bug#65468: 29.1; describe-theme fails to describe some themes not loaded

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Thierry Volpiatto]

This because `describe-theme-1` is not looping in buffer to find
`deftheme` definition.

Try (describe-theme 'leuven) to reproduce (if not already loaded of course).

This patch fixes it:

diff --git a/lisp/cus-theme.el b/lisp/cus-theme.el
index 5d3f2585976..3640d1ec329 100644
--- a/lisp/cus-theme.el
+++ b/lisp/cus-theme.el
@@ -513,13 +513,15 @@ It includes all faces in list FACES."
       ;; Attempt to grab the theme documentation
       (when fn
 	(with-temp-buffer
-	  (insert-file-contents fn)
-	  (let ((sexp (let ((read-circle nil))
-			(condition-case nil
-			    (read (current-buffer))
-			  (end-of-file nil)))))
-            (and (eq (car-safe sexp) 'deftheme)
-		 (setq doc (nth 2 sexp)))))))
+          (insert-file-contents fn)
+          (catch 'found
+            (let (sexp)
+              (while (setq sexp (let ((read-circle nil))
+	                          (condition-case nil
+		                      (read (current-buffer))
+		                    (end-of-file nil))))
+                (when (eq (car-safe sexp) 'deftheme)
+	          (throw 'found (setq doc (nth 2 sexp))))))))))
     (princ "\n\nDocumentation:\n")
     (princ (if (stringp doc)
 	       (substitute-command-keys doc)

However for the modus themes it will fail as well because deftheme is
nested inside a eval-when-compile.

And while I am at it, the docstring of Leuven-dark is wrong (guess it has
been copy/pasted from Leuven without modifications).


In GNU Emacs 29.1 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
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-- 
Thierry

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Mauro Aranda]

Thierry Volpiatto <thievol@posteo.net> writes:

 > This because `describe-theme-1` is not looping in buffer to find
 > `deftheme` definition.

It is a convention that the first form should be a call to deftheme.
But it seems built-in themes have deviated from that convention.  And
other themes might as well, I don't know.

 >
 > Try (describe-theme 'leuven) to reproduce (if not already loaded of 
course).
 >

At least for the leuven themes, it should be easy to make them follow
the convention.

 > This patch fixes it:
 >
 > diff --git a/lisp/cus-theme.el b/lisp/cus-theme.el
 > index 5d3f2585976..3640d1ec329 100644
 > --- a/lisp/cus-theme.el
 > +++ b/lisp/cus-theme.el
 > @@ -513,13 +513,15 @@ It includes all faces in list FACES."
 >        ;; Attempt to grab the theme documentation
 >        (when fn
 >  	(with-temp-buffer
 > -	  (insert-file-contents fn)
 > -	  (let ((sexp (let ((read-circle nil))
 > -			(condition-case nil
 > -			    (read (current-buffer))
 > -			  (end-of-file nil)))))
 > -            (and (eq (car-safe sexp) 'deftheme)
 > -		 (setq doc (nth 2 sexp)))))))
 > +          (insert-file-contents fn)
 > +          (catch 'found
 > +            (let (sexp)
 > +              (while (setq sexp (let ((read-circle nil))
 > +	                          (condition-case nil
 > +		                      (read (current-buffer))
 > +		                    (end-of-file nil))))
 > +                (when (eq (car-safe sexp) 'deftheme)
 > +	          (throw 'found (setq doc (nth 2 sexp))))))))))
 >      (princ "\n\nDocumentation:\n")
 >      (princ (if (stringp doc)
 >  	       (substitute-command-keys doc)
 >
 > However for the modus themes it will fail as well because deftheme is
 > nested inside a eval-when-compile.

I feel like if there are more themes that suffer from this problem,
they could solve it by following the convention.  And for other themes,
it seems like either way we have to give it more thought, because AFAICS
following the convention is more difficult and the patch doesn't solve
it either.

 > And while I am at it, the docstring of Leuven-dark is wrong (guess it has
 > been copy/pasted from Leuven without modifications).

This has been fixed already, thanks.

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Thierry Volpiatto]

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Mauro Aranda <maurooaranda@gmail.com> writes:

> Thierry Volpiatto <thievol@posteo.net> writes:
>
>> This because `describe-theme-1` is not looping in buffer to find
>> `deftheme` definition.
>
> It is a convention that the first form should be a call to deftheme.
> But it seems built-in themes have deviated from that convention.  And
> other themes might as well, I don't know.

Maybe.

>>
>> Try (describe-theme 'leuven) to reproduce (if not already loaded of
>   course).
>>
>
> At least for the leuven themes, it should be easy to make them follow
> the convention.

Yes.

