options: 'scrollback'

runtime/doc/nvim_terminal_emulator.txt

@@ -98,8 +98,7 @@ Mouse input is also fully supported, and has the following behavior:
 Terminal buffers can be customized through the following global/buffer-local
 variables (set via the |TermOpen| autocmd):
 
-- `{g,b}:terminal_scrollback_buffer_size`: Scrollback buffer size, between 1
-  and 100000 inclusive. The default is 1000.
+- 'scrollback' option: Scrollback lines (output history) limit.
 - `{g,b}:terminal_color_$NUM`: The terminal color palette, where `$NUM` is the
   color index, between 0 and 255 inclusive. This setting only affects UIs with
   RGB capabilities; for normal terminals the color index is simply forwarded.

runtime/doc/options.txt

@@ -4949,6 +4949,10 @@ A jump table for the options with a short description can be found at |Q_op|.
 	be used as the new value for 'scroll'.  Reset to half the window
 	height with ":set scroll=0".
 
+			*'scrollback'* *'scbk'* *'noscrollback'* *'noscbk'*
+'scrollback' 'scbk'	boolean  (default: 1000)
+			global or local to buffer |global-local|
+
 			*'scrollbind'* *'scb'* *'noscrollbind'* *'noscb'*
 'scrollbind' 'scb'	boolean  (default off)
 			local to window

src/nvim/buffer_defs.h

@@ -651,6 +651,7 @@ struct file_buffer {
   char_u *b_p_qe;               ///< 'quoteescape'
   int b_p_ro;                   ///< 'readonly'
   long b_p_sw;                  ///< 'shiftwidth'
+  long b_p_scbk;                ///< 'scrollback'
   int b_p_si;                   ///< 'smartindent'
   long b_p_sts;                 ///< 'softtabstop'
   long b_p_sts_nopaste;         ///< b_p_sts saved for paste mode

src/nvim/option.c

@@ -1,24 +1,18 @@
-/*
- * Code to handle user-settable options. This is all pretty much table-
- * driven. Checklist for adding a new option:
- * - Put it in the options array below (copy an existing entry).
- * - For a global option: Add a variable for it in option_defs.h.
- * - For a buffer or window local option:
- *   - Add a PV_XX entry to the enum below.
- *   - Add a variable to the window or buffer struct in buffer_defs.h.
- *   - For a window option, add some code to copy_winopt().
- *   - For a buffer option, add some code to buf_copy_options().
- *   - For a buffer string option, add code to check_buf_options().
- * - If it's a numeric option, add any necessary bounds checks to do_set().
- * - If it's a list of flags, add some code in do_set(), search for WW_ALL.
- * - When adding an option with expansion (P_EXPAND), but with a different
- *   default for Vi and Vim (no P_VI_DEF), add some code at VIMEXP.
- * - Add documentation!  One line in doc/help.txt, full description in
- *   options.txt, and any other related places.
- * - Add an entry in runtime/optwin.vim.
- * When making changes:
- * - Adjust the help for the option in doc/option.txt.
- */
+// User-settable options. Checklist for adding a new option:
+// - Put it in options.lua
+// - For a global option: Add a variable for it in option_defs.h.
+// - For a buffer or window local option:
+//   - Add a BV_XX or WV_XX entry to option_defs.h
+//   - Add a variable to the window or buffer struct in buffer_defs.h.
+//   - For a window option, add some code to copy_winopt().
+//   - For a buffer option, add some code to buf_copy_options().
+//   - For a buffer string option, add code to check_buf_options().
+// - If it's a numeric option, add any necessary bounds checks to do_set().
+// - If it's a list of flags, add some code in do_set(), search for WW_ALL.
+// - When adding an option with expansion (P_EXPAND), but with a different
+//   default for Vi and Vim (no P_VI_DEF), add some code at VIMEXP.
+// - Add documentation! doc/options.txt, and any other related places.
+// - Add an entry in runtime/optwin.vim.
 
 #define IN_OPTION_C
 #include <assert.h>
@@ -161,6 +155,7 @@ static long p_ts;
 static long p_tw;
 static int p_udf;
 static long p_wm;
+static long p_scbk;
 static char_u   *p_keymap;
 
 /* Saved values for when 'bin' is set. */
@@ -3999,7 +3994,16 @@ set_num_option (
   /*
    * Number options that need some action when changed
    */
-  if (pp == &p_wh || pp == &p_hh) {
+  if (pp == &p_scbk) {
+    // 'scrollback'
+    if (p_scbk < 1) {
+      errmsg = e_invarg;
+      p_scbk = 0;
+    } else if (p_scbk > 100000) {
+      errmsg = e_invarg;
+      p_scbk = 100000;
+    }
+  } else if (pp == &p_wh || pp == &p_hh) {
     if (p_wh < 1) {
       errmsg = e_positive;
       p_wh = 1;
@@ -5426,6 +5430,7 @@ static char_u *get_varp(vimoption_T *p)
   case PV_PI:     return (char_u *)&(curbuf->b_p_pi);
   case PV_QE:     return (char_u *)&(curbuf->b_p_qe);
   case PV_RO:     return (char_u *)&(curbuf->b_p_ro);
+  case PV_SCBK:   return (char_u *)&(curbuf->b_p_scbk);
   case PV_SI:     return (char_u *)&(curbuf->b_p_si);
   case PV_STS:    return (char_u *)&(curbuf->b_p_sts);
   case PV_SUA:    return (char_u *)&(curbuf->b_p_sua);
@@ -5636,6 +5641,7 @@ void buf_copy_options(buf_T *buf, int flags)
       buf->b_p_ai = p_ai;
       buf->b_p_ai_nopaste = p_ai_nopaste;
       buf->b_p_sw = p_sw;
+      buf->b_p_scbk = p_scbk;
       buf->b_p_tw = p_tw;
       buf->b_p_tw_nopaste = p_tw_nopaste;
       buf->b_p_tw_nobin = p_tw_nobin;

src/nvim/option_defs.h

@@ -739,6 +739,7 @@ enum {
   , BV_PI
   , BV_QE
   , BV_RO
+  , BV_SCBK
   , BV_SI
   , BV_SMC
   , BV_SYN

src/nvim/options.lua

@@ -1912,6 +1912,14 @@ return {
       pv_name='p_scroll',
       defaults={if_true={vi=12}}
     },
+    {
+      full_name='scrollback', abbreviation='scbk',
+      type='number', scope={'buffer'},
+      vi_def=true,
+      varname='p_scbk',
+      redraw={'current_buffer'},
+      defaults={if_true={vi=1000}}
+    },
     {
       full_name='scrollbind', abbreviation='scb',
       type='bool', scope={'window'},