[inspect] Add ability to sort maps by key

CHANGELOG.md

@@ -5,6 +5,7 @@
 - [#346](https://github.com/clojure-emacs/orchard/pull/346): Inspector: only show those datafied collection items that have unique datafy represantation.
 - [#348](https://github.com/clojure-emacs/orchard/pull/348): Inspector: display length of inspected strings.
 - [#348](https://github.com/clojure-emacs/orchard/pull/348): Inspector: display class flags.
+- [#349](https://github.com/clojure-emacs/orchard/pull/349): Inspector: add ability to sort maps by key.
 
 ## 0.35.0 (2025-05-28)
 

src/orchard/inspect.clj

@@ -46,6 +46,7 @@
    :max-nested-depth nil
    :display-analytics-hint nil
    :analytics-size-cutoff  100000
+   :sort-maps false
    :pretty-print false})
 
 (defn- reset-render-state [inspector]
@@ -100,11 +101,18 @@
 (defn- pagination-info
   "Calculate if the object should be paginated given the page size. Return a map
   with pagination info, or nil if object fits in a single page."
-  [{:keys [page-size current-page view-mode value] :as inspector}]
+  [{:keys [page-size current-page view-mode sort-maps value] :as inspector}]
   (let [page-size (if (= view-mode :hex)
                     (* page-size 16) ;; In hex view mode, each row is 16 bytes.
                     page-size)
         start-idx (* current-page page-size)
+        ;; Sort maps early to ensure proper paging.
+        sort-map? (and (= (object-type value) :map) sort-maps)
+        value (if sort-map?
+                (try (sort-by key value)
+                     ;; May throw if keys are not comparable.
+                     (catch Exception _ value))
+                value)
         ;; Try grab a chunk that is one element longer than asked in
         ;; page-size. This is how we know there are elements beyond the
         ;; current page.
@@ -114,18 +122,19 @@
         count+1 (count chunk+1)
         paginate? (or (> current-page 0) ;; In non-paginated it's always 0.
                       (> count+1 page-size))
+        chunk (cond-> chunk+1
+                (> count+1 page-size) pop)
         clength (or (counted-length inspector value)
                     (when (<= count+1 page-size)
                       (+ (* page-size current-page) count+1)))
         last-page (if clength
                     (quot (dec clength) page-size)
                     ;; Possibly infinite
                     Integer/MAX_VALUE)]
-    (when paginate?
-      {:chunk (cond-> chunk+1
-                (> count+1 page-size) pop)
-       :start-idx start-idx
-       :last-page last-page})))
+    (cond paginate? {:chunk chunk
+                     :start-idx start-idx
+                     :last-page last-page}
+          sort-map? {:chunk chunk})))
 
 (defn- decide-if-paginated
   "Make early decision if the inspected object should be paginated. If so,

test/orchard/inspect_test.clj

@@ -1736,6 +1736,41 @@
       (is+ [#"--- View mode" [:newline] "  ●normal object ●pretty"]
            (section rendered "View mode")))))
 
+(deftest sort-maps-test
+  (testing "with :sort-map-keys enabled, may keys are sorted"
+    (is+ (matchers/prefix
+          ["--- Contents:" [:newline]
+           "  " [:value "0" pos?] " = " [:value "0" pos?] [:newline]
+           "  " [:value "1" pos?] " = " [:value "1" pos?] [:newline]
+           "  " [:value "2" pos?] " = " [:value "2" pos?] [:newline]
+           "  " [:value "3" pos?] " = " [:value "3" pos?] [:newline]])
+         (-> (zipmap (range 100) (range 100))
+             inspect
+             (inspect/refresh {:sort-maps true})
+             render
+             contents-section)))
+
+  (testing "works if map is smaller than page size"
+    (is+ ["--- Contents:" [:newline]
+          "  " [:value "0" pos?] " = " [:value "0" pos?] [:newline]
+          "  " [:value "1" pos?] " = " [:value "1" pos?] [:newline]
+          "  " [:value "2" pos?] " = " [:value "2" pos?] [:newline]
+          "  " [:value "3" pos?] " = " [:value "3" pos?] [:newline]
+          "  " [:value "4" pos?] " = " [:value "4" pos?]]
+         (-> (zipmap (range 5) (range 5))
+             inspect
+             (inspect/refresh {:sort-maps true, :page-size 100})
+             render
+             contents-section)))
+
+  (testing "doesn't fail if keys are non-comparable"
+    (is+ (matchers/prefix ["--- Contents:"])
+         (-> {(byte-array 1) 1 (byte-array 2) 2}
+             inspect
+             (inspect/refresh {:sort-maps true})
+             render
+             contents-section))))
+
 (deftest tap-test
   (testing "tap-current-value"
     (let [proof (atom [])