>> This patch fixes it:
>>
>> diff --git a/lisp/cus-theme.el b/lisp/cus-theme.el
>> index 5d3f2585976..3640d1ec329 100644
>> --- a/lisp/cus-theme.el
>> +++ b/lisp/cus-theme.el
>> @@ -513,13 +513,15 @@ It includes all faces in list FACES."
>>        ;; Attempt to grab the theme documentation
>>        (when fn
>>  	(with-temp-buffer
>> -	  (insert-file-contents fn)
>> -	  (let ((sexp (let ((read-circle nil))
>> -			(condition-case nil
>> -			    (read (current-buffer))
>> -			  (end-of-file nil)))))
>> -            (and (eq (car-safe sexp) 'deftheme)
>> -		 (setq doc (nth 2 sexp)))))))
>> +          (insert-file-contents fn)
>> +          (catch 'found
>> +            (let (sexp)
>> +              (while (setq sexp (let ((read-circle nil))
>> +	                          (condition-case nil
>> +		                      (read (current-buffer))
>> +		                    (end-of-file nil))))
>> +                (when (eq (car-safe sexp) 'deftheme)
>> +	          (throw 'found (setq doc (nth 2 sexp))))))))))
>>      (princ "\n\nDocumentation:\n")
>>      (princ (if (stringp doc)
>>  	       (substitute-command-keys doc)
>>
>> However for the modus themes it will fail as well because deftheme is
>> nested inside a eval-when-compile.
>
> I feel like if there are more themes that suffer from this problem,
> they could solve it by following the convention.

For the themes that are in Emacs, should be easy to fix.

> And for other themes, it seems like either way we have to give it more
> thought, because AFAICS following the convention is more difficult and
> the patch doesn't solve it either.

It seems the themes installed from package are already loaded, not sure
if it is true for all of them though.

For what is `describe-theme-1` patch is is always better to cover more
use cases even if not all cases are covered (e.g. modus themes), however
having a new function that fetch documentation from file would be great
and reusable elsewhere (I have here - in helm - to write my own function to get the
first line documentation of a theme).

>
>> And while I am at it, the docstring of Leuven-dark is wrong (guess it has
>> been copy/pasted from Leuven without modifications).
>
> This has been fixed already, thanks.

Good, thanks.

-- 
Thierry

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bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Eli Zaretskii]

> From: Thierry Volpiatto <thievol@posteo.net>
> Date: Wed, 23 Aug 2023 08:44:16 +0000
> 
> 
> This because `describe-theme-1` is not looping in buffer to find
> `deftheme` definition.

We never did better, did we?  IOW, this issue exists for a long time,
right?

If so, I think this should go to master, not to the emacs-29 branch.

Thanks.

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Eli Zaretskii]

> Cc: 65468@debbugs.gnu.org
> Date: Wed, 23 Aug 2023 06:53:03 -0300
> From: Mauro Aranda <maurooaranda@gmail.com>
> 
> Thierry Volpiatto <thievol@posteo.net> writes:
> 
>  > This because `describe-theme-1` is not looping in buffer to find
>  > `deftheme` definition.
> 
> It is a convention that the first form should be a call to deftheme.
> But it seems built-in themes have deviated from that convention.  And
> other themes might as well, I don't know.
> 
>  >
>  > Try (describe-theme 'leuven) to reproduce (if not already loaded of 
> course).
>  >
> 
> At least for the leuven themes, it should be easy to make them follow
> the convention.

I think we should indeed fix the themes that come with Emacs.

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Thierry Volpiatto]

[-- Attachment #1: Type: text/plain, Size: 2654 bytes --]


Eli Zaretskii <eliz@gnu.org> writes:

>> From: Thierry Volpiatto <thievol@posteo.net>
>> Date: Wed, 23 Aug 2023 08:44:16 +0000
>> 
>> 
>> This because `describe-theme-1` is not looping in buffer to find
>> `deftheme` definition.
>
> We never did better, did we?  IOW, this issue exists for a long time,
> right?
>
> If so, I think this should go to master, not to the emacs-29 branch.

I will not push anything, just proposing patch if any interest to fix
this issue, here a new patch that provide a separate function for this
part of code:

diff --git a/lisp/cus-theme.el b/lisp/cus-theme.el
index 5d3f2585976..c6c9d9c892b 100644
--- a/lisp/cus-theme.el
+++ b/lisp/cus-theme.el
@@ -490,6 +490,29 @@ It includes all faces in list FACES."
     (with-current-buffer standard-output
       (describe-theme-1 theme))))
 
