Show lsp diagnostic message on cursor line

[Isrothy]

I just made a lualine component which shows lsp diagnostic message on cursor line.

local utils = require("lualine.utils.utils")
local highlight = require("lualine.highlight")

local diagnostics_message = require("lualine.component"):extend()

diagnostics_message.default = {
	colors = {
		error = utils.extract_color_from_hllist(
			{ "fg", "sp" },
			{ "DiagnosticError", "LspDiagnosticsDefaultError", "DiffDelete" },
			"#e32636"
		),
		warning = utils.extract_color_from_hllist(
			{ "fg", "sp" },
			{ "DiagnosticWarn", "LspDiagnosticsDefaultWarning", "DiffText" },
			"#ffa500"
		),
		info = utils.extract_color_from_hllist(
			{ "fg", "sp" },
			{ "DiagnosticInfo", "LspDiagnosticsDefaultInformation", "DiffChange" },
			"#ffffff"
		),
		hint = utils.extract_color_from_hllist(
			{ "fg", "sp" },
			{ "DiagnosticHint", "LspDiagnosticsDefaultHint", "DiffAdd" },
			"#273faf"
		),
	},
}
function diagnostics_message:init(options)
	diagnostics_message.super:init(options)
	self.options.colors = vim.tbl_extend("force", diagnostics_message.default.colors, self.options.colors or {})
	self.highlights = { error = "", warn = "", info = "", hint = "" }
	self.highlights.error = highlight.create_component_highlight_group(
		{ fg = self.options.colors.error },
		"diagnostics_message_error",
		self.options
	)
	self.highlights.warn = highlight.create_component_highlight_group(
		{ fg = self.options.colors.warn },
		"diagnostics_message_warn",
		self.options
	)
	self.highlights.info = highlight.create_component_highlight_group(
		{ fg = self.options.colors.info },
		"diagnostics_message_info",
		self.options
	)
	self.highlights.hint = highlight.create_component_highlight_group(
		{ fg = self.options.colors.hint },
		"diagnostics_message_hint",
		self.options
	)
end

function diagnostics_message:update_status(is_focused)
	local r, _ = unpack(vim.api.nvim_win_get_cursor(0))
	local diagnostics = vim.diagnostic.get(0, { lnum = r - 1 })
	if #diagnostics > 0 then
		local diag = diagnostics[1]
		for _, d in ipairs(diagnostics) do
			if d.severity < diag.severity then
				diagnostics = d
			end
		end
		local icons = { " ", " ", " ", " " }
		local hl = { self.highlights.error, self.highlights.warn, self.highlights.info, self.highlights.hint }
		return highlight.component_format_highlight(hl[diag.severity]) .. icons[diag.severity] .. " " .. diag.message
	else
		return ""
	end
end

require("lualine").setup({
	sections = {
		lualine_c = {
				
			{
				diagnostics_message,
				colors = {
					error = "#BF616A",
					warn = "#EBCB8B",
					info = "#A3BE8C",
					hint = "#88C0D0",
				},
			},
		},
	},
})

It looks like this

[Isrothy]

When the diagnostic message contains '%', this snip of code shall be out of order.
code below should fix this.

function diagnostics_message:update_status(is_focused)
        local r, _ = unpack(vim.api.nvim_win_get_cursor(0))
        local diagnostics = vim.diagnostic.get(0, { lnum = r - 1 })
        if #diagnostics > 0 then
	        local top = diagnostics[1]
	        for _, d in ipairs(diagnostics) do
		        if d.severity < top.severity then
			        top = d
		        end
	        end
	        local icons = { " ", " ", " ", " " }
	        local hl = {
		        self.highlights.error,
		        self.highlights.warn,
		        self.highlights.info,
		        self.highlights.hint,
	        }
	        return highlight.component_format_highlight(hl[top.severity])
		        .. icons[top.severity]
		        .. " "
		        .. utils.stl_escape(top.message)
        else
	        return ""
        end
end

[maxmahlke]

This is great! I added a catch for long messages as they were messing up my lualine components on the right hand side.

local length_max = 90
local message = top.message
            
if #message > length_max then
  message = string.sub(top.message, 1, length_max) .. " [...]"
end

return highlight.component_format_highlight(hl[top.severity])
  .. icons[top.severity]
  .. " "
  .. utils.stl_escape(message)

@Isrothy Have you considered submitting a PR to make this a built-in feautre? It's a fantastic component.

[teto]

not sure that's something to upstream (messages tend to be >1 line so statusline is not the best place) but the wiki could be a nice place

[Isrothy]

What about making it a plugin?