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 }