[Emacs-diffs] emacs-26 8582936: Improve documentation of 'read-command'

[Eli Zaretskii]

branch: emacs-26
commit 85829363f728c410e33ffdc3839202977b2115cc
Author: Eli Zaretskii <address@hidden>
Commit: Eli Zaretskii <address@hidden>

    Improve documentation of 'read-command'
    
    * src/minibuf.c (Fread_command): Document the return value
    when DEFAULT-VALUE is nil and the user enters nothing.
    * doc/lispref/minibuf.texi (High-Level Completion): Document
    the printed representation of a symbol whose name is empty.
    (Bug#3522)
---
 doc/lispref/minibuf.texi | 3 ++-
 src/minibuf.c            | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/doc/lispref/minibuf.texi b/doc/lispref/minibuf.texi
index 796be07..3a2a9d8 100644
--- a/doc/lispref/minibuf.texi
+++ b/doc/lispref/minibuf.texi
@@ -1327,7 +1327,8 @@ is a string, @code{read-command} interns it before 
returning it.
 If it is a list, @code{read-command} interns the first element of this list.
 If @var{default} is @code{nil}, that means no default has been
 specified; then if the user enters null input, the return value is
address@hidden(intern "")}, that is, a symbol whose name is an empty string.
address@hidden(intern "")}, that is, a symbol whose name is an empty string,
+and whose printed representation is @code{##} (@pxref{Symbol Type}).
 
 @example
 (read-command "Command name? ")
diff --git a/src/minibuf.c b/src/minibuf.c
index 6964f35..a33ddf4 100644
--- a/src/minibuf.c
+++ b/src/minibuf.c
@@ -1054,7 +1054,8 @@ the current input method and the setting 
of`enable-multibyte-characters'.  */)
 DEFUN ("read-command", Fread_command, Sread_command, 1, 2, 0,
        doc: /* Read the name of a command and return as a symbol.
 Prompt with PROMPT.  By default, return DEFAULT-VALUE or its first element
-if it is a list.  */)
+if it is a list.  If DEFAULT-VALUE is omitted or nil, and the user enters
+null input, return a symbol whose name is an empty string.  */)
   (Lisp_Object prompt, Lisp_Object default_value)
 {
   Lisp_Object name, default_string;