Adding upstream version 2:9.0.1378.upstream/2%9.0.1378upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2282 insertions, 0 deletions

diff --git a/src/indent.c b/src/indent.c
new file mode 100644
index 0000000..be4d563
--- /dev/null
+++ b/src/indent.c
@@ -0,0 +1,2282 @@
+/* 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.
+ */
+
+/*
+ * indent.c: Indentation related functions
+ */
+
+#include "vim.h"
+
+#if defined(FEAT_VARTABS) || defined(PROTO)
+
+/*
+ * Set the integer values corresponding to the string setting of 'vartabstop'.
+ * "array" will be set, caller must free it if needed.
+ * Return FAIL for an error.
+ */
+    int
+tabstop_set(char_u *var, int **array)
+{
+    int	    valcount = 1;
+    int	    t;
+    char_u  *cp;
+
+    if (var[0] == NUL || (var[0] == '0' && var[1] == NUL))
+    {
+	*array = NULL;
+	return OK;
+    }
+
+    for (cp = var; *cp != NUL; ++cp)
+    {
+	if (cp == var || cp[-1] == ',')
+	{
+	    char_u *end;
+
+	    if (strtol((char *)cp, (char **)&end, 10) <= 0)
+	    {
+		if (cp != end)
+		    emsg(_(e_argument_must_be_positive));
+		else
+		    semsg(_(e_invalid_argument_str), cp);
+		return FAIL;
+	    }
+	}
+
+	if (VIM_ISDIGIT(*cp))
+	    continue;
+	if (cp[0] == ',' && cp > var && cp[-1] != ',' && cp[1] != NUL)
+	{
+	    ++valcount;
+	    continue;
+	}
+	semsg(_(e_invalid_argument_str), var);
+	return FAIL;
+    }
+
+    *array = ALLOC_MULT(int, valcount + 1);
+    if (*array == NULL)
+	return FAIL;
+    (*array)[0] = valcount;
+
+    t = 1;
+    for (cp = var; *cp != NUL;)
+    {
+	int n = atoi((char *)cp);
+
+	// Catch negative values, overflow and ridiculous big values.
+	if (n <= 0 || n > TABSTOP_MAX)
+	{
+	    semsg(_(e_invalid_argument_str), cp);
+	    vim_free(*array);
+	    *array = NULL;
+	    return FAIL;
+	}
+	(*array)[t++] = n;
+	while (*cp != NUL && *cp != ',')
+	    ++cp;
+	if (*cp != NUL)
+	    ++cp;
+    }
+
+    return OK;
+}
+
+/*
+ * Calculate the number of screen spaces a tab will occupy.
+ * If "vts" is set then the tab widths are taken from that array,
+ * otherwise the value of ts is used.
+ */
+    int
+tabstop_padding(colnr_T col, int ts_arg, int *vts)
+{
+    int		ts = ts_arg == 0 ? 8 : ts_arg;
+    int		tabcount;
+    colnr_T	tabcol = 0;
+    int		t;
+    int		padding = 0;
+
+    if (vts == NULL || vts[0] == 0)
+	return ts - (col % ts);
+
+    tabcount = vts[0];
+
+    for (t = 1; t <= tabcount; ++t)
+    {
+	tabcol += vts[t];
+	if (tabcol > col)
+	{
+	    padding = (int)(tabcol - col);
+	    break;
+	}
+    }
+    if (t > tabcount)
+	padding = vts[tabcount] - (int)((col - tabcol) % vts[tabcount]);
+
+    return padding;
+}
+
+/*
+ * Find the size of the tab that covers a particular column.
+ */
+    int
+tabstop_at(colnr_T col, int ts, int *vts)
+{
+    int		tabcount;
+    colnr_T	tabcol = 0;
+    int		t;
+    int		tab_size = 0;
+
+    if (vts == 0 || vts[0] == 0)
+	return ts;
+
+    tabcount = vts[0];
+    for (t = 1; t <= tabcount; ++t)
+    {
+	tabcol += vts[t];
+	if (tabcol > col)
+	{
+	    tab_size = vts[t];
+	    break;
+	}
+    }
+    if (t > tabcount)
+	tab_size = vts[tabcount];
+
+    return tab_size;
+}
+
+/*
+ * Find the column on which a tab starts.
+ */
+    colnr_T
+tabstop_start(colnr_T col, int ts, int *vts)
+{
+    int		tabcount;
+    colnr_T	tabcol = 0;
+    int		t;
+    int		excess;
+
+    if (vts == NULL || vts[0] == 0)
+	return (col / ts) * ts;
+
+    tabcount = vts[0];
+    for (t = 1; t <= tabcount; ++t)
+    {
+	tabcol += vts[t];
+	if (tabcol > col)
+	    return tabcol - vts[t];
+    }
+
+    excess = tabcol % vts[tabcount];
+    return excess + ((col - excess) / vts[tabcount]) * vts[tabcount];
+}
+
+/*
+ * Find the number of tabs and spaces necessary to get from one column
+ * to another.
+ */
+    void
+tabstop_fromto(
+	colnr_T start_col,
+	colnr_T end_col,
+	int	ts_arg,
+	int	*vts,
+	int	*ntabs,
+	int	*nspcs)
+{
+    int		spaces = end_col - start_col;
+    colnr_T	tabcol = 0;
+    int		padding = 0;
+    int		tabcount;
+    int		t;
+    int		ts = ts_arg == 0 ? curbuf->b_p_ts : ts_arg;
+
+    if (vts == NULL || vts[0] == 0)
+    {
+	int tabs = 0;
+	int initspc = 0;
+
+	initspc = ts - (start_col % ts);
+	if (spaces >= initspc)
+	{
+	    spaces -= initspc;
+	    tabs++;
+	}
+	tabs += spaces / ts;
+	spaces -= (spaces / ts) * ts;
+
+	*ntabs = tabs;
+	*nspcs = spaces;
+	return;
+    }
+
+    // Find the padding needed to reach the next tabstop.
+    tabcount = vts[0];
+    for (t = 1; t <= tabcount; ++t)
+    {
+	tabcol += vts[t];
+	if (tabcol > start_col)
+	{
+	    padding = (int)(tabcol - start_col);
+	    break;
+	}
+    }
+    if (t > tabcount)
+	padding = vts[tabcount] - (int)((start_col - tabcol) % vts[tabcount]);
+
+    // If the space needed is less than the padding no tabs can be used.
+    if (spaces < padding)
+    {
+	*ntabs = 0;
+	*nspcs = spaces;
+	return;
+    }
+
+    *ntabs = 1;
+    spaces -= padding;
+
+    // At least one tab has been used. See if any more will fit.
+    while (spaces != 0 && ++t <= tabcount)
+    {
+	padding = vts[t];
+	if (spaces < padding)
+	{
+	    *nspcs = spaces;
+	    return;
+	}
+	++*ntabs;
+	spaces -= padding;
+    }
+
+    *ntabs += spaces / vts[tabcount];
+    *nspcs =  spaces % vts[tabcount];
+}
+
+/*
+ * See if two tabstop arrays contain the same values.
+ */
+    static int
+tabstop_eq(int *ts1, int *ts2)
+{
+    int		t;
+
+    if ((ts1 == 0 && ts2) || (ts1 && ts2 == 0))
+	return FALSE;
+    if (ts1 == ts2)
+	return TRUE;
+    if (ts1[0] != ts2[0])
+	return FALSE;
+
+    for (t = 1; t <= ts1[0]; ++t)
+	if (ts1[t] != ts2[t])
+	    return FALSE;
+
+    return TRUE;
+}
+
+# if defined(FEAT_BEVAL) || defined(PROTO)
+/*
+ * Copy a tabstop array, allocating space for the new array.
+ */
+    int *
+tabstop_copy(int *oldts)
+{
+    int		*newts;
+    int		t;
+
+    if (oldts == NULL)
+	return NULL;
+    newts = ALLOC_MULT(int, oldts[0] + 1);
+    if (newts != NULL)
+	for (t = 0; t <= oldts[0]; ++t)
+	    newts[t] = oldts[t];
+    return newts;
+}
+# endif
+
+/*
+ * Return a count of the number of tabstops.
+ */
+    int
+tabstop_count(int *ts)
+{
+    return ts != NULL ? ts[0] : 0;
+}
+
+/*
+ * Return the first tabstop, or 8 if there are no tabstops defined.
+ */
+    int
+tabstop_first(int *ts)
+{
+    return ts != NULL ? ts[1] : 8;
+}
+
+#endif
+
+/*
+ * Return the effective shiftwidth value for current buffer, using the
+ * 'tabstop' value when 'shiftwidth' is zero.
+ */
+    long
+get_sw_value(buf_T *buf)
+{
+    return get_sw_value_col(buf, 0);
+}
+
+/*
+ * Idem, using "pos".
+ */
+    static long
+get_sw_value_pos(buf_T *buf, pos_T *pos)
+{
+    pos_T save_cursor = curwin->w_cursor;
+    long sw_value;
+
+    curwin->w_cursor = *pos;
+    sw_value = get_sw_value_col(buf, get_nolist_virtcol());
+    curwin->w_cursor = save_cursor;
+    return sw_value;
+}
+
+/*
+ * Idem, using the first non-black in the current line.
