From 79a91dcb64b13c366d19ceaef7fd4b6282f98249 Mon Sep 17 00:00:00 2001
From: lum <lum@openbsd.org>
Date: Thu, 22 Apr 2021 19:50:55 +0000
Subject: [PATCH] Add a non-interactive version of query-replace-regexp
 function called replace-regexp. Unfortunately query-replace-regexp can't be
 used in a startup file.

---
 usr.bin/mg/def.h       |  3 ++-
 usr.bin/mg/funmap.c    |  3 ++-
 usr.bin/mg/mg.1        |  6 ++++--
 usr.bin/mg/re_search.c | 30 +++++++++++++++++++++++++++++-
 4 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/usr.bin/mg/def.h b/usr.bin/mg/def.h
index f5102b840ac..ee32c06f127 100644
--- a/usr.bin/mg/def.h
+++ b/usr.bin/mg/def.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: def.h,v 1.172 2021/04/20 10:02:50 lum Exp $	*/
+/*	$OpenBSD: def.h,v 1.173 2021/04/22 19:50:55 lum Exp $	*/
 
 /* This file is in the public domain. */
 
@@ -673,6 +673,7 @@ int		 re_forwsearch(int, int);
 int		 re_backsearch(int, int);
 int		 re_searchagain(int, int);
 int		 re_queryrepl(int, int);
+int		 re_repl(int, int);
 int		 replstr(int, int);
 int		 setcasefold(int, int);
 int		 delmatchlines(int, int);
diff --git a/usr.bin/mg/funmap.c b/usr.bin/mg/funmap.c
index c6c59272ed8..36a88e4573d 100644
--- a/usr.bin/mg/funmap.c
+++ b/usr.bin/mg/funmap.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: funmap.c,v 1.62 2021/04/20 16:34:20 lum Exp $	*/
+/*	$OpenBSD: funmap.c,v 1.63 2021/04/22 19:50:55 lum Exp $	*/
 
 /* This file is in the public domain */
 
@@ -181,6 +181,7 @@ static struct funmap functnames[] = {
 	{reposition, "recenter", 0},
 	{redraw, "redraw-display", 0},
 #ifdef REGEX
+	{re_repl, "replace-regexp", 2},
 	{replstr, "replace-string", 2},
 #endif /* REGEX */
 	{revertbuffer, "revert-buffer", 0},
diff --git a/usr.bin/mg/mg.1 b/usr.bin/mg/mg.1
index e43d851b513..c13a7c15366 100644
--- a/usr.bin/mg/mg.1
+++ b/usr.bin/mg/mg.1
@@ -1,7 +1,7 @@
-.\"	$OpenBSD: mg.1,v 1.123 2021/04/20 10:02:50 lum Exp $
+.\"	$OpenBSD: mg.1,v 1.124 2021/04/22 19:50:55 lum Exp $
 .\" This file is in the public domain.
 .\"
-.Dd $Mdocdate: April 20 2021 $
+.Dd $Mdocdate: April 22 2021 $
 .Dt MG 1
 .Os
 .Sh NAME
@@ -778,6 +778,8 @@ Display current (global) working directory in the status area.
 .It query-replace
 Query Replace.
 Search and replace strings selectively, prompting after each match.
+.It replace-regexp
+Replace regular expression globally without individual prompting.
 .It replace-string
 Replace string globally without individual prompting.
 .It query-replace-regexp
diff --git a/usr.bin/mg/re_search.c b/usr.bin/mg/re_search.c
index 95349dd3951..eba9b03c3a6 100644
--- a/usr.bin/mg/re_search.c
+++ b/usr.bin/mg/re_search.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: re_search.c,v 1.35 2020/07/22 13:29:05 tb Exp $	*/
+/*	$OpenBSD: re_search.c,v 1.36 2021/04/22 19:50:55 lum Exp $	*/
 
 /* This file is in the public domain. */
 
@@ -211,6 +211,34 @@ stopsearch:
 	return (TRUE);
 }
 
+int
+re_repl(int f, int n)
+{
+	int     rcnt = 0;		/* replacements made so far     */
+	int     plen, s;		/* length of found string       */
+	char    news[NPAT];		/* replacement string           */
+
+	if ((s = re_readpattern("RE Replace")) != TRUE)
+		return (s);
+	if (eread("Replace %s with: ", news, NPAT,
+	    EFNUL | EFNEW | EFCR, re_pat) == NULL)
+                return (ABORT);
+
+	while (re_forwsrch() == TRUE) {
+		plen = regex_match[0].rm_eo - regex_match[0].rm_so;
+		if (re_doreplace((RSIZE)plen, news) == FALSE)
+			return (FALSE);
+		rcnt++;
+	}
+
+	curwp->w_rflag |= WFFULL;
+	update(CMODE);
+	if (!inmacro)
+		ewprintf("(%d replacement(s) done)", rcnt);
+	
+	return(TRUE);
+}
+
 /*
  * Routine re_doreplace calls lreplace to make replacements needed by
  * re_query replace.  Its reason for existence is to deal with \1, \2. etc.
-- 
2.20.1