Added formatting, linter, and mason_tool_install

lua/custom/plugins/linting.lua

@@ -0,0 +1,29 @@
+return {
+  "mfussenegger/nvim-lint",
+  event = {
+    "BufReadPre",
+    "BufNewFile",
+  },
+  config = function()
+    local lint = require("lint")
+
+    lint.linters_by_ft = {
+      python = { "flake8", "mypy" },
+      yaml = { "yamllint" },
+      json = { "jsonlint" }
+    }
+
+    local lint_augroup = vim.api.nvim_create_augroup("lint", { clear = true })
+
+    vim.api.nvim_create_autocmd({ "BufEnter", "BufWritePost", "InsertLeave" }, {
+      group = lint_augroup,
+      callback = function()
+        lint.try_lint()
+      end,
+    })
+
+    vim.keymap.set("n", "<leader>ml", function()
+      lint.try_lint()
+    end, { desc = "Trigger linting for current file" })
+  end,
+}