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Add comments to build_stl_str_hl

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This commit is contained in:
Wayne Rowcliffe
2015-09-15 02:06:02 -05:00
parent bf8038702d
commit cde2259a6b
1 changed files with 403 additions and 138 deletions
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537
src/nvim/buffer.c
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@@ -2833,8 +2833,11 @@ build_stl_str_hl (
{
int groupitem[STL_MAX_ITEM];
struct stl_item {
// Where the item starts in the status line output buffer
char_u *start;
// The minimum width of the item (at most 50 characters)
int minwid;
// The maximum width of the item
int maxwid;
enum {
Normal,
@@ -2846,6 +2849,13 @@ build_stl_str_hl (
Trunc
} type;
} item[STL_MAX_ITEM];
enum number_base {
DECIMAL = 10,
OCTAL = 8,
HEXIDECIMAL = 16
};
#define TMPLEN 70
char_u tmp[TMPLEN];
char_u *usefmt = fmt;
@@ -2879,12 +2889,18 @@ build_stl_str_hl (
byteval = (*mb_ptr2char)(line_ptr + wp->w_cursor.col);
int groupdepth = 0;
char_u *p = out;
int curitem = 0;
bool prevchar_isflag = true;
bool prevchar_isitem = false;
char_u *s;
for (s = usefmt; *s; ) {
// p is the current position in the output buffer
char_u *p = out;
// Proceed character by character through the statusline format string
// s is the current positon in the input buffer
for (char_u *s = usefmt; *s; ) {
if (curitem == STL_MAX_ITEM) {
/* There are too many items. Add the error code to the statusline
* to give the user a hint about what went wrong. */
@@ -2898,64 +2914,99 @@ build_stl_str_hl (
if (*s != NUL && *s != '%')
prevchar_isflag = prevchar_isitem = false;
/*
* Handle up to the next '%' or the end.
*/
// Copy the formatting verbatim until we reach the end of the string
// or find a formatting item (denoted by `%`)
// or run out of room in our output buffer.
while (*s != NUL && *s != '%' && p + 1 < out + outlen)
*p++ = *s++;
// If we have processed the entire format string or run out of
// room in our output buffer, exit the loop.
if (*s == NUL || p + 1 >= out + outlen)
break;
/*
* Handle one '%' item.
*/
// The rest of this loop wil handle a single `%` item.
// Note: We increment here to skip over the `%` character we are currently
// on so we can process the item's contents.
s++;
if (*s == NUL) /* ignore trailing % */
// Ignore `%` at the end of the format string
if (*s == NUL) {
break;
}
// Two `%` in a row is the escape sequence to print a
// single `%` in the output buffer.
if (*s == '%') {
// Ignore the character if we're out of room in the output buffer.
if (p + 1 >= out + outlen)
break;
*p++ = *s++;
prevchar_isflag = prevchar_isitem = false;
continue;
}
// STL_MIDDLEMARK denotes the separation place between left and right aligned items.
if (*s == STL_MIDDLEMARK) {
s++;
if (groupdepth > 0)
// Ignored when we are inside of a grouping
if (groupdepth > 0) {
continue;
}
item[curitem].type = Middle;
item[curitem++].start = p;
continue;
}
// STL_TRUNCMARK denotes where to begin truncating if the statusline is too long.
if (*s == STL_TRUNCMARK) {
s++;
item[curitem].type = Trunc;
item[curitem++].start = p;
continue;
}
// The end of a grouping
if (*s == ')') {
s++;
if (groupdepth < 1)
// Ignore if we are not actually inside a group currently
if (groupdepth < 1) {
continue;
}
groupdepth--;
//{ Determine how long the group is.
// Note: We set the current output position to null so `vim_strsize` will work.
char_u *t = item[groupitem[groupdepth]].start;
*p = NUL;
long l = vim_strsize(t);
//}
// If the group contained internal items and the group did not have a minimum width,
// and if there were no normal items in the group,
// move the output pointer back to where the group started (erase the group).
// Note: This also erases any plaintext characters that were in the group.
