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7499c996 1#include "builtin.h"
9690c118 2#include "cache.h"
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3
4/*
975e0daf 5 * Returns the length of a line, without trailing spaces.
a3e870f2 6 *
9690c118 7 * If the line ends with newline, it will be removed too.
a3e870f2 8 */
975e0daf 9static size_t cleanup(char *line, size_t len)
a3e870f2 10{
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11 while (len) {
12 unsigned char c = line[len - 1];
13 if (!isspace(c))
14 break;
15 len--;
a3e870f2 16 }
6d69b6f6 17
9690c118 18 return len;
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19}
20
9690c118
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21/*
22 * Remove empty lines from the beginning and end
23 * and also trailing spaces from every line.
24 *
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25 * Note that the buffer will not be NUL-terminated.
26 *
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27 * Turn multiple consecutive empty lines between paragraphs
28 * into just one empty line.
29 *
30 * If the input has only empty lines and spaces,
31 * no output will be produced.
32 *
6d69b6f6 33 * If last line does not have a newline at the end, one is added.
975e0daf 34 *
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35 * Enable skip_comments to skip every line starting with "#".
36 */
6d69b6f6 37void stripspace(struct strbuf *sb, int skip_comments)
a3e870f2 38{
6d69b6f6 39 int empties = 0;
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40 size_t i, j, len, newlen;
41 char *eol;
9690c118 42
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43 /* We may have to add a newline. */
44 strbuf_grow(sb, 1);
a3e870f2 45
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46 for (i = j = 0; i < sb->len; i += len, j += newlen) {
47 eol = memchr(sb->buf + i, '\n', sb->len - i);
48 len = eol ? eol - (sb->buf + i) + 1 : sb->len - i;
49
50 if (skip_comments && len && sb->buf[i] == '#') {
975e0daf 51 newlen = 0;
9690c118 52 continue;
975e0daf 53 }
6d69b6f6 54 newlen = cleanup(sb->buf + i, len);
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55
56 /* Not just an empty line? */
975e0daf 57 if (newlen) {
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58 if (empties > 0 && j > 0)
59 sb->buf[j++] = '\n';
a3e870f2 60 empties = 0;
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61 memmove(sb->buf + j, sb->buf + i, newlen);
62 sb->buf[newlen + j++] = '\n';
63 } else {
64 empties++;
a3e870f2 65 }
a3e870f2 66 }
975e0daf 67
6d69b6f6 68 strbuf_setlen(sb, j);
7499c996
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69}
70
a633fca0 71int cmd_stripspace(int argc, const char **argv, const char *prefix)
7499c996 72{
f285a2d7 73 struct strbuf buf = STRBUF_INIT;
f653aee5
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74 int strip_comments = 0;
75
4751f112 76 if (argc == 2 && (!strcmp(argv[1], "-s") ||
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77 !strcmp(argv[1], "--strip-comments")))
78 strip_comments = 1;
4751f112
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79 else if (argc > 1)
80 usage("git stripspace [-s | --strip-comments] < <stream>");
975e0daf 81
fd17f5b5 82 if (strbuf_read(&buf, 0, 1024) < 0)
0721c314 83 die_errno("could not read the input");
975e0daf 84
6d69b6f6 85 stripspace(&buf, strip_comments);
975e0daf 86
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87 write_or_die(1, buf.buf, buf.len);
88 strbuf_release(&buf);
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89 return 0;
90}