#include "builtin.h"

#include "config.h"

#include "gettext.h"

#include "parse-options.h"

#include "repository.h"

#include "string-list.h"

#include "rerere.h"

#include "xdiff/xdiff.h"

#include "xdiff-interface.h"

#include "pathspec.h"

static const char * const rerere_usage[] = {

  N_("git rerere [clear | forget <pathspec>... | diff | status | remaining | gc]"),

  NULL,

};

static int outf(void *dummy UNUSED, mmbuffer_t *ptr, int nbuf)

{

  int i;

  for (i = 0; i < nbuf; i++)

    if (write_in_full(1, ptr[i].ptr, ptr[i].size) < 0)

      return -1;

  return 0;

}

static int diff_two(const char *file1, const char *label1,

    const char *file2, const char *label2)

{

  xpparam_t xpp;

  xdemitconf_t xecfg;

  xdemitcb_t ecb = { .out_line = outf };

  mmfile_t minus, plus;

  int ret;

  if (read_mmfile(&minus, file1) || read_mmfile(&plus, file2))

    return -1;

  printf("--- a/%s\n+++ b/%s\n", label1, label2);

  fflush(stdout);

  memset(&xpp, 0, sizeof(xpp));

  xpp.flags = 0;

  memset(&xecfg, 0, sizeof(xecfg));

  xecfg.ctxlen = 3;

  ret = xdi_diff(&minus, &plus, &xpp, &xecfg, &ecb);

  free(minus.ptr);

  free(plus.ptr);

  return ret;

}

int cmd_rerere(int argc, const char **argv, const char *prefix)

{

  struct string_list merge_rr = STRING_LIST_INIT_DUP;

  int i, autoupdate = -1, flags = 0;

  struct option options[] = {

    OPT_SET_INT(0, "rerere-autoupdate", &autoupdate,

      N_("register clean resolutions in index"), 1),

    OPT_END(),

  };

  argc = parse_options(argc, argv, prefix, options, rerere_usage, 0);

  git_config(git_xmerge_config, NULL);

  if (autoupdate == 1)

    flags = RERERE_AUTOUPDATE;

  if (autoupdate == 0)

    flags = RERERE_NOAUTOUPDATE;

  if (argc < 1)

    return repo_rerere(the_repository, flags);

  if (!strcmp(argv[0], "forget")) {

    struct pathspec pathspec;

    int ret;

    if (argc < 2)

      warning(_("'git rerere forget' without paths is deprecated"));

    parse_pathspec(&pathspec, 0, PATHSPEC_PREFER_CWD,

             prefix, argv + 1);

    ret = rerere_forget(the_repository, &pathspec);

    clear_pathspec(&pathspec);

    return ret;

  }

  if (!strcmp(argv[0], "clear")) {

    rerere_clear(the_repository, &merge_rr);

  } else if (!strcmp(argv[0], "gc"))

    rerere_gc(the_repository, &merge_rr);

  else if (!strcmp(argv[0], "status")) {

    if (setup_rerere(the_repository, &merge_rr,

         flags | RERERE_READONLY) < 0)

      return 0;

    for (i = 0; i < merge_rr.nr; i++)

      printf("%s\n", merge_rr.items[i].string);

  } else if (!strcmp(argv[0], "remaining")) {

    rerere_remaining(the_repository, &merge_rr);

    for (i = 0; i < merge_rr.nr; i++) {

      if (merge_rr.items[i].util != RERERE_RESOLVED)

        printf("%s\n", merge_rr.items[i].string);

      else

        /* prepare for later call to

         * string_list_clear() */

        merge_rr.items[i].util = NULL;

    }

  } else if (!strcmp(argv[0], "diff")) {

    if (setup_rerere(the_repository, &merge_rr,

         flags | RERERE_READONLY) < 0)

      return 0;

    for (i = 0; i < merge_rr.nr; i++) {

      const char *path = merge_rr.items[i].string;

      const struct rerere_id *id = merge_rr.items[i].util;

      if (diff_two(rerere_path(id, "preimage"), path, path, path))

        die(_("unable to generate diff for '%s'"), rerere_path(id, NULL));

    }

  } else

    usage_with_options(rerere_usage, options);

  string_list_clear(&merge_rr, 1);

  return 0;

}