+ */
+    long
+get_sw_value_indent(buf_T *buf)
+{
+    pos_T pos = curwin->w_cursor;
+
+    pos.col = getwhitecols_curline();
+    return get_sw_value_pos(buf, &pos);
+}
+
+/*
+ * Idem, using virtual column "col".
+ */
+    long
+get_sw_value_col(buf_T *buf, colnr_T col UNUSED)
+{
+    return buf->b_p_sw ? buf->b_p_sw :
+#ifdef FEAT_VARTABS
+	tabstop_at(col, buf->b_p_ts, buf->b_p_vts_array);
+#else
+	buf->b_p_ts;
+#endif
+}
+
+/*
+ * Return the effective softtabstop value for the current buffer, using the
+ * 'shiftwidth' value when 'softtabstop' is negative.
+ */
+    long
+get_sts_value(void)
+{
+    return curbuf->b_p_sts < 0 ? get_sw_value(curbuf) : curbuf->b_p_sts;
+}
+
+/*
+ * Count the size (in window cells) of the indent in the current line.
+ */
+    int
+get_indent(void)
+{
+#ifdef FEAT_VARTABS
+    return get_indent_str_vtab(ml_get_curline(), (int)curbuf->b_p_ts,
+						 curbuf->b_p_vts_array, FALSE);
+#else
+    return get_indent_str(ml_get_curline(), (int)curbuf->b_p_ts, FALSE);
+#endif
+}
+
+/*
+ * Count the size (in window cells) of the indent in line "lnum".
+ */
+    int
+get_indent_lnum(linenr_T lnum)
+{
+#ifdef FEAT_VARTABS
+    return get_indent_str_vtab(ml_get(lnum), (int)curbuf->b_p_ts,
+						 curbuf->b_p_vts_array, FALSE);
+#else
+    return get_indent_str(ml_get(lnum), (int)curbuf->b_p_ts, FALSE);
+#endif
+}
+
+#if defined(FEAT_FOLDING) || defined(PROTO)
+/*
+ * Count the size (in window cells) of the indent in line "lnum" of buffer
+ * "buf".
+ */
+    int
+get_indent_buf(buf_T *buf, linenr_T lnum)
+{
+# ifdef FEAT_VARTABS
+    return get_indent_str_vtab(ml_get_buf(buf, lnum, FALSE),
+			       (int)buf->b_p_ts, buf->b_p_vts_array, FALSE);
+# else
+    return get_indent_str(ml_get_buf(buf, lnum, FALSE), (int)buf->b_p_ts, FALSE);
+# endif
+}
+#endif
+
+/*
+ * count the size (in window cells) of the indent in line "ptr", with
+ * 'tabstop' at "ts"
+ */
+    int
+get_indent_str(
+    char_u	*ptr,
+    int		ts,
+    int		list) // if TRUE, count only screen size for tabs
+{
+    int		count = 0;
+
+    for ( ; *ptr; ++ptr)
+    {
+	if (*ptr == TAB)
+	{
+	    if (!list || curwin->w_lcs_chars.tab1)
+		// count a tab for what it is worth
+		count += ts - (count % ts);
+	    else
+		// In list mode, when tab is not set, count screen char width
+		// for Tab, displays: ^I
+		count += ptr2cells(ptr);
+	}
+	else if (*ptr == ' ')
+	    ++count;		// count a space for one
+	else
+	    break;
+    }
+    return count;
+}
+
+#ifdef FEAT_VARTABS
+/*
+ * Count the size (in window cells) of the indent in line "ptr", using
+ * variable tabstops.
+ * if "list" is TRUE, count only screen size for tabs.
+ */
+    int
+get_indent_str_vtab(char_u *ptr, int ts, int *vts, int list)
+{
+    int		count = 0;
+
+    for ( ; *ptr; ++ptr)
+    {
+	if (*ptr == TAB)    // count a tab for what it is worth
+	{
+	    if (!list || curwin->w_lcs_chars.tab1)
+		count += tabstop_padding(count, ts, vts);
+	    else
+		// In list mode, when tab is not set, count screen char width
+		// for Tab, displays: ^I
+		count += ptr2cells(ptr);
+	}
+	else if (*ptr == ' ')
+	    ++count;		// count a space for one
+	else
+	    break;
+    }
+    return count;
+}
+#endif
+
+/*
+ * Set the indent of the current line.
+ * Leaves the cursor on the first non-blank in the line.
+ * Caller must take care of undo.
+ * "flags":
+ *	SIN_CHANGED:	call changed_bytes() if the line was changed.
+ *	SIN_INSERT:	insert the indent in front of the line.
+ *	SIN_UNDO:	save line for undo before changing it.
+ * Returns TRUE if the line was changed.
+ */
+    int
+set_indent(
+    int		size,		    // measured in spaces
+    int		flags)
+{
+    char_u	*p;
+    char_u	*newline;
+    char_u	*oldline;
+    char_u	*s;
+    int		todo;
+    int		ind_len;	    // measured in characters
+    int		line_len;
+    int		doit = FALSE;
+    int		ind_done = 0;	    // measured in spaces
+#ifdef FEAT_VARTABS
+    int		ind_col = 0;
+#endif
+    int		tab_pad;
+    int		retval = FALSE;
+    int		orig_char_len = -1; // number of initial whitespace chars when
+				    // 'et' and 'pi' are both set
+
+    // First check if there is anything to do and compute the number of
+    // characters needed for the indent.
+    todo = size;
+    ind_len = 0;
+    p = oldline = ml_get_curline();
+
+    // Calculate the buffer size for the new indent, and check to see if it
+    // isn't already set
+
+    // if 'expandtab' isn't set: use TABs; if both 'expandtab' and
+    // 'preserveindent' are set count the number of characters at the
+    // beginning of the line to be copied
+    if (!curbuf->b_p_et || (!(flags & SIN_INSERT) && curbuf->b_p_pi))
+    {
+	// If 'preserveindent' is set then reuse as much as possible of
+	// the existing indent structure for the new indent
+	if (!(flags & SIN_INSERT) && curbuf->b_p_pi)
+	{
+	    ind_done = 0;
+
+	    // count as many characters as we can use
+	    while (todo > 0 && VIM_ISWHITE(*p))
+	    {
+		if (*p == TAB)
+		{
+#ifdef FEAT_VARTABS
+		    tab_pad = tabstop_padding(ind_done, curbuf->b_p_ts,
+							curbuf->b_p_vts_array);
+#else
+		    tab_pad = (int)curbuf->b_p_ts
+					   - (ind_done % (int)curbuf->b_p_ts);
+#endif
+		    // stop if this tab will overshoot the target
+		    if (todo < tab_pad)
+			break;
+		    todo -= tab_pad;
+		    ++ind_len;
+		    ind_done += tab_pad;
+		}
+		else
+		{
+		    --todo;
+		    ++ind_len;
+		    ++ind_done;
+		}
+		++p;
+	    }
+
+#ifdef FEAT_VARTABS
+	    // These diverge from this point.
+	    ind_col = ind_done;
+#endif
+	    // Set initial number of whitespace chars to copy if we are
+	    // preserving indent but expandtab is set
+	    if (curbuf->b_p_et)
+		orig_char_len = ind_len;
+
+	    // Fill to next tabstop with a tab, if possible
+#ifdef FEAT_VARTABS
+	    tab_pad = tabstop_padding(ind_done, curbuf->b_p_ts,
+						curbuf->b_p_vts_array);
+#else
+	    tab_pad = (int)curbuf->b_p_ts - (ind_done % (int)curbuf->b_p_ts);
+#endif
+	    if (todo >= tab_pad && orig_char_len == -1)
+	    {
+		doit = TRUE;
+		todo -= tab_pad;
+		++ind_len;
+		// ind_done += tab_pad;
+#ifdef FEAT_VARTABS
+		ind_col += tab_pad;
+#endif
+	    }
+	}
+
+	// count tabs required for indent
+#ifdef FEAT_VARTABS
+	for (;;)
+	{
+	    tab_pad = tabstop_padding(ind_col, curbuf->b_p_ts,
+							curbuf->b_p_vts_array);
+	    if (todo < tab_pad)
+		break;
+	    if (*p != TAB)
+		doit = TRUE;
+	    else
+		++p;
+	    todo -= tab_pad;
+	    ++ind_len;
+	    ind_col += tab_pad;
+	}
+#else
+	while (todo >= (int)curbuf->b_p_ts)
+	{
+	    if (*p != TAB)
+		doit = TRUE;
+	    else
+		++p;
+	    todo -= (int)curbuf->b_p_ts;
+	    ++ind_len;
+	    // ind_done += (int)curbuf->b_p_ts;
+	}
+#endif
+    }
+    // count spaces required for indent
+    while (todo > 0)
+    {
+	if (*p != ' ')
+	    doit = TRUE;
+	else
+	    ++p;
+	--todo;
+	++ind_len;
+	// ++ind_done;
+    }
+
+    // Return if the indent is OK already.
