Commit | Line | Data |
---|---|---|
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 | * | |
25 | * Turn multiple consecutive empty lines between paragraphs | |
26 | * into just one empty line. | |
27 | * | |
28 | * If the input has only empty lines and spaces, | |
29 | * no output will be produced. | |
30 | * | |
6d69b6f6 | 31 | * If last line does not have a newline at the end, one is added. |
975e0daf | 32 | * |
eff80a9f JH |
33 | * Enable skip_comments to skip every line starting with comment |
34 | * character. | |
9690c118 | 35 | */ |
6d69b6f6 | 36 | void stripspace(struct strbuf *sb, int skip_comments) |
a3e870f2 | 37 | { |
6d69b6f6 | 38 | int empties = 0; |
975e0daf CR |
39 | size_t i, j, len, newlen; |
40 | char *eol; | |
9690c118 | 41 | |
6d69b6f6 KH |
42 | /* We may have to add a newline. */ |
43 | strbuf_grow(sb, 1); | |
a3e870f2 | 44 | |
6d69b6f6 KH |
45 | for (i = j = 0; i < sb->len; i += len, j += newlen) { |
46 | eol = memchr(sb->buf + i, '\n', sb->len - i); | |
47 | len = eol ? eol - (sb->buf + i) + 1 : sb->len - i; | |
48 | ||
eff80a9f | 49 | if (skip_comments && len && sb->buf[i] == comment_line_char) { |
975e0daf | 50 | newlen = 0; |
9690c118 | 51 | continue; |
975e0daf | 52 | } |
6d69b6f6 | 53 | newlen = cleanup(sb->buf + i, len); |
a3e870f2 LT |
54 | |
55 | /* Not just an empty line? */ | |
975e0daf | 56 | if (newlen) { |
6d69b6f6 KH |
57 | if (empties > 0 && j > 0) |
58 | sb->buf[j++] = '\n'; | |
a3e870f2 | 59 | empties = 0; |
6d69b6f6 KH |
60 | memmove(sb->buf + j, sb->buf + i, newlen); |
61 | sb->buf[newlen + j++] = '\n'; | |
62 | } else { | |
63 | empties++; | |
a3e870f2 | 64 | } |
a3e870f2 | 65 | } |
975e0daf | 66 | |
6d69b6f6 | 67 | strbuf_setlen(sb, j); |
7499c996 LS |
68 | } |
69 | ||
eff80a9f JH |
70 | static void comment_lines(struct strbuf *buf) |
71 | { | |
72 | char *msg; | |
73 | size_t len; | |
74 | ||
75 | msg = strbuf_detach(buf, &len); | |
76 | strbuf_add_commented_lines(buf, msg, len); | |
77 | free(msg); | |
78 | } | |
79 | ||
80 | static const char *usage_msg = "\n" | |
81 | " git stripspace [-s | --strip-comments] < input\n" | |
82 | " git stripspace [-c | --comment-lines] < input"; | |
83 | ||
a633fca0 | 84 | int cmd_stripspace(int argc, const char **argv, const char *prefix) |
7499c996 | 85 | { |
f285a2d7 | 86 | struct strbuf buf = STRBUF_INIT; |
f653aee5 | 87 | int strip_comments = 0; |
eff80a9f JH |
88 | enum { INVAL = 0, STRIP_SPACE = 1, COMMENT_LINES = 2 } mode = STRIP_SPACE; |
89 | ||
90 | if (argc == 2) { | |
91 | if (!strcmp(argv[1], "-s") || | |
92 | !strcmp(argv[1], "--strip-comments")) { | |
93 | strip_comments = 1; | |
94 | } else if (!strcmp(argv[1], "-c") || | |
95 | !strcmp(argv[1], "--comment-lines")) { | |
96 | mode = COMMENT_LINES; | |
97 | } else { | |
98 | mode = INVAL; | |
99 | } | |
100 | } else if (argc > 1) { | |
101 | mode = INVAL; | |
102 | } | |
103 | ||
104 | if (mode == INVAL) | |
105 | usage(usage_msg); | |
f653aee5 | 106 | |
eff80a9f JH |
107 | if (strip_comments || mode == COMMENT_LINES) |
108 | git_config(git_default_config, NULL); | |
975e0daf | 109 | |
fd17f5b5 | 110 | if (strbuf_read(&buf, 0, 1024) < 0) |
0721c314 | 111 | die_errno("could not read the input"); |
975e0daf | 112 | |
eff80a9f JH |
113 | if (mode == STRIP_SPACE) |
114 | stripspace(&buf, strip_comments); | |
115 | else | |
116 | comment_lines(&buf); | |
975e0daf | 117 | |
fd17f5b5 PH |
118 | write_or_die(1, buf.buf, buf.len); |
119 | strbuf_release(&buf); | |
a3e870f2 LT |
120 | return 0; |
121 | } |