// Otherwise there would be no reason to do this step.
if (curitem > groupitem[groupdepth] + 1
&& item[groupitem[groupdepth]].minwid == 0) {
/* remove group if all items are empty */
long n;
for (n = groupitem[groupdepth] + 1; n < curitem; n++)
if (item[n].type == Normal)
bool has_normal_items = false;
for (long n = groupitem[groupdepth] + 1; n < curitem; n++) {
if (item[n].type == Normal) {
has_normal_items = true;
break;
if (n == curitem) {
}
}
if (!has_normal_items) {
p = t;
l = 0;
}
}
// If the group is longer than it is allowed to be
// truncate by removing bytes from the start of the group text.
if (l > item[groupitem[groupdepth]].maxwid) {
/* truncate, remove n bytes of text at the start */
//{ Determine the number of bytes to remove
long n;
if (has_mbyte) {
/* Find the first character that should be included. */
@@ -2966,60 +3017,88 @@ build_stl_str_hl (
}
} else
n = (long)(p - t) - item[groupitem[groupdepth]].maxwid + 1;
//}
// Prepend the `<` to indicate that the output was truncated.
*t = '<';
//{ Move the truncated output
memmove(t + 1, t + n, (size_t)(p - (t + n)));
p = p - n + 1;
/* Fill up space left over by half a double-wide char. */
while (++l < item[groupitem[groupdepth]].minwid)
*p++ = fillchar;
//}
/* correct the start of the items for the truncation */
for (l = groupitem[groupdepth] + 1; l < curitem; l++) {
// Shift everything back by the number of removed bytes
item[l].start -= n;
// If the item was partially or completely truncated, set its
// start to the start of the group
if (item[l].start < t)
item[l].start = t;
}
// If the group is shorter than the minimum width, add padding characters.
} else if (abs(item[groupitem[groupdepth]].minwid) > l) {
/* fill */
long n = item[groupitem[groupdepth]].minwid;
if (n < 0) {
/* fill by appending characters */
n = 0 - n;
while (l++ < n && p + 1 < out + outlen)
long min_group_width = item[groupitem[groupdepth]].minwid;
// If the group is left-aligned, add characters to the right.
if (min_group_width < 0) {
min_group_width = 0 - min_group_width;
while (l++ < min_group_width && p + 1 < out + outlen)
*p++ = fillchar;
// If the group is right-aligned, shift everything to the right and
// prepend with filler characters.
} else {
/* fill by inserting characters */
memmove(t + n - l, t, (size_t)(p - t));
l = n - l;
if (p + l >= out + outlen)
//{ Move the group to the right
memmove(t + min_group_width - l, t, (size_t)(p - t));
l = min_group_width - l;
if (p + l >= out + outlen) {
l = (long)((out + outlen) - p - 1);
}
p += l;
for (n = groupitem[groupdepth] + 1; n < curitem; n++)
//}
// Adjust item start positions
for (int n = groupitem[groupdepth] + 1; n < curitem; n++) {
item[n].start += l;
for (; l > 0; l--)
}
// Prepend the fill characters
for (; l > 0; l--) {
*t++ = fillchar;
}
}
}
continue;
}
int minwid = 0;
int maxwid = 9999;
bool zeropad = false;
long l = 1;
if (*s == '0') {
bool left_align = false;
// Denotes that numbers should be left-padded with zeros
bool zeropad = (*s == '0');
if (zeropad) {
s++;
zeropad = true;
}
// Denotes that the item should be left-aligned.
// This is tracked by using a negative length.
if (*s == '-') {
s++;
l = -1;
left_align = true;
}
// The first digit group is the item's min width
if (ascii_isdigit(*s)) {
minwid = getdigits_int(&s);
if (minwid < 0) /* overflow */
minwid = 0;
}
// User highlight groups override the min width field
// to denote the styling to use.
if (*s == STL_USER_HL) {
item[curitem].type = Highlight;
item[curitem].start = p;
@@ -3049,6 +3128,9 @@ build_stl_str_hl (
curitem++;
continue;
}
// Denotes the end of the minwid
// the maxwid may follow immediately after
if (*s == '.') {
s++;
if (ascii_isdigit(*s)) {
@@ -3057,7 +3139,12 @@ build_stl_str_hl (
maxwid = 50;
}
}
minwid = (minwid > 50 ? 50 : minwid) * l;
// Bound the minimum width at 50.