+    if (!doit && !VIM_ISWHITE(*p) && !(flags & SIN_INSERT))
+	return FALSE;
+
+    // Allocate memory for the new line.
+    if (flags & SIN_INSERT)
+	p = oldline;
+    else
+	p = skipwhite(p);
+    line_len = (int)STRLEN(p) + 1;
+
+    // If 'preserveindent' and 'expandtab' are both set keep the original
+    // characters and allocate accordingly.  We will fill the rest with spaces
+    // after the if (!curbuf->b_p_et) below.
+    if (orig_char_len != -1)
+    {
+	newline = alloc(orig_char_len + size - ind_done + line_len);
+	if (newline == NULL)
+	    return FALSE;
+	todo = size - ind_done;
+	ind_len = orig_char_len + todo;    // Set total length of indent in
+					   // characters, which may have been
+					   // undercounted until now
+	p = oldline;
+	s = newline;
+	while (orig_char_len > 0)
+	{
+	    *s++ = *p++;
+	    orig_char_len--;
+	}
+
+	// Skip over any additional white space (useful when newindent is less
+	// than old)
+	while (VIM_ISWHITE(*p))
+	    ++p;
+
+    }
+    else
+    {
+	todo = size;
+	newline = alloc(ind_len + line_len);
+	if (newline == NULL)
+	    return FALSE;
+	s = newline;
+    }
+
+    // Put the characters in the new line.
+    // if 'expandtab' isn't set: use TABs
+    if (!curbuf->b_p_et)
+    {
+	// If 'preserveindent' is set then reuse as much as possible of
+	// the existing indent structure for the new indent
+	if (!(flags & SIN_INSERT) && curbuf->b_p_pi)
+	{
+	    p = oldline;
+	    ind_done = 0;
+
+	    while (todo > 0 && VIM_ISWHITE(*p))
+	    {
+		if (*p == TAB)
+		{
+#ifdef FEAT_VARTABS
+		    tab_pad = tabstop_padding(ind_done, curbuf->b_p_ts,
+							curbuf->b_p_vts_array);
+#else
+		    tab_pad = (int)curbuf->b_p_ts
+					   - (ind_done % (int)curbuf->b_p_ts);
+#endif
+		    // stop if this tab will overshoot the target
+		    if (todo < tab_pad)
+			break;
+		    todo -= tab_pad;
+		    ind_done += tab_pad;
+		}
+		else
+		{
+		    --todo;
+		    ++ind_done;
+		}
+		*s++ = *p++;
+	    }
+
+	    // Fill to next tabstop with a tab, if possible
+#ifdef FEAT_VARTABS
+	    tab_pad = tabstop_padding(ind_done, curbuf->b_p_ts,
+						curbuf->b_p_vts_array);
+#else
+	    tab_pad = (int)curbuf->b_p_ts - (ind_done % (int)curbuf->b_p_ts);
+#endif
+	    if (todo >= tab_pad)
+	    {
+		*s++ = TAB;
+		todo -= tab_pad;
+#ifdef FEAT_VARTABS
+		ind_done += tab_pad;
+#endif
+	    }
+
+	    p = skipwhite(p);
+	}
+
+#ifdef FEAT_VARTABS
+	for (;;)
+	{
+	    tab_pad = tabstop_padding(ind_done, curbuf->b_p_ts,
+							curbuf->b_p_vts_array);
+	    if (todo < tab_pad)
+		break;
+	    *s++ = TAB;
+	    todo -= tab_pad;
+	    ind_done += tab_pad;
+	}
+#else
+	while (todo >= (int)curbuf->b_p_ts)
+	{
+	    *s++ = TAB;
+	    todo -= (int)curbuf->b_p_ts;
+	}
+#endif
+    }
+    while (todo > 0)
+    {
+	*s++ = ' ';
+	--todo;
+    }
+    mch_memmove(s, p, (size_t)line_len);
+
+    // Replace the line (unless undo fails).
+    if (!(flags & SIN_UNDO) || u_savesub(curwin->w_cursor.lnum) == OK)
+    {
+	colnr_T old_offset = (colnr_T)(p - oldline);
+	colnr_T new_offset = (colnr_T)(s - newline);
+
+	// this may free "newline"
+	ml_replace(curwin->w_cursor.lnum, newline, FALSE);
+	if (flags & SIN_CHANGED)
+	    changed_bytes(curwin->w_cursor.lnum, 0);
+
+	// Correct saved cursor position if it is in this line.
+	if (saved_cursor.lnum == curwin->w_cursor.lnum)
+	{
+	    if (saved_cursor.col >= old_offset)
+		// cursor was after the indent, adjust for the number of
+		// bytes added/removed
+		saved_cursor.col += ind_len - old_offset;
+	    else if (saved_cursor.col >= new_offset)
+		// cursor was in the indent, and is now after it, put it back
+		// at the start of the indent (replacing spaces with TAB)
+		saved_cursor.col = new_offset;
+	}
+#ifdef FEAT_PROP_POPUP
+	{
+	    int added = ind_len - old_offset;
+
+	    // When increasing indent this behaves like spaces were inserted at
+	    // the old indent, when decreasing indent it behaves like spaces
+	    // were deleted at the new indent.
+	    adjust_prop_columns(curwin->w_cursor.lnum,
+				  added > 0 ? old_offset : (colnr_T)ind_len,
+				  added, APC_INDENT);
+	}
+#endif
+	retval = TRUE;
+    }
+    else
+	vim_free(newline);
+
+    curwin->w_cursor.col = ind_len;
+    return retval;
+}
+
+/*
+ * Return the indent of the current line after a number.  Return -1 if no
+ * number was found.  Used for 'n' in 'formatoptions': numbered list.
+ * Since a pattern is used it can actually handle more than numbers.
+ */
+    int
+get_number_indent(linenr_T lnum)
+{
+    colnr_T	col;
+    pos_T	pos;
+
+    regmatch_T	regmatch;
+    int		lead_len = 0;	// length of comment leader
+
+    if (lnum > curbuf->b_ml.ml_line_count)
+	return -1;
+    pos.lnum = 0;
+
+    // In format_lines() (i.e. not insert mode), fo+=q is needed too...
+    if ((State & MODE_INSERT) || has_format_option(FO_Q_COMS))
+	lead_len = get_leader_len(ml_get(lnum), NULL, FALSE, TRUE);
+
+    regmatch.regprog = vim_regcomp(curbuf->b_p_flp, RE_MAGIC);
+    if (regmatch.regprog != NULL)
+    {
+	regmatch.rm_ic = FALSE;
+
+	// vim_regexec() expects a pointer to a line.  This lets us
+	// start matching for the flp beyond any comment leader...
+	if (vim_regexec(&regmatch, ml_get(lnum) + lead_len, (colnr_T)0))
+	{
+	    pos.lnum = lnum;
+	    pos.col = (colnr_T)(*regmatch.endp - ml_get(lnum));
+	    pos.coladd = 0;
+	}
+	vim_regfree(regmatch.regprog);
+    }
+
+    if (pos.lnum == 0 || *ml_get_pos(&pos) == NUL)
+	return -1;
+    getvcol(curwin, &pos, &col, NULL, NULL);
+    return (int)col;
+}
+
+#if defined(FEAT_LINEBREAK) || defined(PROTO)
+/*
+ * This is called when 'breakindentopt' is changed and when a window is
+ * initialized.
+ */
+    int
+briopt_check(win_T *wp)
+{
+    char_u	*p;
+    int		bri_shift = 0;
+    long	bri_min = 20;
+    int		bri_sbr = FALSE;
+    int		bri_list = 0;
+    int		bri_vcol = 0;
+
+    p = wp->w_p_briopt;
+    while (*p != NUL)
+    {
+	if (STRNCMP(p, "shift:", 6) == 0
+		 && ((p[6] == '-' && VIM_ISDIGIT(p[7])) || VIM_ISDIGIT(p[6])))
+	{
+	    p += 6;
+	    bri_shift = getdigits(&p);
+	}
+	else if (STRNCMP(p, "min:", 4) == 0 && VIM_ISDIGIT(p[4]))
+	{
+	    p += 4;
+	    bri_min = getdigits(&p);
+	}
+	else if (STRNCMP(p, "sbr", 3) == 0)
+	{
+	    p += 3;
+	    bri_sbr = TRUE;
+	}
+	else if (STRNCMP(p, "list:", 5) == 0)
+	{
+	    p += 5;
+	    bri_list = getdigits(&p);
+	}
+	else if (STRNCMP(p, "column:", 7) == 0)
+	{
+	    p += 7;
+	    bri_vcol = getdigits(&p);
+	}
+	if (*p != ',' && *p != NUL)
+	    return FAIL;
+	if (*p == ',')
+	    ++p;
+    }
+
+    wp->w_briopt_shift = bri_shift;
+    wp->w_briopt_min   = bri_min;
+    wp->w_briopt_sbr   = bri_sbr;
+    wp->w_briopt_list  = bri_list;
+    wp->w_briopt_vcol  = bri_vcol;
+
+    return OK;
+}
+
+/*
+ * Return appropriate space number for breakindent, taking influencing
+ * parameters into account. Window must be specified, since it is not
+ * necessarily always the current one.
