bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[N. Jackson]

With Hydra Version 0.14.0 from GNU Elpa, the first example hydra
(given in the readme and in the commentary at the beginning of
hydra.el) does not work. I am on Emacs 25.2.

Steps (with the Hydra package from GNU Elpa installed by the Emacs
package manager):

0. $ emacs -Q

1. M-x package-initialize RET

2. In *scratch* type the example code from the readme:

(defhydra hydra-zoom (global-map "<f2>")
  "zoom"
  ("g" text-scale-increase "in")
  ("l" text-scale-decrease "out"))

3. C-x C-e to evaluate it

4. Hit F2 to run it

Expected behaviour:

A prompt is displayed listing `g' and `l' as possible keys;
pressing 'g' or `l' changes the font size; pressing any other key
exits the hydra.

Observed behaviour:

No prompt is displayed. Only "f2-" is displayed in the echo area.
Pressing `g' or `l' changes font size as expected and _after_
pressing either `g' or `l' at least once, a hydra prompt is
displayed and subsequently pressing any other key exits the hydra
as expected. However, if a key other than `g' of `l' is pressed
before either `g' or `l' is pressed an error message is displayed.
E.g. pressing `n' produces

  <f2> n is undefined

After the error message is printed, text typed in the buffer at
point is coloured red. [Presumably text properties or an overlay
that was meant to go in the minibuffer were applied at point.]


In GNU Emacs 25.2.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.22.11)
 of 2017-04-26 built on moondust.localdomain
Windowing system distributor 'Fedora Project', version 11.0.11903000
System Description:	Fedora release 25 (Twenty Five)

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GSETTINGS NOTIFY ACL
LIBSELINUX GNUTLS LIBXML2 FREETYPE LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11

Important settings:
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  value of $XMODIFIERS: @im=none
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Major mode: Message

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org-compat org-macs org-loaddefs format-spec find-func bbdb-anniv
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mailabbrev bbdb bbdb-site timezone bbdb-loaddefs finder-inf tex-site
info package epg-config ido seq byte-opt gv bytecomp byte-compile
cl-extra help-mode cconv edmacro kmacro recentf tree-widget wid-edit
easymenu battery time wheatgrass-theme paren savehist saveplace
elec-pair desktop frameset cl-loaddefs pcase cl-lib delsel cua-base
cus-start cus-load time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 1233948 100493)
 (symbols 48 113329 0)
 (miscs 40 23947 7431)
 (strings 32 242449 21516)
 (string-bytes 1 8618786)
 (vectors 16 74342)
 (vector-slots 8 2095441 85496)
 (floats 8 931 1443)
 (intervals 56 98882 0)
 (buffers 976 164))

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[Oleh Krehel]

Can't reproduce with:

1. Remove ~/.emacs.d/elpa/hydra
2. Start emacs-25.2 -Q
3. Install hydra
4. Paste the code you mentioned.

Everything still works.

regards,
Oleh

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[Michael Heerdegen]

Oleh Krehel <ohwoeowho@gmail.com> writes:

> Can't reproduce with:
>
> 1. Remove ~/.emacs.d/elpa/hydra
> 2. Start emacs-25.2 -Q
> 3. Install hydra
> 4. Paste the code you mentioned.
>
> Everything still works.

I see exactly the same as the OP.  Also with Emacs 24 btw.  I didn't
reinstall or something like that, I just loaded the files from emacs -Q.


Michael.

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[N. Jackson]

At 21:57 +0200 on Friday 2017-09-22, Michael Heerdegen wrote:
>
> I see exactly the same as the OP.  Also with Emacs 24 btw.

I see the problem with

  24.4
  24.5
  25.2
  25.3
  Master (3a09343eabaa751e7d40f0a21af5c63427d9a850)

(I didn't test 25.1.), however the problem is subtly different in
24.4 and 24.5 -- after trying to run the hydra and entering an
undefined key, text at point in the initial buffer is not coloured
red.

N.

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[Oleh Krehel]

Please try to reproduce with my steps (especially emacs -Q and
remove/reinstall). There's likely no reason for this code to stop
working other than byte-compilation or config bug: it's worked fine
for 2 months without anyone else complaining.

If I can't reproduce it on my side, I can't do much.

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[Michael Heerdegen]

Oleh Krehel <ohwoeowho@gmail.com> writes:

> Please try to reproduce with my steps (especially emacs -Q and
> remove/reinstall). There's likely no reason for this code to stop
> working other than byte-compilation or config bug: it's worked fine
> for 2 months without anyone else complaining.

I reproduced this with a newly created user on my Debian computer where
I installed hydra from Gnu Elpa, loaded the files, and tried the recipe.

As far as I understand the definition of `defhydra', the example won't
do what the OP expects unless you additionally eval

  (global-set-key [f2] 'hydra-zoom/body)

Without that, the hydra hinting kicks in only after you have hit another
hydra key after hitting the prefix key.


Michael.

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[N. Jackson]

At 18:19 +0200 on Saturday 2017-09-23, Michael Heerdegen wrote:
>
> As far as I understand the definition of `defhydra', the example won't
> do what the OP expects unless you additionally eval
>
>   (global-set-key [f2] 'hydra-zoom/body)
>
> Without that, the hydra hinting kicks in only after you have hit another
> hydra key after hitting the prefix key.