// Make the number negative to denote left alignment of the item
minwid = (minwid > 50 ? 50 : minwid) * (left_align ? -1 : 1);
// Denotes the start of a new group
if (*s == '(') {
groupitem[groupdepth++] = curitem;
item[curitem].type = Group;
@@ -3068,14 +3155,19 @@ build_stl_str_hl (
curitem++;
continue;
}
// An invalid item was specified.
// Continue processing on the next character of the format string.
if (vim_strchr(STL_ALL, *s) == NULL) {
s++;
continue;
}
// The status line item type
char_u opt = *s++;
/* OK - now for the real work */
char_u base = 'D';
enum number_base base = DECIMAL;
bool itemisflag = false;
bool fillable = true;
long num = -1;
@@ -3103,6 +3195,9 @@ build_stl_str_hl (
case STL_VIM_EXPR: /* '{' */
{
itemisflag = true;
// Attempt to copy the expression to evaluate into
// the output buffer as a null-terminated string.
char_u *t = p;
while (*s != '}' && *s != NUL && p + 1 < out + outlen)
*p++ = *s++;
@@ -3110,22 +3205,37 @@ build_stl_str_hl (
break;
s++;
*p = 0;
// Move our position in the output buffer to the beginning of the expression
p = t;
//{ Evaluate the expression
// Store the current buffer number as a string variable
vim_snprintf((char *)tmp, sizeof(tmp), "%d", curbuf->b_fnum);
set_internal_string_var((char_u *)"actual_curbuf", tmp);
// Switch the curbuf and curwin to the buffer and window we are evaluating the
// statusline for.
buf_T *o_curbuf = curbuf;
win_T *o_curwin = curwin;
curwin = wp;
curbuf = wp->w_buffer;
// Note: The result stored in `t` is unused.
str = eval_to_string_safe(p, &t, use_sandbox);
// Switch back to the actual current buffer and window.
curwin = o_curwin;
curbuf = o_curbuf;
// Remove the variable we just stored
do_unlet((char_u *)"g:actual_curbuf", TRUE);
//}
// Check if the evaluated result is a number.
// If so, convert the number to an int and free the string.
if (str != NULL && *str != 0) {
if (*skipdigits(str) == NUL) {
num = atoi((char *)str);
@@ -3176,15 +3286,27 @@ build_stl_str_hl (
break;
case STL_ALTPERCENT:
// Store the position percentage in our temporary buffer.
// Note: We cannot store the value in `num` because
// `get_rel_pos` can return a named position. Ex: "Top"
get_rel_pos(wp, tmp, TMPLEN);
str = tmp;
get_rel_pos(wp, str, TMPLEN);
break;
case STL_ARGLISTSTAT:
fillable = false;
// Note: This is important because `append_arg_number` starts appending
// at the end of the null-terminated string.
// Setting the first byte to null means it will place the argument
// number string at the beginning of the buffer.
tmp[0] = 0;
if (append_arg_number(wp, tmp, (int)sizeof(tmp), FALSE))
// Note: The call will only return true if it actually
// appended data to the `tmp` buffer.
if (append_arg_number(wp, tmp, (int)sizeof(tmp), FALSE)) {
str = tmp;
}
break;
case STL_KEYMAP:
@@ -3201,16 +3323,17 @@ build_stl_str_hl (
break;
case STL_OFFSET_X:
base = 'X';
base = HEXIDECIMAL;
case STL_OFFSET:
l = ml_find_line_or_offset(wp->w_buffer, wp->w_cursor.lnum, NULL);
{
long l = ml_find_line_or_offset(wp->w_buffer, wp->w_cursor.lnum, NULL);
num = (wp->w_buffer->b_ml.ml_flags & ML_EMPTY) || l < 0 ?
0L : l + 1 + (!(State & INSERT) && empty_line ?
