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