void strbuf_utf8_replace(struct strbuf *sb_src, int pos, int width,
const char *subst)
{
struct strbuf sb_dst = STRBUF_INIT;
char *src = sb_src->buf;
char *end = src + sb_src->len;
char *dst;
int w = 0, subst_len = 0;
if (subst)
subst_len = strlen(subst);
strbuf_grow(&sb_dst, sb_src->len + subst_len);
dst = sb_dst.buf;
while (src < end) {
char *old;
size_t n;
while ((n = display_mode_esc_sequence_len(src))) {
memcpy(dst, src, n);
src += n;
dst += n;
}
if (src >= end)
break;
old = src;
n = utf8_width((const char**)&src, NULL);
if (!src) /* broken utf-8, do nothing */
return;
if (n && w >= pos && w < pos + width) {
if (subst) {
memcpy(dst, subst, subst_len);
dst += subst_len;
subst = NULL;
}
w += n;
continue;
}
memcpy(dst, old, src - old);
dst += src - old;
w += n;
}
strbuf_setlen(&sb_dst, dst - sb_dst.buf);
strbuf_swap(sb_src, &sb_dst);
strbuf_release(&sb_dst);
}
/*
* Returns the total number of columns required by a null-terminated
* string, assuming that the string is utf8. Returns strlen() instead
* if the string does not look like a valid utf8 string.
*/
int utf8_strnwidth(const char *string, int len, int skip_ansi)
{
int width = 0;
const char *orig = string;
if (len == -1)
len = strlen(string);
while (string && string < orig + len) {
int skip;
while (skip_ansi &&
(skip = display_mode_esc_sequence_len(string)) != 0)
string += skip;
width += utf8_width(&string, NULL);
}
return string ? width : len;
}
static size_t format_and_pad_commit(struct strbuf *sb, /* in UTF-8 */
const char *placeholder,
struct format_commit_context *c)
{
struct strbuf local_sb = STRBUF_INIT;
int total_consumed = 0, len, padding = c->padding;
if (padding < 0) {
const char *start = strrchr(sb->buf, '\n');
int occupied;
if (!start)
start = sb->buf;
occupied = utf8_strnwidth(start, -1, 1);
padding = (-padding) - occupied;
}
while (1) {
int modifier = *placeholder == 'C';
int consumed = format_commit_one(&local_sb, placeholder, c);
total_consumed += consumed;
if (!modifier)
break;
placeholder += consumed;
if (*placeholder != '%')
break;
placeholder++;
total_consumed++;
}
len = utf8_strnwidth(local_sb.buf, -1, 1);
if (c->flush_type == flush_left_and_steal) {
const char *ch = sb->buf + sb->len - 1;
while (len > padding && ch > sb->buf) {
const char *p;
if (*ch == ' ') {
ch--;
padding++;
continue;
}
/* check for trailing ansi sequences */
if (*ch != 'm')
break;
p = ch - 1;
while (ch - p < 10 && *p != '\033')
p--;
if (*p != '\033' ||
ch + 1 - p != display_mode_esc_sequence_len(p))
break;
/*
* got a good ansi sequence, put it back to
* local_sb as we're cutting sb
*/
strbuf_insert(&local_sb, 0, p, ch + 1 - p);
ch = p - 1;
}
strbuf_setlen(sb, ch + 1 - sb->buf);
c->flush_type = flush_left;
}
if (len > padding) {
switch (c->truncate) {
case trunc_left:
strbuf_utf8_replace(&local_sb,
0, len - (padding - 2),
"..");
break;
case trunc_middle:
strbuf_utf8_replace(&local_sb,
padding / 2 - 1,
len - (padding - 2),
"..");
break;
case trunc_right:
strbuf_utf8_replace(&local_sb,
padding - 2, len - (padding - 2),
"..");
break;
case trunc_none:
break;
}
strbuf_addbuf(sb, &local_sb);
} else {
int sb_len = sb->len, offset = 0;
if (c->flush_type == flush_left)
offset = padding - len;
else if (c->flush_type == flush_both)
offset = (padding - len) / 2;
/*
* we calculate padding in columns, now
* convert it back to chars
*/
padding = padding - len + local_sb.len;
strbuf_grow(sb, padding);
strbuf_setlen(sb, sb_len + padding);
memset(sb->buf + sb_len, ' ', sb->len - sb_len);
memcpy(sb->buf + sb_len + offset, local_sb.buf,
local_sb.len);
}
strbuf_release(&local_sb);
c->flush_type = no_flush;
return total_consumed;
}
/*
* Wrap the text, if necessary. The variable indent is the indent for the
* first line, indent2 is the indent for all other lines.