+ */
+    int
+get_breakindent_win(
+    win_T	*wp,
+    char_u	*line) // start of the line
+{
+    static int	    prev_indent = 0;	// cached indent value
+    static long	    prev_ts     = 0L;	// cached tabstop value
+    static int	    prev_fnum   = 0;	// cached buffer number
+    static char_u   *prev_line  = NULL;	// cached copy of "line"
+    static varnumber_T prev_tick = 0;   // changedtick of cached value
+# ifdef FEAT_VARTABS
+    static int      *prev_vts = NULL;   // cached vartabs values
+# endif
+    static int      prev_list = 0;	// cached list value
+    static int      prev_listopt = 0;	// cached w_p_briopt_list value
+    // cached formatlistpat value
+    static char_u   *prev_flp = NULL;
+    int		    bri = 0;
+    // window width minus window margin space, i.e. what rests for text
+    const int	    eff_wwidth = wp->w_width
+			    - ((wp->w_p_nu || wp->w_p_rnu)
+				&& (vim_strchr(p_cpo, CPO_NUMCOL) == NULL)
+						? number_width(wp) + 1 : 0);
+
+    // used cached indent, unless
+    // - buffer changed
+    // - 'tabstop' changed
+    // - buffer was changed
+    // - 'briopt_list changed' changed or
+    // - 'formatlistpattern' changed
+    // - line changed
+    // - 'vartabs' changed
+    if (prev_fnum != wp->w_buffer->b_fnum
+	    || prev_ts != wp->w_buffer->b_p_ts
+	    || prev_tick != CHANGEDTICK(wp->w_buffer)
+	    || prev_listopt != wp->w_briopt_list
+	    || prev_flp == NULL
+	    || STRCMP(prev_flp, get_flp_value(wp->w_buffer)) != 0
+	    || prev_line == NULL || STRCMP(prev_line, line) != 0
+# ifdef FEAT_VARTABS
+	    || prev_vts != wp->w_buffer->b_p_vts_array
+# endif
+	)
+    {
+	prev_fnum = wp->w_buffer->b_fnum;
+	vim_free(prev_line);
+	prev_line = vim_strsave(line);
+	prev_ts = wp->w_buffer->b_p_ts;
+	prev_tick = CHANGEDTICK(wp->w_buffer);
+# ifdef FEAT_VARTABS
+	prev_vts = wp->w_buffer->b_p_vts_array;
+	if (wp->w_briopt_vcol == 0)
+	    prev_indent = get_indent_str_vtab(line,
+				     (int)wp->w_buffer->b_p_ts,
+				    wp->w_buffer->b_p_vts_array, wp->w_p_list);
+# else
+	if (wp->w_briopt_vcol == 0)
+	    prev_indent = get_indent_str(line,
+				     (int)wp->w_buffer->b_p_ts, wp->w_p_list);
+# endif
+	prev_listopt = wp->w_briopt_list;
+	prev_list = 0;
+	vim_free(prev_flp);
+	prev_flp = vim_strsave(get_flp_value(wp->w_buffer));
+	// add additional indent for numbered lists
+	if (wp->w_briopt_list != 0 && wp->w_briopt_vcol == 0)
+	{
+	    regmatch_T	    regmatch;
+
+	    regmatch.regprog = vim_regcomp(prev_flp,
+				   RE_MAGIC + RE_STRING + RE_AUTO + RE_STRICT);
+
+	    if (regmatch.regprog != NULL)
+	    {
+		regmatch.rm_ic = FALSE;
+		if (vim_regexec(&regmatch, line, 0))
+		{
+		    if (wp->w_briopt_list > 0)
+			prev_list = wp->w_briopt_list;
+		    else
+			prev_indent = (*regmatch.endp - *regmatch.startp);
+		}
+		vim_regfree(regmatch.regprog);
+	    }
+	}
+    }
+    if (wp->w_briopt_vcol != 0)
+    {
+	// column value has priority
+	bri = wp->w_briopt_vcol;
+	prev_list = 0;
+    }
+    else
+	bri = prev_indent + wp->w_briopt_shift;
+
+    // Add offset for number column, if 'n' is in 'cpoptions'
+    bri += win_col_off2(wp);
+
+    // add additional indent for numbered lists
+    if (wp->w_briopt_list > 0)
+	bri += prev_list;
+
+    // indent minus the length of the showbreak string
+    if (wp->w_briopt_sbr)
+	bri -= vim_strsize(get_showbreak_value(wp));
+
+
+    // never indent past left window margin
+    if (bri < 0)
+	bri = 0;
+
+    // always leave at least bri_min characters on the left,
+    // if text width is sufficient
+    else if (bri > eff_wwidth - wp->w_briopt_min)
+	bri = (eff_wwidth - wp->w_briopt_min < 0)
+					   ? 0 : eff_wwidth - wp->w_briopt_min;
+
+    return bri;
+}
+#endif
+
+/*
+ * When extra == 0: Return TRUE if the cursor is before or on the first
+ *		    non-blank in the line.
+ * When extra == 1: Return TRUE if the cursor is before the first non-blank in
+ *		    the line.
+ */
+    int
+inindent(int extra)
+{
+    char_u	*ptr;
+    colnr_T	col;
+
+    for (col = 0, ptr = ml_get_curline(); VIM_ISWHITE(*ptr); ++col)
+	++ptr;
+    if (col >= curwin->w_cursor.col + extra)
+	return TRUE;
+    else
+	return FALSE;
+}
+
+/*
+ * op_reindent - handle reindenting a block of lines.
+ */
+    void
+op_reindent(oparg_T *oap, int (*how)(void))
+{
+    long	i = 0;
+    char_u	*l;
+    int		amount;
+    linenr_T	first_changed = 0;
+    linenr_T	last_changed = 0;
+    linenr_T	start_lnum = curwin->w_cursor.lnum;
+
+    // Don't even try when 'modifiable' is off.
+    if (!curbuf->b_p_ma)
+    {
+	emsg(_(e_cannot_make_changes_modifiable_is_off));
+	return;
+    }
+
+    // Save for undo.  Do this once for all lines, much faster than doing this
+    // for each line separately, especially when undoing.
+    if (u_savecommon(start_lnum - 1, start_lnum + oap->line_count,
+				     start_lnum + oap->line_count, FALSE) == OK)
+	for (i = oap->line_count; --i >= 0 && !got_int; )
+	{
+	    // it's a slow thing to do, so give feedback so there's no worry
+	    // that the computer's just hung.
+
+	    if (i > 1
+		    && (i % 50 == 0 || i == oap->line_count - 1)
+		    && oap->line_count > p_report)
+		smsg(_("%ld lines to indent... "), i);
+
+	    // Be vi-compatible: For lisp indenting the first line is not
+	    // indented, unless there is only one line.
+	    if (i != oap->line_count - 1 || oap->line_count == 1
+						     || how != get_lisp_indent)
+	    {
+		l = skipwhite(ml_get_curline());
+		if (*l == NUL)		    // empty or blank line
+		    amount = 0;
+		else
+		    amount = how();	    // get the indent for this line
+
+		if (amount >= 0 && set_indent(amount, 0))
+		{
+		    // did change the indent, call changed_lines() later
+		    if (first_changed == 0)
+			first_changed = curwin->w_cursor.lnum;
+		    last_changed = curwin->w_cursor.lnum;
+		}
+	    }
+	    ++curwin->w_cursor.lnum;
+	    curwin->w_cursor.col = 0;  // make sure it's valid
+	}
+
+    // put cursor on first non-blank of indented line
+    curwin->w_cursor.lnum = start_lnum;
+    beginline(BL_SOL | BL_FIX);
+
+    // Mark changed lines so that they will be redrawn.  When Visual
+    // highlighting was present, need to continue until the last line.  When
+    // there is no change still need to remove the Visual highlighting.
+    if (last_changed != 0)
+	changed_lines(first_changed, 0,
+		oap->is_VIsual ? start_lnum + oap->line_count :
+		last_changed + 1, 0L);
+    else if (oap->is_VIsual)
+	redraw_curbuf_later(UPD_INVERTED);
+
+    if (oap->line_count > p_report)
+    {
+	i = oap->line_count - (i + 1);
+	smsg(NGETTEXT("%ld line indented ",
+						 "%ld lines indented ", i), i);
+    }
+    if ((cmdmod.cmod_flags & CMOD_LOCKMARKS) == 0)
+    {
+	// set '[ and '] marks
+	curbuf->b_op_start = oap->start;
+	curbuf->b_op_end = oap->end;
+    }
+}
+
+/*
+ * Return TRUE if lines starting with '#' should be left aligned.
+ */
+    int
+preprocs_left(void)
+{
+    return
+	(curbuf->b_p_si && !curbuf->b_p_cin) ||
+	(curbuf->b_p_cin && in_cinkeys('#', ' ', TRUE)
+					   && curbuf->b_ind_hash_comment == 0)
+	;
+}
+
+/*
+ * Return TRUE if the conditions are OK for smart indenting.
