#include "builtin.h"
+#include "cache.h"
/*
- * Remove empty lines from the beginning and end.
+ * Returns the length of a line, without trailing spaces.
*
- * Turn multiple consecutive empty lines into just one
- * empty line. Return true if it is an incomplete line.
+ * If the line ends with newline, it will be removed too.
*/
-static int cleanup(char *line)
+static size_t cleanup(char *line, size_t len)
{
- int len = strlen(line);
-
- if (len && line[len-1] == '\n') {
- if (len == 1)
- return 0;
- do {
- unsigned char c = line[len-2];
- if (!isspace(c))
- break;
- line[len-2] = '\n';
- len--;
- line[len] = 0;
- } while (len > 1);
- return 0;
+ while (len) {
+ unsigned char c = line[len - 1];
+ if (!isspace(c))
+ break;
+ len--;
}
- return 1;
+
+ return len;
}
-static void stripspace(FILE *in, FILE *out)
+/*
+ * 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 = -1;
- int incomplete = 0;
- char line[1024];
+ int empties = 0;
+ size_t i, j, len, newlen;
+ char *eol;
- while (fgets(line, sizeof(line), in)) {
- incomplete = cleanup(line);
+ /* 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 (line[0] != '\n') {
- if (empties > 0)
- fputc('\n', out);
+ if (newlen) {
+ if (empties > 0 && j > 0)
+ sb->buf[j++] = '\n';
empties = 0;
- fputs(line, out);
- continue;
+ memmove(sb->buf + j, sb->buf + i, newlen);
+ sb->buf[newlen + j++] = '\n';
+ } else {
+ empties++;
}
- if (empties < 0)
- continue;
- empties++;
}
- if (incomplete)
- fputc('\n', out);
+
+ strbuf_setlen(sb, j);
}
int cmd_stripspace(int argc, const char **argv, const char *prefix)
{
- stripspace(stdin, stdout);
+ struct strbuf buf;
+ int strip_comments = 0;
+
+ if (argc > 1 && (!strcmp(argv[1], "-s") ||
+ !strcmp(argv[1], "--strip-comments")))
+ strip_comments = 1;
+
+ strbuf_init(&buf, 0);
+ 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;
}