/* Clean up working files.

   Copyright (C) 2010-2012 Thien-Thi Nguyen
   Copyright (C) 1991, 1992, 1993, 1994, 1995 Paul Eggert

   This file is part of GNU RCS.

   GNU RCS is free software: you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   GNU RCS is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty
   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   See the GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "base.h"
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <dirent.h>
#include "same-inode.h"
#include "rcsclean.help"
#include "b-complain.h"
#include "b-divvy.h"
#include "b-esds.h"
#include "b-excwho.h"
#include "b-fb.h"
#include "b-feph.h"
#include "b-fro.h"

struct top *top;

static struct fro *workptr;
static int exitstatus;

static void
cleanup (void)
{
  if (FLOW (erroneousp))
    exitstatus = EXIT_FAILURE;
  fro_zclose (&FLOW (from));
  fro_zclose (&workptr);
  Ozclose (&FLOW (res));
  ORCSclose ();
  dirtempunlink ();
}

static bool
unlock (struct delta *delta)
{
  struct link box, *tp;

  if (delta && delta->lockedby
      && caller_login_p (delta->lockedby)
      && (box.next = GROK (locks))
      && (tp = lock_delta_memq (&box, delta)))
    {
      lock_drop (&box, tp);
      return true;
    }
  return false;
}

static int
get_directory (char const *dirname, char ***aargv)
/* Put a vector of all DIRNAME's directory entries names into *AARGV.
   Ignore names of RCS files.
   Return the number of entries found.  Terminate the vector with 0.
   Allocate the storage for the vector and entry names.
   Do not sort the names.  Do not include '.' and '..'.  */
{
  DIR *d;
  struct dirent *e;
  struct divvy *justme = make_space ("justme");
  size_t i, entries = 0;
  struct wlink head, *tp;

  if (!(d = opendir (dirname)))
    fatal_sys (dirname);
  head.next = NULL;
  tp = &head;
  while ((errno = 0, e = readdir (d)))
    {
      char const *en = e->d_name;

      if (en[0] == '.' && (!en[1] || (en[1] == '.' && !en[2])))
        continue;
      if (rcssuffix (en))
        continue;
      tp = wextend (tp, str_save (en), justme);
      entries++;
    }
  if (errno || PROB (closedir (d)))
    fatal_sys (dirname);
  *aargv = pointer_array (PLEXUS, entries);
  for (tp = head.next, i = 0; i < entries; tp = tp->next, i++)
    (*aargv)[i] = tp->entry;
  close_space (justme);
  return entries;
}

int
main (int argc, char **argv)
{
  char *a, **newargv;
  char const *rev, *p;
  bool dounlock, perform, unlocked, unlockflag, waslocked, Ttimeflag;
  int expmode;
  struct wlink *deltas;
  struct delta *delta;
  struct stat workstat;
  const struct program program =
    {
      .invoke = argv[0],
      .name = "rcsclean",
      .help = rcsclean_help,
      .tyag = BOG_FULL
    };

  CHECK_HV ();
  gnurcs_init (&program);

  setrid ();

  expmode = -1;
  rev = NULL;
  BE (pe) = X_DEFAULT;
  perform = true;
  unlockflag = false;
  Ttimeflag = false;

  argc = getRCSINIT (argc, argv, &newargv);
  argv = newargv;
  for (;;)
    {
      if (--argc < 1)
        {
          argc = get_directory (".", &newargv);
          argv = newargv;
          break;
        }
      a = *++argv;
      if (!*a || *a++ != '-')
        break;
      switch (*a++)
        {
        case 'k':
          if (0 <= expmode)
            redefined ('k');
          if (PROB (expmode = str2expmode (a)))
            goto unknown;
          break;

        case 'n':
          perform = false;
          goto handle_revision;

        case 'q':
          BE (quiet) = true;
          /* fall into */
        case 'r':
        handle_revision:
          if (*a)
            {
              if (rev)
                PWARN ("redefinition of %s", ks_revno);
              rev = a;
            }
          break;

        case 'T':
          if (*a)
            goto unknown;
          Ttimeflag = true;
          break;