+ */
+    int
+may_do_si(void)
+{
+    return curbuf->b_p_si
+	&& !curbuf->b_p_cin
+# ifdef FEAT_EVAL
+	&& *curbuf->b_p_inde == NUL
+# endif
+	&& !p_paste;
+}
+
+/*
+ * Try to do some very smart auto-indenting.
+ * Used when inserting a "normal" character.
+ */
+    void
+ins_try_si(int c)
+{
+    pos_T	*pos, old_pos;
+    char_u	*ptr;
+    int		i;
+    int		temp;
+
+    // do some very smart indenting when entering '{' or '}'
+    if (((did_si || can_si_back) && c == '{')
+	    || (can_si && c == '}' && inindent(0)))
+    {
+	// for '}' set indent equal to indent of line containing matching '{'
+	if (c == '}' && (pos = findmatch(NULL, '{')) != NULL)
+	{
+	    old_pos = curwin->w_cursor;
+	    // If the matching '{' has a ')' immediately before it (ignoring
+	    // white-space), then line up with the start of the line
+	    // containing the matching '(' if there is one.  This handles the
+	    // case where an "if (..\n..) {" statement continues over multiple
+	    // lines -- webb
+	    ptr = ml_get(pos->lnum);
+	    i = pos->col;
+	    if (i > 0)		// skip blanks before '{'
+		while (--i > 0 && VIM_ISWHITE(ptr[i]))
+		    ;
+	    curwin->w_cursor.lnum = pos->lnum;
+	    curwin->w_cursor.col = i;
+	    if (ptr[i] == ')' && (pos = findmatch(NULL, '(')) != NULL)
+		curwin->w_cursor = *pos;
+	    i = get_indent();
+	    curwin->w_cursor = old_pos;
+	    if (State & VREPLACE_FLAG)
+		change_indent(INDENT_SET, i, FALSE, NUL, TRUE);
+	    else
+		(void)set_indent(i, SIN_CHANGED);
+	}
+	else if (curwin->w_cursor.col > 0)
+	{
+	    // when inserting '{' after "O" reduce indent, but not
+	    // more than indent of previous line
+	    temp = TRUE;
+	    if (c == '{' && can_si_back && curwin->w_cursor.lnum > 1)
+	    {
+		old_pos = curwin->w_cursor;
+		i = get_indent();
+		while (curwin->w_cursor.lnum > 1)
+		{
+		    ptr = skipwhite(ml_get(--(curwin->w_cursor.lnum)));
+
+		    // ignore empty lines and lines starting with '#'.
+		    if (*ptr != '#' && *ptr != NUL)
+			break;
+		}
+		if (get_indent() >= i)
+		    temp = FALSE;
+		curwin->w_cursor = old_pos;
+	    }
+	    if (temp)
+		shift_line(TRUE, FALSE, 1, TRUE);
+	}
+    }
+
+    // set indent of '#' always to 0
+    if (curwin->w_cursor.col > 0 && can_si && c == '#' && inindent(0))
+    {
+	// remember current indent for next line
+	old_indent = get_indent();
+	(void)set_indent(0, SIN_CHANGED);
+    }
+
+    // Adjust ai_col, the char at this position can be deleted.
+    if (ai_col > curwin->w_cursor.col)
+	ai_col = curwin->w_cursor.col;
+}
+
+/*
+ * Insert an indent (for <Tab> or CTRL-T) or delete an indent (for CTRL-D).
+ * Keep the cursor on the same character.
+ * type == INDENT_INC	increase indent (for CTRL-T or <Tab>)
+ * type == INDENT_DEC	decrease indent (for CTRL-D)
+ * type == INDENT_SET	set indent to "amount"
+ * if round is TRUE, round the indent to 'shiftwidth' (only with _INC and _Dec).
+ */
+    void
+change_indent(
+    int		type,
+    int		amount,
+    int		round,
+    int		replaced,	// replaced character, put on replace stack
+    int		call_changed_bytes)	// call changed_bytes()
+{
+    int		vcol;
+    int		last_vcol;
+    int		insstart_less;		// reduction for Insstart.col
+    int		new_cursor_col;
+    int		i;
+    char_u	*ptr;
+    int		save_p_list;
+    int		start_col;
+    colnr_T	vc;
+    colnr_T	orig_col = 0;		// init for GCC
+    char_u	*new_line, *orig_line = NULL;	// init for GCC
+
+    // MODE_VREPLACE state needs to know what the line was like before changing
+    if (State & VREPLACE_FLAG)
+    {
+	orig_line = vim_strsave(ml_get_curline());  // Deal with NULL below
+	orig_col = curwin->w_cursor.col;
+    }
+
+    // for the following tricks we don't want list mode
+    save_p_list = curwin->w_p_list;
+    curwin->w_p_list = FALSE;
+#ifdef FEAT_PROP_POPUP
+    ignore_text_props = TRUE;
+#endif
+    vc = getvcol_nolist(&curwin->w_cursor);
+    vcol = vc;
+
+    // For Replace mode we need to fix the replace stack later, which is only
+    // possible when the cursor is in the indent.  Remember the number of
+    // characters before the cursor if it's possible.
+    start_col = curwin->w_cursor.col;
+
+    // determine offset from first non-blank
+    new_cursor_col = curwin->w_cursor.col;
+    beginline(BL_WHITE);
+    new_cursor_col -= curwin->w_cursor.col;
+
+    insstart_less = curwin->w_cursor.col;
+
+    // If the cursor is in the indent, compute how many screen columns the
+    // cursor is to the left of the first non-blank.
+    if (new_cursor_col < 0)
+	vcol = get_indent() - vcol;
+
+    if (new_cursor_col > 0)	    // can't fix replace stack
+	start_col = -1;
+
+    // Set the new indent.  The cursor will be put on the first non-blank.
+    if (type == INDENT_SET)
+	(void)set_indent(amount, call_changed_bytes ? SIN_CHANGED : 0);
+    else
+    {
+	int	save_State = State;
+
+	// Avoid being called recursively.
+	if (State & VREPLACE_FLAG)
+	    State = MODE_INSERT;
+	shift_line(type == INDENT_DEC, round, 1, call_changed_bytes);
+	State = save_State;
+    }
+    insstart_less -= curwin->w_cursor.col;
+
+    // Try to put cursor on same character.
+    // If the cursor is at or after the first non-blank in the line,
+    // compute the cursor column relative to the column of the first
+    // non-blank character.
+    // If we are not in insert mode, leave the cursor on the first non-blank.
+    // If the cursor is before the first non-blank, position it relative
+    // to the first non-blank, counted in screen columns.
+    if (new_cursor_col >= 0)
+    {
+	// When changing the indent while the cursor is touching it, reset
+	// Insstart_col to 0.
+	if (new_cursor_col == 0)
+	    insstart_less = MAXCOL;
+	new_cursor_col += curwin->w_cursor.col;
+    }
+    else if (!(State & MODE_INSERT))
+	new_cursor_col = curwin->w_cursor.col;
+    else
+    {
+	chartabsize_T cts;
+
+	// Compute the screen column where the cursor should be.
+	vcol = get_indent() - vcol;
+	curwin->w_virtcol = (colnr_T)((vcol < 0) ? 0 : vcol);
+
+	// Advance the cursor until we reach the right screen column.
+	last_vcol = 0;
+	ptr = ml_get_curline();
+	init_chartabsize_arg(&cts, curwin, 0, 0, ptr, ptr);
+	while (cts.cts_vcol <= (int)curwin->w_virtcol)
+	{
+	    last_vcol = cts.cts_vcol;
+	    if (cts.cts_vcol > 0)
+		MB_PTR_ADV(cts.cts_ptr);
+	    if (*cts.cts_ptr == NUL)
+		break;
+	    cts.cts_vcol += lbr_chartabsize(&cts);
+	}
+	vcol = last_vcol;
+	new_cursor_col = cts.cts_ptr - cts.cts_line;
+	clear_chartabsize_arg(&cts);
+
+	// May need to insert spaces to be able to position the cursor on
+	// the right screen column.
+	if (vcol != (int)curwin->w_virtcol)
+	{
+	    curwin->w_cursor.col = (colnr_T)new_cursor_col;
+	    i = (int)curwin->w_virtcol - vcol;
+	    ptr = alloc(i + 1);
+	    if (ptr != NULL)
+	    {
+		new_cursor_col += i;
+		ptr[i] = NUL;
+		while (--i >= 0)
+		    ptr[i] = ' ';
+		ins_str(ptr);
+		vim_free(ptr);
+	    }
+	}
+
+	// When changing the indent while the cursor is in it, reset
+	// Insstart_col to 0.
+	insstart_less = MAXCOL;
+    }
+
+    curwin->w_p_list = save_p_list;
+
+    if (new_cursor_col <= 0)
+	curwin->w_cursor.col = 0;
+    else
+	curwin->w_cursor.col = (colnr_T)new_cursor_col;
+    curwin->w_set_curswant = TRUE;
+    changed_cline_bef_curs();
+
+    // May have to adjust the start of the insert.
