# HG changeset patch
# User Bram Moolenaar <bram@vim.org>
# Date 1396367384 -7200
# Node ID 845608965bd9d0b2755997a7be812746885ff105
# Parent  af55d5dad6cf8af76778cdaa82a195afadec39ad
updated for version 7.4.232
Problem:    ":%s/\n//" uses a lot of memory. (Aidan Marlin)
Solution:   Turn this into a join command. (Christian Brabandt)

diff --git a/src/ex_cmds.c b/src/ex_cmds.c
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -4420,6 +4420,31 @@ do_sub(eap)
 	endcolumn = (curwin->w_curswant == MAXCOL);
     }
 
+    /* Recognize ":%s/\n//" and turn it into a join command, which is much
+     * more efficient.
+     * TODO: find a generic solution to make line-joining operations more
+     * efficient, avoid allocating a string that grows in size.
+     */
+    if (STRCMP(pat, "\\n") == 0 && STRLEN(pat) == 2
+	    && *sub == NUL
+	    && (*cmd == NUL || (cmd[1] == NUL && (*cmd == 'g' || *cmd == 'l'
+					     || *cmd == 'p' || *cmd == '#'))))
+    {
+	curwin->w_cursor.lnum = eap->line1;
+	if (*cmd == 'l')
+	    eap->flags = EXFLAG_LIST;
+	else if (*cmd == '#')
+	    eap->flags = EXFLAG_NR;
+	else if (*cmd == 'p')
+	    eap->flags = EXFLAG_PRINT;
+
+	(void)do_join(eap->line2 - eap->line1 + 1, FALSE, TRUE, FALSE);
+	sub_nlines = sub_nsubs = eap->line2 - eap->line1 + 1;
+	(void)do_sub_msg(FALSE);
+	ex_may_print(eap);
+	return;
+    }
+
     /*
      * Find trailing options.  When '&' is used, keep old options.
      */
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -316,7 +316,6 @@ static void	ex_winpos __ARGS((exarg_T *e
 static void	ex_operators __ARGS((exarg_T *eap));
 static void	ex_put __ARGS((exarg_T *eap));
 static void	ex_copymove __ARGS((exarg_T *eap));
-static void	ex_may_print __ARGS((exarg_T *eap));
 static void	ex_submagic __ARGS((exarg_T *eap));
 static void	ex_join __ARGS((exarg_T *eap));
 static void	ex_at __ARGS((exarg_T *eap));
@@ -8683,7 +8682,7 @@ ex_copymove(eap)
 /*
  * Print the current line if flags were given to the Ex command.
  */
-    static void
+    void
 ex_may_print(eap)
     exarg_T	*eap;
 {
diff --git a/src/proto/ex_docmd.pro b/src/proto/ex_docmd.pro
--- a/src/proto/ex_docmd.pro
+++ b/src/proto/ex_docmd.pro
@@ -54,4 +54,5 @@ int put_eol __ARGS((FILE *fd));
 int put_line __ARGS((FILE *fd, char *s));
 void dialog_msg __ARGS((char_u *buff, char *format, char_u *fname));
 char_u *get_behave_arg __ARGS((expand_T *xp, int idx));
+void ex_may_print __ARGS((exarg_T *eap));
 /* vim: set ft=c : */
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    232,
+/**/
     231,
 /**/
     230,