patch 8.1.2057: the screen.c file is much too bigv8.1.2057

Problem:    The screen.c file is much too big.
Solution:   Split it in three parts. (Yegappan Lakshmanan, closes #4943)

1 files changed, 3112 insertions, 0 deletions

diff --git a/src/drawscreen.c b/src/drawscreen.c
new file mode 100644
index 0000000000..f6776a1a18
--- /dev/null
+++ b/src/drawscreen.c
@@ -0,0 +1,3112 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+
+/*
+ * drawscreen.c: Code for updating all the windows on the screen.
+ * This is the top level, drawline.c is the middle and screen.c the lower
+ * level.
+ *
+ * update_screen() is the function that updates all windows and status lines.
+ * It is called form the main loop when must_redraw is non-zero.  It may be
+ * called from other places when an immediate screen update is needed.
+ *
+ * The part of the buffer that is displayed in a window is set with:
+ * - w_topline (first buffer line in window)
+ * - w_topfill (filler lines above the first line)
+ * - w_leftcol (leftmost window cell in window),
+ * - w_skipcol (skipped window cells of first line)
+ *
+ * Commands that only move the cursor around in a window, do not need to take
+ * action to update the display.  The main loop will check if w_topline is
+ * valid and update it (scroll the window) when needed.
+ *
+ * Commands that scroll a window change w_topline and must call
+ * check_cursor() to move the cursor into the visible part of the window, and
+ * call redraw_later(VALID) to have the window displayed by update_screen()
+ * later.
+ *
+ * Commands that change text in the buffer must call changed_bytes() or
+ * changed_lines() to mark the area that changed and will require updating
+ * later.  The main loop will call update_screen(), which will update each
+ * window that shows the changed buffer.  This assumes text above the change
+ * can remain displayed as it is.  Text after the change may need updating for
+ * scrolling, folding and syntax highlighting.
+ *
+ * Commands that change how a window is displayed (e.g., setting 'list') or
+ * invalidate the contents of a window in another way (e.g., change fold
+ * settings), must call redraw_later(NOT_VALID) to have the whole window
+ * redisplayed by update_screen() later.
+ *
+ * Commands that change how a buffer is displayed (e.g., setting 'tabstop')
+ * must call redraw_curbuf_later(NOT_VALID) to have all the windows for the
+ * buffer redisplayed by update_screen() later.
+ *
+ * Commands that change highlighting and possibly cause a scroll too must call
+ * redraw_later(SOME_VALID) to update the whole window but still use scrolling
+ * to avoid redrawing everything.  But the length of displayed lines must not
+ * change, use NOT_VALID then.
+ *
+ * Commands that move the window position must call redraw_later(NOT_VALID).
+ * TODO: should minimize redrawing by scrolling when possible.
+ *
+ * Commands that change everything (e.g., resizing the screen) must call
+ * redraw_all_later(NOT_VALID) or redraw_all_later(CLEAR).
+ *
+ * Things that are handled indirectly:
+ * - When messages scroll the screen up, msg_scrolled will be set and
+ *   update_screen() called to redraw.
+ */
+
+#include "vim.h"
+
+static void win_update(win_T *wp);
+#ifdef FEAT_STL_OPT
+static void redraw_custom_statusline(win_T *wp);
+#endif
+
+/*
+ * Based on the current value of curwin->w_topline, transfer a screenfull
+ * of stuff from Filemem to ScreenLines[], and update curwin->w_botline.
+ * Return OK when the screen was updated, FAIL if it was not done.
+ */
+    int
+update_screen(int type_arg)
+{
+    int		type = type_arg;
+    win_T	*wp;
+    static int	did_intro = FALSE;
+#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
+    int		did_one;
+#endif
+#ifdef FEAT_GUI
+    int		did_undraw = FALSE;
+    int		gui_cursor_col = 0;
+    int		gui_cursor_row = 0;
+#endif
+    int		no_update = FALSE;
+
+    // Don't do anything if the screen structures are (not yet) valid.
+    if (!screen_valid(TRUE))
+	return FAIL;
+
+    if (type == VALID_NO_UPDATE)
+    {
+	no_update = TRUE;
+	type = 0;
+    }
+
+#ifdef FEAT_EVAL
+    {
+	buf_T *buf;
+
+	// Before updating the screen, notify any listeners of changed text.
+	FOR_ALL_BUFFERS(buf)
+	    invoke_listeners(buf);
+    }
+#endif
+
+#ifdef FEAT_DIFF
+    // May have postponed updating diffs.
+    if (need_diff_redraw)
+	diff_redraw(TRUE);
+#endif
+
+    if (must_redraw)
+    {
+	if (type < must_redraw)	    // use maximal type
+	    type = must_redraw;
+
+	// must_redraw is reset here, so that when we run into some weird
+	// reason to redraw while busy redrawing (e.g., asynchronous
+	// scrolling), or update_topline() in win_update() will cause a
+	// scroll, the screen will be redrawn later or in win_update().
+	must_redraw = 0;
+    }
+
+    // May need to update w_lines[].