+(defun describe-theme-from-file (&optional file short)
+  "Describe theme from its file FILE without loading it.
+
+If FILE is nil try to find the file from the theme name in
+`custom-theme-load-path'.
+If SHORT is non nil show only the first line of documentation."
+    (let ((file (or file
+                  (locate-file (concat (symbol-name theme) "-theme.el")
+			       (custom-theme--load-path)
+			       '("" "c")))))
+      (with-temp-buffer
+        (insert-file-contents file)
+        (catch 'found
+          (let (sexp)
+            (while (setq sexp (let ((read-circle nil))
+	                        (condition-case nil
+		                    (read (current-buffer))
+		                  (end-of-file nil))))
+              (when (eq (car-safe sexp) 'deftheme)
+	        (throw 'found (if short
+                                  (car (split-string (nth 2 sexp) "\n"))
+                                (nth 2 sexp))))))))))
+
 (defun describe-theme-1 (theme)
   (prin1 theme)
   (princ " is a custom theme")
@@ -510,16 +533,9 @@ It includes all faces in list FACES."
 	    (princ "It is loaded but disabled."))
 	  (setq doc (get theme 'theme-documentation)))
       (princ "It is not loaded.")
-      ;; Attempt to grab the theme documentation
+      ;; Attempt to grab the theme documentation from file.
       (when fn
-	(with-temp-buffer
-	  (insert-file-contents fn)
-	  (let ((sexp (let ((read-circle nil))
-			(condition-case nil
-			    (read (current-buffer))
-			  (end-of-file nil)))))
-            (and (eq (car-safe sexp) 'deftheme)
-		 (setq doc (nth 2 sexp)))))))
+	(setq doc (describe-theme-from-file fn))))
     (princ "\n\nDocumentation:\n")
     (princ (if (stringp doc)
 	       (substitute-command-keys doc)

-- 
Thierry

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bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Mauro Aranda]

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Eli Zaretskii <eliz@gnu.org> writes:

 >> Cc: 65468@debbugs.gnu.org
 >> Date: Wed, 23 Aug 2023 06:53:03 -0300
 >> From: Mauro Aranda <maurooaranda@gmail.com>
 >>
 >> Thierry Volpiatto <thievol@posteo.net> writes:
 >>
 >>  > This because `describe-theme-1` is not looping in buffer to find
 >>  > `deftheme` definition.
 >>
 >> It is a convention that the first form should be a call to deftheme.
 >> But it seems built-in themes have deviated from that convention.  And
 >> other themes might as well, I don't know.
 >>
 >>  >
 >>  > Try (describe-theme 'leuven) to reproduce (if not already loaded of
 >> course).
 >>  >
 >>
 >> At least for the leuven themes, it should be easy to make them follow
 >> the convention.
 >
 > I think we should indeed fix the themes that come with Emacs.

Here's a patch for the leuven themes.  And I'm CCing Prot so he can take
a look to adjust the modus-themes.

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From ab417284f27d172cc95f4c735f28bdfd6366817b Mon Sep 17 00:00:00 2001
From: Mauro Aranda <maurooaranda@gmail.com>
Date: Thu, 24 Aug 2023 07:12:41 -0300
Subject: [PATCH] Adjust built-in themes to convention (Bug#65468)

* etc/themes/leuven-dark-theme.el
* etc/themes/leuven-theme.el: Make the deftheme call the first form.
---
 etc/themes/leuven-dark-theme.el | 20 ++++++++++----------
 etc/themes/leuven-theme.el      | 20 ++++++++++----------
 2 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/etc/themes/leuven-dark-theme.el b/etc/themes/leuven-dark-theme.el
index 33a15945e71..a2445896ea6 100644
--- a/etc/themes/leuven-dark-theme.el
+++ b/etc/themes/leuven-dark-theme.el
@@ -39,6 +39,16 @@
 
 ;;; Code:
 
+;;;###theme-autoload
+(deftheme leuven-dark
+  "Face colors with a dark background.
+Basic, Font Lock, Isearch, Gnus, Message, Org mode, Diff, Ediff,
+Flyspell, Semantic, and Ansi-Color faces are included -- and much
+more..."
+  :background-mode 'dark
+  :family 'leuven
+  :kind 'color-scheme)
+
 ;;; Options.
 
 (defgroup leuven-dark nil
@@ -93,16 +103,6 @@ leuven-dark-scale-font
 
 ;;; Theme Faces.
 
-;;;###theme-autoload
-(deftheme leuven-dark
-  "Face colors with a dark background.
-Basic, Font Lock, Isearch, Gnus, Message, Org mode, Diff, Ediff,
-Flyspell, Semantic, and Ansi-Color faces are included -- and much
-more..."
-  :background-mode 'dark
-  :family 'leuven
-  :kind 'color-scheme)
-
 (let ((class '((class color) (min-colors 89)))
 
       ;; Leuven generic colors.
diff --git a/etc/themes/leuven-theme.el b/etc/themes/leuven-theme.el
index f7d454381d7..3d8d0d49b36 100644
--- a/etc/themes/leuven-theme.el
+++ b/etc/themes/leuven-theme.el
@@ -38,6 +38,16 @@
 
 ;;; Code:
 
+;;;###theme-autoload
+(deftheme leuven
+  "Face colors with a light background.
+Basic, Font Lock, Isearch, Gnus, Message, Org mode, Diff, Ediff,
+Flyspell, Semantic, and Ansi-Color faces are included -- and much
+more..."
+  :background-mode 'light
+  :kind 'color-scheme
+  :family 'leuven)
+
 ;;; Options.
 