0 : (int)wp->w_cursor.col);
break;
}
case STL_BYTEVAL_X:
base = 'X';
base = HEXIDECIMAL;
case STL_BYTEVAL:
num = byteval;
if (num == NL)
@@ -3235,6 +3358,8 @@ build_stl_str_hl (
break;
case STL_FILETYPE:
// Copy the filetype if it is not null and the formatted string will fit
// in the temporary buffer (including the brackets and null terminating character)
if (*wp->w_buffer->b_p_ft != NUL
&& STRLEN(wp->w_buffer->b_p_ft) < TMPLEN - 3) {
vim_snprintf((char *)tmp, sizeof(tmp), "[%s]",
@@ -3246,12 +3371,16 @@ build_stl_str_hl (
case STL_FILETYPE_ALT:
{
itemisflag = true;
// Copy the filetype if it is not null and the formatted string will fit
// in the temporary buffer (including the comma and null terminating character)
if (*wp->w_buffer->b_p_ft != NUL
&& STRLEN(wp->w_buffer->b_p_ft) < TMPLEN - 2) {
vim_snprintf((char *)tmp, sizeof(tmp), ",%s",
wp->w_buffer->b_p_ft);
for (char_u *t = tmp; *t != 0; t++)
// Uppercase the file extension
for (char_u *t = tmp; *t != 0; t++) {
*t = TOUPPER_LOC(*t);
}
str = tmp;
}
break;
@@ -3288,24 +3417,35 @@ build_stl_str_hl (
case STL_HIGHLIGHT:
{
//{ The name of the highlight is surrounded by `#`
char_u *t = s;
while (*s != '#' && *s != NUL)
while (*s != '#' && *s != NUL) {
++s;
}
//}
// Create a highlight item based on the name
if (*s == '#') {
item[curitem].type = Highlight;
item[curitem].start = p;
item[curitem].minwid = -syn_namen2id(t, (int)(s - t));
curitem++;
s++;
}
if (*s != NUL)
++s;
continue;
}
}
// If we made it this far, the item is normal and starts at
// our current position in the output buffer.
// Non-normal items would have `continued`.
item[curitem].start = p;
item[curitem].type = Normal;
// Copy the item string into the output buffer
if (str != NULL && *str) {
//{ Skip the leading `,` or ` ` if the item is a flag
// and the proper conditions are met
char_u *t = str;
if (itemisflag) {
if ((t[0] && t[1])
@@ -3314,20 +3454,35 @@ build_stl_str_hl (
t++;
prevchar_isflag = true;
}
l = vim_strsize(t);
if (l > 0)
//}
long l = vim_strsize(t);
// If this item is non-empty, record that the last thing
// we put in the output buffer was an item
if (l > 0) {
prevchar_isitem = true;
}
// If the item is too wide, truncate it from the beginning
if (l > maxwid) {
while (l >= maxwid)
if (has_mbyte) {
l -= ptr2cells(t);
t += (*mb_ptr2len)(t);
} else
} else {
l -= byte2cells(*t++);
}
// Early out if there isn't enough room for the truncation marker
if (p + 1 >= out + outlen)
break;
// Add the truncation marker
*p++ = '<';
}
// If the item is right aligned and not wide enough, pad with fill characters.
if (minwid > 0) {
for (; l < minwid && p + 1 < out + outlen; l++) {
/* Don't put a "-" in front of a digit. */
@@ -3337,8 +3492,13 @@ build_stl_str_hl (
*p++ = fillchar;
}
minwid = 0;
} else
} else {
// Note: The negative value denotes a left aligned item.
// Here we switch the minimum width back to a positive value.
minwid *= -1;
}
//{ Copy the string text into the output buffer
while (*t && p + 1 < out + outlen) {
*p++ = *t++;
/* Change a space by fillchar, unless fillchar is '-' and a
@@ -3347,151 +3507,256 @@ build_stl_str_hl (
&& (!ascii_isdigit(*t) || fillchar != '-'))
p[-1] = fillchar;
}
for (; l < minwid && p + 1 < out + outlen; l++)
*p++ = fillchar;
} else if (num >= 0) {
int nbase = (base == 'D' ? 10 : (base == 'O' ? 8 : 16));
char_u nstr[20];
//}
// For left-aligned items, fill any remaining space with the fillchar
for (; l < minwid && p + 1 < out + outlen; l++) {
*p++ = fillchar;
}
// Otherwise if the item is a number, copy that to the output buffer.
