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master 71b433f035: Fix documentation of 'unprintable' stuff
From: |
Eli Zaretskii |
Subject: |
master 71b433f035: Fix documentation of 'unprintable' stuff |
Date: |
Sat, 22 Jan 2022 09:50:25 -0500 (EST) |
branch: master
commit 71b433f0358807dca722c5b0b178d108b9d13436
Author: Eli Zaretskii <eliz@gnu.org>
Commit: Eli Zaretskii <eliz@gnu.org>
Fix documentation of 'unprintable' stuff
* src/print.c (syms_of_print) <print-unreadable-function>:
* doc/lispref/streams.texi (Input Functions, Output Variables):
Improve the documentation of 'print-unreadable-function' and
'readablep'. Add indexing and cross-references.
---
doc/lispref/streams.texi | 14 ++++++++------
src/print.c | 10 +++++-----
2 files changed, 13 insertions(+), 11 deletions(-)
diff --git a/doc/lispref/streams.texi b/doc/lispref/streams.texi
index b93a7610fa..784adb9bd5 100644
--- a/doc/lispref/streams.texi
+++ b/doc/lispref/streams.texi
@@ -359,10 +359,12 @@ non-@code{nil} value and does nothing except flushing
pending output.
@end defun
@defun readablep object
-This predicate says whether @var{object} can be written out and then
-read back by the Emacs Lisp reader. If it can't, this function
-returns @code{nil}, and if it can, a printed representation (via
-@code{prin1}) of @var{object} is returned.
+@cindex readable syntax
+This predicate says whether @var{object} has @dfn{readable syntax},
+i.e., it can be written out and then read back by the Emacs Lisp
+reader. If it can't, this function returns @code{nil}; if it can,
+this function returns a printed representation (via @code{prin1},
+@pxref{Output Functions}) of @var{object}.
@end defun
@node Output Streams
@@ -889,8 +891,8 @@ instance:
@end example
If this variable is non-@code{nil}, it should be a function that will
-be called to handle printing of these objects. The first argument is
-the object, and the second argument is the @var{noescape} flag used by
+be called to handle printing of these objects. The function will be
+called with two arguments: the object and the @var{noescape} flag used by
the printing functions (@pxref{Output Functions}).
The function should return either @code{nil} (print nothing), or a
diff --git a/src/print.c b/src/print.c
index 4d9feb55ac..e9a83d6d5d 100644
--- a/src/print.c
+++ b/src/print.c
@@ -2498,15 +2498,15 @@ priorities. Values other than nil or t are also
treated as
staticpro (&print_prune_charset_plist);
DEFVAR_LISP ("print-unreadable-function", Vprint_unreadable_function,
- doc: /* Function called when printing unreadable objects.
+ doc: /* If non-nil, a function to call when printing unreadable
objects.
By default, Emacs printing functions (like `prin1') print unreadable
-objects like \"#<...>\", where \"...\" describes the object (for
+objects as \"#<...>\", where \"...\" describes the object (for
instance, \"#<marker in no buffer>\"). If this variable is non-nil,
it should be a function which will be called to print the object instead.
-It will be called with two arguments: The object to be printed, and
-noescape (see `prin1-to-string'). If this function returns nil, the
-object will be printed as normal. If it returns a string, that string
+The function will be called with two arguments: the object to be printed, and
+the NOESCAPE flag (see `prin1-to-string'). If this function returns nil, the
+object will be printed as usual. If it returns a string, that string
will then be printed. If the function returns anything else, the
object will not be printed. */);
Vprint_unreadable_function = Qnil;
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