Indeed. When I asked about this on the Emacs Help list a few days
ago, Marcin Borkowski pointed that out, and indeed, as I mentioned
there, following this suggestion I tried:

  (defhydra hydra-zoom ()
    "zoom"
    ("g" text-scale-increase "in")
    ("l" text-scale-decrease "out"))

  (global-set-key (kbd "<f2>") 'hydra-zoom/body)

and this does work just fine. :)

Sorry. I should have mentioned that in this bug report.

So this bug report is about the

  (defhydra hydra-zoom (global-map "<f2>") ... )

form not working and/or about the doc where this is used as the
first example.

N.

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[N. Jackson]

At 17:54 +0200 on Friday 2017-09-22, Oleh Krehel wrote:
>
> 1. Remove ~/.emacs.d/elpa/hydra
> 2. Start emacs-25.2 -Q
> 3. Install hydra
> 4. Paste the code you mentioned.

At 14:56 +0200 on Saturday 2017-09-23, Oleh Krehel wrote:
>
> Please try to reproduce with my steps (especially emacs -Q and
> remove/reinstall). There's likely no reason for this code to
> stop working other than byte-compilation or config bug: it's
> worked fine for 2 months without anyone else complaining.

Hello Oleh,

Thanks for responding.

I just tried your steps above, but the problem persists.

1. I checked my ~/.emacs.d/elpa/ directory and saw there the hydra
package in ~/.emacs.d/elpa//hydra-0.14.0.

2. I went into the Emacs package manager and deleted the hydra
package.

3. I exited Emacs.

4. I checked my ~/.emacs.d/elpa/ directory and the hydra-0.14.0
directory was gone.

5. I ran Emacs -Q.

6. M-x list-packages RET

7. I went to the hydra package in the list and marked it for
installation. Then I issued the `x' command to install it.

8. I pasted the hydra body into the scratch buffer:

  (defhydra hydra-zoom (global-map "<f2>")
    "zoom"
    ("g" text-scale-increase "in")
    ("l" text-scale-decrease "out"))

9. I did C-x C-e to evaluate it.

10. I hit F2 to run it.

I got the same results as reported in my OP.

And, again, (as mentioned in my previous post) running

  (defhydra hydra-zoom ()
    "zoom"
    ("g" text-scale-increase "in")
    ("l" text-scale-decrease "out"))

  (global-set-key (kbd "<f2>") 'hydra-zoom/body)

here instead, works fine.

> If I can't reproduce it on my side, I can't do much.

No, that is perplexing.

Is the fact that the overlay (or text properties or whatever it
is) that is supposed to colour some of the letters red in the
hydra prompt actually gets applied at point in the *scratch*
buffer a clue?

N.

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[Noam Postavsky]

nljlistbox2@gmail.com (N. Jackson) writes:

> At 17:54 +0200 on Friday 2017-09-22, Oleh Krehel wrote:
>>
>> 1. Remove ~/.emacs.d/elpa/hydra
>> 2. Start emacs-25.2 -Q
>> 3. Install hydra
>> 4. Paste the code you mentioned.
>>
>> Everything still works.
>
> At 14:56 +0200 on Saturday 2017-09-23, Oleh Krehel wrote:
>>
>> Please try to reproduce with my steps (especially emacs -Q and
>> remove/reinstall). There's likely no reason for this code to
>> stop working other than byte-compilation or config bug: it's
>> worked fine for 2 months without anyone else complaining.

> 10. I hit F2 to run it.
>
> I got the same results as reported in my OP.
>
> And, again, (as mentioned in my previous post) running
>
>   (defhydra hydra-zoom ()
>     "zoom"
>     ("g" text-scale-increase "in")
>     ("l" text-scale-decrease "out"))
>
>   (global-set-key (kbd "<f2>") 'hydra-zoom/body)
>
> here instead, works fine.

Same here.  I can't see how it could operate differently, so I'm
wondering if this is just confusion of expectations.

Oleh, when you say "everything works", do you mean everything listed in
the README?  The thing the OP is saying doesn't work is not mentioned in
the docs, e.g., it says

    - Start zooming in with <f2> g

It never says "hit <f2> and *immediately* get prompted".

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[Oleh Krehel]

> It never says "hit <f2> and *immediately* get prompted".

Yes, exactly. The two options of binding, either taking up just the
keys the heads need, or the whole prefix are mentioned in the README,
with examples. Patches welcome if it's still not clear.

regards,
Oleh

bug#28550: 25.2; Hydra: First example hydra in the docs doesn't work

[Noam Postavsky]

tags 28550 notabug
close 28550
quit

Oleh Krehel <ohwoeowho@gmail.com> writes:

>> It never says "hit <f2> and *immediately* get prompted".
>
> Yes, exactly. The two options of binding, either taking up just the
> keys the heads need, or the whole prefix are mentioned in the README,
> with examples. Patches welcome if it's still not clear.

Hmm, nothing more from OP, the doc does describe correct behaviour, I'm
just gonna close.