+    if (curwin->w_lines_valid == 0 && type < NOT_VALID
+#ifdef FEAT_TERMINAL
+	    && !term_do_update_window(curwin)
+#endif
+		)
+	type = NOT_VALID;
+
+    // Postpone the redrawing when it's not needed and when being called
+    // recursively.
+    if (!redrawing() || updating_screen)
+    {
+	redraw_later(type);		// remember type for next time
+	must_redraw = type;
+	if (type > INVERTED_ALL)
+	    curwin->w_lines_valid = 0;	// don't use w_lines[].wl_size now
+	return FAIL;
+    }
+    updating_screen = TRUE;
+
+#ifdef FEAT_TEXT_PROP
+    // Update popup_mask if needed.  This may set w_redraw_top and w_redraw_bot
+    // in some windows.
+    may_update_popup_mask(type);
+#endif
+
+#ifdef FEAT_SYN_HL
+    ++display_tick;	    // let syntax code know we're in a next round of
+			    // display updating
+#endif
+    if (no_update)
+	++no_win_do_lines_ins;
+
+    // if the screen was scrolled up when displaying a message, scroll it down
+    if (msg_scrolled)
+    {
+	clear_cmdline = TRUE;
+	if (msg_scrolled > Rows - 5)	    // clearing is faster
+	    type = CLEAR;
+	else if (type != CLEAR)
+	{
+	    check_for_delay(FALSE);
+	    if (screen_ins_lines(0, 0, msg_scrolled, (int)Rows, 0, NULL)
+								       == FAIL)
+		type = CLEAR;
+	    FOR_ALL_WINDOWS(wp)
+	    {
+		if (wp->w_winrow < msg_scrolled)
+		{
+		    if (W_WINROW(wp) + wp->w_height > msg_scrolled
+			    && wp->w_redr_type < REDRAW_TOP
+			    && wp->w_lines_valid > 0
+			    && wp->w_topline == wp->w_lines[0].wl_lnum)
+		    {
+			wp->w_upd_rows = msg_scrolled - W_WINROW(wp);
+			wp->w_redr_type = REDRAW_TOP;
+		    }
+		    else
+		    {
+			wp->w_redr_type = NOT_VALID;
+			if (W_WINROW(wp) + wp->w_height + wp->w_status_height
+							       <= msg_scrolled)
+			    wp->w_redr_status = TRUE;
+		    }
+		}
+	    }
+	    if (!no_update)
+		redraw_cmdline = TRUE;
+	    redraw_tabline = TRUE;
+	}
+	msg_scrolled = 0;
+	need_wait_return = FALSE;
+    }
+
+    // reset cmdline_row now (may have been changed temporarily)
+    compute_cmdrow();
+
+    // Check for changed highlighting
+    if (need_highlight_changed)
+	highlight_changed();
+
+    if (type == CLEAR)		// first clear screen
+    {
+	screenclear();		// will reset clear_cmdline
+	type = NOT_VALID;
+	// must_redraw may be set indirectly, avoid another redraw later
+	must_redraw = 0;
+    }
+
+    if (clear_cmdline)		// going to clear cmdline (done below)
+	check_for_delay(FALSE);
+
+#ifdef FEAT_LINEBREAK
+    // Force redraw when width of 'number' or 'relativenumber' column
+    // changes.
+    if (curwin->w_redr_type < NOT_VALID
+	   && curwin->w_nrwidth != ((curwin->w_p_nu || curwin->w_p_rnu)
+				    ? number_width(curwin) : 0))
+	curwin->w_redr_type = NOT_VALID;
+#endif
+
+    // Only start redrawing if there is really something to do.
+    if (type == INVERTED)
+	update_curswant();
+    if (curwin->w_redr_type < type
+	    && !((type == VALID
+		    && curwin->w_lines[0].wl_valid
+#ifdef FEAT_DIFF
+		    && curwin->w_topfill == curwin->w_old_topfill
+		    && curwin->w_botfill == curwin->w_old_botfill
+#endif
+		    && curwin->w_topline == curwin->w_lines[0].wl_lnum)
+		|| (type == INVERTED
+		    && VIsual_active
+		    && curwin->w_old_cursor_lnum == curwin->w_cursor.lnum
+		    && curwin->w_old_visual_mode == VIsual_mode
+		    && (curwin->w_valid & VALID_VIRTCOL)
+		    && curwin->w_old_curswant == curwin->w_curswant)
+		))
+	curwin->w_redr_type = type;
+
+    // Redraw the tab pages line if needed.
+    if (redraw_tabline || type >= NOT_VALID)
+	draw_tabline();
+
+#ifdef FEAT_SYN_HL
+    // Correct stored syntax highlighting info for changes in each displayed
+    // buffer.  Each buffer must only be done once.
+    FOR_ALL_WINDOWS(wp)
+    {
+	if (wp->w_buffer->b_mod_set)
+	{
+	    win_T	*wwp;
+
+	    // Check if we already did this buffer.
+	    for (wwp = firstwin; wwp != wp; wwp = wwp->w_next)
+		if (wwp->w_buffer == wp->w_buffer)
+		    break;
+	    if (wwp == wp && syntax_present(wp))
+		syn_stack_apply_changes(wp->w_buffer);
+	}
+    }
+#endif
+
+    // Go from top to bottom through the windows, redrawing the ones that need
+    // it.
