Andrew's git - gitweb.git/blob - 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
   7static 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
  12static 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
  23int 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 quiet = 0;
  31        int nongit;
  32        struct option options[] = {
  33                OPT_BOOLEAN('p', "stdout", &to_stdout, "send results to standard output"),
  34                OPT_SET_INT(0, "diff3", &xmp.style, "use a diff3 based merge", XDL_MERGE_DIFF3),
  35                OPT_SET_INT(0, "ours", &xmp.favor, "for conflicts, use our version",
  36                            XDL_MERGE_FAVOR_OURS),
  37                OPT_SET_INT(0, "theirs", &xmp.favor, "for conflicts, use their version",
  38                            XDL_MERGE_FAVOR_THEIRS),
  39                OPT_SET_INT(0, "union", &xmp.favor, "for conflicts, use a union version",
  40                            XDL_MERGE_FAVOR_UNION),
  41                OPT_INTEGER(0, "marker-size", &xmp.marker_size,
  42                            "for conflicts, use this marker size"),
  43                OPT__QUIET(&quiet),
  44                OPT_CALLBACK('L', NULL, names, "name",
  45                             "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        prefix = setup_git_directory_gently(&nongit);
  54        if (!nongit) {
  55                /* Read the configuration file */
  56                git_config(git_xmerge_config, NULL);
  57                if (0 <= git_xmerge_style)
  58                        xmp.style = git_xmerge_style;
  59        }
  60
  61        argc = parse_options(argc, argv, prefix, options, merge_file_usage, 0);
  62        if (argc != 3)
  63                usage_with_options(merge_file_usage, options);
  64        if (quiet) {
  65                if (!freopen("/dev/null", "w", stderr))
  66                        return error("failed to redirect stderr to /dev/null: "
  67                                     "%s\n", strerror(errno));
  68        }
  69
  70        for (i = 0; i < 3; i++) {
  71                if (!names[i])
  72                        names[i] = argv[i];
  73                if (read_mmfile(mmfs + i, argv[i]))
  74                        return -1;
  75                if (buffer_is_binary(mmfs[i].ptr, mmfs[i].size))
  76                        return error("Cannot merge binary files: %s\n",
  77                                        argv[i]);
  78        }
  79
  80        xmp.ancestor = names[1];
  81        xmp.file1 = names[0];
  82        xmp.file2 = names[2];
  83        ret = xdl_merge(mmfs + 1, mmfs + 0, mmfs + 2, &xmp, &result);
  84
  85        for (i = 0; i < 3; i++)
  86                free(mmfs[i].ptr);
  87
  88        if (ret >= 0) {
  89                const char *filename = argv[0];
  90                FILE *f = to_stdout ? stdout : fopen(filename, "wb");
  91
  92                if (!f)
  93                        ret = error("Could not open %s for writing", filename);
  94                else if (result.size &&
  95                         fwrite(result.ptr, result.size, 1, f) != 1)
  96                        ret = error("Could not write to %s", filename);
  97                else if (fclose(f))
  98                        ret = error("Could not close %s", filename);
  99                free(result.ptr);
 100        }
 101
 102        return ret;
 103}