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#include "builtin.h"
#include "cache.h"
/*
* Returns the length of a line, without trailing spaces.
*
* If the line ends with newline, it will be removed too.
*/
static size_t cleanup(char *line, size_t len)
{
while (len) {
unsigned char c = line[len - 1];
if (!isspace(c))
break;
len--;
}
return len;
}
/*
* Remove empty lines from the beginning and end
* and also trailing spaces from every line.
*
* Turn multiple consecutive empty lines between paragraphs
* into just one empty line.
*
* If the input has only empty lines and spaces,
* no output will be produced.
*
* If last line does not have a newline at the end, one is added.
*
* Enable skip_comments to skip every line starting with comment
* character.
*/
void stripspace(struct strbuf *sb, int skip_comments)
{
int empties = 0;
size_t i, j, len, newlen;
char *eol;
/* We may have to add a newline. */
strbuf_grow(sb, 1);
for (i = j = 0; i < sb->len; i += len, j += newlen) {
eol = memchr(sb->buf + i, '\n', sb->len - i);
len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
if (skip_comments && len && sb->buf[i] == comment_line_char) {
newlen = 0;
continue;
}
newlen = cleanup(sb->buf + i, len);
/* Not just an empty line? */
if (newlen) {
if (empties > 0 && j > 0)
sb->buf[j++] = '\n';
empties = 0;
memmove(sb->buf + j, sb->buf + i, newlen);
sb->buf[newlen + j++] = '\n';
} else {
empties++;
}
}
strbuf_setlen(sb, j);
}
static void comment_lines(struct strbuf *buf)
{
char *msg;
size_t len;
msg = strbuf_detach(buf, &len);
strbuf_add_commented_lines(buf, msg, len);
free(msg);
}
static const char *usage_msg = "\n"
" git stripspace [-s | --strip-comments] < input\n"
" git stripspace [-c | --comment-lines] < input";
int cmd_stripspace(int argc, const char **argv, const char *prefix)
{
struct strbuf buf = STRBUF_INIT;
int strip_comments = 0;
enum { INVAL = 0, STRIP_SPACE = 1, COMMENT_LINES = 2 } mode = STRIP_SPACE;
if (argc == 2) {
if (!strcmp(argv[1], "-s") ||
!strcmp(argv[1], "--strip-comments")) {
strip_comments = 1;
} else if (!strcmp(argv[1], "-c") ||
!strcmp(argv[1], "--comment-lines")) {
mode = COMMENT_LINES;
} else {
mode = INVAL;
}
} else if (argc > 1) {
mode = INVAL;
}
if (mode == INVAL)
usage(usage_msg);
if (strip_comments || mode == COMMENT_LINES)
git_config(git_default_config, NULL);
if (strbuf_read(&buf, 0, 1024) < 0)
die_errno("could not read the input");
if (mode == STRIP_SPACE)
stripspace(&buf, strip_comments);
else
comment_lines(&buf);
write_or_die(1, buf.buf, buf.len);
strbuf_release(&buf);
return 0;
}
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