+#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
+    did_one = FALSE;
+#endif
+#ifdef FEAT_SEARCH_EXTRA
+    screen_search_hl.rm.regprog = NULL;
+#endif
+    FOR_ALL_WINDOWS(wp)
+    {
+	if (wp->w_redr_type != 0)
+	{
+	    cursor_off();
+#if defined(FEAT_SEARCH_EXTRA) || defined(FEAT_CLIPBOARD)
+	    if (!did_one)
+	    {
+		did_one = TRUE;
+# ifdef FEAT_SEARCH_EXTRA
+		start_search_hl();
+# endif
+# ifdef FEAT_CLIPBOARD
+		// When Visual area changed, may have to update selection.
+		if (clip_star.available && clip_isautosel_star())
+		    clip_update_selection(&clip_star);
+		if (clip_plus.available && clip_isautosel_plus())
+		    clip_update_selection(&clip_plus);
+# endif
+#ifdef FEAT_GUI
+		// Remove the cursor before starting to do anything, because
+		// scrolling may make it difficult to redraw the text under
+		// it.
+		if (gui.in_use && wp == curwin)
+		{
+		    gui_cursor_col = gui.cursor_col;
+		    gui_cursor_row = gui.cursor_row;
+		    gui_undraw_cursor();
+		    did_undraw = TRUE;
+		}
+#endif
+	    }
+#endif
+	    win_update(wp);
+	}
+
+	// redraw status line after the window to minimize cursor movement
+	if (wp->w_redr_status)
+	{
+	    cursor_off();
+	    win_redr_status(wp, TRUE); // any popup menu will be redrawn below
+	}
+    }
+#if defined(FEAT_SEARCH_EXTRA)
+    end_search_hl();
+#endif
+    // May need to redraw the popup menu.
+    pum_may_redraw();
+
+    // Reset b_mod_set flags.  Going through all windows is probably faster
+    // than going through all buffers (there could be many buffers).
+    FOR_ALL_WINDOWS(wp)
+	wp->w_buffer->b_mod_set = FALSE;
+
+#ifdef FEAT_TEXT_PROP
+    // Display popup windows on top of the windows and command line.
+    update_popups(win_update);
+#endif
+
+    after_updating_screen(TRUE);
+
+    // Clear or redraw the command line.  Done last, because scrolling may
+    // mess up the command line.
+    if (clear_cmdline || redraw_cmdline || redraw_mode)
+	showmode();
+
+    if (no_update)
+	--no_win_do_lines_ins;
+
+    // May put up an introductory message when not editing a file
+    if (!did_intro)
+	maybe_intro_message();
+    did_intro = TRUE;
+
+#ifdef FEAT_GUI
+    // Redraw the cursor and update the scrollbars when all screen updating is
+    // done.
+    if (gui.in_use)
+    {
+	if (did_undraw && !gui_mch_is_blink_off())
+	{
+	    mch_disable_flush();
+	    out_flush();	// required before updating the cursor
+	    mch_enable_flush();
+
+	    // Put the GUI position where the cursor was, gui_update_cursor()
+	    // uses that.
+	    gui.col = gui_cursor_col;
+	    gui.row = gui_cursor_row;
+	    gui.col = mb_fix_col(gui.col, gui.row);
+	    gui_update_cursor(FALSE, FALSE);
+	    gui_may_flush();
+	    screen_cur_col = gui.col;
+	    screen_cur_row = gui.row;
+	}
+	else
+	    out_flush();
+	gui_update_scrollbars(FALSE);
+    }
+#endif
+    return OK;
+}
+
+/*
+ * Redraw the status line of window wp.
+ *
+ * If inversion is possible we use it. Else '=' characters are used.
+ * If "ignore_pum" is TRUE, also redraw statusline when the popup menu is
+ * displayed.
+ */
+    void
+win_redr_status(win_T *wp, int ignore_pum UNUSED)
+{
+    int		row;
+    char_u	*p;
+    int		len;
+    int		fillchar;
+    int		attr;
+    int		this_ru_col;
+    static int  busy = FALSE;
+
+    // It's possible to get here recursively when 'statusline' (indirectly)
+    // invokes ":redrawstatus".  Simply ignore the call then.
+    if (busy)
+	return;
+    busy = TRUE;
+
+    wp->w_redr_status = FALSE;
+    if (wp->w_status_height == 0)
+    {
+	// no status line, can only be last window
+	redraw_cmdline = TRUE;
+    }
+    else if (!redrawing()
+	    // don't update status line when popup menu is visible and may be
+	    // drawn over it, unless it will be redrawn later
+	    || (!ignore_pum && pum_visible()))
+    {
+	// Don't redraw right now, do it later.
