builtin/merge-file.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "config.h"
   4 #include "xdiff/xdiff.h"
   5 #include "xdiff-interface.h"
   6 #include "parse-options.h"
   7
   8 static const char *const merge_file_usage[] = {
   9         N_("git merge-file [<options>] [-L <name1> [-L <orig> [-L <name2>]]] <file1> <orig-file> <file2>"),
  10         NULL
  11 };
  12
  13 static int label_cb(const struct option *opt, const char *arg, int unset)
  14 {
  15         static int label_count = 0;
  16         const char **names = (const char **)opt->value;
  17
  18         BUG_ON_OPT_NEG(unset);
  19
  20         if (label_count >= 3)
  21                 return error("too many labels on the command line");
  22         names[label_count++] = arg;
  23         return 0;
  24 }
  25
  26 int cmd_merge_file(int argc, const char **argv, const char *prefix)
  27 {
  28         const char *names[3] = { NULL, NULL, NULL };
  29         mmfile_t mmfs[3];
  30         mmbuffer_t result = {NULL, 0};
  31         xmparam_t xmp = {{0}};
  32         int ret = 0, i = 0, to_stdout = 0;
  33         int quiet = 0;
  34         struct option options[] = {
  35                 OPT_BOOL('p', "stdout", &to_stdout, N_("send results to standard output")),
  36                 OPT_SET_INT(0, "diff3", &xmp.style, N_("use a diff3 based merge"), XDL_MERGE_DIFF3),
  37                 OPT_SET_INT(0, "ours", &xmp.favor, N_("for conflicts, use our version"),
  38                             XDL_MERGE_FAVOR_OURS),
  39                 OPT_SET_INT(0, "theirs", &xmp.favor, N_("for conflicts, use their version"),
  40                             XDL_MERGE_FAVOR_THEIRS),
  41                 OPT_SET_INT(0, "union", &xmp.favor, N_("for conflicts, use a union version"),
  42                             XDL_MERGE_FAVOR_UNION),
  43                 OPT_INTEGER(0, "marker-size", &xmp.marker_size,
  44                             N_("for conflicts, use this marker size")),
  45                 OPT__QUIET(&quiet, N_("do not warn about conflicts")),
  46                 OPT_CALLBACK('L', NULL, names, N_("name"),
  47                              N_("set labels for file1/orig-file/file2"), &label_cb),
  48                 OPT_END(),
  49         };
  50
  51         xmp.level = XDL_MERGE_ZEALOUS_ALNUM;
  52         xmp.style = 0;
  53         xmp.favor = 0;
  54
  55         if (startup_info->have_repository) {
  56                 /* Read the configuration file */
  57                 git_config(git_xmerge_config, NULL);
  58                 if (0 <= git_xmerge_style)
  59                         xmp.style = git_xmerge_style;
  60         }
  61
  62         argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
  63         if (argc != 3)
  64                 usage_with_options(merge_file_usage, options);
  65         if (quiet) {
  66                 if (!freopen("/dev/null", "w", stderr))
  67                         return error_errno("failed to redirect stderr to /dev/null");
  68         }
  69
  70         for (i = 0; i < 3; i++) {
  71                 char *fname;
  72                 int ret;
  73
  74                 if (!names[i])
  75                         names[i] = argv[i];
  76
  77                 fname = prefix_filename(prefix, argv[i]);
  78                 ret = read_mmfile(mmfs + i, fname);
  79                 free(fname);
  80                 if (ret)
  81                         return -1;
  82
  83                 if (mmfs[i].size > MAX_XDIFF_SIZE ||
  84                     buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
  85                         return error("Cannot merge binary files: %s",
  86                                         argv[i]);
  87         }
  88
  89         xmp.ancestor = names[1];
  90         xmp.file1 = names[0];
  91         xmp.file2 = names[2];
  92         ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result);
  93
  94         for (i = 0; i < 3; i++)
  95                 free(mmfs[i].ptr);
  96
  97         if (ret >= 0) {
  98                 const char *filename = argv[0];
  99                 char *fpath = prefix_filename(prefix, argv[0]);
 100                 FILE *f = to_stdout ? stdout : fopen(fpath, "wb");
 101
 102                 if (!f)
 103                         ret = error_errno("Could not open %s for writing",
 104                                           filename);
 105                 else if (result.size &&
 106                          fwrite(result.ptr, result.size, 1, f) != 1)
 107                         ret = error_errno("Could not write to %s", filename);
 108                 else if (fclose(f))
 109                         ret = error_errno("Could not close %s", filename);
 110                 free(result.ptr);
 111                 free(fpath);
 112         }
 113
 114         if (ret > 127)
 115                 ret = 127;
 116
 117         return ret;
 118 }