/src/git/builtin/log.c

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/*
 * Builtin "git log" and related commands (show, whatchanged)
 *
 * (C) Copyright 2006 Linus Torvalds
 *     2006 Junio Hamano
 */
#include "builtin.h"
#include "abspath.h"
#include "config.h"
#include "environment.h"
#include "gettext.h"
#include "hex.h"
#include "refs.h"
#include "object-file.h"
#include "object-name.h"
#include "object-store-ll.h"
#include "pager.h"
#include "color.h"
#include "commit.h"
#include "diff.h"
#include "diff-merges.h"
#include "revision.h"
#include "log-tree.h"
#include "builtin.h"
#include "oid-array.h"
#include "tag.h"
#include "reflog-walk.h"
#include "patch-ids.h"
#include "shortlog.h"
#include "remote.h"
#include "string-list.h"
#include "parse-options.h"
#include "line-log.h"
#include "branch.h"
#include "streaming.h"
#include "version.h"
#include "mailmap.h"
#include "progress.h"
#include "commit-slab.h"
#include "repository.h"
#include "commit-reach.h"
#include "range-diff.h"
#include "tmp-objdir.h"
#include "tree.h"
#include "write-or-die.h"

#define MAIL_DEFAULT_WRAP 72
#define COVER_FROM_AUTO_MAX_SUBJECT_LEN 100
#define FORMAT_PATCH_NAME_MAX_DEFAULT 64

static unsigned int force_in_body_from;
static int stdout_mboxrd;
static int format_no_prefix;

static const char * const builtin_log_usage[] = {
  N_("git log [<options>] [<revision-range>] [[--] <path>...]"),
  N_("git show [<options>] <object>..."),
  NULL
};

struct line_opt_callback_data {
  struct rev_info *rev;
  const char *prefix;
  struct string_list args;
};

static int session_is_interactive(void)
{
  return isatty(1) || pager_in_use();
}

static int auto_decoration_style(void)
{
  return session_is_interactive() ? DECORATE_SHORT_REFS : 0;
}

static int parse_decoration_style(const char *value)
{
  switch (git_parse_maybe_bool(value)) {
  case 1:
    return DECORATE_SHORT_REFS;
  case 0:
    return 0;
  default:
    break;
  }
  if (!strcmp(value, "full"))
    return DECORATE_FULL_REFS;
  else if (!strcmp(value, "short"))
    return DECORATE_SHORT_REFS;
  else if (!strcmp(value, "auto"))
    return auto_decoration_style();
  /*
   * Please update _git_log() in git-completion.bash when you
   * add new decoration styles.
   */
  return -1;
}

struct log_config {
  int default_abbrev_commit;
  int default_show_root;
  int default_follow;
  int default_show_signature;
  int default_encode_email_headers;
  int decoration_style;
  int decoration_given;
  int use_mailmap_config;
  char *fmt_patch_subject_prefix;
  int fmt_patch_name_max;
  char *fmt_pretty;
  char *default_date_mode;
};

static void log_config_init(struct log_config *cfg)
{
  memset(cfg, 0, sizeof(*cfg));
  cfg->default_show_root = 1;
  cfg->default_encode_email_headers = 1;
  cfg->use_mailmap_config = 1;
  cfg->fmt_patch_subject_prefix = xstrdup("PATCH");
  cfg->fmt_patch_name_max = FORMAT_PATCH_NAME_MAX_DEFAULT;
  cfg->decoration_style = auto_decoration_style();
}

static void log_config_release(struct log_config *cfg)
{
  free(cfg->default_date_mode);
  free(cfg->fmt_pretty);
  free(cfg->fmt_patch_subject_prefix);
}

static int use_default_decoration_filter = 1;
static struct string_list decorate_refs_exclude = STRING_LIST_INIT_NODUP;
static struct string_list decorate_refs_exclude_config = STRING_LIST_INIT_NODUP;
static struct string_list decorate_refs_include = STRING_LIST_INIT_NODUP;

static int clear_decorations_callback(const struct option *opt UNUSED,
              const char *arg, int unset)
{
  BUG_ON_OPT_NEG(unset);
  BUG_ON_OPT_ARG(arg);
  string_list_clear(&decorate_refs_include, 0);
  string_list_clear(&decorate_refs_exclude, 0);
  use_default_decoration_filter = 0;
  return 0;
}

static int decorate_callback(const struct option *opt, const char *arg,
           int unset)
{
  struct log_config *cfg = opt->value;

  if (unset)
    cfg->decoration_style = 0;
  else if (arg)
    cfg->decoration_style = parse_decoration_style(arg);
  else
    cfg->decoration_style = DECORATE_SHORT_REFS;

  if (cfg->decoration_style < 0)
    die(_("invalid --decorate option: %s"), arg);

  cfg->decoration_given = 1;

  return 0;
}

static int log_line_range_callback(const struct option *option, const char *arg, int unset)
{
  struct line_opt_callback_data *data = option->value;

  BUG_ON_OPT_NEG(unset);

  if (!arg)
    return -1;

  data->rev->line_level_traverse = 1;
  string_list_append(&data->args, arg);

  return 0;
}

static void cmd_log_init_defaults(struct rev_info *rev,
          struct log_config *cfg)
{
  if (cfg->fmt_pretty)
    get_commit_format(cfg->fmt_pretty, rev);
  if (cfg->default_follow)
    rev->diffopt.flags.default_follow_renames = 1;
  rev->verbose_header = 1;
  init_diffstat_widths(&rev->diffopt);
  rev->diffopt.flags.recursive = 1;
  rev->diffopt.flags.allow_textconv = 1;
  rev->abbrev_commit = cfg->default_abbrev_commit;
  rev->show_root_diff = cfg->default_show_root;
  rev->subject_prefix = cfg->fmt_patch_subject_prefix;
  rev->patch_name_max = cfg->fmt_patch_name_max;
  rev->show_signature = cfg->default_show_signature;
  rev->encode_email_headers = cfg->default_encode_email_headers;

  if (cfg->default_date_mode)
    parse_date_format(cfg->default_date_mode, &rev->date_mode);
}

static void set_default_decoration_filter(struct decoration_filter *decoration_filter)
{
  int i;
  char *value = NULL;
  struct string_list *include = decoration_filter->include_ref_pattern;
  const struct string_list *config_exclude;

  if (!git_config_get_string_multi("log.excludeDecoration",
           &config_exclude)) {
    struct string_list_item *item;
    for_each_string_list_item(item, config_exclude)
      string_list_append(decoration_filter->exclude_ref_config_pattern,
             item->string);
  }

  /*
   * By default, decorate_all is disabled. Enable it if
   * log.initialDecorationSet=all. Don't ever disable it by config,
   * since the command-line takes precedent.
   */
  if (use_default_decoration_filter &&
      !git_config_get_string("log.initialdecorationset", &value) &&
      !strcmp("all", value))
    use_default_decoration_filter = 0;
  free(value);

  if (!use_default_decoration_filter ||
      decoration_filter->exclude_ref_pattern->nr ||
      decoration_filter->include_ref_pattern->nr ||
      decoration_filter->exclude_ref_config_pattern->nr)
    return;

  /*
   * No command-line or config options were given, so
   * populate with sensible defaults.
   */
  for (i = 0; i < ARRAY_SIZE(ref_namespace); i++) {
    if (!ref_namespace[i].decoration)
      continue;

    string_list_append(include, ref_namespace[i].ref);
  }
}

static void cmd_log_init_finish(int argc, const char **argv, const char *prefix,
       struct rev_info *rev, struct setup_revision_opt *opt,
       struct log_config *cfg)
{
  struct userformat_want w;
  int quiet = 0, source = 0, mailmap;
  static struct line_opt_callback_data line_cb = {NULL, NULL, STRING_LIST_INIT_DUP};
  struct decoration_filter decoration_filter = {
    .exclude_ref_pattern = &decorate_refs_exclude,
    .include_ref_pattern = &decorate_refs_include,
    .exclude_ref_config_pattern = &decorate_refs_exclude_config,
  };
  static struct revision_sources revision_sources;

  const struct option builtin_log_options[] = {
    OPT__QUIET(&quiet, N_("suppress diff output")),
    OPT_BOOL(0, "source", &source, N_("show source")),
    OPT_BOOL(0, "use-mailmap", &mailmap, N_("use mail map file")),
    OPT_ALIAS(0, "mailmap", "use-mailmap"),
    OPT_CALLBACK_F(0, "clear-decorations", NULL, NULL,
             N_("clear all previously-defined decoration filters"),
             PARSE_OPT_NOARG | PARSE_OPT_NONEG,
             clear_decorations_callback),
    OPT_STRING_LIST(0, "decorate-refs", &decorate_refs_include,
        N_("pattern"), N_("only decorate refs that match <pattern>")),
    OPT_STRING_LIST(0, "decorate-refs-exclude", &decorate_refs_exclude,
        N_("pattern"), N_("do not decorate refs that match <pattern>")),
    OPT_CALLBACK_F(0, "decorate", cfg, NULL, N_("decorate options"),
             PARSE_OPT_OPTARG, decorate_callback),
    OPT_CALLBACK('L', NULL, &line_cb, "range:file",
           N_("trace the evolution of line range <start>,<end> or function :<funcname> in <file>"),
           log_line_range_callback),
    OPT_END()
  };

  line_cb.rev = rev;
  line_cb.prefix = prefix;

  mailmap = cfg->use_mailmap_config;
  argc = parse_options(argc, argv, prefix,
           builtin_log_options, builtin_log_usage,
           PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT |
           PARSE_OPT_KEEP_DASHDASH);

  if (quiet)
    rev->diffopt.output_format |= DIFF_FORMAT_NO_OUTPUT;
  argc = setup_revisions(argc, argv, rev, opt);

  /* Any arguments at this point are not recognized */
  if (argc > 1)
    die(_("unrecognized argument: %s"), argv[1]);

  if (rev->line_level_traverse && rev->prune_data.nr)
    die(_("-L<range>:<file> cannot be used with pathspec"));

  memset(&w, 0, sizeof(w));
  userformat_find_requirements(NULL, &w);

  if (!rev->show_notes_given && (!rev->pretty_given || w.notes))
    rev->show_notes = 1;
  if (rev->show_notes)
    load_display_notes(&rev->notes_opt);

  if ((rev->diffopt.pickaxe_opts & DIFF_PICKAXE_KINDS_MASK) ||
      rev->diffopt.filter || rev->diffopt.flags.follow_renames)
    rev->always_show_header = 0;

  if (source || w.source) {
    init_revision_sources(&revision_sources);
    rev->sources = &revision_sources;
  }

  if (mailmap) {
    rev->mailmap = xmalloc(sizeof(struct string_list));
    string_list_init_nodup(rev->mailmap);
    read_mailmap(rev->mailmap);
  }

  if (rev->pretty_given && rev->commit_format == CMIT_FMT_RAW) {
    /*
     * "log --pretty=raw" is special; ignore UI oriented
     * configuration variables such as decoration.
     */
    if (!cfg->decoration_given)
      cfg->decoration_style = 0;
    if (!rev->abbrev_commit_given)
      rev->abbrev_commit = 0;
  }

  if (rev->commit_format == CMIT_FMT_USERFORMAT) {
    if (!w.decorate) {
      /*
       * Disable decoration loading if the format will not
       * show them anyway.
       */
      cfg->decoration_style = 0;
    } else if (!cfg->decoration_style) {
      /*
       * If we are going to show them, make sure we do load
       * them here, but taking care not to override a
       * specific style set by config or --decorate.
       */
      cfg->decoration_style = DECORATE_SHORT_REFS;
    }
  }

  if (cfg->decoration_style || rev->simplify_by_decoration) {
    set_default_decoration_filter(&decoration_filter);

    if (cfg->decoration_style)
      rev->show_decorations = 1;

    load_ref_decorations(&decoration_filter, cfg->decoration_style);
  }

  if (rev->line_level_traverse)
    line_log_init(rev, line_cb.prefix, &line_cb.args);

  setup_pager();
}

static void cmd_log_init(int argc, const char **argv, const char *prefix,
       struct rev_info *rev, struct setup_revision_opt *opt,
       struct log_config *cfg)
{
  cmd_log_init_defaults(rev, cfg);
  cmd_log_init_finish(argc, argv, prefix, rev, opt, cfg);
}