+    if (State & MODE_INSERT)
+    {
+	if (curwin->w_cursor.lnum == Insstart.lnum && Insstart.col != 0)
+	{
+	    if ((int)Insstart.col <= insstart_less)
+		Insstart.col = 0;
+	    else
+		Insstart.col -= insstart_less;
+	}
+	if ((int)ai_col <= insstart_less)
+	    ai_col = 0;
+	else
+	    ai_col -= insstart_less;
+    }
+
+    // For MODE_REPLACE state, may have to fix the replace stack, if it's
+    // possible.  If the number of characters before the cursor decreased, need
+    // to pop a few characters from the replace stack.
+    // If the number of characters before the cursor increased, need to push a
+    // few NULs onto the replace stack.
+    if (REPLACE_NORMAL(State) && start_col >= 0)
+    {
+	while (start_col > (int)curwin->w_cursor.col)
+	{
+	    replace_join(0);	    // remove a NUL from the replace stack
+	    --start_col;
+	}
+	while (start_col < (int)curwin->w_cursor.col || replaced)
+	{
+	    replace_push(NUL);
+	    if (replaced)
+	    {
+		replace_push(replaced);
+		replaced = NUL;
+	    }
+	    ++start_col;
+	}
+    }
+#ifdef FEAT_PROP_POPUP
+    ignore_text_props = FALSE;
+#endif
+
+    // For MODE_VREPLACE state, we also have to fix the replace stack.  In this
+    // case it is always possible because we backspace over the whole line and
+    // then put it back again the way we wanted it.
+    if (State & VREPLACE_FLAG)
+    {
+	// If orig_line didn't allocate, just return.  At least we did the job,
+	// even if you can't backspace.
+	if (orig_line == NULL)
+	    return;
+
+	// Save new line
+	new_line = vim_strsave(ml_get_curline());
+	if (new_line == NULL)
+	    return;
+
+	// We only put back the new line up to the cursor
+	new_line[curwin->w_cursor.col] = NUL;
+
+	// Put back original line
+	ml_replace(curwin->w_cursor.lnum, orig_line, FALSE);
+	curwin->w_cursor.col = orig_col;
+
+	// Backspace from cursor to start of line
+	backspace_until_column(0);
+
+	// Insert new stuff into line again
+	ins_bytes(new_line);
+
+	vim_free(new_line);
+    }
+}
+
+/*
+ * Copy the indent from ptr to the current line (and fill to size)
+ * Leaves the cursor on the first non-blank in the line.
+ * Returns TRUE if the line was changed.
+ */
+    int
+copy_indent(int size, char_u *src)
+{
+    char_u	*p = NULL;
+    char_u	*line = NULL;
+    char_u	*s;
+    int		todo;
+    int		ind_len;
+    int		line_len = 0;
+    int		tab_pad;
+    int		ind_done;
+    int		round;
+#ifdef FEAT_VARTABS
+    int		ind_col;
+#endif
+
+    // Round 1: compute the number of characters needed for the indent
+    // Round 2: copy the characters.
+    for (round = 1; round <= 2; ++round)
+    {
+	todo = size;
+	ind_len = 0;
+	ind_done = 0;
+#ifdef FEAT_VARTABS
+	ind_col = 0;
+#endif
+	s = src;
+
+	// Count/copy the usable portion of the source line
+	while (todo > 0 && VIM_ISWHITE(*s))
+	{
+	    if (*s == TAB)
+	    {
+#ifdef FEAT_VARTABS
+		tab_pad = tabstop_padding(ind_done, curbuf->b_p_ts,
+							curbuf->b_p_vts_array);
+#else
+		tab_pad = (int)curbuf->b_p_ts
+					   - (ind_done % (int)curbuf->b_p_ts);
+#endif
+		// Stop if this tab will overshoot the target
+		if (todo < tab_pad)
+		    break;
+		todo -= tab_pad;
+		ind_done += tab_pad;
+#ifdef FEAT_VARTABS
+		ind_col += tab_pad;
+#endif
+	    }
+	    else
+	    {
+		--todo;
+		++ind_done;
+#ifdef FEAT_VARTABS
+		++ind_col;
+#endif
+	    }
+	    ++ind_len;
+	    if (p != NULL)
+		*p++ = *s;
+	    ++s;
+	}
+
+	// Fill to next tabstop with a tab, if possible
+#ifdef FEAT_VARTABS
+	tab_pad = tabstop_padding(ind_done, curbuf->b_p_ts,
+							curbuf->b_p_vts_array);
+#else
+	tab_pad = (int)curbuf->b_p_ts - (ind_done % (int)curbuf->b_p_ts);
+#endif
+	if (todo >= tab_pad && !curbuf->b_p_et)
+	{
+	    todo -= tab_pad;
+	    ++ind_len;
+#ifdef FEAT_VARTABS
+	    ind_col += tab_pad;
+#endif
+	    if (p != NULL)
+		*p++ = TAB;
+	}
+
+	// Add tabs required for indent
+	if (!curbuf->b_p_et)
+	{
+#ifdef FEAT_VARTABS
+	    for (;;)
+	    {
+		tab_pad = tabstop_padding(ind_col, curbuf->b_p_ts,
+							curbuf->b_p_vts_array);
+		if (todo < tab_pad)
+		    break;
+		todo -= tab_pad;
+		++ind_len;
+		ind_col += tab_pad;
+		if (p != NULL)
+		    *p++ = TAB;
+	    }
+#else
+	    while (todo >= (int)curbuf->b_p_ts)
+	    {
+		todo -= (int)curbuf->b_p_ts;
+		++ind_len;
+		if (p != NULL)
+		    *p++ = TAB;
+	    }
+#endif
+	}
+
+	// Count/add spaces required for indent
+	while (todo > 0)
+	{
+	    --todo;
+	    ++ind_len;
+	    if (p != NULL)
+		*p++ = ' ';
+	}
+
+	if (p == NULL)
+	{
+	    // Allocate memory for the result: the copied indent, new indent
+	    // and the rest of the line.
+	    line_len = (int)STRLEN(ml_get_curline()) + 1;
+	    line = alloc(ind_len + line_len);
+	    if (line == NULL)
+		return FALSE;
+	    p = line;
+	}
+    }
+
+    // Append the original line
+    mch_memmove(p, ml_get_curline(), (size_t)line_len);
+
+    // Replace the line
+    ml_replace(curwin->w_cursor.lnum, line, FALSE);
+
+    // Put the cursor after the indent.
+    curwin->w_cursor.col = ind_len;
+    return TRUE;
+}
+
+/*
+ * Give a "resulting text too long" error and maybe set got_int.
+ */
+    static void
+emsg_text_too_long(void)
+{
+    emsg(_(e_resulting_text_too_long));
+#ifdef FEAT_EVAL
+    // when not inside a try/catch set got_int to break out of any loop
+    if (trylevel == 0)
+#endif
+	got_int = TRUE;
+}
+
+/*
+ * ":retab".
+ */
+    void
+ex_retab(exarg_T *eap)
+{
+    linenr_T	lnum;
+    int		got_tab = FALSE;
+    long	num_spaces = 0;
+    long	num_tabs;
+    long	len;
+    long	col;
+    long	vcol;
+    long	start_col = 0;		// For start of white-space string
+    long	start_vcol = 0;		// For start of white-space string
+    long	old_len;
+    long	new_len;
+    char_u	*ptr;
+    char_u	*new_line = (char_u *)1; // init to non-NULL
+    int		did_undo;		// called u_save for current line
+#ifdef FEAT_VARTABS
+    int		*new_vts_array = NULL;
+    char_u	*new_ts_str;		// string value of tab argument
+#else
+    int		temp;
+    int		new_ts;
+#endif
+    int		save_list;
+    linenr_T	first_line = 0;		// first changed line
+    linenr_T	last_line = 0;		// last changed line
+
+    save_list = curwin->w_p_list;
+    curwin->w_p_list = 0;	    // don't want list mode here
+
+#ifdef FEAT_VARTABS
+    new_ts_str = eap->arg;
+    if (tabstop_set(eap->arg, &new_vts_array) == FAIL)
+	return;
+    while (vim_isdigit(*(eap->arg)) || *(eap->arg) == ',')
+	++(eap->arg);
+
+    // This ensures that either new_vts_array and new_ts_str are freshly
+    // allocated, or new_vts_array points to an existing array and new_ts_str
+    // is null.
