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