        case 'u':
          unlockflag = true;
          goto handle_revision;

        case 'V':
          setRCSversion (*argv);
          break;

        case 'x':
          BE (pe) = a;
          break;

        case 'z':
          zone_set (a);
          break;

        default:
        unknown:
          bad_option (*argv);
        }
    }

  dounlock = perform & unlockflag;

  if (FLOW (erroneousp))
    cleanup ();
  else
    for (; 0 < argc; cleanup (), ++argv, --argc)
      {
        struct stat *repo_stat;
        char const *mani_filename;

        ffree ();

        if (!(0 < pairnames (argc, argv,
                             dounlock ? rcswriteopen : rcsreadopen,
                             true, true)
              && (mani_filename = MANI (filename))
              && (workptr = fro_open (mani_filename, FOPEN_R_WORK, &workstat))))
          continue;
        repo_stat = &REPO (stat);

        if (SAME_INODE (REPO (stat), workstat))
          {
            RERR ("RCS file is the same as working file %s.", mani_filename);
            continue;
          }

        p = NULL;
        if (rev)
          {
            struct cbuf numeric;

            if (!fully_numeric (&numeric, rev, workptr))
              continue;
            p = numeric.string;
          }
        else if (REPO (tip))
          switch (unlockflag ? findlock (false, &delta) : 0)
            {
            default:
              continue;
            case 0:
              p = GROK (branch) ? GROK (branch) : "";
              break;
            case 1:
              p = delta->num;
              break;
            }
        delta = NULL;
        deltas = NULL;                  /* Keep lint happy.  */
        if (p && !(delta = gr_revno (p, &deltas)))
          continue;

        waslocked = delta && delta->lockedby;
        BE (inclusive_of_Locker_in_Id_val) = unlock (delta);
        unlocked = BE (inclusive_of_Locker_in_Id_val) & unlockflag;
        if (unlocked < waslocked
            && workstat.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH))
          continue;

        if (unlocked && !checkaccesslist ())
          continue;

        if (PROB (dorewrite (dounlock, unlocked)))
          continue;

        if (0 <= expmode)
          BE (kws) = expmode;
        else if (waslocked
                 && BE (kws) == kwsub_kv
                 && WORKMODE (repo_stat->st_mode, true) == workstat.st_mode)
          BE (kws) = kwsub_kvl;

        write_desc_maybe (FLOW (to));

        if (!delta
            ? workstat.st_size != 0
            : 0 < rcsfcmp (workptr, &workstat,
                           buildrevision (deltas, delta, NULL, false),
                           delta))
          continue;

        if (BE (quiet) < unlocked)
          aprintf (stdout, "rcs -u%s %s\n", delta->num, REPO (filename));

        if (perform & unlocked)
          {
            struct fro *from = FLOW (from);

            SAME_AFTER (from, delta->text);
            if (deltas->entry != delta)
              fro_trundling (true, from);
            if (PROB (donerewrite (true, Ttimeflag
                                   ? repo_stat->st_mtime
                                   : (time_t) - 1)))
              continue;
          }

        if (!BE (quiet))
          aprintf (stdout, "rm -f %s\n", mani_filename);
        fro_zclose (&workptr);
        if (perform && PROB (un_link (mani_filename)))
          syserror_errno (mani_filename);
      }

  tempunlink ();
  if (!BE (quiet))
    fclose (stdout);
  gnurcs_goodbye ();
  return exitstatus;
}

/*:help
[options] file ...
Options:
  -r[REV]       Specify revision.
  -u[REV]       Unlock if is locked and no differences found.
  -n[REV]       Dry run (no act, don't operate).
  -q[REV]       Quiet mode.
  -kSUBST       Substitute using mode SUBST (see co(1)).
  -T            Preserve the modification time on the RCS file
                even if it changes because a lock is removed.
  -V            Like --version.
  -VN           Emulate RCS version N.
  -xSUFF        Specify SUFF as a slash-separated list of suffixes
                used to identify RCS file names.
  -zZONE        Specify date output format in keyword-substitution.

REV defaults to the latest revision on the default branch.
*/

/* rcsclean.c ends here */