[PATCH] make OLDPWD influence 'cd -'

[hanpingtian <hanpingtian@163.com>]

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I found OLDPWD's value doesn't influence 'cd -' if changed before run,
like what bash will do:
[hpt@hpt]~% echo $OLDPWD
/home/hpt
[hpt@hpt]~% vared OLDPWD
/tmp
[hpt@hpt]~% echo $OLDPWD
/tmp
[hpt@hpt]~% cd -
~
[hpt@hpt]~% pwd
/home/hpt

This patch will let zsh check OLDPWD before run 'cd -', so let OLDPWD
influence it:
[hpt@hpt]~% echo $OLDPWD
/home/hpt
[hpt@hpt]~% vared OLDPWD
/tmp
[hpt@hpt]~% cd -
/tmp
[hpt@hpt]/tmp% pwd
/tmp
[hpt@hpt]/tmp%


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From 06c3c9f23483f45a4a7252fdc8e8df82853bda17 Mon Sep 17 00:00:00 2001
From: Han Pingtian <hanpingtian@163.com>
Date: Fri, 3 Jun 2011 11:48:56 +0800
Subject: [PATCH] make OLDPWD settable

I found OLDPWD's value doesn't influence 'cd -' if changed before run,
like what bash will do:
[hpt@hpt]~% echo $OLDPWD
/home/hpt
[hpt@hpt]~% vared OLDPWD
/tmp
[hpt@hpt]~% echo $OLDPWD
/tmp
[hpt@hpt]~% cd -
~
[hpt@hpt]~% pwd
/home/hpt

This patch will let zsh check OLDPWD before run 'cd -', so let OLDPWD
influence it:
[hpt@hpt]~% echo $OLDPWD
/home/hpt
[hpt@hpt]~% vared OLDPWD
/tmp
[hpt@hpt]~% cd -
/tmp
[hpt@hpt]/tmp% pwd
/tmp
[hpt@hpt]/tmp%
---
 Src/builtin.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/Src/builtin.c b/Src/builtin.c
index fc98eb1..50274f6 100644
--- a/Src/builtin.c
+++ b/Src/builtin.c
@@ -864,9 +864,16 @@ cd_get_dest(char *nam, char **argv, int hard, int func)
 		}
 	    }
 	}
-	if (!dir)
+	if (!dir) {
+	    char *t = getsparam("OLDPWD");
+	    if (t != NULL) {
+		zsfree(oldpwd);
+		oldpwd=ztrdup(t);
+	    }
+
 	    zpushnode(dirstack, ztrdup(strcmp(argv[0], "-")
 				       ? (doprintdir--, argv[0]) : oldpwd));
+	}
     } else {
 	char *u, *d;
 	int len1, len2, len3;
-- 
1.7.1