Introduce :insert-newline-after-require option

Context: clojure-emacs#300

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 
 * [clojure-emacs/clj-refactor.el#459](https://github.com/clojure-emacs/clj-refactor.el/issues/459): `clean-ns` should conform to the style guide: `(:require` in the ns form should be followed by a newline.
+  * You can opt out via the new `:insert-newline-after-require` configuration option.
 * [#294](https://github.com/clojure-emacs/refactor-nrepl/pull/294): Properly skip uneval nodes when looking for the first/last sexp
 * From now on, if you set the `clojure.tools.namespace.repl/refresh-dirs`, files outside said `refresh-dirs` won't be analyzed, resulting in safer, more efficient analysis.
 

README.md

@@ -88,6 +88,9 @@ Configuration settings are passed along with each msg, currently the recognized
  ;; Should `clean-ns` favor prefix forms in the ns macro?
  :prefix-rewriting true
 
+ ;; Should `pprint-ns` place a newline after the `:require` and `:import` tokens?
+ :insert-newline-after-require true
+
  ;; Some libspecs are side-effecting and shouldn't be pruned by `clean-ns`
  ;; even if they're otherwise unused.
  ;; This seq of strings will be used as regexp patterns to match

src/refactor_nrepl/config.clj

@@ -15,6 +15,9 @@
    ;; Should `clean-ns` favor prefix forms in the ns macro?
    :prefix-rewriting true
 
+   ;; Should `pprint-ns` place a newline after the `:require` and `:import` tokens?
+   :insert-newline-after-require true
+
    ;; Some libspecs are side-effecting and shouldn't be pruned by `clean-ns`
    ;; even if they're otherwise unused.
    ;; This seq of strings will be used as regexp patterns to match

src/refactor_nrepl/ns/pprint.clj

@@ -4,6 +4,7 @@
              [pprint :refer [pprint]]
              [string :as str]]
             [refactor-nrepl
+             [config :refer [*config*]]
              [core :as core :refer [prefix-form?]]
              [util :as util :refer [replace-last]]])
 
@@ -34,9 +35,15 @@
                             (printf "%s " libspec))))))
                   ordered-libspecs))))
 
+(defn insert-clause-delimiter []
+  (if (:insert-newline-after-require *config*)
+    (println)
+    (print " ")))
+
 (defn pprint-require-form
   [[_ & libspecs]]
-  (print "(:require\n")
+  (print "(:require")
+  (insert-clause-delimiter)
   (dorun
    (map-indexed
     (fn [idx libspec]
@@ -107,7 +114,8 @@
 
 (defn- pprint-import-form
   [[_ & imports]]
-  (printf "(:import ")
+  (print "(:import")
+  (insert-clause-delimiter)
   (dorun
    (map-indexed
     (fn [idx import]

test/refactor_nrepl/ns/clean_ns_test.clj

@@ -159,10 +159,12 @@
                     (:import java.util.Date)))
 
 (deftest test-pprint-artifact-ns
-  (let [path (.getAbsolutePath (File. "test/resources/artifacts_pprinted"))
-        actual (pprint-ns (with-meta artifact-ns nil))
-        expected (slurp path)]
-    (is (= expected actual))))
+  (are [setting filename] (let [actual (config/with-config {:insert-newline-after-require setting}
+                                         (pprint-ns (with-meta artifact-ns nil)))
+                                expected (-> filename File. .getAbsolutePath slurp)]
+                            (= expected actual))
+    true  "test/resources/artifacts_pprinted"
+    false "test/resources/artifacts_pprinted_traditional_newline"))
 
 (deftest handles-imports-when-only-enum-is-used
   (let [new-ns (clean-ns ns2)
@@ -231,7 +233,7 @@
 
 (deftest does-not-break-import-for-inner-class
   (let [cleaned (pprint-ns (clean-ns ns-with-inner-classes))]
-    (is (re-find #":import.*Line2D\$Double" cleaned))))
+    (is (re-find #":import\n.*Line2D\$Double" cleaned))))
 
 (deftest fallback-to-relative-path
   (is (= (pprint-ns (clean-ns ns1))

test/resources/artifacts_pprinted

@@ -11,4 +11,5 @@
     [transport :as transport]]
    [org.httpkit.client :as http]
    [refactor-nrepl.externs :refer [add-dependencies]])
-  (:import java.util.Date))
+  (:import
+   java.util.Date))

test/resources/artifacts_pprinted_traditional_newline

@@ -0,0 +1,13 @@
+(ns refactor-nrepl.artifacts
+  (:require [clojure
+             [edn :as edn]
+             [string :as str]]
+            [clojure.data.json :as json]
+            [clojure.java.io :as io]
+            [nrepl
+             [middleware :refer [set-descriptor!]]
+             [misc :refer [response-for]]
+             [transport :as transport]]
+            [org.httpkit.client :as http]
+            [refactor-nrepl.externs :refer [add-dependencies]])
+  (:import java.util.Date))