/*
 * This gives a rough estimate for how many commits we
 * will print out in the list.
 */
static int estimate_commit_count(struct commit_list *list)
{
  int n = 0;

  while (list) {
    struct commit *commit = list->item;
    unsigned int flags = commit->object.flags;
    list = list->next;
    if (!(flags & (TREESAME | UNINTERESTING)))
      n++;
  }
  return n;
}

static void show_early_header(struct rev_info *rev, const char *stage, int nr)
{
  if (rev->shown_one) {
    rev->shown_one = 0;
    if (rev->commit_format != CMIT_FMT_ONELINE)
      putchar(rev->diffopt.line_termination);
  }
  fprintf(rev->diffopt.file, _("Final output: %d %s\n"), nr, stage);
}

static struct itimerval early_output_timer;

static void log_show_early(struct rev_info *revs, struct commit_list *list)
{
  int i = revs->early_output;
  int show_header = 1;
  int no_free = revs->diffopt.no_free;

  revs->diffopt.no_free = 0;
  sort_in_topological_order(&list, revs->sort_order);
  while (list && i) {
    struct commit *commit = list->item;
    switch (simplify_commit(revs, commit)) {
    case commit_show:
      if (show_header) {
        int n = estimate_commit_count(list);
        show_early_header(revs, "incomplete", n);
        show_header = 0;
      }
      log_tree_commit(revs, commit);
      i--;
      break;
    case commit_ignore:
      break;
    case commit_error:
      revs->diffopt.no_free = no_free;
      diff_free(&revs->diffopt);
      return;
    }
    list = list->next;
  }

  /* Did we already get enough commits for the early output? */
  if (!i) {
    revs->diffopt.no_free = 0;
    diff_free(&revs->diffopt);
    return;
  }

  /*
   * ..if no, then repeat it twice a second until we
   * do.
   *
   * NOTE! We don't use "it_interval", because if the
   * reader isn't listening, we want our output to be
   * throttled by the writing, and not have the timer
   * trigger every second even if we're blocked on a
   * reader!
   */
  early_output_timer.it_value.tv_sec = 0;
  early_output_timer.it_value.tv_usec = 500000;
  setitimer(ITIMER_REAL, &early_output_timer, NULL);
}

static void early_output(int signal UNUSED)
{
  show_early_output = log_show_early;
}

static void setup_early_output(void)
{
  struct sigaction sa;

  /*
   * Set up the signal handler, minimally intrusively:
   * we only set a single volatile integer word (not
   * using sigatomic_t - trying to avoid unnecessary
   * system dependencies and headers), and using
   * SA_RESTART.
   */
  memset(&sa, 0, sizeof(sa));
  sa.sa_handler = early_output;
  sigemptyset(&sa.sa_mask);
  sa.sa_flags = SA_RESTART;
  sigaction(SIGALRM, &sa, NULL);

  /*
   * If we can get the whole output in less than a
   * tenth of a second, don't even bother doing the
   * early-output thing..
   *
   * This is a one-time-only trigger.
   */
  early_output_timer.it_value.tv_sec = 0;
  early_output_timer.it_value.tv_usec = 100000;
  setitimer(ITIMER_REAL, &early_output_timer, NULL);
}

static void finish_early_output(struct rev_info *rev)
{
  int n = estimate_commit_count(rev->commits);
  signal(SIGALRM, SIG_IGN);
  show_early_header(rev, "done", n);
}

static int cmd_log_walk_no_free(struct rev_info *rev)
{
  struct commit *commit;
  int saved_nrl = 0;
  int saved_dcctc = 0;
  int result;

  if (rev->early_output)
    setup_early_output();

  if (prepare_revision_walk(rev))
    die(_("revision walk setup failed"));

  if (rev->early_output)
    finish_early_output(rev);

  /*
   * For --check and --exit-code, the exit code is based on CHECK_FAILED
   * and HAS_CHANGES being accumulated in rev->diffopt, so be careful to
   * retain that state information if replacing rev->diffopt in this loop
   */
  while ((commit = get_revision(rev)) != NULL) {
    if (!log_tree_commit(rev, commit) && rev->max_count >= 0)
      /*
       * We decremented max_count in get_revision,
       * but we didn't actually show the commit.
       */
      rev->max_count++;
    if (!rev->reflog_info) {
      /*
       * We may show a given commit multiple times when
       * walking the reflogs.
       */
      free_commit_buffer(the_repository->parsed_objects,
             commit);
      free_commit_list(commit->parents);
      commit->parents = NULL;
    }
    if (saved_nrl < rev->diffopt.needed_rename_limit)
      saved_nrl = rev->diffopt.needed_rename_limit;
    if (rev->diffopt.degraded_cc_to_c)
      saved_dcctc = 1;
  }
  rev->diffopt.degraded_cc_to_c = saved_dcctc;
  rev->diffopt.needed_rename_limit = saved_nrl;

  result = diff_result_code(rev);
  if (rev->diffopt.output_format & DIFF_FORMAT_CHECKDIFF &&
      rev->diffopt.flags.check_failed) {
    result = 02;
  }
  return result;
}

static int cmd_log_walk(struct rev_info *rev)
{
  int retval;

  rev->diffopt.no_free = 1;
  retval = cmd_log_walk_no_free(rev);
  rev->diffopt.no_free = 0;
  diff_free(&rev->diffopt);
  return retval;
}

static int git_log_config(const char *var, const char *value,
        const struct config_context *ctx, void *cb)
{
  struct log_config *cfg = cb;
  const char *slot_name;

  if (!strcmp(var, "format.pretty")) {
    FREE_AND_NULL(cfg->fmt_pretty);
    return git_config_string(&cfg->fmt_pretty, var, value);
  }
  if (!strcmp(var, "format.subjectprefix")) {
    FREE_AND_NULL(cfg->fmt_patch_subject_prefix);
    return git_config_string(&cfg->fmt_patch_subject_prefix, var, value);
  }
  if (!strcmp(var, "format.filenamemaxlength")) {
    cfg->fmt_patch_name_max = git_config_int(var, value, ctx->kvi);
    return 0;
  }
  if (!strcmp(var, "format.encodeemailheaders")) {
    cfg->default_encode_email_headers = git_config_bool(var, value);
    return 0;
  }
  if (!strcmp(var, "log.abbrevcommit")) {
    cfg->default_abbrev_commit = git_config_bool(var, value);
    return 0;
  }
  if (!strcmp(var, "log.date")) {
    FREE_AND_NULL(cfg->default_date_mode);
    return git_config_string(&cfg->default_date_mode, var, value);
  }
  if (!strcmp(var, "log.decorate")) {
    cfg->decoration_style = parse_decoration_style(value);
    if (cfg->decoration_style < 0)
      cfg->decoration_style = 0; /* maybe warn? */
    return 0;
  }
  if (!strcmp(var, "log.diffmerges")) {
    if (!value)
      return config_error_nonbool(var);
    return diff_merges_config(value);
  }
  if (!strcmp(var, "log.showroot")) {
    cfg->default_show_root = git_config_bool(var, value);
    return 0;
  }
  if (!strcmp(var, "log.follow")) {
    cfg->default_follow = git_config_bool(var, value);
    return 0;
  }
  if (skip_prefix(var, "color.decorate.", &slot_name))
    return parse_decorate_color_config(var, slot_name, value);
  if (!strcmp(var, "log.mailmap")) {
    cfg->use_mailmap_config = git_config_bool(var, value);
    return 0;
  }
  if (!strcmp(var, "log.showsignature")) {
    cfg->default_show_signature = git_config_bool(var, value);
    return 0;
  }

  return git_diff_ui_config(var, value, ctx, cb);
}

int cmd_whatchanged(int argc, const char **argv, const char *prefix)
{
  struct log_config cfg;
  struct rev_info rev;
  struct setup_revision_opt opt;
  int ret;

  log_config_init(&cfg);
  init_diff_ui_defaults();
  git_config(git_log_config, &cfg);

  repo_init_revisions(the_repository, &rev, prefix);
  git_config(grep_config, &rev.grep_filter);

  rev.diff = 1;
  rev.simplify_history = 0;
  memset(&opt, 0, sizeof(opt));
  opt.def = "HEAD";
  opt.revarg_opt = REVARG_COMMITTISH;
  cmd_log_init(argc, argv, prefix, &rev, &opt, &cfg);
  if (!rev.diffopt.output_format)
    rev.diffopt.output_format = DIFF_FORMAT_RAW;

  ret = cmd_log_walk(&rev);

  release_revisions(&rev);
  log_config_release(&cfg);
  return ret;
}

static void show_tagger(const char *buf, struct rev_info *rev)
{
  struct strbuf out = STRBUF_INIT;
  struct pretty_print_context pp = {0};

  pp.fmt = rev->commit_format;
  pp.date_mode = rev->date_mode;
  pp_user_info(&pp, "Tagger", &out, buf, get_log_output_encoding());
  fprintf(rev->diffopt.file, "%s", out.buf);
  strbuf_release(&out);
}

static int show_blob_object(const struct object_id *oid, struct rev_info *rev, const char *obj_name)
{
  struct object_id oidc;
  struct object_context obj_context = {0};
  char *buf;
  unsigned long size;

  fflush(rev->diffopt.file);
  if (!rev->diffopt.flags.textconv_set_via_cmdline ||
      !rev->diffopt.flags.allow_textconv)
    return stream_blob_to_fd(1, oid, NULL, 0);

  if (get_oid_with_context(the_repository, obj_name,
         GET_OID_RECORD_PATH,
         &oidc, &obj_context))
    die(_("not a valid object name %s"), obj_name);
  if (!obj_context.path ||
      !textconv_object(the_repository, obj_context.path,
           obj_context.mode, &oidc, 1, &buf, &size)) {
    object_context_release(&obj_context);
    return stream_blob_to_fd(1, oid, NULL, 0);
  }

  if (!buf)
    die(_("git show %s: bad file"), obj_name);

