From bec2c982ff6dcfff6dc76fc39cd0984384abad3e Mon Sep 17 00:00:00 2001
From: ache <ache@ache.one>
Date: Sun, 21 Dec 2025 10:27:53 +0100
Subject: feat: add line diagnostics with tools info to lsp and create new
 keymap for it

---
 lua/ache/diagnostics.lua | 55 ++++++++++++++++++++++++++++++++++++++++++++++++
 lua/ache/lazy.lua        |  7 ++++++
 2 files changed, 62 insertions(+)
 create mode 100644 lua/ache/diagnostics.lua

diff --git a/lua/ache/diagnostics.lua b/lua/ache/diagnostics.lua
new file mode 100644
index 0000000..5f70177
--- /dev/null
+++ b/lua/ache/diagnostics.lua
@@ -0,0 +1,55 @@
+local M = {}
+
+local serverity_map = {
+	"DiagnosticError",
+	"DiagnosticWarn",
+	"DiagnosticInfo",
+	"DiagnosticHint",
+}
+local icon_map = {
+	"  ",
+	"  ",
+	"  ",
+	"  ",
+}
+
+local function source_string(source, code)
+	if code then
+		return string.format("  [%s %s]", source, code)
+	else
+		return string.format("  [%s]", source)
+	end
+end
+
+M.line_diagnostics = function()
+	local bufnr, lnum = unpack(vim.fn.getcurpos())
+	local diagnostics = vim.lsp.diagnostic.get_line_diagnostics(bufnr, lnum - 1, {})
+	if vim.tbl_isempty(diagnostics) then
+		return
+	end
+
+	local lines = {}
+
+	for _, diagnostic in ipairs(diagnostics) do
+		table.insert(
+			lines,
+			icon_map[diagnostic.severity]
+				.. " "
+				.. diagnostic.message:gsub("\n", " ")
+				.. source_string(diagnostic.source, diagnostic.code)
+		)
+	end
+
+	local floating_bufnr, _ = vim.lsp.util.open_floating_preview(lines, "plaintext", {
+		border = vim.g.floating_window_border_dark,
+		focus_id = "line",
+	})
+
+	for i, diagnostic in ipairs(diagnostics) do
+		local message_length = #lines[i] - #source_string(diagnostic.source, diagnostic.code)
+		vim.api.nvim_buf_add_highlight(floating_bufnr, -1, serverity_map[diagnostic.severity], i - 1, 0, message_length)
+		vim.api.nvim_buf_add_highlight(floating_bufnr, -1, "DiagnosticSource", i - 1, message_length, -1)
+	end
+end
+
+return M
diff --git a/lua/ache/lazy.lua b/lua/ache/lazy.lua
index e01d3cb..1800f12 100644
--- a/lua/ache/lazy.lua
+++ b/lua/ache/lazy.lua
@@ -160,5 +160,12 @@ vim.api.nvim_create_autocmd("LspAttach", {
 			vim.lsp.buf.code_action,
 			{ buffer = args.buf, desc = "Lsp: See available code actions" }
 		)
+
+		vim.keymap.set(
+			"n",
+			"<leader>lt",
+			require("ache.diagnostics").line_diagnostics,
+			{ buffer = args.buf, silent = true, desc = "Show diagnostics tools used" }
+		)
 	end,
 })
-- 
cgit v1.3-2-g11bf