/
indent.c
2152 lines (1949 loc) · 49.5 KB
/
indent.c
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/* 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_positive));
else
semsg(_(e_invarg2), cp);
return FAIL;
}
}
if (VIM_ISDIGIT(*cp))
continue;
if (cp[0] == ',' && cp > var && cp[-1] != ',' && cp[1] != NUL)
{
++valcount;
continue;
}
semsg(_(e_invarg2), 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);
if (n < 0 || n > 9999)
{
semsg(_(e_invarg2), cp);
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)curbuf->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, 0);
}
#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 & 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(®match, 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;
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);
}
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;
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 char_u *prev_line = NULL; // cached pointer to line
static varnumber_T prev_tick = 0; // changedtick of cached value
# ifdef FEAT_VARTABS
static int *prev_vts = NULL; // cached vartabs values
# endif
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 pointer or 'tabstop' changed
if (prev_line != 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
# endif
)
{
prev_line = 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;
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
prev_indent = get_indent_str(line,
(int)wp->w_buffer->b_p_ts, wp->w_p_list);
# endif
}
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)
{
regmatch_T regmatch;
regmatch.regprog = vim_regcomp(curbuf->b_p_flp,
RE_MAGIC + RE_STRING + RE_AUTO + RE_STRICT);
if (regmatch.regprog != NULL)
{
regmatch.rm_ic = FALSE;
if (vim_regexec(®match, line, 0))
{
if (wp->w_briopt_list > 0)
bri += wp->w_briopt_list;
else
bri = (*regmatch.endp - *regmatch.startp);
}
vim_regfree(regmatch.regprog);
}
}
// 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.
*/