patch 8.0.1712: terminal scrollback is not limitedv8.0.1712

Problem:    Terminal scrollback is not limited.
Solution:   Add the 'terminalscroll' option.

6 files changed, 54 insertions, 7 deletions

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index cc19e253d..0820699c6 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -1,4 +1,4 @@
-*options.txt*	For Vim version 8.0.  Last change: 2018 Mar 13
+*options.txt*	For Vim version 8.0.  Last change: 2018 Apr 14
 
 
 		  VIM REFERENCE MANUAL	  by Bram Moolenaar
@@ -7933,6 +7933,16 @@ A jump table for the options with a short description can be found at |Q_op|.
 	Note that the "cterm" attributes are still used, not the "gui" ones.
 	NOTE: This option is reset when 'compatible' is set.
 
+						*'terminalscroll'* *'tlsl'*
+'terminalscroll' 'tlsl'	number	(default 10000)
+			global
+			{not in Vi}
+			{not available when compiled without the
+			|+terminal| feature}
+	Number of scrollback lines to keep.  When going over this limit the
+	first 10% of the scrollback lines are deleted.  This is just to reduce
+	the memory usage.  See |Terminal-Normal|.
+
 						*'termkey'* *'tk'*
 'termkey' 'tk'		string	(default "")
 			local to window
diff --git a/runtime/doc/terminal.txt b/runtime/doc/terminal.txt
index 63217c2fa..23e210dc8 100644
--- a/runtime/doc/terminal.txt
+++ b/runtime/doc/terminal.txt
@@ -288,7 +288,7 @@ not when 'termsize' is "rowsXcols".
 
 
 Terminal-Job and Terminal-Normal mode ~
-							*Terminal-mode*
+						*Terminal-mode* *Terminal-Job*
 When the job is running the contents of the terminal is under control of the
 job.  That includes the cursor position.  Typed keys are sent to the job.
 The terminal contents can change at any time.  This is called Terminal-Job
@@ -301,7 +301,9 @@ suspended.  CTRL-\ CTRL-N does the same.
 Terminal-Job mode is where |:tmap| mappings are applied. Keys sent by
 |term_sendkeys()| are not subject to tmap, but keys from |feedkeys()| are.
 
-							*E946*
+It is not possible to enter Insert mode from Terminal-Job mode.
+
+						*Terminal-Normal* *E946*
 In Terminal-Normal mode you can move the cursor around with the usual Vim
 commands, Visually mark text, yank text, etc.  But you cannot change the
 contents of the buffer.  The commands that would start insert mode, such as
@@ -312,7 +314,10 @@ In Terminal-Normal mode the statusline and window title show "(Terminal)".  If
 the job ends while in Terminal-Normal mode this changes to
 "(Terminal-finished)".
 
-It is not possible to enter Insert mode from Terminal-Job mode.
+When the job outputs lines in the terminal, such that the contents scrolls off
+the top, those lines are remembered and can be seen in Terminal-Normal mode.
+The number of lines is limited by the 'terminalscroll' option. When going over
+this limit, the first 10% of the scrolled lins are deleted and are lost.
 
 
 Cursor style ~
diff --git a/src/option.c b/src/option.c
index 5ef346c8d..9ebc51183 100644
--- a/src/option.c
+++ b/src/option.c
@@ -2750,6 +2750,15 @@ static struct vimoption options[] =
 			    {(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,
 #ifdef FEAT_TERMINAL
 			    (char_u *)VAR_WIN, PV_TK,
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
@@ -763,6 +763,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1712,
+/**/
     1711,
 /**/
     1710,