  write_or_die(1, buf, size);
  object_context_release(&obj_context);
  free(buf);
  return 0;
}

static int show_tag_object(const struct object_id *oid, struct rev_info *rev)
{
  unsigned long size;
  enum object_type type;
  char *buf = repo_read_object_file(the_repository, oid, &type, &size);
  int offset = 0;

  if (!buf)
    return error(_("could not read object %s"), oid_to_hex(oid));

  assert(type == OBJ_TAG);
  while (offset < size && buf[offset] != '\n') {
    int new_offset = offset + 1;
    const char *ident;
    while (new_offset < size && buf[new_offset++] != '\n')
      ; /* do nothing */
    if (skip_prefix(buf + offset, "tagger ", &ident))
      show_tagger(ident, rev);
    offset = new_offset;
  }

  if (offset < size)
    fwrite(buf + offset, size - offset, 1, rev->diffopt.file);
  free(buf);
  return 0;
}

static int show_tree_object(const struct object_id *oid UNUSED,
          struct strbuf *base UNUSED,
          const char *pathname, unsigned mode,
          void *context)
{
  FILE *file = context;
  fprintf(file, "%s%s\n", pathname, S_ISDIR(mode) ? "/" : "");
  return 0;
}

static void show_setup_revisions_tweak(struct rev_info *rev)
{
  if (rev->first_parent_only)
    diff_merges_default_to_first_parent(rev);
  else
    diff_merges_default_to_dense_combined(rev);
  if (!rev->diffopt.output_format)
    rev->diffopt.output_format = DIFF_FORMAT_PATCH;
}

int cmd_show(int argc, const char **argv, const char *prefix)
{
  struct log_config cfg;
  struct rev_info rev;
  unsigned int i;
  struct setup_revision_opt opt;
  struct pathspec match_all;
  int ret = 0;

  log_config_init(&cfg);
  init_diff_ui_defaults();
  git_config(git_log_config, &cfg);

  if (the_repository->gitdir) {
    prepare_repo_settings(the_repository);
    the_repository->settings.command_requires_full_index = 0;
  }

  memset(&match_all, 0, sizeof(match_all));
  repo_init_revisions(the_repository, &rev, prefix);
  git_config(grep_config, &rev.grep_filter);

  rev.diff = 1;
  rev.always_show_header = 1;
  rev.no_walk = 1;
  rev.diffopt.stat_width = -1;  /* Scale to real terminal size */

  memset(&opt, 0, sizeof(opt));
  opt.def = "HEAD";
  opt.tweak = show_setup_revisions_tweak;
  cmd_log_init(argc, argv, prefix, &rev, &opt, &cfg);

  if (!rev.no_walk) {
    ret = cmd_log_walk(&rev);
    release_revisions(&rev);
    log_config_release(&cfg);
    return ret;
  }

  rev.diffopt.no_free = 1;
  for (i = 0; i < rev.pending.nr && !ret; i++) {
    struct object *o = rev.pending.objects[i].item;
    const char *name = rev.pending.objects[i].name;
    switch (o->type) {
    case OBJ_BLOB:
      ret = show_blob_object(&o->oid, &rev, name);
      break;
    case OBJ_TAG: {
      struct tag *t = (struct tag *)o;
      struct object_id *oid = get_tagged_oid(t);

      if (rev.shown_one)
        putchar('\n');
      fprintf(rev.diffopt.file, "%stag %s%s\n",
          diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
          t->tag,
          diff_get_color_opt(&rev.diffopt, DIFF_RESET));
      ret = show_tag_object(&o->oid, &rev);
      rev.shown_one = 1;
      if (ret)
        break;
      o = parse_object(the_repository, oid);
      if (!o)
        ret = error(_("could not read object %s"),
              oid_to_hex(oid));
      rev.pending.objects[i].item = o;
      i--;
      break;
    }
    case OBJ_TREE:
      if (rev.shown_one)
        putchar('\n');
      fprintf(rev.diffopt.file, "%stree %s%s\n\n",
          diff_get_color_opt(&rev.diffopt, DIFF_COMMIT),
          name,
          diff_get_color_opt(&rev.diffopt, DIFF_RESET));
      read_tree(the_repository, (struct tree *)o,
          &match_all, show_tree_object,
          rev.diffopt.file);
      rev.shown_one = 1;
      break;
    case OBJ_COMMIT:
    {
      struct object_array old;
      struct object_array blank = OBJECT_ARRAY_INIT;

      memcpy(&old, &rev.pending, sizeof(old));
      memcpy(&rev.pending, &blank, sizeof(rev.pending));

      add_object_array(o, name, &rev.pending);
      ret = cmd_log_walk_no_free(&rev);

      /*
       * No need for
       * object_array_clear(&pending). It was
       * cleared already in prepare_revision_walk()
       */
      memcpy(&rev.pending, &old, sizeof(rev.pending));
      break;
    }
    default:
      ret = error(_("unknown type: %d"), o->type);
    }
  }

  rev.diffopt.no_free = 0;
  diff_free(&rev.diffopt);
  release_revisions(&rev);
  log_config_release(&cfg);

  return ret;
}

/*
 * This is equivalent to "git log -g --abbrev-commit --pretty=oneline"
 */
int cmd_log_reflog(int argc, const char **argv, const char *prefix)
{
  struct log_config cfg;
  struct rev_info rev;
  struct setup_revision_opt opt;
  int ret;

  log_config_init(&cfg);
  init_diff_ui_defaults();
  git_config(git_log_config, &cfg);

  repo_init_revisions(the_repository, &rev, prefix);
  init_reflog_walk(&rev.reflog_info);
  git_config(grep_config, &rev.grep_filter);

  rev.verbose_header = 1;
  memset(&opt, 0, sizeof(opt));
  opt.def = "HEAD";
  cmd_log_init_defaults(&rev, &cfg);
  rev.abbrev_commit = 1;
  rev.commit_format = CMIT_FMT_ONELINE;
  rev.use_terminator = 1;
  rev.always_show_header = 1;
  cmd_log_init_finish(argc, argv, prefix, &rev, &opt, &cfg);

  ret = cmd_log_walk(&rev);

  release_revisions(&rev);
  log_config_release(&cfg);
  return ret;
}

static void log_setup_revisions_tweak(struct rev_info *rev)
{
  if (rev->diffopt.flags.default_follow_renames &&
      diff_check_follow_pathspec(&rev->prune_data, 0))
    rev->diffopt.flags.follow_renames = 1;

  if (rev->first_parent_only)
    diff_merges_default_to_first_parent(rev);
}

int cmd_log(int argc, const char **argv, const char *prefix)
{
  struct log_config cfg;
  struct rev_info rev;
  struct setup_revision_opt opt;
  int ret;

  log_config_init(&cfg);
  init_diff_ui_defaults();
  git_config(git_log_config, &cfg);

  repo_init_revisions(the_repository, &rev, prefix);
  git_config(grep_config, &rev.grep_filter);

  rev.always_show_header = 1;
  memset(&opt, 0, sizeof(opt));
  opt.def = "HEAD";
  opt.revarg_opt = REVARG_COMMITTISH;
  opt.tweak = log_setup_revisions_tweak;
  cmd_log_init(argc, argv, prefix, &rev, &opt, &cfg);

  ret = cmd_log_walk(&rev);

  release_revisions(&rev);
  log_config_release(&cfg);
  return ret;
}

/* format-patch */

enum cover_setting {
  COVER_UNSET,
  COVER_OFF,
  COVER_ON,
  COVER_AUTO
};

enum thread_level {
  THREAD_UNSET,
  THREAD_SHALLOW,
  THREAD_DEEP
};

enum cover_from_description {
  COVER_FROM_NONE,
  COVER_FROM_MESSAGE,
  COVER_FROM_SUBJECT,
  COVER_FROM_AUTO
};

enum auto_base_setting {
  AUTO_BASE_NEVER,
  AUTO_BASE_ALWAYS,
  AUTO_BASE_WHEN_ABLE
};

struct format_config {
  struct log_config log;
  enum thread_level thread;
  int do_signoff;
  enum auto_base_setting auto_base;
  char *base_commit;
  char *from;
  char *signature;
  char *signature_file;
  enum cover_setting config_cover_letter;
  char *config_output_directory;
  enum cover_from_description cover_from_description_mode;
  int show_notes;
  struct display_notes_opt notes_opt;
  int numbered_cmdline_opt;
  int numbered;
  int auto_number;
  char *default_attach;
  struct string_list extra_hdr;
  struct string_list extra_to;
  struct string_list extra_cc;
  int keep_subject;
  int subject_prefix;
  struct strbuf sprefix;
  char *fmt_patch_suffix;
};

static void format_config_init(struct format_config *cfg)
{
  memset(cfg, 0, sizeof(*cfg));
  log_config_init(&cfg->log);
  cfg->cover_from_description_mode = COVER_FROM_MESSAGE;
  cfg->auto_number = 1;
  string_list_init_dup(&cfg->extra_hdr);
  string_list_init_dup(&cfg->extra_to);
  string_list_init_dup(&cfg->extra_cc);
  strbuf_init(&cfg->sprefix, 0);
  cfg->fmt_patch_suffix = xstrdup(".patch");
}

static void format_config_release(struct format_config *cfg)
{
  log_config_release(&cfg->log);
  free(cfg->base_commit);
  free(cfg->from);
  free(cfg->signature);
  free(cfg->signature_file);
  free(cfg->config_output_directory);
  free(cfg->default_attach);
  string_list_clear(&cfg->extra_hdr, 0);
  string_list_clear(&cfg->extra_to, 0);
  string_list_clear(&cfg->extra_cc, 0);
  strbuf_release(&cfg->sprefix);
  free(cfg->fmt_patch_suffix);
}

static enum cover_from_description parse_cover_from_description(const char *arg)
{
  if (!arg || !strcmp(arg, "default"))
    return COVER_FROM_MESSAGE;
  else if (!strcmp(arg, "none"))
    return COVER_FROM_NONE;
  else if (!strcmp(arg, "message"))
    return COVER_FROM_MESSAGE;
  else if (!strcmp(arg, "subject"))
    return COVER_FROM_SUBJECT;
  else if (!strcmp(arg, "auto"))
    return COVER_FROM_AUTO;
  else
    die(_("%s: invalid cover from description mode"), arg);
}

static void add_header(struct format_config *cfg, const char *value)
{
  struct string_list_item *item;
  int len = strlen(value);
  while (len && value[len - 1] == '\n')
    len--;

  if (!strncasecmp(value, "to: ", 4)) {
    item = string_list_append(&cfg->extra_to, value + 4);
    len -= 4;
  } else if (!strncasecmp(value, "cc: ", 4)) {
    item = string_list_append(&cfg->extra_cc, value + 4);
    len -= 4;
  } else {
    item = string_list_append(&cfg->extra_hdr, value);
  }

  item->string[len] = '\0';
}

static int git_format_config(const char *var, const char *value,
           const struct config_context *ctx, void *cb)
{
  struct format_config *cfg = cb;