* If indent is negative, assume that already -indent columns have been
* consumed (and no extra indent is necessary for the first line).
*/
int strbuf_add_wrapped_text(struct strbuf *buf,
const char *text, int indent1, int indent2, int width)
{
int indent, w, assume_utf8 = 1;
const char *bol, *space, *start = text;
size_t orig_len = buf->len;
if (width <= 0) {
strbuf_add_indented_text(buf, text, indent1, indent2);
return 1;
}
retry:
bol = text;
w = indent = indent1;
space = NULL;
if (indent < 0) {
w = -indent;
space = text;
}
for (;;) {
char c;
size_t skip;
while ((skip = display_mode_esc_sequence_len(text)))
text += skip;
c = *text;
if (!c || isspace(c)) {
if (w < width || !space) {
const char *start = bol;
if (!c && text == start)
return w;
if (space)
start = space;
else
strbuf_addchars(buf, ' ', indent);
strbuf_add(buf, start, text - start);
if (!c)
return w;
space = text;
if (c == '\t')
w |= 0x07;
else if (c == '\n') {
space++;
if (*space == '\n') {
strbuf_addch(buf, '\n');
goto new_line;
}
else if (!isalnum(*space))
goto new_line;
else
strbuf_addch(buf, ' ');
}
w++;
text++;
}
else {
new_line:
strbuf_addch(buf, '\n');
text = bol = space + isspace(*space);
space = NULL;
w = indent = indent2;
}
continue;
}
if (assume_utf8) {
w += utf8_width(&text, NULL);
if (!text) {
assume_utf8 = 0;
text = start;
strbuf_setlen(buf, orig_len);
goto retry;
}
} else {
w++;
text++;
}
}
}
/*
* Wrap the text, if necessary. The variable indent is the indent for the
* first line, indent2 is the indent for all other lines.
* If indent is negative, assume that already -indent columns have been
* consumed (and no extra indent is necessary for the first line).
*/
int strbuf_add_wrapped_text(struct strbuf *buf,
const char *text, int indent, int indent2, int width)
{
int w = indent, assume_utf8 = is_utf8(text);
const char *bol = text, *space = NULL;
if (width <= 0) {
strbuf_add_indented_text(buf, text, indent, indent2);
return 1;
}
if (indent < 0) {
w = -indent;
space = text;
}
for (;;) {
char c;
size_t skip;
while ((skip = display_mode_esc_sequence_len(text)))
text += skip;
c = *text;
if (!c || isspace(c)) {
if (w < width || !space) {
const char *start = bol;
if (!c && text == start)
return w;
if (space)
start = space;
else
print_spaces(buf, indent);
strbuf_write(buf, start, text - start);
if (!c)
return w;
space = text;
if (c == '\t')
w |= 0x07;
else if (c == '\n') {
space++;
if (*space == '\n') {
strbuf_write(buf, "\n", 1);
goto new_line;
}
else if (!isalnum(*space))
goto new_line;
else
strbuf_write(buf, " ", 1);
}
w++;
text++;
}
else {
new_line:
strbuf_write(buf, "\n", 1);
text = bol = space + isspace(*space);
space = NULL;
w = indent = indent2;
}
continue;
}
if (assume_utf8)
w += utf8_width(&text, NULL);
else {
w++;
text++;
}
}
}
