git-send-email: Add --thread option
[git/aroben.git] / builtin-stripspace.c
blob62bd4b547b8c7efaa982cef61edf365466089eb6
1 #include "builtin.h"
3 /*
4 * Remove empty lines from the beginning and end.
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)
11 int len = strlen(line);
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;
26 return 1;
29 static void stripspace(FILE *in, FILE *out)
31 int empties = -1;
32 int incomplete = 0;
33 char line[1024];
35 while (fgets(line, sizeof(line), in)) {
36 incomplete = cleanup(line);
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;
46 if (empties < 0)
47 continue;
48 empties++;
50 if (incomplete)
51 fputc('\n', out);
54 int cmd_stripspace(int argc, const char **argv, const char *prefix)
56 stripspace(stdin, stdout);
57 return 0;