+    if (new_vts_array == NULL)
+    {
+	new_vts_array = curbuf->b_p_vts_array;
+	new_ts_str = NULL;
+    }
+    else
+	new_ts_str = vim_strnsave(new_ts_str, eap->arg - new_ts_str);
+#else
+    ptr = eap->arg;
+    new_ts = getdigits(&ptr);
+    if (new_ts < 0 && *eap->arg == '-')
+    {
+	emsg(_(e_argument_must_be_positive));
+	return;
+    }
+    if (new_ts < 0 || new_ts > TABSTOP_MAX)
+    {
+	semsg(_(e_invalid_argument_str), eap->arg);
+	return;
+    }
+    if (new_ts == 0)
+	new_ts = curbuf->b_p_ts;
+#endif
+    for (lnum = eap->line1; !got_int && lnum <= eap->line2; ++lnum)
+    {
+	ptr = ml_get(lnum);
+	col = 0;
+	vcol = 0;
+	did_undo = FALSE;
+	for (;;)
+	{
+	    if (VIM_ISWHITE(ptr[col]))
+	    {
+		if (!got_tab && num_spaces == 0)
+		{
+		    // First consecutive white-space
+		    start_vcol = vcol;
+		    start_col = col;
+		}
+		if (ptr[col] == ' ')
+		    num_spaces++;
+		else
+		    got_tab = TRUE;
+	    }
+	    else
+	    {
+		if (got_tab || (eap->forceit && num_spaces > 1))
+		{
+		    // Retabulate this string of white-space
+
+		    // len is virtual length of white string
+		    len = num_spaces = vcol - start_vcol;
+		    num_tabs = 0;
+		    if (!curbuf->b_p_et)
+		    {
+#ifdef FEAT_VARTABS
+			int t, s;
+
+			tabstop_fromto(start_vcol, vcol,
+					curbuf->b_p_ts, new_vts_array, &t, &s);
+			num_tabs = t;
+			num_spaces = s;
+#else
+			temp = new_ts - (start_vcol % new_ts);
+			if (num_spaces >= temp)
+			{
+			    num_spaces -= temp;
+			    num_tabs++;
+			}
+			num_tabs += num_spaces / new_ts;
+			num_spaces -= (num_spaces / new_ts) * new_ts;
+#endif
+		    }
+		    if (curbuf->b_p_et || got_tab ||
+					(num_spaces + num_tabs < len))
+		    {
+			if (did_undo == FALSE)
+			{
+			    did_undo = TRUE;
+			    if (u_save((linenr_T)(lnum - 1),
+						(linenr_T)(lnum + 1)) == FAIL)
+			    {
+				new_line = NULL;	// flag out-of-memory
+				break;
+			    }
+			}
+
+			// len is actual number of white characters used
+			len = num_spaces + num_tabs;
+			old_len = (long)STRLEN(ptr);
+			new_len = old_len - col + start_col + len + 1;
+			if (new_len <= 0 || new_len >= MAXCOL)
+			{
+			    emsg_text_too_long();
+			    break;
+			}
+			new_line = alloc(new_len);
+			if (new_line == NULL)
+			    break;
+			if (start_col > 0)
+			    mch_memmove(new_line, ptr, (size_t)start_col);
+			mch_memmove(new_line + start_col + len,
+				      ptr + col, (size_t)(old_len - col + 1));
+			ptr = new_line + start_col;
+			for (col = 0; col < len; col++)
+			    ptr[col] = (col < num_tabs) ? '\t' : ' ';
+			if (ml_replace(lnum, new_line, FALSE) == OK)
+			    // "new_line" may have been copied
+			    new_line = curbuf->b_ml.ml_line_ptr;
+			if (first_line == 0)
+			    first_line = lnum;
+			last_line = lnum;
+			ptr = new_line;
+			col = start_col + len;
+		    }
+		}
+		got_tab = FALSE;
+		num_spaces = 0;
+	    }
+	    if (ptr[col] == NUL)
+		break;
+	    vcol += chartabsize(ptr + col, (colnr_T)vcol);
+	    if (vcol >= MAXCOL)
+	    {
+		emsg_text_too_long();
+		break;
+	    }
+	    if (has_mbyte)
+		col += (*mb_ptr2len)(ptr + col);
+	    else
+		++col;
+	}
+	if (new_line == NULL)		    // out of memory
+	    break;
+	line_breakcheck();
+    }
+    if (got_int)
+	emsg(_(e_interrupted));
+
+#ifdef FEAT_VARTABS
+    // If a single value was given then it can be considered equal to
+    // either the value of 'tabstop' or the value of 'vartabstop'.
+    if (tabstop_count(curbuf->b_p_vts_array) == 0
+	&& tabstop_count(new_vts_array) == 1
+	&& curbuf->b_p_ts == tabstop_first(new_vts_array))
+	; // not changed
+    else if (tabstop_count(curbuf->b_p_vts_array) > 0
+	&& tabstop_eq(curbuf->b_p_vts_array, new_vts_array))
+	; // not changed
+    else
+	redraw_curbuf_later(UPD_NOT_VALID);
+#else
+    if (curbuf->b_p_ts != new_ts)
+	redraw_curbuf_later(UPD_NOT_VALID);
+#endif
+    if (first_line != 0)
+	changed_lines(first_line, 0, last_line + 1, 0L);
+
+    curwin->w_p_list = save_list;	// restore 'list'
+
+#ifdef FEAT_VARTABS
+    if (new_ts_str != NULL)		// set the new tabstop
+    {
+	// If 'vartabstop' is in use or if the value given to retab has more
+	// than one tabstop then update 'vartabstop'.
+	int *old_vts_ary = curbuf->b_p_vts_array;
+
+	if (tabstop_count(old_vts_ary) > 0 || tabstop_count(new_vts_array) > 1)
+	{
+	    set_string_option_direct((char_u *)"vts", -1, new_ts_str,
+							OPT_FREE|OPT_LOCAL, 0);
+	    curbuf->b_p_vts_array = new_vts_array;
+	    vim_free(old_vts_ary);
+	}
+	else
+	{
+	    // 'vartabstop' wasn't in use and a single value was given to
+	    // retab then update 'tabstop'.
+	    curbuf->b_p_ts = tabstop_first(new_vts_array);
+	    vim_free(new_vts_array);
+	}
+	vim_free(new_ts_str);
+    }
+#else
+    curbuf->b_p_ts = new_ts;
+#endif
+    coladvance(curwin->w_curswant);
+
+    u_clearline();
+}
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * Get indent level from 'indentexpr'.
+ */
+    int
+get_expr_indent(void)
+{
+    int		indent = -1;
+    char_u	*inde_copy;
+    pos_T	save_pos;
+    colnr_T	save_curswant;
+    int		save_set_curswant;
+    int		save_State;
+    int		use_sandbox = was_set_insecurely((char_u *)"indentexpr",
+								   OPT_LOCAL);
+    sctx_T	save_sctx = current_sctx;
+
+    // Save and restore cursor position and curswant, in case it was changed
+    // via :normal commands
+    save_pos = curwin->w_cursor;
+    save_curswant = curwin->w_curswant;
+    save_set_curswant = curwin->w_set_curswant;
+    set_vim_var_nr(VV_LNUM, curwin->w_cursor.lnum);
+    if (use_sandbox)
+	++sandbox;
+    ++textlock;
+    current_sctx = curbuf->b_p_script_ctx[BV_INDE];
+
+    // Need to make a copy, the 'indentexpr' option could be changed while
+    // evaluating it.
+    inde_copy = vim_strsave(curbuf->b_p_inde);
+    if (inde_copy != NULL)
+    {
+	indent = (int)eval_to_number(inde_copy, TRUE);
+	vim_free(inde_copy);
+    }
+
+    if (use_sandbox)
+	--sandbox;
+    --textlock;
+    current_sctx = save_sctx;
+
+    // Restore the cursor position so that 'indentexpr' doesn't need to.
+    // Pretend to be in Insert mode, allow cursor past end of line for "o"
+    // command.
+    save_State = State;
+    State = MODE_INSERT;
+    curwin->w_cursor = save_pos;
+    curwin->w_curswant = save_curswant;
+    curwin->w_set_curswant = save_set_curswant;
+    check_cursor();
+    State = save_State;
+
+    // Reset did_throw, unless 'debug' has "throw" and inside a try/catch.
+    if (did_throw && (vim_strchr(p_debug, 't') == NULL || trylevel == 0))
+    {
+	handle_did_throw();
+	did_throw = FALSE;
+    }
+
+    // If there is an error, just keep the current indent.
+    if (indent < 0)
+	indent = get_indent();
+
+    return indent;
+}
+#endif
+
+    static int
+lisp_match(char_u *p)
+{
+    char_u	buf[LSIZE];
+    int		len;
+    char_u	*word = *curbuf->b_p_lw != NUL ? curbuf->b_p_lw : p_lispwords;
+
+    while (*word != NUL)
+    {
+	(void)copy_option_part(&word, buf, LSIZE, ",");
+	len = (int)STRLEN(buf);
+	if (STRNCMP(buf, p, len) == 0 && IS_WHITE_OR_NUL(p[len]))
+	    return TRUE;
+    }
+    return FALSE;
+}
+
+/*
+ * When 'p' is present in 'cpoptions, a Vi compatible method is used.
+ * The incompatible newer method is quite a bit better at indenting
+ * code in lisp-like languages than the traditional one; it's still
+ * mostly heuristics however -- Dirk van Deun, dirk@rave.org
+ *
+ * TODO:
+ * Findmatch() should be adapted for lisp, also to make showmatch
+ * work correctly: now (v5.3) it seems all C/C++ oriented:
+ * - it does not recognize the #\( and #\) notations as character literals
+ * - it doesn't know about comments starting with a semicolon
+ * - it incorrectly interprets '(' as a character literal
+ * All this messes up get_lisp_indent in some rare cases.
+ * Update from Sergey Khorev:
+ * I tried to fix the first two issues.
