Fix docstring rendering when keymap references have their own line

Previously, we'd render "\\<foo-map>\n" as "\n", leading to an
unwanted blank line in the output. See `org-capture` (on MELPA) for an
example.

3 files changed, 15 insertions, 2 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6a65421..b2d4866 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 # v0.17 (unreleased)
 
-No changes yet.
+Fixed a minor docstring formatting issue when keymap references were
+on their own line.
 
 # v0.16
 
diff --git a/helpful.el b/helpful.el
index 171b84b..05239f0 100644
--- a/helpful.el
+++ b/helpful.el
@@ -972,7 +972,8 @@ unescaping too."
           (forward-char 1))
          ((looking-at
            ;; Text of the form \\<foo-keymap>
-           (rx "\\<" (group (+ (not (in ">")))) ">"))
+           (rx "\\<" (group (+ (not (in ">")))) ">"
+               (? "\n")))
           (let* ((symbol-with-parens (match-string 0))
                  (symbol-name (match-string 1)))
             ;; Remove the original string.
diff --git a/test/helpful-unit-test.el b/test/helpful-unit-test.el
index 0e660bb..b2653e4 100644
--- a/test/helpful-unit-test.el
+++ b/test/helpful-unit-test.el
@@ -75,6 +75,17 @@
     (should
      (string-equal formatted-docstring "M-n"))))
 
+(ert-deftest helpful--docstring-keymap-newline ()
+  "If a keymap reference is on its own line, remove the entire line."
+  (should
+   (string-equal
+    (helpful--format-docstring "Foo.
+\\<minibuffer-local-map>
+bar")
+    "Foo.
+
+bar")))
+
 (ert-deftest helpful--docstring-advice ()
   "Get the docstring on advised functions."
   (should