From 8c041b6b95f49f7383cf00e2036cf009b326fa8d Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Sat, 14 Apr 2018 18:14:06 +0200
Subject: patch 8.0.1712: terminal scrollback is not limited

Problem:    Terminal scrollback is not limited.
Solution:   Add the 'terminalscroll' option.
---
 src/option.c   |  9 +++++++++
 src/option.h   |  3 +++
 src/terminal.c | 24 +++++++++++++++++++++---
 src/version.c  |  2 ++
 4 files changed, 35 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/option.c b/src/option.c
index 5ef346c8d..9ebc51183 100644
--- a/src/option.c
+++ b/src/option.c
@@ -2748,6 +2748,15 @@ static struct vimoption options[] =
 #else
 			    (char_u*)NULL, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)FALSE}
+#endif
+			    SCRIPTID_INIT},
+    {"terminalscroll", "tlsl", P_NUM|P_VI_DEF|P_VIM|P_RBUF,
+#ifdef FEAT_TERMINAL
+			    (char_u *)&p_tlsl, PV_NONE,
+			    {(char_u *)10000L, (char_u *)10000L}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)NULL, (char_u *)0L}
 #endif
 			    SCRIPTID_INIT},
     {"termkey", "tk",	    P_STRING|P_ALLOCED|P_RWIN|P_VI_DEF,
diff --git a/src/option.h b/src/option.h
index d2ee54534..45f1a36bc 100644
--- a/src/option.h
+++ b/src/option.h
@@ -849,6 +849,9 @@ EXTERN char_u	*p_tcldll;	/* 'tcldll' */
 #ifdef FEAT_ARABIC
 EXTERN int	p_tbidi;	/* 'termbidi' */
 #endif
+#ifdef FEAT_TERMINAL
+EXTERN long	p_tlsl;		/* 'terminalscroll' */
+#endif
 #ifdef FEAT_MBYTE
 EXTERN char_u	*p_tenc;	/* 'termencoding' */
 #endif
diff --git a/src/terminal.c b/src/terminal.c
index 09d48872d..7162d684c 100644
--- a/src/terminal.c
+++ b/src/terminal.c
@@ -40,8 +40,6 @@
  * TODO:
  * - Win32: Make terminal used for :!cmd in the GUI work better.  Allow for
  *   redirection.  Probably in call to channel_set_pipes().
- * - add an optional limit for the scrollback size.  When reaching it remove
- *   10% at the start.
  * - Copy text in the vterm to the Vim buffer once in a while, so that
  *   completion works.
  * - in GUI vertical split causes problems.  Cursor is flickering. (Hirohito
@@ -2518,7 +2516,27 @@ handle_pushline(int cols, const VTermScreenCell *cells, void *user)
 {
     term_T	*term = (term_T *)user;
 
-    /* TODO: Limit the number of lines that are stored. */
+    /* If the number of lines that are stored goes over 'termscrollback' then
+     * delete the first 10%. */
+    if (term->tl_scrollback.ga_len > p_tlsl)
+    {
+	int	todo = p_tlsl / 10;
+	int	i;
+
+	curbuf = term->tl_buffer;
+	for (i = 0; i < todo; ++i)
+	{
+	    vim_free(((sb_line_T *)term->tl_scrollback.ga_data + i)->sb_cells);
+	    ml_delete(1, FALSE);
+	}
+	curbuf = curwin->w_buffer;
+
+	term->tl_scrollback.ga_len -= todo;
+	mch_memmove(term->tl_scrollback.ga_data,
+	    (sb_line_T *)term->tl_scrollback.ga_data + todo,
+	    sizeof(sb_line_T) * term->tl_scrollback.ga_len);
+    }
+
     if (ga_grow(&term->tl_scrollback, 1) == OK)
     {
 	cellattr_T	*p = NULL;
diff --git a/src/version.c b/src/version.c
index 255e24bd9..41b9721ca 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1712,
 /**/
     1711,
 /**/
-- 
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