plugins/lean: init + test

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

@@ -0,0 +1,85 @@
+{
+  empty = {
+    plugins.lean.enable = true;
+  };
+
+  # Enable the `leanls` LSP directly from `plugins.lsp`. This implies explicitly disabling the lsp
+  # in the `lean` plugin configuration.
+  lspDisabled = {
+    plugins = {
+      lsp = {
+        enable = true;
+
+        servers.leanls.enable = true;
+      };
+
+      lean = {
+        enable = true;
+
+        lsp.enable = false;
+      };
+    };
+  };
+
+  default = {
+    plugins = {
+      lsp.enable = true;
+
+      lean = {
+        enable = true;
+
+        lsp = {};
+        ft = {
+          default = "lean";
+          nomodifiable = null;
+        };
+        abbreviations = {
+          enable = true;
+          extra = {
+            wknight = "♘";
+          };
+          leader = "\\";
+        };
+        mappings = false;
+        infoview = {
+          autoopen = true;
+          autopause = false;
+          width = 50;
+          height = 20;
+          horizontalPosition = "bottom";
+          separateTab = false;
+          indicators = "auto";
+          lean3 = {
+            showFilter = true;
+            mouseEvents = false;
+          };
+          showProcessing = true;
+          showNoInfoMessage = false;
+          useWidgets = true;
+          mappings = {
+            K = "click";
+            "<CR>" = "click";
+            gd = "go_to_def";
+            gD = "go_to_decl";
+            gy = "go_to_type";
+            I = "mouse_enter";
+            i = "mouse_leave";
+            "<Esc>" = "clear_all";
+            C = "clear_all";
+            "<LocalLeader><Tab>" = "goto_last_window";
+          };
+        };
+        progressBars = {
+          enable = true;
+          priority = 10;
+        };
+        stderr = {
+          enable = true;
+          height = 5;
+          onLines = "function(lines) vim.notify(lines) end";
+        };
+        lsp3 = {};
+      };
+    };
+  };
+}