I have no idea what happened to the first lines of the patch. Here goes
again, with a prompt example.

# fancy readline prompt patch for psql
# 
# This is a patch to support readline prompts which contain non-printing
# characters, as for fancy colorized prompts.  This was nearly a direct
# lift from bash-2.05b's lib/readline/display.c, per guidance from Chet
# Ramey.
#
# Usage:
# Invisible characters within the prompt must be quoted with %[ and %].
# example: \set PROMPT1 '%[%033[1;[EMAIL PROTECTED]/%R%[%033[0m%]%# '
# 
# Is pset.useReadline used anywhere? It's set to 0 by default, even when
# readline is in use, and therefore I ignored it below.
#
# 2004/01/15 (Thu) 14:27 Reece Hart <[EMAIL PROTECTED]>


--- postgresql-7.4.1/src/bin/psql/prompt.c-orig 2004-01-15
10:47:05.000000000 -0800
+++ postgresql-7.4.1/src/bin/psql/prompt.c      2004-01-15 14:21:27.000000000
-0800
@@ -14,4 +14,5 @@
 #include "common.h"
 #include "variables.h"
+#include "input.h"
 
 #ifdef WIN32
@@ -242,4 +243,17 @@
                                        break;
 
+                           case '[':
+                           case ']':
+#if defined (USE_READLINE)
+                                 buf[0] = '\001';
+                                 buf[1] = (*p == '[') ? RL_PROMPT_START_IGNORE :
RL_PROMPT_END_IGNORE;
+                                 buf[2] = '\0';
+#else
+                                         /* Should we remove text between %[ and %]
+                                                e.g., for fancy prompts on dumb 
terminals ?
+                                                If so, under what conditions? */
+#endif /* USE_READLINE */
+                                 break;
+                               /* end case [ or ] */
+                                       
                                        /* execute command */
                                case '`':


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