} else if (num >= 0) {
if (p + 20 >= out + outlen)
break; /* not sufficient space */
prevchar_isitem = true;
//{ Build the formatting string
char_u nstr[20];
char_u *t = nstr;
if (opt == STL_VIRTCOL_ALT) {
*t++ = '-';
minwid--;
}
*t++ = '%';
if (zeropad)
if (zeropad) {
*t++ = '0';
*t++ = '*';
*t++ = nbase == 16 ? base : (char_u)(nbase == 8 ? 'o' : 'd');
*t = 0;
}
long n;
for (n = num, l = 1; n >= nbase; n /= nbase)
// Note: The `*` means we take the width as one of the arguments
*t++ = '*';
*t++ = (char_u) (base == HEXIDECIMAL ? 'X' : (base == OCTAL ? 'o' : 'd'));
*t = 0;
//}
//{ Determine how many characters the number will take up when printed
long l;
for (long n = num, l = 1; n >= base; n /= base) {
l++;
if (opt == STL_VIRTCOL_ALT)
}
// VIRTCOL_ALT takes up an extra character because of the `-` we added above.
if (opt == STL_VIRTCOL_ALT) {
l++;
}
//}
size_t remaining_buf_len = (outlen - (p - out));
// If the number is going to take up too much room
// Figure out the approximate number in "scientific" type notation.
// Ex: 14532 with maxwid of 4 -> '14>3'
if (l > maxwid) {
// Add two to the width because the power piece will take two extra characters
l += 2;
n = l - maxwid;
while (l-- > maxwid)
num /= nbase;
// How many extra characters there are
long n = l - maxwid;
//{ Reduce the number by base^n
while (l-- > maxwid) {
num /= base;
}
//}
//{ Add the format string for the exponent bit
*t++ = '>';
*t++ = '%';
// Use the same base as the first number
*t = t[-3];
*++t = 0;
vim_snprintf((char *)p, outlen - (p - out), (char *)nstr,
0, num, n);
} else
vim_snprintf((char *)p, outlen - (p - out), (char *)nstr,
minwid, num);
p += STRLEN(p);
} else
item[curitem].type = Empty;
//}
if (opt == STL_VIM_EXPR)
vim_snprintf((char *)p, remaining_buf_len, (char *)nstr,
0, num, n);
} else {
vim_snprintf((char *)p, remaining_buf_len, (char *)nstr,
minwid, num);
}
// Advance the output buffer position to the end of the number we just printed
p += STRLEN(p);
// Otherwise, there was nothing to print so mark the item as empty
} else {
item[curitem].type = Empty;
}
// Free the string buffer if we allocated it.
// Note: This is not needed if `str` is pointing at `tmp`
if (opt == STL_VIM_EXPR) {
xfree(str);
}
if (num >= 0 || (!itemisflag && str && *str))
prevchar_isflag = false; /* Item not NULL, but not a flag */
// Item processed, move to the next
curitem++;
}
// Null terminate the output buffer
*p = NUL;
int itemcnt = curitem;
if (usefmt != fmt)
// Free the format buffer if we allocated it internally
if (usefmt != fmt) {
xfree(usefmt);
}
int width = vim_strsize(out);
if (maxwidth > 0 && width > maxwidth) {
/* Result is too long, must truncate somewhere. */
long l = 0;
if (itemcnt == 0)
s = out;
else {
for (; l < itemcnt; l++)
if (item[l].type == Trunc) {
/* Truncate at %< item. */
s = item[l].start;
int item_idx = 0;
char_u *trunc_p;
// If there are no items, truncate from beginning
if (itemcnt == 0) {
trunc_p = out;
// Otherwise, look for the truncation item
} else {
// Default to truncating at the first item
trunc_p = item[0].start;
item_idx = 0;
for (int i; i < itemcnt; i++)
if (item[i].type == Trunc) {
// Truncate at %< item.
trunc_p = item[i].start;
item_idx = i;
break;
}
if (l == itemcnt) {
/* No %< item, truncate first item. */
s = item[0].start;
l = 0;
}
}
if (width - vim_strsize(s) >= maxwidth) {
/* Truncation mark is beyond max length */
// If the truncation point we found is beyond the maximum
// length of the string, truncate the end of the string.
if (width - vim_strsize(trunc_p) >= maxwidth) {
// If we are using a multi-byte encoding, walk from the beginning of the
// string to find the last character that will fit.
