gitweb: '--cc' for merges in 'commitdiff' view
[git] / builtin-stripspace.c
1 #include "builtin.h"
2
3 /*
4  * Remove empty lines from the beginning and end.
5  *
6  * Turn multiple consecutive empty lines into just one
7  * empty line.  Return true if it is an incomplete line.
8  */
9 static int cleanup(char *line)
10 {
11         int len = strlen(line);
12
13         if (len && line[len-1] == '\n') {
14                 if (len == 1)
15                         return 0;
16                 do {
17                         unsigned char c = line[len-2];
18                         if (!isspace(c))
19                                 break;
20                         line[len-2] = '\n';
21                         len--;
22                         line[len] = 0;
23                 } while (len > 1);
24                 return 0;
25         }
26         return 1;
27 }
28
29 static void stripspace(FILE *in, FILE *out)
30 {
31         int empties = -1;
32         int incomplete = 0;
33         char line[1024];
34
35         while (fgets(line, sizeof(line), in)) {
36                 incomplete = cleanup(line);
37
38                 /* Not just an empty line? */
39                 if (line[0] != '\n') {
40                         if (empties > 0)
41                                 fputc('\n', out);
42                         empties = 0;
43                         fputs(line, out);
44                         continue;
45                 }
46                 if (empties < 0)
47                         continue;
48                 empties++;
49         }
50         if (incomplete)
51                 fputc('\n', out);
52 }
53
54 int cmd_stripspace(int argc, const char **argv, const char *prefix)
55 {
56         stripspace(stdin, stdout);
57         return 0;
58 }