nvim: Add coverage support for python testing

Use `,tp` to load a coverage report and show it in the gutter.
Use `,tP` to toggle it off and on. Use `,ts` to show a summary
instead.

nvim/.config/nvim/lua/plugins/ide.lua

@@ -102,14 +102,15 @@ return {
 		config = function()
 			require("neotest").setup({
 				adapters = {
-					require("neotest-python"),
+					require("neotest-python")({
+					    -- with coverage requires coverage.py and pytest-cov installed
+						args = { "--cov" },
+					}),
 				},
 			})
-			for _, v in pairs(require("lazy").plugins()) do
-				if v[1] == "folke/which-key.nvim" then
-					require("which-key").register({ ["<localleader>t"] = { name = "+test" } })
-					break
-				end
+			local status, wk = pcall(require, "which-key")
+			if status then
+				wk.register({ ["<localleader>t"] = { name = "+test" } })
 			end
 		end,
 		keys = {
@@ -169,4 +170,47 @@ return {
 			},
 		},
 	},
+	-- TODO needs to pick up poetry env for python,
+	-- currently just hard-codes running through poetry
+	{
+		"andythigpen/nvim-coverage",
+		dependencies = {
+			"nvim-lua/plenary.nvim",
+		},
+		config = function()
+			require("coverage").setup({
+				lang = { python = { coverage_command = "poetry run coverage json -q -o -" } } ,
+			})
+		end,
+		cmd = {
+			"Coverage",
+			"CoverageLoad",
+			"CoverageLoadLcov",
+			"CoverageShow",
+			"CoverageHide",
+			"CoverageToggle",
+			"CoverageClear",
+			"CoverageSummary",
+		},
+		keys = {
+			{
+				"<localleader>tp",
+				[[<cmd>Coverage<cr>]],
+				desc = "show coverage report",
+				silent = true,
+			},
+			{
+				"<localleader>tP",
+				[[<cmd>CoverageToggle<cr>]],
+				desc = "toggle coverage gutter",
+				silent = true,
+			},
+			{
+				"<localleader>ts",
+				[[<cmd>CoverageSummary<cr>]],
+				desc = "show coverage summary",
+				silent = true,
+			},
+		}
+	},
 }