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1 | #include "builtin.h" | |
2 | #include "cache.h" | |
3 | ||
4 | /* | |
5 | * Returns the length of a line, without trailing spaces. | |
6 | * | |
7 | * If the line ends with newline, it will be removed too. | |
8 | */ | |
9 | static size_t cleanup(char *line, size_t len) | |
10 | { | |
11 | while (len) { | |
12 | unsigned char c = line[len - 1]; | |
13 | if (!isspace(c)) | |
14 | break; | |
15 | len--; | |
16 | } | |
17 | ||
18 | return len; | |
19 | } | |
20 | ||
21 | /* | |
22 | * Remove empty lines from the beginning and end | |
23 | * and also trailing spaces from every line. | |
24 | * | |
25 | * Note that the buffer will not be NUL-terminated. | |
26 | * | |
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 | * | |
33 | * If last line does not have a newline at the end, one is added. | |
34 | * | |
35 | * Enable skip_comments to skip every line starting with "#". | |
36 | */ | |
37 | void stripspace(struct strbuf *sb, int skip_comments) | |
38 | { | |
39 | int empties = 0; | |
40 | size_t i, j, len, newlen; | |
41 | char *eol; | |
42 | ||
43 | /* We may have to add a newline. */ | |
44 | strbuf_grow(sb, 1); | |
45 | ||
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] == '#') { | |
51 | newlen = 0; | |
52 | continue; | |
53 | } | |
54 | newlen = cleanup(sb->buf + i, len); | |
55 | ||
56 | /* Not just an empty line? */ | |
57 | if (newlen) { | |
58 | if (empties > 0 && j > 0) | |
59 | sb->buf[j++] = '\n'; | |
60 | empties = 0; | |
61 | memmove(sb->buf + j, sb->buf + i, newlen); | |
62 | sb->buf[newlen + j++] = '\n'; | |
63 | } else { | |
64 | empties++; | |
65 | } | |
66 | } | |
67 | ||
68 | strbuf_setlen(sb, j); | |
69 | } | |
70 | ||
71 | int cmd_stripspace(int argc, const char **argv, const char *prefix) | |
72 | { | |
73 | struct strbuf buf = STRBUF_INIT; | |
74 | int strip_comments = 0; | |
75 | ||
76 | if (argc > 1 && (!strcmp(argv[1], "-s") || | |
77 | !strcmp(argv[1], "--strip-comments"))) | |
78 | strip_comments = 1; | |
79 | ||
80 | if (strbuf_read(&buf, 0, 1024) < 0) | |
81 | die_errno("could not read the input"); | |
82 | ||
83 | stripspace(&buf, strip_comments); | |
84 | ||
85 | write_or_die(1, buf.buf, buf.len); | |
86 | strbuf_release(&buf); | |
87 | return 0; | |
88 | } |