builtin-grep: do not use setup_revisions()
[git.git] / stripspace.c
1 #include <stdio.h>
2 #include <string.h>
3 #include <ctype.h>
4
5 /*
6  * Remove empty lines from the beginning and end.
7  *
8  * Turn multiple consecutive empty lines into just one
9  * empty line.  Return true if it is an incomplete line.
10  */
11 static int cleanup(char *line)
12 {
13         int len = strlen(line);
14
15         if (len && line[len-1] == '\n') {
16                 if (len == 1)
17                         return 0;
18                 do {
19                         unsigned char c = line[len-2];
20                         if (!isspace(c))
21                                 break;
22                         line[len-2] = '\n';
23                         len--;
24                         line[len] = 0;
25                 } while (len > 1);
26                 return 0;
27         }
28         return 1;
29 }
30
31 int main(int argc, char **argv)
32 {
33         int empties = -1;
34         int incomplete = 0;
35         char line[1024];
36
37         while (fgets(line, sizeof(line), stdin)) {
38                 incomplete = cleanup(line);
39
40                 /* Not just an empty line? */
41                 if (line[0] != '\n') {
42                         if (empties > 0)
43                                 putchar('\n');
44                         empties = 0;
45                         fputs(line, stdout);
46                         continue;
47                 }
48                 if (empties < 0)
49                         continue;
50                 empties++;
51         }
52         if (incomplete)
53                 putchar('\n');
54         return 0;
55 }