plugins/conform: init + test (#667)

tests/test-sources/plugins/lsp/conform-nvim.nix

@@ -0,0 +1,62 @@
+{
+  empty = {
+    plugins.conform-nvim.enable = true;
+  };
+
+  default = {
+    plugins.conform-nvim = {
+      enable = true;
+
+      formattersByFt = {
+        lua = ["stylua"];
+        python = ["isort" "black"];
+        javascript = [["prettierd" "prettier"]];
+        "*" = ["codespell"];
+        "_" = ["trimWhitespace"];
+      };
+      formatOnSave = {
+        lspFallback = true;
+        timeoutMs = 500;
+      };
+      formatAfterSave = {
+        lspFallback = true;
+      };
+      logLevel = "ERROR";
+      notifyOnError = true;
+      formatters = {
+        myFormatter = {
+          command = "myCmd";
+          args = ["--stdin-from-filename" "$FILENAME"];
+          rangeArgs = ''
+            function(ctx)
+              return { "--line-start", ctx.range.start[1], "--line-end", ctx.range["end"][1] }
+            end;
+          '';
+          stdin = true;
+          cwd = ''
+            require("conform.util").rootFile({ ".editorconfig", "package.json" });
+          '';
+          requireCwd = true;
+          condition = ''
+            function(ctx)
+              return vim.fs.basename(ctx.filename) ~= "README.md"
+            end;
+          '';
+          exitCodes = [0 1];
+          env = {
+            VAR = "value";
+          };
+          "inherit" = true;
+          prependArgs = ["--use-tabs"];
+        };
+        otherFormatter = ''
+          function(bufnr)
+            return {
+              command = "myCmd";
+            }
+          end;
+        '';
+      };
+    };
+  };
+}