  if (!strcmp(var, "format.headers")) {
    if (!value)
      die(_("format.headers without value"));
    add_header(cfg, value);
    return 0;
  }
  if (!strcmp(var, "format.suffix")) {
    FREE_AND_NULL(cfg->fmt_patch_suffix);
    return git_config_string(&cfg->fmt_patch_suffix, var, value);
  }
  if (!strcmp(var, "format.to")) {
    if (!value)
      return config_error_nonbool(var);
    string_list_append(&cfg->extra_to, value);
    return 0;
  }
  if (!strcmp(var, "format.cc")) {
    if (!value)
      return config_error_nonbool(var);
    string_list_append(&cfg->extra_cc, value);
    return 0;
  }
  if (!strcmp(var, "diff.color") || !strcmp(var, "color.diff") ||
      !strcmp(var, "color.ui") || !strcmp(var, "diff.submodule")) {
    return 0;
  }
  if (!strcmp(var, "format.numbered")) {
    if (value && !strcasecmp(value, "auto")) {
      cfg->auto_number = 1;
      return 0;
    }
    cfg->numbered = git_config_bool(var, value);
    cfg->auto_number = cfg->auto_number && cfg->numbered;
    return 0;
  }
  if (!strcmp(var, "format.attach")) {
    if (value && *value) {
      FREE_AND_NULL(cfg->default_attach);
      cfg->default_attach = xstrdup(value);
    } else if (value && !*value) {
      FREE_AND_NULL(cfg->default_attach);
    } else {
      FREE_AND_NULL(cfg->default_attach);
      cfg->default_attach = xstrdup(git_version_string);
    }
    return 0;
  }
  if (!strcmp(var, "format.thread")) {
    if (value && !strcasecmp(value, "deep")) {
      cfg->thread = THREAD_DEEP;
      return 0;
    }
    if (value && !strcasecmp(value, "shallow")) {
      cfg->thread = THREAD_SHALLOW;
      return 0;
    }
    cfg->thread = git_config_bool(var, value) ? THREAD_SHALLOW : THREAD_UNSET;
    return 0;
  }
  if (!strcmp(var, "format.signoff")) {
    cfg->do_signoff = git_config_bool(var, value);
    return 0;
  }
  if (!strcmp(var, "format.signature")) {
    FREE_AND_NULL(cfg->signature);
    return git_config_string(&cfg->signature, var, value);
  }
  if (!strcmp(var, "format.signaturefile")) {
    FREE_AND_NULL(cfg->signature_file);
    return git_config_pathname(&cfg->signature_file, var, value);
  }
  if (!strcmp(var, "format.coverletter")) {
    if (value && !strcasecmp(value, "auto")) {
      cfg->config_cover_letter = COVER_AUTO;
      return 0;
    }
    cfg->config_cover_letter = git_config_bool(var, value) ? COVER_ON : COVER_OFF;
    return 0;
  }
  if (!strcmp(var, "format.outputdirectory")) {
    FREE_AND_NULL(cfg->config_output_directory);
    return git_config_string(&cfg->config_output_directory, var, value);
  }
  if (!strcmp(var, "format.useautobase")) {
    if (value && !strcasecmp(value, "whenAble")) {
      cfg->auto_base = AUTO_BASE_WHEN_ABLE;
      return 0;
    }
    cfg->auto_base = git_config_bool(var, value) ? AUTO_BASE_ALWAYS : AUTO_BASE_NEVER;
    return 0;
  }
  if (!strcmp(var, "format.from")) {
    int b = git_parse_maybe_bool(value);
    FREE_AND_NULL(cfg->from);
    if (b < 0)
      cfg->from = xstrdup(value);
    else if (b)
      cfg->from = xstrdup(git_committer_info(IDENT_NO_DATE));
    return 0;
  }
  if (!strcmp(var, "format.forceinbodyfrom")) {
    force_in_body_from = git_config_bool(var, value);
    return 0;
  }
  if (!strcmp(var, "format.notes")) {
    int b = git_parse_maybe_bool(value);
    if (b < 0)
      enable_ref_display_notes(&cfg->notes_opt, &cfg->show_notes, value);
    else if (b)
      enable_default_display_notes(&cfg->notes_opt, &cfg->show_notes);
    else
      disable_display_notes(&cfg->notes_opt, &cfg->show_notes);
    return 0;
  }
  if (!strcmp(var, "format.coverfromdescription")) {
    cfg->cover_from_description_mode = parse_cover_from_description(value);
    return 0;
  }
  if (!strcmp(var, "format.mboxrd")) {
    stdout_mboxrd = git_config_bool(var, value);
    return 0;
  }
  if (!strcmp(var, "format.noprefix")) {
    format_no_prefix = 1;
    return 0;
  }

  /*
   * ignore some porcelain config which would otherwise be parsed by
   * git_diff_ui_config(), via git_log_config(); we can't just avoid
   * diff_ui_config completely, because we do care about some ui options
   * like color.
   */
  if (!strcmp(var, "diff.noprefix"))
    return 0;

  return git_log_config(var, value, ctx, &cfg->log);
}

static const char *output_directory = NULL;
static int outdir_offset;

static int open_next_file(struct commit *commit, const char *subject,
       struct rev_info *rev, int quiet)
{
  struct strbuf filename = STRBUF_INIT;

  if (output_directory) {
    strbuf_addstr(&filename, output_directory);
    strbuf_complete(&filename, '/');
  }

  if (rev->numbered_files)
    strbuf_addf(&filename, "%d", rev->nr);
  else if (commit)
    fmt_output_commit(&filename, commit, rev);
  else
    fmt_output_subject(&filename, subject, rev);

  if (!quiet)
    printf("%s\n", filename.buf + outdir_offset);

  if (!(rev->diffopt.file = fopen(filename.buf, "w"))) {
    error_errno(_("cannot open patch file %s"), filename.buf);
    strbuf_release(&filename);
    return -1;
  }

  strbuf_release(&filename);
  return 0;
}

static void get_patch_ids(struct rev_info *rev, struct patch_ids *ids)
{
  struct rev_info check_rev;
  struct commit *commit, *c1, *c2;
  struct object *o1, *o2;
  unsigned flags1, flags2;

  if (rev->pending.nr != 2)
    die(_("need exactly one range"));

  o1 = rev->pending.objects[0].item;
  o2 = rev->pending.objects[1].item;
  flags1 = o1->flags;
  flags2 = o2->flags;
  c1 = lookup_commit_reference(the_repository, &o1->oid);
  c2 = lookup_commit_reference(the_repository, &o2->oid);

  if ((flags1 & UNINTERESTING) == (flags2 & UNINTERESTING))
    die(_("not a range"));

  init_patch_ids(the_repository, ids);

  /* given a range a..b get all patch ids for b..a */
  repo_init_revisions(the_repository, &check_rev, rev->prefix);
  check_rev.max_parents = 1;
  o1->flags ^= UNINTERESTING;
  o2->flags ^= UNINTERESTING;
  add_pending_object(&check_rev, o1, "o1");
  add_pending_object(&check_rev, o2, "o2");
  if (prepare_revision_walk(&check_rev))
    die(_("revision walk setup failed"));

  while ((commit = get_revision(&check_rev)) != NULL) {
    add_commit_patch_id(commit, ids);
  }

  /* reset for next revision walk */
  clear_commit_marks(c1, SEEN | UNINTERESTING | SHOWN | ADDED);
  clear_commit_marks(c2, SEEN | UNINTERESTING | SHOWN | ADDED);
  o1->flags = flags1;
  o2->flags = flags2;
}

static void gen_message_id(struct rev_info *info, const char *base)
{
  struct strbuf buf = STRBUF_INIT;
  strbuf_addf(&buf, "%s.%"PRItime".git.%s", base,
        (timestamp_t) time(NULL),
        git_committer_info(IDENT_NO_NAME|IDENT_NO_DATE|IDENT_STRICT));
  info->message_id = strbuf_detach(&buf, NULL);
}

static void print_signature(const char *signature, FILE *file)
{
  if (!signature || !*signature)
    return;

  fprintf(file, "-- \n%s", signature);
  if (signature[strlen(signature)-1] != '\n')
    putc('\n', file);
  putc('\n', file);
}

static char *find_branch_name(struct rev_info *rev)
{
  int i, positive = -1;
  struct object_id branch_oid;
  const struct object_id *tip_oid;
  const char *ref, *v;
  char *full_ref, *branch = NULL;

  for (i = 0; i < rev->cmdline.nr; i++) {
    if (rev->cmdline.rev[i].flags & UNINTERESTING)
      continue;
    if (positive < 0)
      positive = i;
    else
      return NULL;
  }
  if (positive < 0)
    return NULL;
  ref = rev->cmdline.rev[positive].name;
  tip_oid = &rev->cmdline.rev[positive].item->oid;
  if (repo_dwim_ref(the_repository, ref, strlen(ref), &branch_oid,
        &full_ref, 0) &&
      skip_prefix(full_ref, "refs/heads/", &v) &&
      oideq(tip_oid, &branch_oid))
    branch = xstrdup(v);
  free(full_ref);
  return branch;
}

static void show_diffstat(struct rev_info *rev,
        struct commit *origin, struct commit *head)
{
  struct diff_options opts;

  memcpy(&opts, &rev->diffopt, sizeof(opts));
  opts.output_format = DIFF_FORMAT_SUMMARY | DIFF_FORMAT_DIFFSTAT;
  diff_setup_done(&opts);

  diff_tree_oid(get_commit_tree_oid(origin),
          get_commit_tree_oid(head),
          "", &opts);
  diffcore_std(&opts);
  diff_flush(&opts);

  fprintf(rev->diffopt.file, "\n");
}

static void read_desc_file(struct strbuf *buf, const char *desc_file)
{
  if (strbuf_read_file(buf, desc_file, 0) < 0)
    die_errno(_("unable to read branch description file '%s'"),
        desc_file);
}

static void prepare_cover_text(struct pretty_print_context *pp,
             const char *description_file,
             const char *branch_name,
             struct strbuf *sb,
             const char *encoding,
             int need_8bit_cte,
             const struct format_config *cfg)
{
  const char *subject = "*** SUBJECT HERE ***";
  const char *body = "*** BLURB HERE ***";
  struct strbuf description_sb = STRBUF_INIT;
  struct strbuf subject_sb = STRBUF_INIT;

  if (cfg->cover_from_description_mode == COVER_FROM_NONE)
    goto do_pp;

  if (description_file && *description_file)
    read_desc_file(&description_sb, description_file);
  else if (branch_name && *branch_name)
    read_branch_desc(&description_sb, branch_name);
  if (!description_sb.len)
    goto do_pp;

  if (cfg->cover_from_description_mode == COVER_FROM_SUBJECT ||
      cfg->cover_from_description_mode == COVER_FROM_AUTO)
    body = format_subject(&subject_sb, description_sb.buf, " ");

  if (cfg->cover_from_description_mode == COVER_FROM_MESSAGE ||
      (cfg->cover_from_description_mode == COVER_FROM_AUTO &&
       subject_sb.len > COVER_FROM_AUTO_MAX_SUBJECT_LEN))
    body = description_sb.buf;
  else
    subject = subject_sb.buf;

do_pp:
  pp_email_subject(pp, &subject, sb, encoding, need_8bit_cte);
  pp_remainder(pp, &body, sb, 0);