+	wp->w_redr_status = TRUE;
+    }
+#ifdef FEAT_STL_OPT
+    else if (*p_stl != NUL || *wp->w_p_stl != NUL)
+    {
+	// redraw custom status line
+	redraw_custom_statusline(wp);
+    }
+#endif
+    else
+    {
+	fillchar = fillchar_status(&attr, wp);
+
+	get_trans_bufname(wp->w_buffer);
+	p = NameBuff;
+	len = (int)STRLEN(p);
+
+	if (bt_help(wp->w_buffer)
+#ifdef FEAT_QUICKFIX
+		|| wp->w_p_pvw
+#endif
+		|| bufIsChanged(wp->w_buffer)
+		|| wp->w_buffer->b_p_ro)
+	    *(p + len++) = ' ';
+	if (bt_help(wp->w_buffer))
+	{
+	    STRCPY(p + len, _("[Help]"));
+	    len += (int)STRLEN(p + len);
+	}
+#ifdef FEAT_QUICKFIX
+	if (wp->w_p_pvw)
+	{
+	    STRCPY(p + len, _("[Preview]"));
+	    len += (int)STRLEN(p + len);
+	}
+#endif
+	if (bufIsChanged(wp->w_buffer)
+#ifdef FEAT_TERMINAL
+		&& !bt_terminal(wp->w_buffer)
+#endif
+		)
+	{
+	    STRCPY(p + len, "[+]");
+	    len += 3;
+	}
+	if (wp->w_buffer->b_p_ro)
+	{
+	    STRCPY(p + len, _("[RO]"));
+	    len += (int)STRLEN(p + len);
+	}
+
+	this_ru_col = ru_col - (Columns - wp->w_width);
+	if (this_ru_col < (wp->w_width + 1) / 2)
+	    this_ru_col = (wp->w_width + 1) / 2;
+	if (this_ru_col <= 1)
+	{
+	    p = (char_u *)"<";		// No room for file name!
+	    len = 1;
+	}
+	else if (has_mbyte)
+	{
+	    int	clen = 0, i;
+
+	    // Count total number of display cells.
+	    clen = mb_string2cells(p, -1);
+
+	    // Find first character that will fit.
+	    // Going from start to end is much faster for DBCS.
+	    for (i = 0; p[i] != NUL && clen >= this_ru_col - 1;
+		    i += (*mb_ptr2len)(p + i))
+		clen -= (*mb_ptr2cells)(p + i);
+	    len = clen;
+	    if (i > 0)
+	    {
+		p = p + i - 1;
+		*p = '<';
+		++len;
+	    }
+
+	}
+	else if (len > this_ru_col - 1)
+	{
+	    p += len - (this_ru_col - 1);
+	    *p = '<';
+	    len = this_ru_col - 1;
+	}
+
+	row = W_WINROW(wp) + wp->w_height;
+	screen_puts(p, row, wp->w_wincol, attr);
+	screen_fill(row, row + 1, len + wp->w_wincol,
+			this_ru_col + wp->w_wincol, fillchar, fillchar, attr);
+
+	if (get_keymap_str(wp, (char_u *)"<%s>", NameBuff, MAXPATHL)
+		&& (int)(this_ru_col - len) > (int)(STRLEN(NameBuff) + 1))
+	    screen_puts(NameBuff, row, (int)(this_ru_col - STRLEN(NameBuff)
+						   - 1 + wp->w_wincol), attr);
+
+#ifdef FEAT_CMDL_INFO
+	win_redr_ruler(wp, TRUE, ignore_pum);
+#endif
+    }
+
+    /*
+     * May need to draw the character below the vertical separator.
+     */
+    if (wp->w_vsep_width != 0 && wp->w_status_height != 0 && redrawing())
+    {
+	if (stl_connected(wp))
+	    fillchar = fillchar_status(&attr, wp);
+	else
+	    fillchar = fillchar_vsep(&attr);
+	screen_putchar(fillchar, W_WINROW(wp) + wp->w_height, W_ENDCOL(wp),
+									attr);
+    }
+    busy = FALSE;
+}
+
+#ifdef FEAT_STL_OPT
+/*
+ * Redraw the status line according to 'statusline' and take care of any
+ * errors encountered.
+ */
+    static void
+redraw_custom_statusline(win_T *wp)
+{
+    static int	    entered = FALSE;
+    int		    saved_did_emsg = did_emsg;
+
+    // When called recursively return.  This can happen when the statusline
+    // contains an expression that triggers a redraw.
+    if (entered)
+	return;
+    entered = TRUE;
+
+    did_emsg = FALSE;
+    win_redr_custom(wp, FALSE);
+    if (did_emsg)
+    {
+	// When there is an error disable the statusline, otherwise the
+	// display is messed up with errors and a redraw triggers the problem
+	// again and again.
+	set_string_option_direct((char_u *)"statusline", -1,
+		(char_u *)"", OPT_FREE | (*wp->w_p_stl != NUL
+					? OPT_LOCAL : OPT_GLOBAL), SID_ERROR);
+    }
+    did_emsg |= saved_did_emsg;
+    entered = FALSE;
+}
+#endif
+
+/*
+ * Show current status info in ruler and various other places
+ * If always is FALSE, only show ruler if position has changed.
+ */
+    void
+showruler(int always)
+{
+    if (!always && !redrawing())
+	return;
+    if (pum_visible())
+    {
+	// Don't redraw right now, do it later.
