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         int prefixlen = 0;
  32         struct option options[] = {
  33                 OPT_BOOL('p', "stdout", &to_stdout, N_("send results to standard output")),
  34                 OPT_SET_INT(0, "diff3", &xmp.style, N_("use a diff3 based merge"), XDL_MERGE_DIFF3),
  35                 OPT_SET_INT(0, "ours", &xmp.favor, N_("for conflicts, use our version"),
  36                             XDL_MERGE_FAVOR_OURS),
  37                 OPT_SET_INT(0, "theirs", &xmp.favor, N_("for conflicts, use their version"),
  38                             XDL_MERGE_FAVOR_THEIRS),
  39                 OPT_SET_INT(0, "union", &xmp.favor, N_("for conflicts, use a union version"),
  40                             XDL_MERGE_FAVOR_UNION),
  41                 OPT_INTEGER(0, "marker-size", &xmp.marker_size,
  42                             N_("for conflicts, use this marker size")),
  43                 OPT__QUIET(&quiet, N_("do not warn about conflicts")),
  44                 OPT_CALLBACK('L', NULL, names, N_("name"),
  45                              N_("set labels for file1/orig-file/file2"), &label_cb),
  46                 OPT_END(),
  47         };
  48
  49         xmp.level = XDL_MERGE_ZEALOUS_ALNUM;
  50         xmp.style = 0;
  51         xmp.favor = 0;
  52
  53         if (startup_info->have_repository) {
  54                 /* Read the configuration file */
  55                 git_config(git_xmerge_config, NULL);
  56                 if (0 <= git_xmerge_style)
  57                         xmp.style = git_xmerge_style;
  58         }
  59
  60         argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
  61         if (argc != 3)
  62                 usage_with_options(merge_file_usage, options);
  63         if (quiet) {
  64                 if (!freopen("/dev/null", "w", stderr))
  65                         return error_errno("failed to redirect stderr to /dev/null");
  66         }
  67
  68         if (prefix)
  69                 prefixlen = strlen(prefix);
  70
  71         for (i = 0; i < 3; i++) {
  72                 const char *fname = prefix_filename(prefix, prefixlen, argv[i]);
  73                 if (!names[i])
  74                         names[i] = argv[i];
  75                 if (read_mmfile(mmfs + i, fname))
  76                         return -1;
  77                 if (mmfs[i].size > MAX_XDIFF_SIZE ||
  78                     buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
  79                         return error("Cannot merge binary files: %s",
  80                                         argv[i]);
  81         }
  82
  83         xmp.ancestor = names[1];
  84         xmp.file1 = names[0];
  85         xmp.file2 = names[2];
  86         ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result);
  87
  88         for (i = 0; i < 3; i++)
  89                 free(mmfs[i].ptr);
  90
  91         if (ret >= 0) {
  92                 const char *filename = argv[0];
  93                 const char *fpath = prefix_filename(prefix, prefixlen, argv[0]);
  94                 FILE *f = to_stdout ? stdout : fopen(fpath, "wb");
  95
  96                 if (!f)
  97                         ret = error_errno("Could not open %s for writing",
  98                                           filename);
  99                 else if (result.size &&
 100                          fwrite(result.ptr, result.size, 1, f) != 1)
 101                         ret = error_errno("Could not write to %s", filename);
 102                 else if (fclose(f))
 103                         ret = error_errno("Could not close %s", filename);
 104                 free(result.ptr);
 105         }
 106
 107         if (ret > 127)
 108                 ret = 127;
 109
 110         return ret;
 111 }