+ */
+    int
+get_lisp_indent(void)
+{
+    pos_T	*pos, realpos, paren;
+    int		amount;
+    char_u	*that;
+    colnr_T	col;
+    colnr_T	firsttry;
+    int		parencount, quotecount;
+    int		vi_lisp;
+
+    // Set vi_lisp to use the vi-compatible method
+    vi_lisp = (vim_strchr(p_cpo, CPO_LISP) != NULL);
+
+    realpos = curwin->w_cursor;
+    curwin->w_cursor.col = 0;
+
+    if ((pos = findmatch(NULL, '(')) == NULL)
+	pos = findmatch(NULL, '[');
+    else
+    {
+	paren = *pos;
+	pos = findmatch(NULL, '[');
+	if (pos == NULL || LT_POSP(pos, &paren))
+	    pos = &paren;
+    }
+    if (pos != NULL)
+    {
+	// Extra trick: Take the indent of the first previous non-white
+	// line that is at the same () level.
+	amount = -1;
+	parencount = 0;
+
+	while (--curwin->w_cursor.lnum >= pos->lnum)
+	{
+	    if (linewhite(curwin->w_cursor.lnum))
+		continue;
+	    for (that = ml_get_curline(); *that != NUL; ++that)
+	    {
+		if (*that == ';')
+		{
+		    while (*(that + 1) != NUL)
+			++that;
+		    continue;
+		}
+		if (*that == '\\')
+		{
+		    if (*(that + 1) != NUL)
+			++that;
+		    continue;
+		}
+		if (*that == '"' && *(that + 1) != NUL)
+		{
+		    while (*++that && *that != '"')
+		    {
+			// skipping escaped characters in the string
+			if (*that == '\\')
+			{
+			    if (*++that == NUL)
+				break;
+			    if (that[1] == NUL)
+			    {
+				++that;
+				break;
+			    }
+			}
+		    }
+		    if (*that == NUL)
+			break;
+		}
+		if (*that == '(' || *that == '[')
+		    ++parencount;
+		else if (*that == ')' || *that == ']')
+		    --parencount;
+	    }
+	    if (parencount == 0)
+	    {
+		amount = get_indent();
+		break;
+	    }
+	}
+
+	if (amount == -1)
+	{
+	    curwin->w_cursor.lnum = pos->lnum;
+	    curwin->w_cursor.col = pos->col;
+	    col = pos->col;
+
+	    that = ml_get_curline();
+
+	    if (vi_lisp && get_indent() == 0)
+		amount = 2;
+	    else
+	    {
+		char_u		*line = that;
+		chartabsize_T	cts;
+
+		init_chartabsize_arg(&cts, curwin, pos->lnum, 0, line, line);
+		while (*cts.cts_ptr != NUL && col > 0)
+		{
+		    cts.cts_vcol += lbr_chartabsize_adv(&cts);
+		    col--;
+		}
+		amount = cts.cts_vcol;
+		that = cts.cts_ptr;
+		clear_chartabsize_arg(&cts);
+
+		// Some keywords require "body" indenting rules (the
+		// non-standard-lisp ones are Scheme special forms):
+		//
+		// (let ((a 1))    instead    (let ((a 1))
+		//   (...))	      of	   (...))
+
+		if (!vi_lisp && (*that == '(' || *that == '[')
+						      && lisp_match(that + 1))
+		    amount += 2;
+		else
+		{
+		    if (*that != NUL)
+		    {
+			that++;
+			amount++;
+		    }
+		    firsttry = amount;
+
+		    init_chartabsize_arg(&cts, curwin, (colnr_T)(that - line),
+							   amount, line, that);
+		    while (VIM_ISWHITE(*cts.cts_ptr))
+		    {
+			cts.cts_vcol += lbr_chartabsize(&cts);
+			++cts.cts_ptr;
+		    }
+		    that = cts.cts_ptr;
+		    amount = cts.cts_vcol;
+		    clear_chartabsize_arg(&cts);
+
+		    if (*that && *that != ';') // not a comment line
+		    {
+			// test *that != '(' to accommodate first let/do
+			// argument if it is more than one line
+			if (!vi_lisp && *that != '(' && *that != '[')
+			    firsttry++;
+
+			parencount = 0;
+			quotecount = 0;
+
+			init_chartabsize_arg(&cts, curwin,
+				   (colnr_T)(that - line), amount, line, that);
+			if (vi_lisp
+				|| (*that != '"'
+				    && *that != '\''
+				    && *that != '#'
+				    && (*that < '0' || *that > '9')))
+			{
+			    while (*cts.cts_ptr
+				    && (!VIM_ISWHITE(*cts.cts_ptr)
+					|| quotecount
+					|| parencount)
+				    && (!((*cts.cts_ptr == '('
+							|| *cts.cts_ptr == '[')
+					    && !quotecount
+					    && !parencount
+					    && vi_lisp)))
+			    {
+				if (*cts.cts_ptr == '"')
+				    quotecount = !quotecount;
+				if ((*cts.cts_ptr == '(' || *cts.cts_ptr == '[')
+							       && !quotecount)
+				    ++parencount;
+				if ((*cts.cts_ptr == ')' || *cts.cts_ptr == ']')
+							       && !quotecount)
+				    --parencount;
+				if (*cts.cts_ptr == '\\'
+						    && *(cts.cts_ptr+1) != NUL)
+				    cts.cts_vcol += lbr_chartabsize_adv(&cts);
+				cts.cts_vcol += lbr_chartabsize_adv(&cts);
+			    }
+			}
+			while (VIM_ISWHITE(*cts.cts_ptr))
+			{
+			    cts.cts_vcol += lbr_chartabsize(&cts);
+			    ++cts.cts_ptr;
+			}
+			that = cts.cts_ptr;
+			amount = cts.cts_vcol;
+			clear_chartabsize_arg(&cts);
+
+			if (!*that || *that == ';')
+			    amount = firsttry;
+		    }
+		}
+	    }
+	}
+    }
+    else
+	amount = 0;	// no matching '(' or '[' found, use zero indent
+
+    curwin->w_cursor = realpos;
+
+    return amount;
+}
+
+/*
+ * Re-indent the current line, based on the current contents of it and the
+ * surrounding lines. Fixing the cursor position seems really easy -- I'm very
+ * confused what all the part that handles Control-T is doing that I'm not.
+ * "get_the_indent" should be get_c_indent, get_expr_indent or get_lisp_indent.
+ */
+
+    void
+fixthisline(int (*get_the_indent)(void))
+{
+    int amount = get_the_indent();
+
+    if (amount < 0)
+	return;
+
+    change_indent(INDENT_SET, amount, FALSE, 0, TRUE);
+    if (linewhite(curwin->w_cursor.lnum))
+	did_ai = TRUE;	// delete the indent if the line stays empty
+}
+
+/*
+ * Return TRUE if 'indentexpr' should be used for Lisp indenting.
+ * Caller may want to check 'autoindent'.
+ */
+    int
+use_indentexpr_for_lisp(void)
+{
+#ifdef FEAT_EVAL
+    return curbuf->b_p_lisp
+		&& *curbuf->b_p_inde != NUL
+		&& STRCMP(curbuf->b_p_lop, "expr:1") == 0;
+#else
+    return FALSE;
+#endif
+}
+
+/*
+ * Fix indent for 'lisp' and 'cindent'.
+ */
+    void
+fix_indent(void)
+{
+    if (p_paste)
+	return;  // no auto-indenting when 'paste' is set
+    if (curbuf->b_p_lisp && curbuf->b_p_ai)
+    {
+	if (use_indentexpr_for_lisp())
+	    do_c_expr_indent();
+	else
+	    fixthisline(get_lisp_indent);
+    }
+    else if (cindent_on())
+	do_c_expr_indent();
+}
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * "indent()" function
+ */
+    void
+f_indent(typval_T *argvars, typval_T *rettv)
+{
+    linenr_T	lnum;
+
+    if (in_vim9script() && check_for_lnum_arg(argvars, 0) == FAIL)
+	return;
+
+    lnum = tv_get_lnum(argvars);
+    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
+	rettv->vval.v_number = get_indent_lnum(lnum);
+    else
+    {
+	if (in_vim9script())
+	    semsg(_(e_invalid_line_number_nr), lnum);
+	rettv->vval.v_number = -1;
+    }
+}
+
+/*
+ * "lispindent(lnum)" function
+ */
+    void
+f_lispindent(typval_T *argvars UNUSED, typval_T *rettv)
+{
+    pos_T	pos;
+    linenr_T	lnum;
+
+    if (in_vim9script() && check_for_lnum_arg(argvars, 0) == FAIL)
+	return;
+
+    pos = curwin->w_cursor;
+    lnum = tv_get_lnum(argvars);
+    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
+    {
+	curwin->w_cursor.lnum = lnum;
+	rettv->vval.v_number = get_lisp_indent();
+	curwin->w_cursor = pos;
+    }
+    else if (in_vim9script())
+	semsg(_(e_invalid_line_number_nr), lnum);
+    else
+	rettv->vval.v_number = -1;
+}
+#endif