140 lines
3.2 KiB
Lua
140 lines
3.2 KiB
Lua
local Class = require("nvim-tree.classic")
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---@alias DecoratorRange "none" | "icon" | "name" | "all"
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---@alias DecoratorIconPlacement "none" | "before" | "after" | "signcolumn" | "right_align"
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---Abstract Decorator
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---@class (exact) Decorator: Class
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---@field protected enabled boolean
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---@field protected range DecoratorRange
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---@field protected icon_placement DecoratorIconPlacement
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local Decorator = Class:extend()
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---@class (exact) DecoratorArgs
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---@field enabled boolean
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---@field hl_pos DecoratorRange
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---@field icon_placement DecoratorIconPlacement
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---@protected
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---@param args DecoratorArgs
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function Decorator:new(args)
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self.enabled = args.enabled
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self.range = args.hl_pos
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self.icon_placement = args.icon_placement
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end
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---Maybe highlight groups
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---@param node Node
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---@return string|nil icon highlight group
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---@return string|nil name highlight group
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function Decorator:groups_icon_name(node)
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local icon_hl, name_hl
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if self.enabled and self.range ~= "none" then
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local hl = self:calculate_highlight(node)
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if self.range == "all" or self.range == "icon" then
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icon_hl = hl
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end
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if self.range == "all" or self.range == "name" then
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name_hl = hl
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end
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end
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return icon_hl, name_hl
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end
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---Maybe icon sign
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---@param node Node
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---@return string|nil name
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function Decorator:sign_name(node)
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if not self.enabled or self.icon_placement ~= "signcolumn" then
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return
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end
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local icons = self:calculate_icons(node)
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if icons and #icons > 0 then
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return icons[1].hl[1]
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end
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end
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---Icons when "before"
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---@param node Node
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---@return HighlightedString[]|nil icons
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function Decorator:icons_before(node)
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if not self.enabled or self.icon_placement ~= "before" then
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return
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end
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return self:calculate_icons(node)
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end
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---Icons when "after"
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---@param node Node
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---@return HighlightedString[]|nil icons
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function Decorator:icons_after(node)
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if not self.enabled or self.icon_placement ~= "after" then
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return
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end
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return self:calculate_icons(node)
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end
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---Icons when "right_align"
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---@param node Node
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---@return HighlightedString[]|nil icons
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function Decorator:icons_right_align(node)
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if not self.enabled or self.icon_placement ~= "right_align" then
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return
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end
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return self:calculate_icons(node)
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end
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---Maybe icons, optionally implemented
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---@protected
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---@param _ Node
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---@return HighlightedString[]|nil icons
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function Decorator:calculate_icons(_)
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return nil
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end
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---Maybe highlight group, optionally implemented
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---@protected
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---@param _ Node
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---@return string|nil group
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function Decorator:calculate_highlight(_)
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return nil
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end
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---Define a sign
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---@protected
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---@param icon HighlightedString|nil
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function Decorator:define_sign(icon)
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if icon and #icon.hl > 0 then
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local name = icon.hl[1]
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if not vim.tbl_isempty(vim.fn.sign_getdefined(name)) then
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vim.fn.sign_undefine(name)
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end
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-- don't use sign if not defined
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if #icon.str < 1 then
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self.icon_placement = "none"
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return
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end
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-- byte index of the next character, allowing for wide
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local bi = vim.fn.byteidx(icon.str, 1)
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-- first (wide) character, falls back to empty string
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local text = string.sub(icon.str, 1, bi)
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vim.fn.sign_define(name, {
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text = text,
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texthl = name,
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})
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end
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end
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return Decorator
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