Key binding in Julia minor mode

Question

I am unable to change key binding in a minor mode.

Initiation of minor mode:

(add-hook 'julia-mode-hook 'julia-repl-mode)

I tried a view variations for the key binding:

(add-hook 'julia-repl-mode
    (lambda ()
    (define-key map [C-shift-return] 'julia-repl-send-line)
    (define-key map [C-return] 'julia-repl-send-region-or-line)))

or:

(eval-after-load 'julia-repl '(define-key julia-repl-map [C-return]
                 'julia-repl-send-region-or-line))

But finally without result. I want to bind the command julia-repl-send-region-or-line to C-<eturn>. I was at least able to change it interactively with M-x local-set-key. But I would like to define it in my init file. What am I missing?

Answer 1

The variable map is undefined (aka free) here:

(add-hook 'julia-repl-mode
    (lambda ()
      (define-key map [C-shift-return] 'julia-repl-send-line)
      (define-key map [C-return] 'julia-repl-send-region-or-line)))

What keymap do you want to bind the keys in? Is it julia-mode-map? julia-repl-mode-map? You need to provide an actual keymap as the first argument of define-key.

Do you see an error or warning message in buffer *Messages* that mentions your unbound variable when your hook function is invoked? (The error might be ignored.)

(You can put (debug) as the first thing inside your lambda, and use d in the debugger to see what happens and understand the unbound variable problem, if it's not already clear from what I've said.)

Answer 2

I forgot to add a hook (solution):

(add-hook 'julia-repl-mode-hook
  (lambda ()
    (define-key julia-repl-mode-map [C-shift-return] 'julia-repl-send-line)
        (define-key julia-repl-mode-map [C-return] 'julia-repl-send-region-or-line)))

(add-hook 'julia-mode-hook 'julia-repl-mode)