On Tue, Dec 12, 2017 at 4:49 PM Stefan Monnier <
address@hidden> wrote:
I tend to think of Hydra as "bindings that stick around" (to take the
wording on the first line of hydra.el), rather than "ways to show
available bindings of the current submap". So, yes, I think it does
something else (something more)
Well, that's correct ..
than what I understand you want.
Though I now think I did a very bad job at constructing that problem statement. But I know for sure that hydra.el fits the bill perfectly (I've been using it ever since Oleh released it).
Integrating hydra into emacs with help package developers do these:
- Create interfaces for transitional keymaps
- The bindings could be sticky or not (can be configured in hydra)
- Allow customizing the descriptions of the bindings (@JWiegley as you later suggest which-key, which-key does not allow that.. well it does.. but the user will need to tweak the description, etc.. I see which-end more as a tool only for the end-user. hydra can be used both by package developers and end users).
- Pick and choose which bindings to "show" in that interface.. you don't have to show all. The package developer may choose to have duplicate bindings for some function in that keymap, but prefer to show only the preferred binding in the hydra popup (cannot do that in which-key.. it shows *everything*).
And, BTW, if I take a hydra like
(defhydra hydra-zoom (global-map "<f6>")
"zoom"
("g" text-scale-increase "in")
("l" text-scale-decrease "out"))
and I press `f6` I don't get any help in the echo area (nor in the "lv"
area). I only get that help after pressing `f6 g` or `f6 l`, so I need
some other mechanism to find those "initial" key bindings.
(defhydra hydra-zoom ()
"zoom"
("g" text-scale-increase "in")
("l" text-scale-decrease "out"))
(global-set-key (kbd "C-c") 'hydra-zoom/body)
In Style 1, you allow the hydra to share the "keymap space" with other bindings not related to that hydra.
In Style 2, the hydra takes over the whole "keymap space". In above Style 2 example, the "C-c" space is completely ruled by the hydra-zoom hydra.
So in this respect, I think it does something less than what
I understand you'd want.
I can see something like this begin added to smerge.el if and when hydra.el gets merged to the core (See the use of :pre and :post):
(defhydra hydra-smerge (:color pink
:hint nil
:pre (smerge-mode 1)
;; Disable `smerge-mode' when quitting hydra if
;; no merge conflicts remain.
:post (smerge-auto-leave))
"
^Move^ ^Keep^ ^Diff^ ^Other^
^^-----------^^-------------------^^---------------------^^-------
_n_ext _b_ase _<_: upper/base _C_ombine
_p_rev _u_pper _=_: upper/lower _r_esolve
^^ _l_ower _>_: base/lower _k_ill current
^^ _a_ll _R_efine
^^ _RET_: current _E_diff
"
("n" smerge-next)
("p" smerge-prev)
("b" smerge-keep-base)
("u" smerge-keep-upper)
("l" smerge-keep-lower)
("a" smerge-keep-all)
("RET" smerge-keep-current)
("\C-m" smerge-keep-current)
("<" smerge-diff-base-upper)
("=" smerge-diff-upper-lower)
(">" smerge-diff-base-lower)
("R" smerge-refine)
("E" smerge-ediff)
("C" smerge-combine-with-next)
("r" smerge-resolve)
("k" smerge-kill-current)
("q" nil "cancel" :color blue))
> I quickly went though hydra.el.. isn't defhydra mainly what it is? What
> would you suggest splitting out of that library?
I don't know enough about it to have a clear opinion on that.
OK.
Thanks.