 (defgroup leuven nil
@@ -74,16 +84,6 @@ leuven-scale-font
 
 ;;; Theme Faces.
 
-;;;###theme-autoload
-(deftheme leuven
-  "Face colors with a light background.
-Basic, Font Lock, Isearch, Gnus, Message, Org mode, Diff, Ediff,
-Flyspell, Semantic, and Ansi-Color faces are included -- and much
-more..."
-  :background-mode 'light
-  :kind 'color-scheme
-  :family 'leuven)
-
 (let ((class '((class color) (min-colors 89)))
 
       ;; Leuven generic colors.
-- 
2.34.1

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Protesilaos Stavrou]

> From: Mauro Aranda <maurooaranda@gmail.com>
> Date: Thu, 24 Aug 2023 07:16:10 -0300

> [... 26 lines elided]

> Here's a patch for the leuven themes.  And I'm CCing Prot so he can take
> a look to adjust the modus-themes.

> [... 88 lines elided]

Thank you Mauro!  I just made the changes on my end, though not directly
on emacs.git.  I will prepare a new version of the themes as soon as
possible and sync that.  Hopefully this week.

-- 
Protesilaos Stavrou
https://protesilaos.com

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Eli Zaretskii]

> From: Thierry Volpiatto <thievol@posteo.net>
> Cc: 65468@debbugs.gnu.org
> Date: Wed, 23 Aug 2023 13:12:28 +0000
> 
> > If so, I think this should go to master, not to the emacs-29 branch.
> 
> I will not push anything, just proposing patch if any interest to fix
> this issue, here a new patch that provide a separate function for this
> part of code:

Thanks, installed on master (after fixing a small blunder).

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Thierry Volpiatto]

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Eli Zaretskii <eliz@gnu.org> writes:

>> From: Thierry Volpiatto <thievol@posteo.net>
>> Cc: 65468@debbugs.gnu.org
>> Date: Wed, 23 Aug 2023 13:12:28 +0000
>> 
>> > If so, I think this should go to master, not to the emacs-29 branch.
>> 
>> I will not push anything, just proposing patch if any interest to fix
>> this issue, here a new patch that provide a separate function for this
>> part of code:
>
> Thanks, installed on master (after fixing a small blunder).

I see, thanks.

-- 
Thierry

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bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Mauro Aranda]

On 26/8/23 04:57, Eli Zaretskii wrote:
>> From: Thierry Volpiatto <thievol@posteo.net>
>> Cc: 65468@debbugs.gnu.org
>> Date: Wed, 23 Aug 2023 13:12:28 +0000
>>
>>> If so, I think this should go to master, not to the emacs-29 branch.
>>
>> I will not push anything, just proposing patch if any interest to fix
>> this issue, here a new patch that provide a separate function for this
>> part of code:
> 
> Thanks, installed on master (after fixing a small blunder).
> 

It seems to me that there's nothing left to do here.  The patch by
Thierry got installed, I fixed the leuven themes and Prot reported that
he fixed the modus-themes on his end.

Can we close it? Or did I miss something?

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Eli Zaretskii]

> Date: Sat, 9 Sep 2023 08:33:27 -0300
> Cc: 65468@debbugs.gnu.org
> From: Mauro Aranda <maurooaranda@gmail.com>
> 
> On 26/8/23 04:57, Eli Zaretskii wrote:
> >> From: Thierry Volpiatto <thievol@posteo.net>
> >> Cc: 65468@debbugs.gnu.org
> >> Date: Wed, 23 Aug 2023 13:12:28 +0000
> >>
> >>> If so, I think this should go to master, not to the emacs-29 branch.
> >>
> >> I will not push anything, just proposing patch if any interest to fix
> >> this issue, here a new patch that provide a separate function for this
> >> part of code:
> > 
> > Thanks, installed on master (after fixing a small blunder).
> > 
> 
> It seems to me that there's nothing left to do here.  The patch by
> Thierry got installed, I fixed the leuven themes and Prot reported that
> he fixed the modus-themes on his end.
> 
> Can we close it? Or did I miss something?

Fine by me.  Stefan?

bug#65468: 29.1; describe-theme fails to describe some themes not loaded

[Stefan Kangas]

Mauro Aranda <maurooaranda@gmail.com> writes:

> It seems to me that there's nothing left to do here.  The patch by
> Thierry got installed, I fixed the leuven themes and Prot reported that
> he fixed the modus-themes on his end.

OK, let's close it.