provide a facility for "delayed" progress reporting
[git] / builtin-merge-file.c
1 #include "cache.h"
2 #include "xdiff/xdiff.h"
3 #include "xdiff-interface.h"
4
5 static const char merge_file_usage[] =
6 "git merge-file [-p | --stdout] [-q | --quiet] [-L name1 [-L orig [-L name2]]] file1 orig_file file2";
7
8 int cmd_merge_file(int argc, char **argv, char **envp)
9 {
10         char *names[3];
11         mmfile_t mmfs[3];
12         mmbuffer_t result = {NULL, 0};
13         xpparam_t xpp = {XDF_NEED_MINIMAL};
14         int ret = 0, i = 0, to_stdout = 0;
15
16         while (argc > 4) {
17                 if (!strcmp(argv[1], "-L") && i < 3) {
18                         names[i++] = argv[2];
19                         argc--;
20                         argv++;
21                 } else if (!strcmp(argv[1], "-p") ||
22                                 !strcmp(argv[1], "--stdout"))
23                         to_stdout = 1;
24                 else if (!strcmp(argv[1], "-q") ||
25                                 !strcmp(argv[1], "--quiet"))
26                         freopen("/dev/null", "w", stderr);
27                 else
28                         usage(merge_file_usage);
29                 argc--;
30                 argv++;
31         }
32
33         if (argc != 4)
34                 usage(merge_file_usage);
35
36         for (; i < 3; i++)
37                 names[i] = argv[i + 1];
38
39         for (i = 0; i < 3; i++)
40                 if (read_mmfile(mmfs + i, argv[i + 1]))
41                         return -1;
42
43         ret = xdl_merge(mmfs + 1, mmfs + 0, names[0], mmfs + 2, names[2],
44                         &xpp, XDL_MERGE_ZEALOUS, &result);
45
46         for (i = 0; i < 3; i++)
47                 free(mmfs[i].ptr);
48
49         if (ret >= 0) {
50                 char *filename = argv[1];
51                 FILE *f = to_stdout ? stdout : fopen(filename, "wb");
52
53                 if (!f)
54                         ret = error("Could not open %s for writing", filename);
55                 else if (fwrite(result.ptr, result.size, 1, f) != 1)
56                         ret = error("Could not write to %s", filename);
57                 else if (fclose(f))
58                         ret = error("Could not close %s", filename);
59                 free(result.ptr);
60         }
61
62         return ret;
63 }