plugins/lint: init + test

tests/test-sources/plugins/languages/lint.nix

@@ -0,0 +1,69 @@
+{
+  empty = {
+    plugins.lint.enable = true;
+  };
+
+  example = {
+    plugins.lint = {
+      enable = true;
+
+      lintersByFt = {
+        text = ["vale"];
+        json = ["jsonlint"];
+        markdown = ["vale"];
+        rst = ["vale"];
+        ruby = ["ruby"];
+        janet = ["janet"];
+        inko = ["inko"];
+        clojure = ["clj-kondo"];
+        dockerfile = ["hadolint"];
+        terraform = ["tflint"];
+      };
+      linters = {
+        phpcs.args = [
+          "-q"
+          "--report=json"
+          "-"
+        ];
+      };
+      customLinters = {
+        foo = {
+          cmd = "foo_cmd";
+          stdin = true;
+          append_fname = false;
+          args = [];
+          stream = "stderr";
+          ignore_exitcode = false;
+          env = {
+            FOO = "bar";
+          };
+          parser = ''
+            require('lint.parser').from_pattern(pattern, groups, severity_map, defaults, opts)
+          '';
+        };
+        foo2 = {
+          cmd = "foo2_cmd";
+          parser = ''
+            require('lint.parser').from_pattern(pattern, groups, severity_map, defaults, opts)
+          '';
+        };
+        bar.__raw = ''
+          function()
+            return {
+              cmd = "foo_cmd",
+              stdin = true,
+              append_fname = false,
+              args = {},
+              stream = "stderr",
+              ignore_exitcode = false,
+              env = {
+                ["FOO"] = "bar",
+              },
+              parser = require('lint.parser').from_pattern(pattern, groups, severity_map, defaults, opts),
+            }
+          end
+        '';
+      };
+    };
+  };
+}