+	curwin->w_redr_status = TRUE;
+	return;
+    }
+#if defined(FEAT_STL_OPT)
+    if ((*p_stl != NUL || *curwin->w_p_stl != NUL) && curwin->w_status_height)
+	redraw_custom_statusline(curwin);
+    else
+#endif
+#ifdef FEAT_CMDL_INFO
+	win_redr_ruler(curwin, always, FALSE);
+#endif
+
+#ifdef FEAT_TITLE
+    if (need_maketitle
+# ifdef FEAT_STL_OPT
+	    || (p_icon && (stl_syntax & STL_IN_ICON))
+	    || (p_title && (stl_syntax & STL_IN_TITLE))
+# endif
+       )
+	maketitle();
+#endif
+    // Redraw the tab pages line if needed.
+    if (redraw_tabline)
+	draw_tabline();
+}
+
+#if defined(FEAT_CMDL_INFO) || defined(PROTO)
+    void
+win_redr_ruler(win_T *wp, int always, int ignore_pum)
+{
+#define RULER_BUF_LEN 70
+    char_u	buffer[RULER_BUF_LEN];
+    int		row;
+    int		fillchar;
+    int		attr;
+    int		empty_line = FALSE;
+    colnr_T	virtcol;
+    int		i;
+    size_t	len;
+    int		o;
+    int		this_ru_col;
+    int		off = 0;
+    int		width;
+
+    // If 'ruler' off or redrawing disabled, don't do anything
+    if (!p_ru)
+	return;
+
+    /*
+     * Check if cursor.lnum is valid, since win_redr_ruler() may be called
+     * after deleting lines, before cursor.lnum is corrected.
+     */
+    if (wp->w_cursor.lnum > wp->w_buffer->b_ml.ml_line_count)
+	return;
+
+    // Don't draw the ruler while doing insert-completion, it might overwrite
+    // the (long) mode message.
+    if (wp == lastwin && lastwin->w_status_height == 0)
+	if (edit_submode != NULL)
+	    return;
+    // Don't draw the ruler when the popup menu is visible, it may overlap.
+    // Except when the popup menu will be redrawn anyway.
+    if (!ignore_pum && pum_visible())
+	return;
+
+#ifdef FEAT_STL_OPT
+    if (*p_ruf)
+    {
+	int	save_called_emsg = called_emsg;
+
+	called_emsg = FALSE;
+	win_redr_custom(wp, TRUE);
+	if (called_emsg)
+	    set_string_option_direct((char_u *)"rulerformat", -1,
+					   (char_u *)"", OPT_FREE, SID_ERROR);
+	called_emsg |= save_called_emsg;
+	return;
+    }
+#endif
+
+    /*
+     * Check if not in Insert mode and the line is empty (will show "0-1").
+     */
+    if (!(State & INSERT)
+		&& *ml_get_buf(wp->w_buffer, wp->w_cursor.lnum, FALSE) == NUL)
+	empty_line = TRUE;
+
+    /*
+     * Only draw the ruler when something changed.
+     */
+    validate_virtcol_win(wp);
+    if (       redraw_cmdline
+	    || always
+	    || wp->w_cursor.lnum != wp->w_ru_cursor.lnum
+	    || wp->w_cursor.col != wp->w_ru_cursor.col
+	    || wp->w_virtcol != wp->w_ru_virtcol
+	    || wp->w_cursor.coladd != wp->w_ru_cursor.coladd
+	    || wp->w_topline != wp->w_ru_topline
+	    || wp->w_buffer->b_ml.ml_line_count != wp->w_ru_line_count
+#ifdef FEAT_DIFF
+	    || wp->w_topfill != wp->w_ru_topfill
+#endif
+	    || empty_line != wp->w_ru_empty)
+    {
+	cursor_off();
+	if (wp->w_status_height)
+	{
+	    row = W_WINROW(wp) + wp->w_height;
+	    fillchar = fillchar_status(&attr, wp);
+	    off = wp->w_wincol;
+	    width = wp->w_width;
+	}
+	else
+	{
+	    row = Rows - 1;
+	    fillchar = ' ';
+	    attr = 0;
+	    width = Columns;
+	    off = 0;
+	}
+
+	// In list mode virtcol needs to be recomputed
+	virtcol = wp->w_virtcol;
+	if (wp->w_p_list && lcs_tab1 == NUL)
+	{
+	    wp->w_p_list = FALSE;
+	    getvvcol(wp, &wp->w_cursor, NULL, &virtcol, NULL);
+	    wp->w_p_list = TRUE;
+	}
+
+	/*
+	 * Some sprintfs return the length, some return a pointer.
+	 * To avoid portability problems we use strlen() here.
+	 */
+	vim_snprintf((char *)buffer, RULER_BUF_LEN, "%ld,",
+		(wp->w_buffer->b_ml.ml_flags & ML_EMPTY)
+		    ? 0L
+		    : (long)(wp->w_cursor.lnum));
+	len = STRLEN(buffer);
+	col_print(buffer + len, RULER_BUF_LEN - len,
+			empty_line ? 0 : (int)wp->w_cursor.col + 1,
+			(int)virtcol + 1);
+
+	/*
+	 * Add a "50%" if there is room for it.
