, attributes) -- {{{ †
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-- The base highlight command
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local highlight_cmd = {'hi! ', highlight_group}
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if type(attributes) == _TYPE_STRING then -- `highlight_group` is a link to another group.
highlight_cmd[3] = highlight_cmd[2]
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highlight_cmd[2] = 'link '
highlight_cmd[4] = ' '
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highlight_cmd[5] = attributes
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else -- The `highlight_group` is uniquely defined.
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-- Take care of special instructions for certain background colors.
if attributes[go.background] then
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attributes = use_background_with(attributes)
end
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colorize(highlight_cmd, attributes)
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local style = attributes.style or _NONE
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if type(style) == _TYPE_TABLE then
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-- 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.
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stylize(highlight_cmd, style)
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end
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end
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exe(table.concat(highlight_cmd))
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end --}}} ‡
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function highlite:highlight_terminal(terminal_ansi_colors)
for index, color in ipairs(terminal_ansi_colors) do vim.g['terminal_color_'..(index-1)] =
go.termguicolors and color[_PALETTE_HEX] or color[_PALETTE_CTERM]
end
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end
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return setmetatable(highlite, {['__call'] = function(self, normal, highlights, terminal_ansi_colors)
-- function to resolve function highlight groups being defined by function calls.
local function resolve(tbl, key, resolve_links)
local value = tbl[key]
local value_type = type(value)
if value_type == 'function' then
-- lazily cache the result; next time, if it isn't a function this step will be skipped
tbl[key] = value(setmetatable({}, {
['__index'] = function(_, inner_key) return resolve(tbl, inner_key, true) end
}))
elseif value_type == _TYPE_STRING and not string.find(value, '^#') and resolve_links then
return resolve(tbl, tbl[key], resolve_links)
end
return tbl[key]
end
-- save the colors_name before syntax reset
local color_name = vim.g.colors_name
-- If the syntax has been enabled, reset it.
if fn.exists 'syntax_on' then exe 'syntax reset' end
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-- replace the colors_name
vim.g.colors_name = color_name
color_name = nil
-- If we aren't using hex nor 256 colorsets.
if not (go.termguicolors or _USE_256) then go.t_Co = '16' end
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-- Highlight the baseline.
self.highlight('Normal', normal)
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-- Highlight everything else.
for highlight_group, _ in pairs(highlights) do
self.highlight(highlight_group, resolve(highlights, highlight_group, false))
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end
-- Set the terminal highlight colors.
self:highlight_terminal(terminal_ansi_colors)
end})