if (has_mbyte) {
s = out;
trunc_p = out;
width = 0;
for (;; ) {
width += ptr2cells(s);
width += ptr2cells(trunc_p);
if (width >= maxwidth)
break;
s += (*mb_ptr2len)(s);
// Note: Only advance the pointer if the next
// character will fit in the available output space
trunc_p += (*mb_ptr2len)(trunc_p);
}
/* Fill up for half a double-wide character. */
while (++width < maxwidth)
*s++ = fillchar;
} else
s = out + maxwidth - 1;
for (l = 0; l < itemcnt; l++)
if (item[l].start > s)
break;
itemcnt = l;
*s++ = '>';
*s = 0;
} else {
long n;
if (has_mbyte) {
n = 0;
while (width >= maxwidth) {
width -= ptr2cells(s + n);
n += (*mb_ptr2len)(s + n);
// XXX : This seems impossible given the exit condition above?
while (++width < maxwidth) {
*trunc_p++ = fillchar;
}
} else
n = width - maxwidth + 1;
p = s + n;
STRMOVE(s + 1, p);
*s = '<';
// Otherwise put the truncation point at the end, leaving enough room
// for a single-character truncation marker
} else {
trunc_p = out + maxwidth - 1;
}
// Ignore any items in the statusline that occur after
// the truncation point
for (int i = 0; i < itemcnt; i++) {
if (item[i].start > trunc_p) {
itemcnt = i;
break;
}
}
// Truncate the output
*trunc_p++ = '>';
*trunc_p = 0;
// Truncate at the truncation point we found
} else {
//{ Determine how many bytes to remove
long trunc_len;
if (has_mbyte) {
trunc_len = 0;
while (width >= maxwidth) {
width -= ptr2cells(trunc_p + trunc_len);
trunc_len += (*mb_ptr2len)(trunc_p + trunc_len);
}
} else {
// Truncate an extra character so we can insert our `<`.
trunc_len = (width - maxwidth) + 1;
}
//}
//{ Truncate the string
char_u *trunc_end_p = trunc_p + trunc_len;
STRMOVE(trunc_p + 1, trunc_end_p);
// Put a `<` to mark where we truncated at
*trunc_p = '<';
// Advance the pointer to the end of the string
trunc_p = trunc_p + STRLEN(trunc_p);
/* Fill up for half a double-wide character. */
while (++width < maxwidth) {
s = s + STRLEN(s);
*s++ = fillchar;
*s = NUL;
*trunc_p++ = fillchar;
*trunc_p = NUL;
}
//}
--n; /* count the '<' */
for (; l < itemcnt; l++) {
if (item[l].start - n >= s)
item[l].start -= n;
else
item[l].start = s;
//{ Change the start point for items based on
// their position relative to our truncation point
// Note: The offset is one less than the truncation length because
// the truncation marker `<` is not counted.
long item_offset = trunc_len - 1;
for (int i = item_idx; i < itemcnt; i++) {
// Items starting at or after the end of the truncated section need
// to be moved backwards.
if (item[i].start >= trunc_end_p) {
item[i].start -= item_offset;
// Anything inside the truncated area is set to start at the `<` truncation character.
} else {
item[i].start = trunc_p;
}
}
//}
}
width = maxwidth;
} else if (width < maxwidth && STRLEN(out) + maxwidth - width + 1 <
outlen) {
/* Apply STL_MIDDLE if any */
for (long l = 0; l < itemcnt; l++)
if (item[l].type == Middle) {
p = item[l].start + maxwidth - width;
STRMOVE(p, item[l].start);
for (s = item[l].start; s < p; s++)
// If there is room left in our statusline, and room left in our buffer,
// add characters at the middle marker (if there is one) to fill up the available space.
} else if (width < maxwidth
&& STRLEN(out) + maxwidth - width + 1 < outlen) {
for (int item_idx = 0; item_idx < itemcnt; item_idx++) {
if (item[item_idx].type == Middle) {
// Move the statusline to make room for the middle characters
char_u *middle_end = item[item_idx].start + (maxwidth - width);
STRMOVE(middle_end, item[item_idx].start);
// Fill the middle section with our fill character
for (char_u *s = item[item_idx].start; s < middle_end; s++)
*s = fillchar;
for (l++; l < itemcnt; l++)
item[l].start += maxwidth - width;
width = maxwidth;
// Adjust the offset of any items after the middle
for (item_idx++; item_idx < itemcnt; item_idx++)
item[item_idx].start += maxwidth - width;
width = maxwidth;
break;
}
}
}
/* Store the info about highlighting. */
if (hltab != NULL) {