+	 * On the last line, don't print in the last column (scrolls the
+	 * screen up on some terminals).
+	 */
+	i = (int)STRLEN(buffer);
+	get_rel_pos(wp, buffer + i + 1, RULER_BUF_LEN - i - 1);
+	o = i + vim_strsize(buffer + i + 1);
+	if (wp->w_status_height == 0)	// can't use last char of screen
+	    ++o;
+	this_ru_col = ru_col - (Columns - width);
+	if (this_ru_col < 0)
+	    this_ru_col = 0;
+	// Never use more than half the window/screen width, leave the other
+	// half for the filename.
+	if (this_ru_col < (width + 1) / 2)
+	    this_ru_col = (width + 1) / 2;
+	if (this_ru_col + o < width)
+	{
+	    // need at least 3 chars left for get_rel_pos() + NUL
+	    while (this_ru_col + o < width && RULER_BUF_LEN > i + 4)
+	    {
+		if (has_mbyte)
+		    i += (*mb_char2bytes)(fillchar, buffer + i);
+		else
+		    buffer[i++] = fillchar;
+		++o;
+	    }
+	    get_rel_pos(wp, buffer + i, RULER_BUF_LEN - i);
+	}
+	// Truncate at window boundary.
+	if (has_mbyte)
+	{
+	    o = 0;
+	    for (i = 0; buffer[i] != NUL; i += (*mb_ptr2len)(buffer + i))
+	    {
+		o += (*mb_ptr2cells)(buffer + i);
+		if (this_ru_col + o > width)
+		{
+		    buffer[i] = NUL;
+		    break;
+		}
+	    }
+	}
+	else if (this_ru_col + (int)STRLEN(buffer) > width)
+	    buffer[width - this_ru_col] = NUL;
+
+	screen_puts(buffer, row, this_ru_col + off, attr);
+	i = redraw_cmdline;
+	screen_fill(row, row + 1,
+		this_ru_col + off + (int)STRLEN(buffer),
+		(int)(off + width),
+		fillchar, fillchar, attr);
+	// don't redraw the cmdline because of showing the ruler
+	redraw_cmdline = i;
+	wp->w_ru_cursor = wp->w_cursor;
+	wp->w_ru_virtcol = wp->w_virtcol;
+	wp->w_ru_empty = empty_line;
+	wp->w_ru_topline = wp->w_topline;
+	wp->w_ru_line_count = wp->w_buffer->b_ml.ml_line_count;
+#ifdef FEAT_DIFF
+	wp->w_ru_topfill = wp->w_topfill;
+#endif
+    }
+}
+#endif
+
+/*
+ * To be called when "updating_screen" was set before and now the postponed
+ * side effects may take place.
+ */
+    void
+after_updating_screen(int may_resize_shell UNUSED)
+{
+    updating_screen = FALSE;
+#ifdef FEAT_GUI
+    if (may_resize_shell)
+	gui_may_resize_shell();
+#endif
+#ifdef FEAT_TERMINAL
+    term_check_channel_closed_recently();
+#endif
+
+#ifdef HAVE_DROP_FILE
+    // If handle_drop() was called while updating_screen was TRUE need to
+    // handle the drop now.
+    handle_any_postponed_drop();
+#endif
+}
+
+/*
+ * Update all windows that are editing the current buffer.
+ */
+    void
+update_curbuf(int type)
+{
+    redraw_curbuf_later(type);
+    update_screen(type);
+}
+
+#if defined(FEAT_MENU) || defined(FEAT_FOLDING)
+/*
+ * Copy "text" to ScreenLines using "attr".
+ * Returns the next screen column.
+ */
+    static int
+text_to_screenline(win_T *wp, char_u *text, int col)
+{
+    int		off = (int)(current_ScreenLine - ScreenLines);
+
+    if (has_mbyte)
+    {
+	int	cells;
+	int	u8c, u8cc[MAX_MCO];
+	int	i;
+	int	idx;
+	int	c_len;
+	char_u	*p;
+# ifdef FEAT_ARABIC
+	int	prev_c = 0;		// previous Arabic character
+	int	prev_c1 = 0;		// first composing char for prev_c
+# endif
+
+# ifdef FEAT_RIGHTLEFT
+	if (wp->w_p_rl)
+	    idx = off;
+	else
+# endif
+	    idx = off + col;
+
+	// Store multibyte characters in ScreenLines[] et al. correctly.
+	for (p = text; *p != NUL; )
+	{
+	    cells = (*mb_ptr2cells)(p);
+	    c_len = (*mb_ptr2len)(p);
+	    if (col + cells > wp->w_width
+# ifdef FEAT_RIGHTLEFT
+		    - (wp->w_p_rl ? col : 0)
+# endif
+		    )
+		break;
+	    ScreenLines[idx] = *p;
+	    if (enc_utf8)
+	    {
+		u8c = utfc_ptr2char(p, u8cc);
+		if (*p < 0x80 && u8cc[0] == 0)
+		{
+		    ScreenLinesUC[idx] = 0;
+#ifdef FEAT_ARABIC
+		    prev_c = u8c;
+#endif
+		}
+		else
+		{
+#ifdef FEAT_ARABIC
+		    if (p_arshape && !p_tbidi && ARABIC_CHAR(u8c))
+		    {
+			// Do Arabic shaping.
