From c60735fbb8448eff772caefa90ae553e7e0b7623 Mon Sep 17 00:00:00 2001
From: Eric Blake <ebb9@byu.net>
Date: Tue, 22 Apr 2008 14:19:27 -0600
Subject: Support unbalanced () in AT_SETUP by adding two new quadrigraphs.

* bin/autom4te.in (handle_output): Substitute @{:@ and @:}@.
(handle_traces): Likewise.
* lib/m4sugar/m4sugar.m4 (m4_qlen): Account for new quadrigraphs.
* tests/autotest.at (AT_CHECK_AT_TITLE_CHAR): Add new tests.
* doc/autoconf.texi (Quadrigraphs): Document them.
(Evaluation Macros) <m4_expand>: Enhance documentation.
(Text processing Macros) <m4_text_box>: Document cases where
quadrigraphs can help for problemetic unbalanced parentheses.
(Pretty Help Strings) <AS_HELP_STRING>: Likewise.
(Writing Testsuites) <AT_SETUP>: Likewise.
(Limitations of Builtins) <case>: Consolidate text on unbalanced
parentheses, and add an example of creative comments.
* NEWS: Document the addition.
Reported by Joel E. Denny.

Signed-off-by: Eric Blake <ebb9@byu.net>
---
 bin/autom4te.in | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'bin')

diff --git a/bin/autom4te.in b/bin/autom4te.in
index 1f9aee8d..685df41a 100644
--- a/bin/autom4te.in
+++ b/bin/autom4te.in
@@ -575,6 +575,8 @@ sub handle_output ($$)
       s/__oline__/$./g;
       s/\@<:\@/[/g;
       s/\@:>\@/]/g;
+      s/\@\{:\@/(/g;
+      s/\@:\}\@/)/g;
       s/\@S\|\@/\$/g;
       s/\@%:\@/#/g;
 
@@ -856,6 +858,8 @@ EOF
       # It makes no sense to try to transform __oline__.
       s/\@<:\@/[/g;
       s/\@:>\@/]/g;
+      s/\@\{:\@/(/g;
+      s/\@:\}\@/)/g;
       s/\@S\|\@/\$/g;
       s/\@%:\@/#/g;
       s/\@&t\@//g;
-- 
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