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[Emacs-diffs] trunk r116016: `define-alternatives' bugfix and UI enhance
From: |
Bastien Guerry |
Subject: |
[Emacs-diffs] trunk r116016: `define-alternatives' bugfix and UI enhancement |
Date: |
Mon, 13 Jan 2014 22:14:33 +0000 |
User-agent: |
Bazaar (2.6b2) |
------------------------------------------------------------
revno: 116016
revision-id: address@hidden
parent: address@hidden
committer: Bastien Guerry <address@hidden>
branch nick: trunk
timestamp: Mon 2014-01-13 23:13:44 +0100
message:
`define-alternatives' bugfix and UI enhancement
* simple.el (define-alternatives): Call the selected command
interactively. When setting `COMMAND--implementation' for the
first time, tell the user how to chose another implementation.
Enhance the docstring.
modified:
lisp/ChangeLog changelog-20091113204419-o5vbwnq5f7feedwu-1432
lisp/simple.el simple.el-20091113204419-o5vbwnq5f7feedwu-403
=== modified file 'lisp/ChangeLog'
--- a/lisp/ChangeLog 2014-01-13 15:33:01 +0000
+++ b/lisp/ChangeLog 2014-01-13 22:13:44 +0000
@@ -1,3 +1,10 @@
+2014-01-13 Bastien Guerry <address@hidden>
+
+ * simple.el (define-alternatives): Call the selected command
+ interactively. When setting `COMMAND--implementation' for the
+ first time, tell the user how to chose another implementation.
+ Enhance the docstring.
+
2014-01-13 Stefan Monnier <address@hidden>
* vc/log-edit.el: Fix highlighting of summary when it's the first line.
=== modified file 'lisp/simple.el'
--- a/lisp/simple.el 2014-01-12 04:00:03 +0000
+++ b/lisp/simple.el 2014-01-13 22:13:44 +0000
@@ -7654,10 +7654,20 @@
;; ;;;###autoload (push '("My impl name" . my-impl-symbol) COMMAND-alternatives
(defmacro define-alternatives (command &rest customizations)
- "Define new command `COMMAND'.
-The variable `COMMAND-alternatives' will contain alternative
-implementations of COMMAND, so that running `C-u M-x COMMAND'
-will allow the user to chose among them.
+ "Define the new command `COMMAND'.
+
+The argument `COMMAND' should be a symbol.
+
+Running `M-x COMMAND RET' for the first time prompts for which
+alternative to use and record the selected command as a custom
+variable.
+
+Running `C-u M-x COMMAND RET' prompts again and overwrite the
+previous choice.
+
+The variable `COMMAND-alternatives' contains an alist with
+alternative implementations of COMMAND.
+
CUSTOMIZATIONS, if non-nil, should be composed of alternating
`defcustom' keywords and values to add to the declaration of
`COMMAND-alternatives' (typically :group and :version)."
@@ -7688,13 +7698,19 @@
(interactive "P")
(when (or arg (null ,varimp-sym))
(let ((val (completing-read
- ,(format "Select implementation for command `%s': "
command-name)
- ,varalt-sym nil t)))
+ ,(format "Select implementation for command `%s': "
+ command-name)
+ ,varalt-sym nil t)))
(unless (string-equal val "")
- (customize-save-variable ',varimp-sym
- (cdr (assoc-string val
,varalt-sym))))))
+ (when (null ,varimp-sym)
+ (message
+ "Use `C-u M-x %s RET' to select another implementation"
+ ,command-name)
+ (sit-for 3))
+ (customize-save-variable ',varimp-sym
+ (cdr (assoc-string val ,varalt-sym))))))
(if ,varimp-sym
- (funcall ,varimp-sym)
+ (call-interactively ,varimp-sym)
(message ,(format "No implementation selected for command `%s'"
command-name)))))))
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