GNU bug report logs - #32201
27.0.50; setenv should not change match-data

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From: John Shahid <jvshahid <at> gmail.com>
To: Noam Postavsky <npostavs <at> gmail.com>
Cc: 32201 <at> debbugs.gnu.org
Subject: bug#32201: 27.0.50; setenv should not change match-data
Date: Thu, 19 Jul 2018 00:22:49 +0000

[Message part 1 (text/plain, inline)]

Noam Postavsky <npostavs <at> gmail.com> writes:

[...]

> Anyway, I don't think setenv should be changed, rather
> abbreviate-file-name should save-match-data around the expand-file-name
> call.  After all, today you happened to use setenv in a hook, tomorrow
> someone will use another match-data modifying function.

I agree, but I also think that there is no reason for `setenv' to use
`string-match' instead of `string-match-p'.  It doesn't seem to be using
the match data anyway.  I attached the patch that replaces
`string-match' with `string-match-p' in `setenv' and `setenv-internal'.
WDYT ?

[0001-Avoid-destroying-match-data-in-setenv.patch (text/x-diff, inline)]

From 7b592252f698ae07a2010302c74b42026fbbca5e Mon Sep 17 00:00:00 2001
From: John Shahid <jvshahid <at> gmail.com>
Date: Wed, 18 Jul 2018 20:18:19 -0400
Subject: [PATCH] Avoid destroying match data in 'setenv'

* lisp/env.el (setenv,setenv-internal): Replace string-match with
  string-match-p
---
 lisp/env.el | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lisp/env.el b/lisp/env.el
index e47eb57836..7007ba33e5 100644
--- a/lisp/env.el
+++ b/lisp/env.el
@@ -113,11 +113,11 @@ setenv-internal
 	     (not keep-empty)
 	     env
 	     (stringp (car env))
-	     (string-match pattern (car env)))
+             (string-match-p pattern (car env)))
 	(cdr env)
       ;; Try to find existing entry for VARIABLE in ENV.
       (while (and scan (stringp (car scan)))
-	(when (string-match pattern (car scan))
+        (when (string-match-p pattern (car scan))
 	  (if value
 	      (setcar scan (concat variable "=" value))
 	    (if keep-empty
@@ -184,7 +184,7 @@ setenv
       (setq variable (encode-coding-string variable locale-coding-system)))
   (if (and value (multibyte-string-p value))
       (setq value (encode-coding-string value locale-coding-system)))
-  (if (string-match "=" variable)
+  (if (string-match-p "=" variable)
       (error "Environment variable name `%s' contains `='" variable))
   (if (string-equal "TZ" variable)
       (set-time-zone-rule value))
-- 
2.18.0

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