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         "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 = {{XDF_NEED_MINIMAL}};
  29         int ret = 0, i = 0, to_stdout = 0;
  30         int level = XDL_MERGE_ZEALOUS_ALNUM;
  31         int style = 0, quiet = 0;
  32         int favor = 0;
  33         int nongit;
  34
  35         struct option options[] = {
  36                 OPT_BOOLEAN('p', "stdout", &to_stdout, "send results to standard output"),
  37                 OPT_SET_INT(0, "diff3", &style, "use a diff3 based merge", XDL_MERGE_DIFF3),
  38                 OPT_SET_INT(0, "ours", &favor, "for conflicts, use our version",
  39                             XDL_MERGE_FAVOR_OURS),
  40                 OPT_SET_INT(0, "theirs", &favor, "for conflicts, use their version",
  41                             XDL_MERGE_FAVOR_THEIRS),
  42                 OPT__QUIET(&quiet),
  43                 OPT_CALLBACK('L', NULL, names, "name",
  44                              "set labels for file1/orig_file/file2", &label_cb),
  45                 OPT_END(),
  46         };
  47
  48         prefix = setup_git_directory_gently(&nongit);
  49         if (!nongit) {
  50                 /* Read the configuration file */
  51                 git_config(git_xmerge_config, NULL);
  52                 if (0 <= git_xmerge_style)
  53                         style = git_xmerge_style;
  54         }
  55
  56         argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
  57         if (argc != 3)
  58                 usage_with_options(merge_file_usage, options);
  59         if (quiet) {
  60                 if (!freopen("/dev/null", "w", stderr))
  61                         return error("failed to redirect stderr to /dev/null: "
  62                                      "%s\n", strerror(errno));
  63         }
  64
  65         for (i = 0; i < 3; i++) {
  66                 if (!names[i])
  67                         names[i] = argv[i];
  68                 if (read_mmfile(mmfs + i, argv[i]))
  69                         return -1;
  70                 if (buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
  71                         return error("Cannot merge binary files: %s\n",
  72                                         argv[i]);
  73         }
  74
  75         ret = xdl_merge(mmfs + 1, mmfs + 0, names[0], mmfs + 2, names[2],
  76                         &xmp, XDL_MERGE_FLAGS(level, style, favor), &result);
  77
  78         for (i = 0; i < 3; i++)
  79                 free(mmfs[i].ptr);
  80
  81         if (ret >= 0) {
  82                 const char *filename = argv[0];
  83                 FILE *f = to_stdout ? stdout : fopen(filename, "wb");
  84
  85                 if (!f)
  86                         ret = error("Could not open %s for writing", filename);
  87                 else if (result.size &&
  88                          fwrite(result.ptr, result.size, 1, f) != 1)
  89                         ret = error("Could not write to %s", filename);
  90                 else if (fclose(f))
  91                         ret = error("Could not close %s", filename);
  92                 free(result.ptr);
  93         }
  94
  95         return ret;
  96 }