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Commit | Line | Data |
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7499c996 | 1 | #include "builtin.h" |
9690c118 | 2 | #include "cache.h" |
a3e870f2 LT |
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 | 9 | static size_t cleanup(char *line, size_t len) |
a3e870f2 | 10 | { |
6d69b6f6 KH |
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; |
a3e870f2 LT |
19 | } |
20 | ||
9690c118 CR |
21 | /* |
22 | * Remove empty lines from the beginning and end | |
23 | * and also trailing spaces from every line. | |
24 | * | |
975e0daf CR |
25 | * Note that the buffer will not be NUL-terminated. |
26 | * | |
9690c118 CR |
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 | * |
9690c118 CR |
35 | * Enable skip_comments to skip every line starting with "#". |
36 | */ | |
6d69b6f6 | 37 | void stripspace(struct strbuf *sb, int skip_comments) |
a3e870f2 | 38 | { |
6d69b6f6 | 39 | int empties = 0; |
975e0daf CR |
40 | size_t i, j, len, newlen; |
41 | char *eol; | |
9690c118 | 42 | |
6d69b6f6 KH |
43 | /* We may have to add a newline. */ |
44 | strbuf_grow(sb, 1); | |
a3e870f2 | 45 | |
6d69b6f6 KH |
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); |
a3e870f2 LT |
55 | |
56 | /* Not just an empty line? */ | |
975e0daf | 57 | if (newlen) { |
6d69b6f6 KH |
58 | if (empties > 0 && j > 0) |
59 | sb->buf[j++] = '\n'; | |
a3e870f2 | 60 | empties = 0; |
6d69b6f6 KH |
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 LS |
69 | } |
70 | ||
a633fca0 | 71 | int cmd_stripspace(int argc, const char **argv, const char *prefix) |
7499c996 | 72 | { |
fd17f5b5 | 73 | struct strbuf buf; |
f653aee5 JS |
74 | int strip_comments = 0; |
75 | ||
76 | if (argc > 1 && (!strcmp(argv[1], "-s") || | |
77 | !strcmp(argv[1], "--strip-comments"))) | |
78 | strip_comments = 1; | |
975e0daf | 79 | |
fd17f5b5 PH |
80 | strbuf_init(&buf, 0); |
81 | if (strbuf_read(&buf, 0, 1024) < 0) | |
975e0daf CR |
82 | die("could not read the input"); |
83 | ||
6d69b6f6 | 84 | stripspace(&buf, strip_comments); |
975e0daf | 85 | |
fd17f5b5 PH |
86 | write_or_die(1, buf.buf, buf.len); |
87 | strbuf_release(&buf); | |
a3e870f2 LT |
88 | return 0; |
89 | } |