Improve the optional translation of quotes

Fix several problems with the recently-added custom variable
help-quote-translation where the code would quote inconsistently
in help buffers.  Add support for quoting 'like this', which
is common in other GNU programs in ASCII environments.  Change
help-quote-translation to use more mnemonic values: values are now the
initial quoting char, e.g., (setq help-quote-translation ?`) gets the
traditional Emacs help-buffer quoting style `like this'.  Change the
default behavior of substitute-command-keys to match what's done in
set-locale-environment, i.e., quote ‘like this’ if displayable,
'like this' otherwise.
* doc/lispref/help.texi (Keys in Documentation): Document
new behavior of substitute-command-keys, and document
help-quote-translation.
* doc/lispref/tips.texi (Documentation Tips):
Mention the effect of help-quote-translation.
* etc/NEWS: Mention new behavior of substitute-command-keys,
and merge help-quote-translation news into it.
When talking about doc strings, mention new ways to type quotes.
* lisp/cedet/mode-local.el (overload-docstring-extension):
Revert my recent change to this function, which shouldn't be
needed as the result is a doc string.
* lisp/cedet/mode-local.el (mode-local-print-binding)
(mode-local-describe-bindings-2):
* lisp/cedet/srecode/srt-mode.el (srecode-macro-help):
* lisp/cus-theme.el (describe-theme-1):
* lisp/descr-text.el (describe-text-properties-1, describe-char):
* lisp/emacs-lisp/cl-generic.el (cl--generic-describe):
* lisp/emacs-lisp/eieio-opt.el (eieio-help-class)
(eieio-help-constructor):
* lisp/emacs-lisp/package.el (describe-package-1):
* lisp/faces.el (describe-face):
* lisp/help-fns.el (help-fns--key-bindings)
(help-fns--compiler-macro, help-fns--parent-mode)
(help-fns--obsolete, help-fns--interactive-only)
(describe-function-1, describe-variable):
* lisp/help.el (describe-mode):
Use substitute-command-keys to ensure a more-consistent quoting
style in help buffers.
* lisp/cus-start.el (standard):
Document new help-quote-translation behavior.
* lisp/emacs-lisp/lisp-mode.el (lisp-fdefs):
* lisp/help-mode.el (help-xref-symbol-regexp, help-xref-info-regexp)
(help-xref-url-regexp):
* lisp/international/mule-cmds.el (help-xref-mule-regexp-template):
* lisp/wid-edit.el (widget-documentation-link-regexp):
Also match 'foo', in case we're in a help buffer generated when
help-quote-translation is ?'.
* src/doc.c: Include disptab.h, for DISP_CHAR_VECTOR.
(LEFT_SINGLE_QUOTATION_MARK, uLSQM0, uLSQM1, uLSQM2, uRSQM0)
(uRSQM1, uRSQM2, LSQM, RSQM): New constants.
(Fsubstitute_command_keys): Document and implement new behavior.
(Vhelp_quote_translation): Document new behavior.

2 files changed, 11 insertions, 11 deletions

diff --git a/lisp/cedet/mode-local.el b/lisp/cedet/mode-local.el
index 35363337aee..3bdc3ea6155 100644
--- a/lisp/cedet/mode-local.el
+++ b/lisp/cedet/mode-local.el
@@ -598,16 +598,15 @@ PROMPT, INITIAL, HIST, and DEFAULT are the same as for `completing-read'."
 (defun overload-docstring-extension (overload)
   "Return the doc string that augments the description of OVERLOAD."
   (let ((doc "\n\This function can be overloaded\
- with ‘define-mode-local-override’.")
+ with `define-mode-local-override'.")
         (sym (overload-obsoleted-by overload)))
     (when sym
-      (setq doc (format "%s\nIt has made the overload ‘%s’ obsolete since %s."
+      (setq doc (format "%s\nIt has made the overload `%s' obsolete since %s."
                         doc sym (get sym 'overload-obsoleted-since))))
     (setq sym (overload-that-obsolete overload))
     (when sym
-      (setq doc (format
-                 "%s\nThis overload is obsolete since %s;\nuse ‘%s’ instead."
-                 doc (get overload 'overload-obsoleted-since) sym)))
+      (setq doc (format "%s\nThis overload is obsolete since %s;\nUse `%s' instead."
+                        doc (get overload 'overload-obsoleted-since) sym)))
     doc))
 
 (defun mode-local-augment-function-help (symbol)
@@ -630,9 +629,10 @@ SYMBOL is a function that can be overridden."
 (defun mode-local-print-binding (symbol)
   "Print the SYMBOL binding."
   (let ((value (symbol-value symbol)))
-    (princ (format "\n     ‘%s’ value is\n       " symbol))
+    (princ (format (substitute-command-keys "\n     ‘%s’ value is\n       ")
+                   symbol))
     (if (and value (symbolp value))
-        (princ (format "‘%s’" value))
+        (princ (format (substitute-command-keys "‘%s’") value))
       (let ((pt (point)))
         (pp value)
         (save-excursion
@@ -690,7 +690,7 @@ SYMBOL is a function that can be overridden."
       )
      ((symbolp buffer-or-mode)
       (setq mode buffer-or-mode)
-      (princ (format "‘%s’\n" buffer-or-mode))
+      (princ (format (substitute-command-keys "‘%s’\n") buffer-or-mode))
       )
      ((signal 'wrong-type-argument
               (list 'buffer-or-mode buffer-or-mode))))
@@ -700,7 +700,7 @@ SYMBOL is a function that can be overridden."
     (while mode
       (setq table (get mode 'mode-local-symbol-table))
       (when table
-        (princ (format "\n- From ‘%s’\n" mode))
+        (princ (format (substitute-command-keys "\n- From ‘%s’\n") mode))
         (mode-local-print-bindings table))
       (setq mode (get-mode-local-parent mode)))))
 
diff --git a/lisp/cedet/srecode/srt-mode.el b/lisp/cedet/srecode/srt-mode.el
index fbc56357b1c..48f055561ea 100644
--- a/lisp/cedet/srecode/srt-mode.el
+++ b/lisp/cedet/srecode/srt-mode.el
@@ -258,9 +258,9 @@ we can tell font lock about them.")
 	    (when (class-abstract-p C)
 	      (throw 'skip nil))
 
-	    (princ "‘")
+	    (princ (substitute-command-keys "‘"))
 	    (princ name)
-	    (princ "’")
+	    (princ (substitute-command-keys "’"))
 	    (when (slot-exists-p C 'key)
 	      (when key
 		(princ " - Character Key: ")