#define USE_THE_REPOSITORY_VARIABLE

#include "git-compat-util.h"

#include "commit.h"

#include "editor.h"

#include "environment.h"

#include "gettext.h"

#include "sequencer.h"

#include "rebase-interactive.h"

#include "repository.h"

#include "strbuf.h"

#include "commit-slab.h"

#include "config.h"

#include "dir.h"

#include "object-name.h"

static const char edit_todo_list_advice[] =

N_("You can fix this with 'git rebase --edit-todo' "

"and then run 'git rebase --continue'.\n"

"Or you can abort the rebase with 'git rebase"

" --abort'.\n");

enum missing_commit_check_level {

  MISSING_COMMIT_CHECK_IGNORE = 0,

  MISSING_COMMIT_CHECK_WARN,

  MISSING_COMMIT_CHECK_ERROR

};

static enum missing_commit_check_level get_missing_commit_check_level(void)

{

  const char *value;

  if (git_config_get_value("rebase.missingcommitscheck", &value) ||

      !strcasecmp("ignore", value))

    return MISSING_COMMIT_CHECK_IGNORE;

  if (!strcasecmp("warn", value))

    return MISSING_COMMIT_CHECK_WARN;

  if (!strcasecmp("error", value))

    return MISSING_COMMIT_CHECK_ERROR;

  warning(_("unrecognized setting %s for option "

      "rebase.missingCommitsCheck. Ignoring."), value);

  return MISSING_COMMIT_CHECK_IGNORE;

}

void append_todo_help(int command_count,

          const char *shortrevisions, const char *shortonto,

          struct strbuf *buf)

{

  const char *msg = _("\nCommands:\n"

"p, pick <commit> = use commit\n"

"r, reword <commit> = use commit, but edit the commit message\n"

"e, edit <commit> = use commit, but stop for amending\n"

"s, squash <commit> = use commit, but meld into previous commit\n"

"f, fixup [-C | -c] <commit> = like \"squash\" but keep only the previous\n"

"                   commit's log message, unless -C is used, in which case\n"

"                   keep only this commit's message; -c is same as -C but\n"

"                   opens the editor\n"

"x, exec <command> = run command (the rest of the line) using shell\n"

"b, break = stop here (continue rebase later with 'git rebase --continue')\n"

"d, drop <commit> = remove commit\n"

"l, label <label> = label current HEAD with a name\n"

"t, reset <label> = reset HEAD to a label\n"

"m, merge [-C <commit> | -c <commit>] <label> [# <oneline>]\n"

"        create a merge commit using the original merge commit's\n"

"        message (or the oneline, if no original merge commit was\n"

"        specified); use -c <commit> to reword the commit message\n"

"u, update-ref <ref> = track a placeholder for the <ref> to be updated\n"

"                      to this position in the new commits. The <ref> is\n"

"                      updated at the end of the rebase\n"

"\n"

"These lines can be re-ordered; they are executed from top to bottom.\n");

  unsigned edit_todo = !(shortrevisions && shortonto);

  if (!edit_todo) {

    strbuf_addch(buf, '\n');

    strbuf_commented_addf(buf, comment_line_str,

              Q_("Rebase %s onto %s (%d command)",

           "Rebase %s onto %s (%d commands)",

           command_count),

              shortrevisions, shortonto, command_count);

  }

  strbuf_add_commented_lines(buf, msg, strlen(msg), comment_line_str);

  if (get_missing_commit_check_level() == MISSING_COMMIT_CHECK_ERROR)

    msg = _("\nDo not remove any line. Use 'drop' "

       "explicitly to remove a commit.\n");

  else

    msg = _("\nIf you remove a line here "

       "THAT COMMIT WILL BE LOST.\n");

  strbuf_add_commented_lines(buf, msg, strlen(msg), comment_line_str);

  if (edit_todo)

    msg = _("\nYou are editing the todo file "

      "of an ongoing interactive rebase.\n"

      "To continue rebase after editing, run:\n"

      "    git rebase --continue\n\n");

  else

    msg = _("\nHowever, if you remove everything, "

      "the rebase will be aborted.\n\n");

  strbuf_add_commented_lines(buf, msg, strlen(msg), comment_line_str);

}

int edit_todo_list(struct repository *r, struct replay_opts *opts,

       struct todo_list *todo_list, struct todo_list *new_todo,

       const char *shortrevisions, const char *shortonto,

       unsigned flags)

{

  const char *todo_file = rebase_path_todo(),

    *todo_backup = rebase_path_todo_backup();

  unsigned initial = shortrevisions && shortonto;

  int incorrect = 0;