  strbuf_release(&description_sb);
  strbuf_release(&subject_sb);
}

static int get_notes_refs(struct string_list_item *item, void *arg)
{
  strvec_pushf(arg, "--notes=%s", item->string);
  return 0;
}

static void get_notes_args(struct strvec *arg, struct rev_info *rev)
{
  if (!rev->show_notes) {
    strvec_push(arg, "--no-notes");
  } else if (rev->notes_opt.use_default_notes > 0 ||
       (rev->notes_opt.use_default_notes == -1 &&
        !rev->notes_opt.extra_notes_refs.nr)) {
    strvec_push(arg, "--notes");
  } else {
    for_each_string_list(&rev->notes_opt.extra_notes_refs, get_notes_refs, arg);
  }
}

static void make_cover_letter(struct rev_info *rev, int use_separate_file,
            struct commit *origin,
            int nr, struct commit **list,
            const char *description_file,
            const char *branch_name,
            int quiet,
            const struct format_config *cfg)
{
  const char *committer;
  struct shortlog log;
  struct strbuf sb = STRBUF_INIT;
  int i;
  const char *encoding = "UTF-8";
  int need_8bit_cte = 0;
  struct pretty_print_context pp = {0};
  struct commit *head = list[0];
  char *to_free = NULL;

  if (!cmit_fmt_is_mail(rev->commit_format))
    die(_("cover letter needs email format"));

  committer = git_committer_info(0);

  if (use_separate_file &&
      open_next_file(NULL, rev->numbered_files ? NULL : "cover-letter", rev, quiet))
    die(_("failed to create cover-letter file"));

  log_write_email_headers(rev, head, &pp.after_subject, &need_8bit_cte, 0);

  for (i = 0; !need_8bit_cte && i < nr; i++) {
    const char *buf = repo_get_commit_buffer(the_repository,
               list[i], NULL);
    if (has_non_ascii(buf))
      need_8bit_cte = 1;
    repo_unuse_commit_buffer(the_repository, list[i], buf);
  }

  if (!branch_name)
    branch_name = to_free = find_branch_name(rev);

  pp.fmt = CMIT_FMT_EMAIL;
  pp.date_mode.type = DATE_RFC2822;
  pp.rev = rev;
  pp.encode_email_headers = rev->encode_email_headers;
  pp_user_info(&pp, NULL, &sb, committer, encoding);
  prepare_cover_text(&pp, description_file, branch_name, &sb,
         encoding, need_8bit_cte, cfg);
  fprintf(rev->diffopt.file, "%s\n", sb.buf);

  free(to_free);
  free(pp.after_subject);
  strbuf_release(&sb);

  shortlog_init(&log);
  log.wrap_lines = 1;
  log.wrap = MAIL_DEFAULT_WRAP;
  log.in1 = 2;
  log.in2 = 4;
  log.file = rev->diffopt.file;
  log.groups = SHORTLOG_GROUP_AUTHOR;
  shortlog_finish_setup(&log);
  for (i = 0; i < nr; i++)
    shortlog_add_commit(&log, list[i]);

  shortlog_output(&log);

  /* We can only do diffstat with a unique reference point */
  if (origin)
    show_diffstat(rev, origin, head);

  if (rev->idiff_oid1) {
    fprintf_ln(rev->diffopt.file, "%s", rev->idiff_title);
    show_interdiff(rev->idiff_oid1, rev->idiff_oid2, 0,
             &rev->diffopt);
  }

  if (rev->rdiff1) {
    /*
     * Pass minimum required diff-options to range-diff; others
     * can be added later if deemed desirable.
     */
    struct diff_options opts;
    struct strvec other_arg = STRVEC_INIT;
    struct range_diff_options range_diff_opts = {
      .creation_factor = rev->creation_factor,
      .dual_color = 1,
      .diffopt = &opts,
      .other_arg = &other_arg
    };

    repo_diff_setup(the_repository, &opts);
    opts.file = rev->diffopt.file;
    opts.use_color = rev->diffopt.use_color;
    diff_setup_done(&opts);
    fprintf_ln(rev->diffopt.file, "%s", rev->rdiff_title);
    get_notes_args(&other_arg, rev);
    show_range_diff(rev->rdiff1, rev->rdiff2, &range_diff_opts);
    strvec_clear(&other_arg);
  }
}

static char *clean_message_id(const char *msg_id)
{
  char ch;
  const char *a, *z, *m;

  m = msg_id;
  while ((ch = *m) && (isspace(ch) || (ch == '<')))
    m++;
  a = m;
  z = NULL;
  while ((ch = *m)) {
    if (!isspace(ch) && (ch != '>'))
      z = m;
    m++;
  }
  if (!z)
    die(_("insane in-reply-to: %s"), msg_id);
  if (++z == m)
    return xstrdup(a);
  return xmemdupz(a, z - a);
}

static const char *set_outdir(const char *prefix, const char *output_directory)
{
  if (output_directory && is_absolute_path(output_directory))
    return output_directory;

  if (!prefix || !*prefix) {
    if (output_directory)
      return output_directory;
    /* The user did not explicitly ask for "./" */
    outdir_offset = 2;
    return "./";
  }

  outdir_offset = strlen(prefix);
  if (!output_directory)
    return prefix;

  return prefix_filename(prefix, output_directory);
}

static const char * const builtin_format_patch_usage[] = {
  N_("git format-patch [<options>] [<since> | <revision-range>]"),
  NULL
};

struct keep_callback_data {
  struct format_config *cfg;
  struct rev_info *revs;
};

static int keep_callback(const struct option *opt, const char *arg, int unset)
{
  struct keep_callback_data *data = opt->value;
  BUG_ON_OPT_NEG(unset);
  BUG_ON_OPT_ARG(arg);
  data->revs->total = -1;
  data->cfg->keep_subject = 1;
  return 0;
}

static int subject_prefix_callback(const struct option *opt, const char *arg,
          int unset)
{
  struct format_config *cfg = opt->value;

  BUG_ON_OPT_NEG(unset);
  cfg->subject_prefix = 1;
  strbuf_reset(&cfg->sprefix);
  strbuf_addstr(&cfg->sprefix, arg);
  return 0;
}

static int rfc_callback(const struct option *opt, const char *arg,
      int unset)
{
  const char **rfc = opt->value;

  *rfc = opt->value;
  if (unset)
    *rfc = NULL;
  else
    *rfc = arg ? arg : "RFC";
  return 0;
}

static int numbered_callback(const struct option *opt, const char *arg,
           int unset)
{
  struct format_config *cfg = opt->value;
  BUG_ON_OPT_ARG(arg);
  cfg->numbered = cfg->numbered_cmdline_opt = unset ? 0 : 1;
  if (unset)
    cfg->auto_number =  0;
  return 0;
}

static int no_numbered_callback(const struct option *opt, const char *arg,
        int unset)
{
  BUG_ON_OPT_NEG(unset);
  return numbered_callback(opt, arg, 1);
}

static int output_directory_callback(const struct option *opt, const char *arg,
            int unset)
{
  const char **dir = (const char **)opt->value;
  BUG_ON_OPT_NEG(unset);
  if (*dir)
    die(_("two output directories?"));
  *dir = arg;
  return 0;
}

static int thread_callback(const struct option *opt, const char *arg, int unset)
{
  struct format_config *cfg = opt->value;

  if (unset)
    cfg->thread = THREAD_UNSET;
  else if (!arg || !strcmp(arg, "shallow"))
    cfg->thread = THREAD_SHALLOW;
  else if (!strcmp(arg, "deep"))
    cfg->thread = THREAD_DEEP;
  /*
   * Please update _git_formatpatch() in git-completion.bash
   * when you add new options.
   */
  else
    return 1;
  return 0;
}

static int attach_callback(const struct option *opt, const char *arg, int unset)
{
  struct rev_info *rev = (struct rev_info *)opt->value;
  if (unset)
    rev->mime_boundary = NULL;
  else if (arg)
    rev->mime_boundary = arg;
  else
    rev->mime_boundary = git_version_string;
  rev->no_inline = unset ? 0 : 1;
  return 0;
}

static int inline_callback(const struct option *opt, const char *arg, int unset)
{
  struct rev_info *rev = (struct rev_info *)opt->value;
  if (unset)
    rev->mime_boundary = NULL;
  else if (arg)
    rev->mime_boundary = arg;
  else
    rev->mime_boundary = git_version_string;
  rev->no_inline = 0;
  return 0;
}

static int header_callback(const struct option *opt, const char *arg,
         int unset)
{
  struct format_config *cfg = opt->value;

  if (unset) {
    string_list_clear(&cfg->extra_hdr, 0);
    string_list_clear(&cfg->extra_to, 0);
    string_list_clear(&cfg->extra_cc, 0);
  } else {
    add_header(cfg, arg);
  }
  return 0;
}

static int from_callback(const struct option *opt, const char *arg, int unset)
{
  char **from = opt->value;

  free(*from);

  if (unset)
    *from = NULL;
  else if (arg)
    *from = xstrdup(arg);
  else
    *from = xstrdup(git_committer_info(IDENT_NO_DATE));
  return 0;
}

static int base_callback(const struct option *opt, const char *arg, int unset)
{
  struct format_config *cfg = opt->value;

  if (unset) {
    cfg->auto_base = AUTO_BASE_NEVER;
    FREE_AND_NULL(cfg->base_commit);
  } else if (!strcmp(arg, "auto")) {
    cfg->auto_base = AUTO_BASE_ALWAYS;
    FREE_AND_NULL(cfg->base_commit);
  } else {
    cfg->auto_base = AUTO_BASE_NEVER;
    cfg->base_commit = xstrdup(arg);
  }
  return 0;
}

struct base_tree_info {
  struct object_id base_commit;
  int nr_patch_id, alloc_patch_id;
  struct object_id *patch_id;
};

static struct commit *get_base_commit(const struct format_config *cfg,
              struct commit **list,
              int total)
{
  struct commit *base = NULL;
  struct commit **rev;
  int i = 0, rev_nr = 0, auto_select, die_on_failure, ret;

  switch (cfg->auto_base) {
  case AUTO_BASE_NEVER:
    if (cfg->base_commit) {
      auto_select = 0;
      die_on_failure = 1;
    } else {
      /* no base information is requested */
      return NULL;
    }
    break;
  case AUTO_BASE_ALWAYS:
  case AUTO_BASE_WHEN_ABLE:
    if (cfg->base_commit) {
      BUG("requested automatic base selection but a commit was provided");
    } else {
      auto_select = 1;
      die_on_failure = cfg->auto_base == AUTO_BASE_ALWAYS;
    }
    break;
  default:
    BUG("unexpected automatic base selection method");
  }

  if (!auto_select) {
    base = lookup_commit_reference_by_name(cfg->base_commit);
    if (!base)
      die(_("unknown commit %s"), cfg->base_commit);
  } else {
    struct branch *curr_branch = branch_get(NULL);
    const char *upstream = branch_get_upstream(curr_branch, NULL);
    if (upstream) {
      struct commit_list *base_list = NULL;
      struct commit *commit;
      struct object_id oid;

      if (repo_get_oid(the_repository, upstream, &oid)) {
        if (die_on_failure)
          die(_("failed to resolve '%s' as a valid ref"), upstream);
        else
          return NULL;
      }
      commit = lookup_commit_or_die(&oid, "upstream base");
      if (repo_get_merge_bases_many(the_repository,
                  commit, total,
                  list,
                  &base_list) < 0 ||
          /* There should be one and only one merge base. */
          !base_list || base_list->next) {
        if (die_on_failure) {
          die(_("could not find exact merge base"));
        } else {
          free_commit_list(base_list);
          return NULL;
        }
      }
      base = base_list->item;
      free_commit_list(base_list);
    } else {
      if (die_on_failure)
        die(_("failed to get upstream, if you want to record base commit automatically,\n"
              "please use git branch --set-upstream-to to track a remote branch.\n"
              "Or you could specify base commit by --base=<base-commit-id> manually"));
      else
        return NULL;
    }
  }

