Merge branch 'sg/skip-prefix-in-prettify-refname'
[git] / builtin / merge-file.c
1 #include "builtin.h"
2 #include "cache.h"
3 #include "xdiff/xdiff.h"
4 #include "xdiff-interface.h"
5 #include "parse-options.h"
6
7 static const char *const merge_file_usage[] = {
8         N_("git merge-file [<options>] [-L <name1> [-L <orig> [-L <name2>]]] <file1> <orig-file> <file2>"),
9         NULL
10 };
11
12 static int label_cb(const struct option *opt, const char *arg, int unset)
13 {
14         static int label_count = 0;
15         const char **names = (const char **)opt->value;
16
17         if (label_count >= 3)
18                 return error("too many labels on the command line");
19         names[label_count++] = arg;
20         return 0;
21 }
22
23 int cmd_merge_file(int argc, const char **argv, const char *prefix)
24 {
25         const char *names[3] = { NULL, NULL, NULL };
26         mmfile_t mmfs[3];
27         mmbuffer_t result = {NULL, 0};
28         xmparam_t xmp = {{0}};
29         int ret = 0, i = 0, to_stdout = 0;
30         int quiet = 0;
31         struct option options[] = {
32                 OPT_BOOL('p', "stdout", &to_stdout, N_("send results to standard output")),
33                 OPT_SET_INT(0, "diff3", &xmp.style, N_("use a diff3 based merge"), XDL_MERGE_DIFF3),
34                 OPT_SET_INT(0, "ours", &xmp.favor, N_("for conflicts, use our version"),
35                             XDL_MERGE_FAVOR_OURS),
36                 OPT_SET_INT(0, "theirs", &xmp.favor, N_("for conflicts, use their version"),
37                             XDL_MERGE_FAVOR_THEIRS),
38                 OPT_SET_INT(0, "union", &xmp.favor, N_("for conflicts, use a union version"),
39                             XDL_MERGE_FAVOR_UNION),
40                 OPT_INTEGER(0, "marker-size", &xmp.marker_size,
41                             N_("for conflicts, use this marker size")),
42                 OPT__QUIET(&quiet, N_("do not warn about conflicts")),
43                 OPT_CALLBACK('L', NULL, names, N_("name"),
44                              N_("set labels for file1/orig-file/file2"), &label_cb),
45                 OPT_END(),
46         };
47
48         xmp.level = XDL_MERGE_ZEALOUS_ALNUM;
49         xmp.style = 0;
50         xmp.favor = 0;
51
52         if (startup_info->have_repository) {
53                 /* Read the configuration file */
54                 git_config(git_xmerge_config, NULL);
55                 if (0 <= git_xmerge_style)
56                         xmp.style = git_xmerge_style;
57         }
58
59         argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
60         if (argc != 3)
61                 usage_with_options(merge_file_usage, options);
62         if (quiet) {
63                 if (!freopen("/dev/null", "w", stderr))
64                         return error_errno("failed to redirect stderr to /dev/null");
65         }
66
67         for (i = 0; i < 3; i++) {
68                 char *fname;
69                 int ret;
70
71                 if (!names[i])
72                         names[i] = argv[i];
73
74                 fname = prefix_filename(prefix, argv[i]);
75                 ret = read_mmfile(mmfs + i, fname);
76                 free(fname);
77                 if (ret)
78                         return -1;
79
80                 if (mmfs[i].size > MAX_XDIFF_SIZE ||
81                     buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
82                         return error("Cannot merge binary files: %s",
83                                         argv[i]);
84         }
85
86         xmp.ancestor = names[1];
87         xmp.file1 = names[0];
88         xmp.file2 = names[2];
89         ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result);
90
91         for (i = 0; i < 3; i++)
92                 free(mmfs[i].ptr);
93
94         if (ret >= 0) {
95                 const char *filename = argv[0];
96                 char *fpath = prefix_filename(prefix, argv[0]);
97                 FILE *f = to_stdout ? stdout : fopen(fpath, "wb");
98
99                 if (!f)
100                         ret = error_errno("Could not open %s for writing",
101                                           filename);
102                 else if (result.size &&
103                          fwrite(result.ptr, result.size, 1, f) != 1)
104                         ret = error_errno("Could not write to %s", filename);
105                 else if (fclose(f))
106                         ret = error_errno("Could not close %s", filename);
107                 free(result.ptr);
108                 free(fpath);
109         }
110
111         if (ret > 127)
112                 ret = 127;
113
114         return ret;
115 }