+			int	pc, pc1, nc;
+			int	pcc[MAX_MCO];
+			int	firstbyte = *p;
+
+			// The idea of what is the previous and next
+			// character depends on 'rightleft'.
+			if (wp->w_p_rl)
+			{
+			    pc = prev_c;
+			    pc1 = prev_c1;
+			    nc = utf_ptr2char(p + c_len);
+			    prev_c1 = u8cc[0];
+			}
+			else
+			{
+			    pc = utfc_ptr2char(p + c_len, pcc);
+			    nc = prev_c;
+			    pc1 = pcc[0];
+			}
+			prev_c = u8c;
+
+			u8c = arabic_shape(u8c, &firstbyte, &u8cc[0],
+								 pc, pc1, nc);
+			ScreenLines[idx] = firstbyte;
+		    }
+		    else
+			prev_c = u8c;
+#endif
+		    // Non-BMP character: display as ? or fullwidth ?.
+		    ScreenLinesUC[idx] = u8c;
+		    for (i = 0; i < Screen_mco; ++i)
+		    {
+			ScreenLinesC[i][idx] = u8cc[i];
+			if (u8cc[i] == 0)
+			    break;
+		    }
+		}
+		if (cells > 1)
+		    ScreenLines[idx + 1] = 0;
+	    }
+	    else if (enc_dbcs == DBCS_JPNU && *p == 0x8e)
+		// double-byte single width character
+		ScreenLines2[idx] = p[1];
+	    else if (cells > 1)
+		// double-width character
+		ScreenLines[idx + 1] = p[1];
+	    col += cells;
+	    idx += cells;
+	    p += c_len;
+	}
+    }
+    else
+    {
+	int len = (int)STRLEN(text);
+
+	if (len > wp->w_width - col)
+	    len = wp->w_width - col;
+	if (len > 0)
+	{
+#ifdef FEAT_RIGHTLEFT
+	    if (wp->w_p_rl)
+		mch_memmove(current_ScreenLine, text, len);
+	    else
+#endif
+		mch_memmove(current_ScreenLine + col, text, len);
+	    col += len;
+	}
+    }
+    return col;
+}
+#endif
+
+#ifdef FEAT_MENU
+/*
+ * Draw the window toolbar.
+ */
+    static void
+redraw_win_toolbar(win_T *wp)
+{
+    vimmenu_T	*menu;
+    int		item_idx = 0;
+    int		item_count = 0;
+    int		col = 0;
+    int		next_col;
+    int		off = (int)(current_ScreenLine - ScreenLines);
+    int		fill_attr = syn_name2attr((char_u *)"ToolbarLine");
+    int		button_attr = syn_name2attr((char_u *)"ToolbarButton");
+
+    vim_free(wp->w_winbar_items);
+    for (menu = wp->w_winbar->children; menu != NULL; menu = menu->next)
+	++item_count;
+    wp->w_winbar_items = ALLOC_CLEAR_MULT(winbar_item_T, item_count + 1);
+
+    // TODO: use fewer spaces if there is not enough room
+    for (menu = wp->w_winbar->children;
+			  menu != NULL && col < wp->w_width; menu = menu->next)
+    {
+	space_to_screenline(off + col, fill_attr);
+	if (++col >= wp->w_width)
+	    break;
+	if (col > 1)
+	{
+	    space_to_screenline(off + col, fill_attr);
+	    if (++col >= wp->w_width)
+		break;
+	}
+
+	wp->w_winbar_items[item_idx].wb_startcol = col;
+	space_to_screenline(off + col, button_attr);
+	if (++col >= wp->w_width)
+	    break;
+
+	next_col = text_to_screenline(wp, menu->name, col);
+	while (col < next_col)
+	{
+	    ScreenAttrs[off + col] = button_attr;
+	    ++col;
+	}
+	wp->w_winbar_items[item_idx].wb_endcol = col;
+	wp->w_winbar_items[item_idx].wb_menu = menu;
+	++item_idx;
+
+	if (col >= wp->w_width)
+	    break;
+	space_to_screenline(off + col, button_attr);
+	++col;
+    }
+    while (col < wp->w_width)
+    {
+	space_to_screenline(off + col, fill_attr);
+	++col;
+    }
+    wp->w_winbar_items[item_idx].wb_menu = NULL; // end marker
+
+    screen_line(wp->w_winrow, wp->w_wincol, (int)wp->w_width,
+							  (int)wp->w_width, 0);
+}
+#endif
+
+#if defined(FEAT_FOLDING) || defined(PROTO)
+/*
+ * Copy "buf[len]" to ScreenLines["off"] and set attributes to "attr".
+ */
+    static void
+copy_text_attr(
+    int		off,
+    char_u	*buf,
+    int		len,
+    int		attr)
+{
+    int		i;
+
+    mch_memmove(ScreenLines + off, buf, (size_t)len);
+    if (enc_utf8)
+	vim_memset(ScreenLinesUC + off, 0, sizeof(u8char_T) * (size_t)len);
+    for (i = 0; i < len; ++i)
+	ScreenAttrs[off + i] = attr;
+}
+
+/*
+ * Display one folded line.