  ALLOC_ARRAY(rev, total);
  for (i = 0; i < total; i++)
    rev[i] = list[i];

  rev_nr = total;
  /*
   * Get merge base through pair-wise computations
   * and store it in rev[0].
   */
  while (rev_nr > 1) {
    for (i = 0; i < rev_nr / 2; i++) {
      struct commit_list *merge_base = NULL;
      if (repo_get_merge_bases(the_repository,
             rev[2 * i],
             rev[2 * i + 1], &merge_base) < 0 ||
          !merge_base || merge_base->next) {
        if (die_on_failure) {
          die(_("failed to find exact merge base"));
        } else {
          free_commit_list(merge_base);
          free(rev);
          return NULL;
        }
      }

      rev[i] = merge_base->item;
      free_commit_list(merge_base);
    }

    if (rev_nr % 2)
      rev[i] = rev[2 * i];
    rev_nr = DIV_ROUND_UP(rev_nr, 2);
  }

  ret = repo_in_merge_bases(the_repository, base, rev[0]);
  if (ret < 0)
    exit(128);
  if (!ret) {
    if (die_on_failure) {
      die(_("base commit should be the ancestor of revision list"));
    } else {
      free(rev);
      return NULL;
    }
  }

  for (i = 0; i < total; i++) {
    if (base == list[i]) {
      if (die_on_failure) {
        die(_("base commit shouldn't be in revision list"));
      } else {
        free(rev);
        return NULL;
      }
    }
  }

  free(rev);
  return base;
}

define_commit_slab(commit_base, int);

static void prepare_bases(struct base_tree_info *bases,
        struct commit *base,
        struct commit **list,
        int total)
{
  struct commit *commit;
  struct rev_info revs;
  struct diff_options diffopt;
  struct commit_base commit_base;
  int i;

  if (!base)
    return;

  init_commit_base(&commit_base);
  repo_diff_setup(the_repository, &diffopt);
  diffopt.flags.recursive = 1;
  diff_setup_done(&diffopt);

  oidcpy(&bases->base_commit, &base->object.oid);

  repo_init_revisions(the_repository, &revs, NULL);
  revs.max_parents = 1;
  revs.topo_order = 1;
  for (i = 0; i < total; i++) {
    list[i]->object.flags &= ~UNINTERESTING;
    add_pending_object(&revs, &list[i]->object, "rev_list");
    *commit_base_at(&commit_base, list[i]) = 1;
  }
  base->object.flags |= UNINTERESTING;
  add_pending_object(&revs, &base->object, "base");

  if (prepare_revision_walk(&revs))
    die(_("revision walk setup failed"));
  /*
   * Traverse the commits list, get prerequisite patch ids
   * and stuff them in bases structure.
   */
  while ((commit = get_revision(&revs)) != NULL) {
    struct object_id oid;
    struct object_id *patch_id;
    if (*commit_base_at(&commit_base, commit))
      continue;
    if (commit_patch_id(commit, &diffopt, &oid, 0))
      die(_("cannot get patch id"));
    ALLOC_GROW(bases->patch_id, bases->nr_patch_id + 1, bases->alloc_patch_id);
    patch_id = bases->patch_id + bases->nr_patch_id;
    oidcpy(patch_id, &oid);
    bases->nr_patch_id++;
  }
  clear_commit_base(&commit_base);
}

static void print_bases(struct base_tree_info *bases, FILE *file)
{
  int i;

  /* Only do this once, either for the cover or for the first one */
  if (is_null_oid(&bases->base_commit))
    return;

  /* Show the base commit */
  fprintf(file, "\nbase-commit: %s\n", oid_to_hex(&bases->base_commit));

  /* Show the prerequisite patches */
  for (i = bases->nr_patch_id - 1; i >= 0; i--)
    fprintf(file, "prerequisite-patch-id: %s\n", oid_to_hex(&bases->patch_id[i]));

  free(bases->patch_id);
  bases->nr_patch_id = 0;
  bases->alloc_patch_id = 0;
  oidclr(&bases->base_commit, the_repository->hash_algo);
}

static const char *diff_title(struct strbuf *sb,
            const char *reroll_count,
            const char *generic,
            const char *rerolled)
{
  int v;

  /* RFC may be v0, so allow -v1 to diff against v0 */
  if (reroll_count && !strtol_i(reroll_count, 10, &v) &&
      v >= 1)
    strbuf_addf(sb, rerolled, v - 1);
  else
    strbuf_addstr(sb, generic);
  return sb->buf;
}

static void infer_range_diff_ranges(struct strbuf *r1,
            struct strbuf *r2,
            const char *prev,
            struct commit *origin,
            struct commit *head)
{
  const char *head_oid = oid_to_hex(&head->object.oid);
  int prev_is_range = is_range_diff_range(prev);

  if (prev_is_range)
    strbuf_addstr(r1, prev);
  else
    strbuf_addf(r1, "%s..%s", head_oid, prev);

  if (origin)
    strbuf_addf(r2, "%s..%s", oid_to_hex(&origin->object.oid), head_oid);
  else if (prev_is_range)
    die(_("failed to infer range-diff origin of current series"));
  else {
    warning(_("using '%s' as range-diff origin of current series"), prev);
    strbuf_addf(r2, "%s..%s", prev, head_oid);
  }
}

int cmd_format_patch(int argc, const char **argv, const char *prefix)
{
  struct format_config cfg;
  struct commit *commit;
  struct commit **list = NULL;
  struct rev_info rev;
  char *to_free = NULL;
  struct setup_revision_opt s_r_opt;
  int nr = 0, total, i;
  int use_stdout = 0;
  int start_number = -1;
  int just_numbers = 0;
  int ignore_if_in_upstream = 0;
  int cover_letter = -1;
  int boundary_count = 0;
  int no_binary_diff = 0;
  int zero_commit = 0;
  struct commit *origin = NULL;
  const char *in_reply_to = NULL;
  struct patch_ids ids;
  struct strbuf buf = STRBUF_INIT;
  int use_patch_format = 0;
  int quiet = 0;
  const char *reroll_count = NULL;
  char *cover_from_description_arg = NULL;
  char *description_file = NULL;
  char *branch_name = NULL;
  struct base_tree_info bases;
  struct commit *base;
  int show_progress = 0;
  struct progress *progress = NULL;
  struct oid_array idiff_prev = OID_ARRAY_INIT;
  struct strbuf idiff_title = STRBUF_INIT;
  const char *rdiff_prev = NULL;
  struct strbuf rdiff1 = STRBUF_INIT;
  struct strbuf rdiff2 = STRBUF_INIT;
  struct strbuf rdiff_title = STRBUF_INIT;
  const char *rfc = NULL;
  int creation_factor = -1;
  const char *signature = git_version_string;
  char *signature_to_free = NULL;
  char *signature_file_arg = NULL;
  struct keep_callback_data keep_callback_data = {
    .cfg = &cfg,
    .revs = &rev,
  };
  const char *fmt_patch_suffix = NULL;

  const struct option builtin_format_patch_options[] = {
    OPT_CALLBACK_F('n', "numbered", &cfg, NULL,
          N_("use [PATCH n/m] even with a single patch"),
          PARSE_OPT_NOARG, numbered_callback),
    OPT_CALLBACK_F('N', "no-numbered", &cfg, NULL,
          N_("use [PATCH] even with multiple patches"),
          PARSE_OPT_NOARG | PARSE_OPT_NONEG, no_numbered_callback),
    OPT_BOOL('s', "signoff", &cfg.do_signoff, N_("add a Signed-off-by trailer")),
    OPT_BOOL(0, "stdout", &use_stdout,
          N_("print patches to standard out")),
    OPT_BOOL(0, "cover-letter", &cover_letter,
          N_("generate a cover letter")),
    OPT_BOOL(0, "numbered-files", &just_numbers,
          N_("use simple number sequence for output file names")),
    OPT_STRING(0, "suffix", &fmt_patch_suffix, N_("sfx"),
          N_("use <sfx> instead of '.patch'")),
    OPT_INTEGER(0, "start-number", &start_number,
          N_("start numbering patches at <n> instead of 1")),
    OPT_STRING('v', "reroll-count", &reroll_count, N_("reroll-count"),
          N_("mark the series as Nth re-roll")),
    OPT_INTEGER(0, "filename-max-length", &cfg.log.fmt_patch_name_max,
          N_("max length of output filename")),
    OPT_CALLBACK_F(0, "rfc", &rfc, N_("rfc"),
             N_("add <rfc> (default 'RFC') before 'PATCH'"),
             PARSE_OPT_OPTARG, rfc_callback),
    OPT_STRING(0, "cover-from-description", &cover_from_description_arg,
          N_("cover-from-description-mode"),
          N_("generate parts of a cover letter based on a branch's description")),
    OPT_FILENAME(0, "description-file", &description_file,
           N_("use branch description from file")),
    OPT_CALLBACK_F(0, "subject-prefix", &cfg, N_("prefix"),
          N_("use [<prefix>] instead of [PATCH]"),
          PARSE_OPT_NONEG, subject_prefix_callback),
    OPT_CALLBACK_F('o', "output-directory", &output_directory,
          N_("dir"), N_("store resulting files in <dir>"),
          PARSE_OPT_NONEG, output_directory_callback),
    OPT_CALLBACK_F('k', "keep-subject", &keep_callback_data, NULL,
          N_("don't strip/add [PATCH]"),
          PARSE_OPT_NOARG | PARSE_OPT_NONEG, keep_callback),
    OPT_BOOL(0, "no-binary", &no_binary_diff,
       N_("don't output binary diffs")),
    OPT_BOOL(0, "zero-commit", &zero_commit,
       N_("output all-zero hash in From header")),
    OPT_BOOL(0, "ignore-if-in-upstream", &ignore_if_in_upstream,
       N_("don't include a patch matching a commit upstream")),
    OPT_SET_INT_F('p', "no-stat", &use_patch_format,
            N_("show patch format instead of default (patch + stat)"),
            1, PARSE_OPT_NONEG),
    OPT_GROUP(N_("Messaging")),
    OPT_CALLBACK(0, "add-header", &cfg, N_("header"),
          N_("add email header"), header_callback),
    OPT_STRING_LIST(0, "to", &cfg.extra_to, N_("email"), N_("add To: header")),
    OPT_STRING_LIST(0, "cc", &cfg.extra_cc, N_("email"), N_("add Cc: header")),
    OPT_CALLBACK_F(0, "from", &cfg.from, N_("ident"),
          N_("set From address to <ident> (or committer ident if absent)"),
          PARSE_OPT_OPTARG, from_callback),
    OPT_STRING(0, "in-reply-to", &in_reply_to, N_("message-id"),
          N_("make first mail a reply to <message-id>")),
    OPT_CALLBACK_F(0, "attach", &rev, N_("boundary"),
          N_("attach the patch"), PARSE_OPT_OPTARG,
          attach_callback),
    OPT_CALLBACK_F(0, "inline", &rev, N_("boundary"),
          N_("inline the patch"),
          PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
          inline_callback),
    OPT_CALLBACK_F(0, "thread", &cfg, N_("style"),
          N_("enable message threading, styles: shallow, deep"),
          PARSE_OPT_OPTARG, thread_callback),
    OPT_STRING(0, "signature", &signature, N_("signature"),
          N_("add a signature")),
    OPT_CALLBACK_F(0, "base", &cfg, N_("base-commit"),
             N_("add prerequisite tree info to the patch series"),
             0, base_callback),
    OPT_FILENAME(0, "signature-file", &signature_file_arg,
        N_("add a signature from a file")),
    OPT__QUIET(&quiet, N_("don't print the patch filenames")),
    OPT_BOOL(0, "progress", &show_progress,
       N_("show progress while generating patches")),
    OPT_CALLBACK(0, "interdiff", &idiff_prev, N_("rev"),
           N_("show changes against <rev> in cover letter or single patch"),
           parse_opt_object_name),
    OPT_STRING(0, "range-diff", &rdiff_prev, N_("refspec"),
         N_("show changes against <refspec> in cover letter or single patch")),
    OPT_INTEGER(0, "creation-factor", &creation_factor,
          N_("percentage by which creation is weighted")),
    OPT_BOOL(0, "force-in-body-from", &force_in_body_from,
       N_("show in-body From: even if identical to the e-mail header")),
    OPT_END()
  };

