Empty string in the hydra docstring returns error

[sewkokot]

Why evaluating the following code gives an error? In some cases there is no need for redundant docstring when e.g. :column "docstring1" is provided. Also as a work-around I could set " " as the docstring but still I have " :" (space + colon) in the minibuffer. I looked at the hydra.el code but could not figure out where the colon is hard-coded? What i can do in this situation?

(defhydra hydra-clock (:color blue)
  ""
  ("q" nil "quit" :column "Clock")
  ("c" org-clock-cancel "cancel" :color pink :column "Do")
  ("d" org-clock-display "display")
  ("e" org-clock-modify-effort-estimate "effort")
  ("i" org-clock-in "in")
  ("j" org-clock-goto "jump")
  ("o" org-clock-out "out")
  ("r" org-clock-report "report"))

Debugger entered--Lisp error: (args-out-of-range "" 0)
aref("" 0)
(eq 10 (aref docstring 0))
(if (eq 10 (aref docstring 0)) (list (quote concat) (cons (quote format) (cons (substring docstring 1) (nreverse varlist))) rest) (let ((r (list (quote replace-regexp-in-string) " +$" "" (list (quote concat) docstring ": " (list (quote replace-regexp-in-string) "\(%\)" "\1\1" rest))))) (if (stringp rest) (list (quote format) (eval r)) (list (quote format) r))))

[sewkokot]

I found where the colon after 'docstring' is hard-coded. The problem was that I have hydra package from melpa and local hydra from github. I removed the colon in hydra.el from local git, but hydra from melpa directory had been loaded first and the colon persisted. Anyway I left the colon as it is and now I use the newline as the docstring

(defhydra hydra-clock (:color blue)
  "
"
  ("q" nil "quit" :column "Exit")
  ("c" org-clock-cancel "cancel" :color pink :column "Clock")
...
  ("r" org-clock-report "report"))

I would be happy to see a new feature that if an empty string "" is used as docstring then the docstring in the minibuffer is omitted.

[abo-abo]

Thanks, your example should now work like this:

(defhydra hydra-clock (:color blue)
  ("q" nil "quit" :column "Clock")
  ("c" org-clock-cancel "cancel" :color pink :column "Do")
  ("d" org-clock-display "display")
  ("e" org-clock-modify-effort-estimate "effort")
  ("i" org-clock-in "in")
  ("j" org-clock-goto "jump")
  ("o" org-clock-out "out")
  ("r" org-clock-report "report"))

[sewkokot]

Thank you very much, it works as I expected!