  /* If the user is editing the todo list, we first try to parse

   * it.  If there is an error, we do not return, because the user

   * might want to fix it in the first place. */

  if (!initial)

    incorrect = todo_list_parse_insn_buffer(r, opts,

              todo_list->buf.buf,

              todo_list) |

      file_exists(rebase_path_dropped());

  if (todo_list_write_to_file(r, todo_list, todo_file, shortrevisions, shortonto,

            -1, flags | TODO_LIST_SHORTEN_IDS | TODO_LIST_APPEND_TODO_HELP))

    return error_errno(_("could not write '%s'"), todo_file);

  if (!incorrect &&

      todo_list_write_to_file(r, todo_list, todo_backup,

            shortrevisions, shortonto, -1,

            (flags | TODO_LIST_APPEND_TODO_HELP) & ~TODO_LIST_SHORTEN_IDS) < 0)

    return error(_("could not write '%s'."), rebase_path_todo_backup());

  if (launch_sequence_editor(todo_file, &new_todo->buf, NULL))

    return -2;

  strbuf_stripspace(&new_todo->buf, comment_line_str);

  if (initial && new_todo->buf.len == 0)

    return -3;

  if (todo_list_parse_insn_buffer(r, opts, new_todo->buf.buf, new_todo)) {

    fprintf(stderr, _(edit_todo_list_advice));

    return -4;

  }

  if (incorrect) {

    if (todo_list_check_against_backup(r, opts, new_todo)) {

      write_file(rebase_path_dropped(), "%s", "");

      return -4;

    }

    if (incorrect > 0)

      unlink(rebase_path_dropped());

  } else if (todo_list_check(todo_list, new_todo)) {

    write_file(rebase_path_dropped(), "%s", "");

    return -4;

  }

  /*

   * See if branches need to be added or removed from the update-refs

   * file based on the new todo list.

   */

  todo_list_filter_update_refs(r, new_todo);

  return 0;

}

define_commit_slab(commit_seen, unsigned char);

/*

 * Check if the user dropped some commits by mistake

 * Behaviour determined by rebase.missingCommitsCheck.

 * Check if there is an unrecognized command or a

 * bad SHA-1 in a command.

 */

int todo_list_check(struct todo_list *old_todo, struct todo_list *new_todo)

{

  enum missing_commit_check_level check_level = get_missing_commit_check_level();

  struct strbuf missing = STRBUF_INIT;

  int res = 0, i;

  struct commit_seen commit_seen;

  init_commit_seen(&commit_seen);

  if (check_level == MISSING_COMMIT_CHECK_IGNORE)

    goto leave_check;

  /* Mark the commits in git-rebase-todo as seen */

  for (i = 0; i < new_todo->nr; i++) {

    struct commit *commit = new_todo->items[i].commit;

    if (commit)

      *commit_seen_at(&commit_seen, commit) = 1;

  }

  /* Find commits in git-rebase-todo.backup yet unseen */

  for (i = old_todo->nr - 1; i >= 0; i--) {

    struct todo_item *item = old_todo->items + i;

    struct commit *commit = item->commit;

    if (commit && !*commit_seen_at(&commit_seen, commit)) {

      strbuf_addf(&missing, " - %s %.*s\n",

            repo_find_unique_abbrev(the_repository, &commit->object.oid, DEFAULT_ABBREV),

            item->arg_len,

            todo_item_get_arg(old_todo, item));

      *commit_seen_at(&commit_seen, commit) = 1;

    }

  }

  /* Warn about missing commits */

  if (!missing.len)

    goto leave_check;

  if (check_level == MISSING_COMMIT_CHECK_ERROR)

    res = 1;

  fprintf(stderr,

    _("Warning: some commits may have been dropped accidentally.\n"

    "Dropped commits (newer to older):\n"));

  /* Make the list user-friendly and display */

  fputs(missing.buf, stderr);

  strbuf_release(&missing);

  fprintf(stderr, _("To avoid this message, use \"drop\" to "

    "explicitly remove a commit.\n\n"

    "Use 'git config rebase.missingCommitsCheck' to change "

    "the level of warnings.\n"

    "The possible behaviours are: ignore, warn, error.\n\n"));

  fprintf(stderr, _(edit_todo_list_advice));

leave_check:

  clear_commit_seen(&commit_seen);

  return res;

}

int todo_list_check_against_backup(struct repository *r,

           struct replay_opts *opts,

           struct todo_list *todo_list)

{

  struct todo_list backup = TODO_LIST_INIT;

  int res = 0;

  if (strbuf_read_file(&backup.buf, rebase_path_todo_backup(), 0) > 0) {

    todo_list_parse_insn_buffer(r, opts, backup.buf.buf, &backup);

    res = todo_list_check(&backup, todo_list);

  }

  todo_list_release(&backup);

  return res;

}