  format_config_init(&cfg);
  init_diff_ui_defaults();
  init_display_notes(&cfg.notes_opt);
  git_config(git_format_config, &cfg);
  repo_init_revisions(the_repository, &rev, prefix);
  git_config(grep_config, &rev.grep_filter);

  rev.show_notes = cfg.show_notes;
  memcpy(&rev.notes_opt, &cfg.notes_opt, sizeof(cfg.notes_opt));
  rev.commit_format = CMIT_FMT_EMAIL;
  rev.encode_email_headers = cfg.log.default_encode_email_headers;
  rev.expand_tabs_in_log_default = 0;
  rev.verbose_header = 1;
  rev.diff = 1;
  rev.max_parents = 1;
  rev.diffopt.flags.recursive = 1;
  rev.diffopt.no_free = 1;
  memset(&s_r_opt, 0, sizeof(s_r_opt));
  s_r_opt.def = "HEAD";
  s_r_opt.revarg_opt = REVARG_COMMITTISH;

  strbuf_addstr(&cfg.sprefix, cfg.log.fmt_patch_subject_prefix);
  if (format_no_prefix)
    diff_set_noprefix(&rev.diffopt);

  if (cfg.default_attach) {
    rev.mime_boundary = cfg.default_attach;
    rev.no_inline = 1;
  }

  /*
   * Parse the arguments before setup_revisions(), or something
   * like "git format-patch -o a123 HEAD^.." may fail; a123 is
   * possibly a valid SHA1.
   */
  argc = parse_options(argc, argv, prefix, builtin_format_patch_options,
           builtin_format_patch_usage,
           PARSE_OPT_KEEP_ARGV0 | PARSE_OPT_KEEP_UNKNOWN_OPT |
           PARSE_OPT_KEEP_DASHDASH);

  rev.force_in_body_from = force_in_body_from;

  if (!fmt_patch_suffix)
    fmt_patch_suffix = cfg.fmt_patch_suffix;

  /* Make sure "0000-$sub.patch" gives non-negative length for $sub */
  if (cfg.log.fmt_patch_name_max <= strlen("0000-") + strlen(fmt_patch_suffix))
    cfg.log.fmt_patch_name_max = strlen("0000-") + strlen(fmt_patch_suffix);

  if (cover_from_description_arg)
    cfg.cover_from_description_mode = parse_cover_from_description(cover_from_description_arg);

  if (rfc && rfc[0]) {
    cfg.subject_prefix = 1;
    if (rfc[0] == '-')
      strbuf_addf(&cfg.sprefix, " %s", rfc + 1);
    else
      strbuf_insertf(&cfg.sprefix, 0, "%s ", rfc);
  }

  if (reroll_count) {
    strbuf_addf(&cfg.sprefix, " v%s", reroll_count);
    rev.reroll_count = reroll_count;
  }

  rev.subject_prefix = cfg.sprefix.buf;

  for (i = 0; i < cfg.extra_hdr.nr; i++) {
    strbuf_addstr(&buf, cfg.extra_hdr.items[i].string);
    strbuf_addch(&buf, '\n');
  }

  if (cfg.extra_to.nr)
    strbuf_addstr(&buf, "To: ");
  for (i = 0; i < cfg.extra_to.nr; i++) {
    if (i)
      strbuf_addstr(&buf, "    ");
    strbuf_addstr(&buf, cfg.extra_to.items[i].string);
    if (i + 1 < cfg.extra_to.nr)
      strbuf_addch(&buf, ',');
    strbuf_addch(&buf, '\n');
  }

  if (cfg.extra_cc.nr)
    strbuf_addstr(&buf, "Cc: ");
  for (i = 0; i < cfg.extra_cc.nr; i++) {
    if (i)
      strbuf_addstr(&buf, "    ");
    strbuf_addstr(&buf, cfg.extra_cc.items[i].string);
    if (i + 1 < cfg.extra_cc.nr)
      strbuf_addch(&buf, ',');
    strbuf_addch(&buf, '\n');
  }

  rev.extra_headers = to_free = strbuf_detach(&buf, NULL);

  if (cfg.from) {
    if (split_ident_line(&rev.from_ident, cfg.from, strlen(cfg.from)))
      die(_("invalid ident line: %s"), cfg.from);
  }

  if (start_number < 0)
    start_number = 1;

  /*
   * If numbered is set solely due to format.numbered in config,
   * and it would conflict with --keep-subject (-k) from the
   * command line, reset "numbered".
   */
  if (cfg.numbered && cfg.keep_subject && !cfg.numbered_cmdline_opt)
    cfg.numbered = 0;

  if (cfg.numbered && cfg.keep_subject)
    die(_("options '%s' and '%s' cannot be used together"), "-n", "-k");
  if (cfg.keep_subject && cfg.subject_prefix)
    die(_("options '%s' and '%s' cannot be used together"), "--subject-prefix/--rfc", "-k");
  rev.preserve_subject = cfg.keep_subject;

  argc = setup_revisions(argc, argv, &rev, &s_r_opt);
  if (argc > 1)
    die(_("unrecognized argument: %s"), argv[1]);

  if (rev.diffopt.output_format & DIFF_FORMAT_NAME)
    die(_("--name-only does not make sense"));
  if (rev.diffopt.output_format & DIFF_FORMAT_NAME_STATUS)
    die(_("--name-status does not make sense"));
  if (rev.diffopt.output_format & DIFF_FORMAT_CHECKDIFF)
    die(_("--check does not make sense"));
  if (rev.remerge_diff)
    die(_("--remerge-diff does not make sense"));

  if (!use_patch_format &&
    (!rev.diffopt.output_format ||
     rev.diffopt.output_format == DIFF_FORMAT_PATCH))
    rev.diffopt.output_format = DIFF_FORMAT_DIFFSTAT | DIFF_FORMAT_SUMMARY;
  if (!rev.diffopt.stat_width)
    rev.diffopt.stat_width = MAIL_DEFAULT_WRAP;

  /* Always generate a patch */
  rev.diffopt.output_format |= DIFF_FORMAT_PATCH;
  rev.always_show_header = 1;

  rev.zero_commit = zero_commit;
  rev.patch_name_max = cfg.log.fmt_patch_name_max;

  if (!rev.diffopt.flags.text && !no_binary_diff)
    rev.diffopt.flags.binary = 1;

  if (rev.show_notes)
    load_display_notes(&rev.notes_opt);

  die_for_incompatible_opt3(use_stdout, "--stdout",
          rev.diffopt.close_file, "--output",
          !!output_directory, "--output-directory");

  if (use_stdout && stdout_mboxrd)
    rev.commit_format = CMIT_FMT_MBOXRD;

  if (use_stdout) {
    setup_pager();
  } else if (!rev.diffopt.close_file) {
    int saved;

    if (!output_directory)
      output_directory = cfg.config_output_directory;
    output_directory = set_outdir(prefix, output_directory);

    if (rev.diffopt.use_color != GIT_COLOR_ALWAYS)
      rev.diffopt.use_color = GIT_COLOR_NEVER;
    /*
     * We consider <outdir> as 'outside of gitdir', therefore avoid
     * applying adjust_shared_perm in s-c-l-d.
     */
    saved = get_shared_repository();
    set_shared_repository(0);
    switch (safe_create_leading_directories_const(output_directory)) {
    case SCLD_OK:
    case SCLD_EXISTS:
      break;
    default:
      die(_("could not create leading directories "
            "of '%s'"), output_directory);
    }
    set_shared_repository(saved);
    if (mkdir(output_directory, 0777) < 0 && errno != EEXIST)
      die_errno(_("could not create directory '%s'"),
          output_directory);
  }

  if (rev.pending.nr == 1) {
    int check_head = 0;

    if (rev.max_count < 0 && !rev.show_root_diff) {
      /*
       * This is traditional behaviour of "git format-patch
       * origin" that prepares what the origin side still
       * does not have.
       */
      rev.pending.objects[0].item->flags |= UNINTERESTING;
      add_head_to_pending(&rev);
      check_head = 1;
    }
    /*
     * Otherwise, it is "format-patch -22 HEAD", and/or
     * "format-patch --root HEAD".  The user wants
     * get_revision() to do the usual traversal.
     */

    if (!strcmp(rev.pending.objects[0].name, "HEAD"))
      check_head = 1;

    if (check_head) {
      const char *ref, *v;
      ref = refs_resolve_ref_unsafe(get_main_ref_store(the_repository),
                  "HEAD",
                  RESOLVE_REF_READING,
                  NULL, NULL);
      if (ref && skip_prefix(ref, "refs/heads/", &v))
        branch_name = xstrdup(v);
      else
        branch_name = xstrdup(""); /* no branch */
    }
  }