+ */
+    static void
+fold_line(
+    win_T	*wp,
+    long	fold_count,
+    foldinfo_T	*foldinfo,
+    linenr_T	lnum,
+    int		row)
+{
+    char_u	buf[FOLD_TEXT_LEN];
+    pos_T	*top, *bot;
+    linenr_T	lnume = lnum + fold_count - 1;
+    int		len;
+    char_u	*text;
+    int		fdc;
+    int		col;
+    int		txtcol;
+    int		off = (int)(current_ScreenLine - ScreenLines);
+    int		ri;
+
+    // Build the fold line:
+    // 1. Add the cmdwin_type for the command-line window
+    // 2. Add the 'foldcolumn'
+    // 3. Add the 'number' or 'relativenumber' column
+    // 4. Compose the text
+    // 5. Add the text
+    // 6. set highlighting for the Visual area an other text
+    col = 0;
+
+    // 1. Add the cmdwin_type for the command-line window
+    // Ignores 'rightleft', this window is never right-left.
+#ifdef FEAT_CMDWIN
+    if (cmdwin_type != 0 && wp == curwin)
+    {
+	ScreenLines[off] = cmdwin_type;
+	ScreenAttrs[off] = HL_ATTR(HLF_AT);
+	if (enc_utf8)
+	    ScreenLinesUC[off] = 0;
+	++col;
+    }
+#endif
+
+    // 2. Add the 'foldcolumn'
+    //    Reduce the width when there is not enough space.
+    fdc = compute_foldcolumn(wp, col);
+    if (fdc > 0)
+    {
+	fill_foldcolumn(buf, wp, TRUE, lnum);
+#ifdef FEAT_RIGHTLEFT
+	if (wp->w_p_rl)
+	{
+	    int		i;
+
+	    copy_text_attr(off + wp->w_width - fdc - col, buf, fdc,
+							     HL_ATTR(HLF_FC));
+	    // reverse the fold column
+	    for (i = 0; i < fdc; ++i)
+		ScreenLines[off + wp->w_width - i - 1 - col] = buf[i];
+	}
+	else
+#endif
+	    copy_text_attr(off + col, buf, fdc, HL_ATTR(HLF_FC));
+	col += fdc;
+    }
+
+#ifdef FEAT_RIGHTLEFT
+# define RL_MEMSET(p, v, l) \
+    do { \
+	if (wp->w_p_rl) \
+	    for (ri = 0; ri < l; ++ri) \
+	       ScreenAttrs[off + (wp->w_width - (p) - (l)) + ri] = v; \
+	 else \
+	    for (ri = 0; ri < l; ++ri) \
+	       ScreenAttrs[off + (p) + ri] = v; \
+    } while (0)
+#else
+# define RL_MEMSET(p, v, l) \
+    do { \
+	for (ri = 0; ri < l; ++ri) \
+	    ScreenAttrs[off + (p) + ri] = v; \
+    } while (0)
+#endif
+
+    // Set all attributes of the 'number' or 'relativenumber' column and the
+    // text
+    RL_MEMSET(col, HL_ATTR(HLF_FL), wp->w_width - col);
+
+#ifdef FEAT_SIGNS
+    // If signs are being displayed, add two spaces.
+    if (signcolumn_on(wp))
+    {
+	len = wp->w_width - col;
+	if (len > 0)
+	{
+	    if (len > 2)
+		len = 2;
+# ifdef FEAT_RIGHTLEFT
+	    if (wp->w_p_rl)
+		// the line number isn't reversed
+		copy_text_attr(off + wp->w_width - len - col,
+					(char_u *)"  ", len, HL_ATTR(HLF_FL));
+	    else
+# endif
+		copy_text_attr(off + col, (char_u *)"  ", len, HL_ATTR(HLF_FL));
+	    col += len;
+	}
+    }
+#endif
+
+    // 3. Add the 'number' or 'relativenumber' column
+    if (wp->w_p_nu || wp->w_p_rnu)
+    {
+	len = wp->w_width - col;
+	if (len > 0)
+	{
+	    int	    w = number_width(wp);
+	    long    num;
+	    char    *fmt = "%*ld ";
+
+	    if (len > w + 1)
+		len = w + 1;
+
+	    if (wp->w_p_nu && !wp->w_p_rnu)
+		// 'number' + 'norelativenumber'
+		num = (long)lnum;
+	    else
+	    {
+		// 'relativenumber', don't use negative numbers
+		num = labs((long)get_cursor_rel_lnum(wp, lnum));
+		if (num == 0 && wp->w_p_nu && wp->w_p_rnu)
+		{
+		    // 'number' + 'relativenumber': cursor line shows absolute
+		    // line number
+		    num = lnum;
+		    fmt = "%-*ld ";
+		}
+	    }
+
+	    sprintf((char *)buf, fmt, w, num);
+#ifdef FEAT_RIGHTLEFT
+	    if (wp->w_p_rl)
+		// the line number isn't reversed
+		copy_text_attr(off + wp->w_width - len - col