fix #454 by allowing - to be variadic

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Changes
 
 * 2.4.next in progress
+  * Fix [#454](https://github.com/seancorfield/honeysql/issues/454) by allowing `-` to be variadic.
   * Address [#452](https://github.com/seancorfield/honeysql/pull/452) by adding `:replace-into` to the core SQL supported, instead of just for the MySQL and SQLite dialects (so the latter is not needed yet).
   * Address [#451](https://github.com/seancorfield/honeysql/issues/451) by adding a test for it, showing how `:nest` produces the desired result.
   * Address [#447](https://github.com/seancorfield/honeysql/issues/447) by updating GitHub Actions and dependencies.

src/honey/sql.cljc

@@ -1279,7 +1279,7 @@
       (atom)))
 
 (def ^:private op-ignore-nil (atom #{:and :or}))
-(def ^:private op-variadic   (atom #{:and :or :+ :* :|| :&&}))
+(def ^:private op-variadic   (atom #{:and :or :+ :* :- :|| :&&}))
 
 (defn- unwrap [x opts]
   (if-let [m (meta x)]

test/honey/ops_test.cljc

@@ -0,0 +1,12 @@
+;; copyright (c) 2023 sean corfield, all rights reserved
+
+(ns honey.ops-test
+  (:refer-clojure :exclude [format])
+  (:require [clojure.test :refer [deftest is]]
+            [honey.sql :as sut]
+            [honey.sql :as sql]))
+
+(deftest issue-454
+  (is (= ["SELECT a - b - c AS x"]
+         (-> {:select [[[:- :a :b :c] :x]]}
+             (sql/format)))))