  /*
   * We cannot move this anywhere earlier because we do want to
   * know if --root was given explicitly from the command line.
   */
  rev.show_root_diff = 1;

  if (ignore_if_in_upstream) {
    /* Don't say anything if head and upstream are the same. */
    if (rev.pending.nr == 2) {
      struct object_array_entry *o = rev.pending.objects;
      if (oideq(&o[0].item->oid, &o[1].item->oid))
        goto done;
    }
    get_patch_ids(&rev, &ids);
  }

  if (prepare_revision_walk(&rev))
    die(_("revision walk setup failed"));
  rev.boundary = 1;
  while ((commit = get_revision(&rev)) != NULL) {
    if (commit->object.flags & BOUNDARY) {
      boundary_count++;
      origin = (boundary_count == 1) ? commit : NULL;
      continue;
    }

    if (ignore_if_in_upstream && has_commit_patch_id(commit, &ids))
      continue;

    nr++;
    REALLOC_ARRAY(list, nr);
    list[nr - 1] = commit;
  }
  if (nr == 0)
    /* nothing to do */
    goto done;
  total = nr;
  if (cover_letter == -1) {
    if (cfg.config_cover_letter == COVER_AUTO)
      cover_letter = (total > 1);
    else if ((idiff_prev.nr || rdiff_prev) && (total > 1))
      cover_letter = (cfg.config_cover_letter != COVER_OFF);
    else
      cover_letter = (cfg.config_cover_letter == COVER_ON);
  }
  if (!cfg.keep_subject && cfg.auto_number && (total > 1 || cover_letter))
    cfg.numbered = 1;
  if (cfg.numbered)
    rev.total = total + start_number - 1;

  if (idiff_prev.nr) {
    if (!cover_letter && total != 1)
      die(_("--interdiff requires --cover-letter or single patch"));
    rev.idiff_oid1 = &idiff_prev.oid[idiff_prev.nr - 1];
    rev.idiff_oid2 = get_commit_tree_oid(list[0]);
    rev.idiff_title = diff_title(&idiff_title, reroll_count,
               _("Interdiff:"),
               _("Interdiff against v%d:"));
  }

  if (creation_factor < 0)
    creation_factor = CREATION_FACTOR_FOR_THE_SAME_SERIES;
  else if (!rdiff_prev)
    die(_("the option '%s' requires '%s'"), "--creation-factor", "--range-diff");

  if (rdiff_prev) {
    if (!cover_letter && total != 1)
      die(_("--range-diff requires --cover-letter or single patch"));

    infer_range_diff_ranges(&rdiff1, &rdiff2, rdiff_prev,
          origin, list[0]);
    rev.rdiff1 = rdiff1.buf;
    rev.rdiff2 = rdiff2.buf;
    rev.creation_factor = creation_factor;
    rev.rdiff_title = diff_title(&rdiff_title, reroll_count,
               _("Range-diff:"),
               _("Range-diff against v%d:"));
  }

  /*
   * The order of precedence is:
   *
   *   1. The `--signature` and `--no-signature` options.
   *   2. The `--signature-file` option.
   *   3. The `format.signature` config.
   *   4. The `format.signatureFile` config.
   *   5. Default `git_version_string`.
   */
  if (!signature) {
    ; /* --no-signature inhibits all signatures */
  } else if (signature && signature != git_version_string) {
    ; /* non-default signature already set */
  } else if (signature_file_arg || (cfg.signature_file && !cfg.signature)) {
    struct strbuf buf = STRBUF_INIT;
    const char *signature_file = signature_file_arg ?
      signature_file_arg : cfg.signature_file;

    if (strbuf_read_file(&buf, signature_file, 128) < 0)
      die_errno(_("unable to read signature file '%s'"), signature_file);
    signature = signature_to_free = strbuf_detach(&buf, NULL);
  } else if (cfg.signature) {
    signature = cfg.signature;
  }

  memset(&bases, 0, sizeof(bases));
  base = get_base_commit(&cfg, list, nr);
  if (base) {
    reset_revision_walk();
    clear_object_flags(UNINTERESTING);
    prepare_bases(&bases, base, list, nr);
  }

  if (in_reply_to || cfg.thread || cover_letter) {
    rev.ref_message_ids = xmalloc(sizeof(*rev.ref_message_ids));
    string_list_init_dup(rev.ref_message_ids);
  }
  if (in_reply_to) {
    char *msgid = clean_message_id(in_reply_to);
    string_list_append_nodup(rev.ref_message_ids, msgid);
  }
  rev.numbered_files = just_numbers;
  rev.patch_suffix = fmt_patch_suffix;
  if (cover_letter) {
    if (cfg.thread)
      gen_message_id(&rev, "cover");
    make_cover_letter(&rev, !!output_directory,
          origin, nr, list, description_file, branch_name, quiet, &cfg);
    print_bases(&bases, rev.diffopt.file);
    print_signature(signature, rev.diffopt.file);
    total++;
    start_number--;
    /* interdiff/range-diff in cover-letter; omit from patches */
    rev.idiff_oid1 = NULL;
    rev.rdiff1 = NULL;
  }
  rev.add_signoff = cfg.do_signoff;

  if (show_progress)
    progress = start_delayed_progress(_("Generating patches"), total);
  while (0 <= --nr) {
    int shown;
    display_progress(progress, total - nr);
    commit = list[nr];
    rev.nr = total - nr + (start_number - 1);
    /* Make the second and subsequent mails replies to the first */
    if (cfg.thread) {
      /* Have we already had a message ID? */
      if (rev.message_id) {
        /*
         * For deep threading: make every mail
         * a reply to the previous one, no
         * matter what other options are set.
         *
         * For shallow threading:
         *
         * Without --cover-letter and
         * --in-reply-to, make every mail a
         * reply to the one before.
         *
         * With --in-reply-to but no
         * --cover-letter, make every mail a
         * reply to the <reply-to>.
         *
         * With --cover-letter, make every
         * mail but the cover letter a reply
         * to the cover letter.  The cover
         * letter is a reply to the
         * --in-reply-to, if specified.
         */
        if (cfg.thread == THREAD_SHALLOW
            && rev.ref_message_ids->nr > 0
            && (!cover_letter || rev.nr > 1))
          free(rev.message_id);
        else
          string_list_append_nodup(rev.ref_message_ids,
                 rev.message_id);
      }
      gen_message_id(&rev, oid_to_hex(&commit->object.oid));
    }

    if (output_directory &&
        open_next_file(rev.numbered_files ? NULL : commit, NULL, &rev, quiet))
      die(_("failed to create output files"));
    shown = log_tree_commit(&rev, commit);
    free_commit_buffer(the_repository->parsed_objects,
           commit);

    /* We put one extra blank line between formatted
     * patches and this flag is used by log-tree code
     * to see if it needs to emit a LF before showing
     * the log; when using one file per patch, we do
     * not want the extra blank line.
     */
    if (output_directory)
      rev.shown_one = 0;
    if (shown) {
      print_bases(&bases, rev.diffopt.file);
      if (rev.mime_boundary)
        fprintf(rev.diffopt.file, "\n--%s%s--\n\n\n",
               mime_boundary_leader,
               rev.mime_boundary);
      else
        print_signature(signature, rev.diffopt.file);
    }
    if (output_directory) {
      fclose(rev.diffopt.file);
      rev.diffopt.file = NULL;
    }
  }
  stop_progress(&progress);
  free(list);
  if (ignore_if_in_upstream)
    free_patch_ids(&ids);

done:
  oid_array_clear(&idiff_prev);
  strbuf_release(&idiff_title);
  strbuf_release(&rdiff1);
  strbuf_release(&rdiff2);
  strbuf_release(&rdiff_title);
  free(description_file);
  free(signature_file_arg);
  free(signature_to_free);
  free(branch_name);
  free(to_free);
  free(rev.message_id);
  if (rev.ref_message_ids)
    string_list_clear(rev.ref_message_ids, 0);
  free(rev.ref_message_ids);
  rev.diffopt.no_free = 0;
  release_revisions(&rev);
  format_config_release(&cfg);
  return 0;
}

static int add_pending_commit(const char *arg, struct rev_info *revs, int flags)
{
  struct object_id oid;
  if (repo_get_oid(the_repository, arg, &oid) == 0) {
    struct commit *commit = lookup_commit_reference(the_repository,
                &oid);
    if (commit) {
      commit->object.flags |= flags;
      add_pending_object(revs, &commit->object, arg);
      return 0;
    }
  }
  return -1;
}

static const char * const cherry_usage[] = {
  N_("git cherry [-v] [<upstream> [<head> [<limit>]]]"),
  NULL
};

static void print_commit(char sign, struct commit *commit, int verbose,
       int abbrev, FILE *file)
{
  if (!verbose) {
    fprintf(file, "%c %s\n", sign,
           repo_find_unique_abbrev(the_repository, &commit->object.oid, abbrev));
  } else {
    struct strbuf buf = STRBUF_INIT;
    pp_commit_easy(CMIT_FMT_ONELINE, commit, &buf);
    fprintf(file, "%c %s %s\n", sign,
           repo_find_unique_abbrev(the_repository, &commit->object.oid, abbrev),
           buf.buf);
    strbuf_release(&buf);
  }
}

int cmd_cherry(int argc, const char **argv, const char *prefix)
{
  struct rev_info revs;
  struct patch_ids ids;
  struct commit *commit;
  struct commit_list *list = NULL;
  struct branch *current_branch;
  const char *upstream;
  const char *head = "HEAD";
  const char *limit = NULL;
  int verbose = 0, abbrev = 0;

  struct option options[] = {
    OPT__ABBREV(&abbrev),
    OPT__VERBOSE(&verbose, N_("be verbose")),
    OPT_END()
  };

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

  switch (argc) {
  case 3:
    limit = argv[2];
    /* FALLTHROUGH */
  case 2:
    head = argv[1];
    /* FALLTHROUGH */
  case 1:
    upstream = argv[0];
    break;
  default:
    current_branch = branch_get(NULL);
    upstream = branch_get_upstream(current_branch, NULL);
    if (!upstream) {
      fprintf(stderr, _("Could not find a tracked"
          " remote branch, please"
          " specify <upstream> manually.\n"));
      usage_with_options(cherry_usage, options);
    }
  }

  repo_init_revisions(the_repository, &revs, prefix);
  revs.max_parents = 1;

  if (add_pending_commit(head, &revs, 0))
    die(_("unknown commit %s"), head);
  if (add_pending_commit(upstream, &revs, UNINTERESTING))
    die(_("unknown commit %s"), upstream);

  /* Don't say anything if head and upstream are the same. */
  if (revs.pending.nr == 2) {
    struct object_array_entry *o = revs.pending.objects;
    if (oideq(&o[0].item->oid, &o[1].item->oid))
      return 0;
  }

  get_patch_ids(&revs, &ids);

  if (limit && add_pending_commit(limit, &revs, UNINTERESTING))
    die(_("unknown commit %s"), limit);

  /* reverse the list of commits */
  if (prepare_revision_walk(&revs))
    die(_("revision walk setup failed"));
  while ((commit = get_revision(&revs)) != NULL) {
    commit_list_insert(commit, &list);
  }

  for (struct commit_list *l = list; l; l = l->next) {
    char sign = '+';

    commit = l->item;
    if (has_commit_patch_id(commit, &ids))
      sign = '-';
    print_commit(sign, commit, verbose, abbrev, revs.diffopt.file);
  }

  free_commit_list(list);
  free_patch_ids(&ids);
  return 0;
}

Coverage Report

Created: 2024-09-16 06:12