Render keyboard maros in keymap pretty view

Fixes #202

3 files changed, 27 insertions, 7 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 26236f5..1501875 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,8 @@ are now rendered as hooks.
 String literals are now rendered correctly in docstrings. Previously
 command substitution applied inside literals.
 
+Fixed a crash on keyboard macros in keymaps.
+
 # v0.16
 
 Improved wording when looking at aliases.
diff --git a/helpful.el b/helpful.el
index 4aac2aa..a88031a 100644
--- a/helpful.el
+++ b/helpful.el
@@ -840,7 +840,10 @@ vector suitable for `key-description', and COMMAND is a smbol."
    ;; so this is a command we can call.
    ((or
      (symbolp keymap)
-     (functionp keymap))
+     (functionp keymap)
+     ;; Strings or vectors mean a keyboard macro.
+     (stringp keymap)
+     (vectorp keymap))
     `(([] ,keymap)))
    ((stringp (car keymap))
     (helpful--keymap-keys (cdr keymap)))
@@ -917,12 +920,16 @@ vector suitable for `key-description', and COMMAND is a smbol."
                          keys-and-commands))
          (formatted-commands
           (--map
-           (if (symbolp it)
-               (helpful--button
-                (symbol-name it)
-                'helpful-describe-button
-                'symbol it)
-             "#<anonymous-function>")
+           (cond
+            ((symbolp it)
+             (helpful--button
+              (symbol-name it)
+              'helpful-describe-button
+              'symbol it))
+            ((or (stringp it) (vectorp it))
+             "Keyboard Macro")
+            (t
+             "#<anonymous-function>"))
            commands))
          ;; Build lines for display.
          (lines
diff --git a/test/helpful-unit-test.el b/test/helpful-unit-test.el
index d4fd835..01e8067 100644
--- a/test/helpful-unit-test.el
+++ b/test/helpful-unit-test.el
@@ -620,6 +620,17 @@ associated a lambda with a keybinding."
     ;; Don't crash on anonymous functions in a keymap.
     (helpful--keymap-keys keymap)))
 
+(ert-deftest helpful--format-keymap--keyboard-macros ()
+  (let* ((keymap (make-keymap)))
+    ;; A keyboard macro can be a string or a vector.
+    (define-key keymap "a" "ABC")
+    (define-key keymap "b" [TAB])
+
+    (should
+     (equal
+      (helpful--format-keymap keymap)
+      "a  Keyboard Macro\nb  Keyboard Macro"))))
+
 (defun helpful--dummy-command ()
   (interactive))