/* undo-changes.c
 *
 ****************************************************************
 * Copyright (C) 2003 Tom Lord
 * 
 * See the file "COPYING" for further information about
 * the copyright and warranty status of this work.
 */


#include "config-options.h"
#include "hackerlab/cmd/main.h"
#include "hackerlab/fs/file-names.h"
#include "file-utils/libfsutils/rmrf.h"
#include "file-utils/libarch/namespace.h"
#include "file-utils/libarch/project-tree.h"
#include "file-utils/libarch/patch-logs.h"
#include "file-utils/libarch/local-cache.h"
#include "file-utils/libarch/proj-tree-lint.h"
#include "file-utils/libarch/undo.h"


/* __STDC__ prototypes for static functions */


static t_uchar * program_name = "undo-changes";
static t_uchar * usage = "[options] [revision]";
static t_uchar * version_string = (cfg__std__package " from regexps.com\n"
				   "\n"
				   "Copyright 2003 Tom Lord\n"
				   "\n"
				   "This is free software; see the source for copying conditions.\n"
				   "There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A\n"
				   "PARTICULAR PURPOSE.\n"
				   "\n"
				   "Report bugs to " cfg__file_utils_bug_mail ".\n"
				   "\n");

#define OPTS(OP, OP2) \
  OP (opt_help_msg, "h", "help", 0, \
      "Display a help message and exit.") \
  OP (opt_long_help, "H", 0, 0, \
      "Display a verbose help message and exit.") \
  OP (opt_version, "V", "version", 0, \
      "Display a release identifier string") \
  OP2 (opt_version, 0, 0, 0, "and exit.") \
  OP (opt_archive, "A", "archive", 1, \
      "specify a default archive name") \
  OP (opt_dir, "d", "dir DIR", 1, \
      "cd to DIR first") \
  OP (opt_output_dir, "o", "output DIR", 1, \
      "save changeset in DIR") \
  OP (opt_quiet, "q", "quiet", 0, \
      "no progress reports while computing changeset")

static t_uchar long_help[] = ("compare a project tree to a pristine or library revision\n");

enum options
{
  OPTS (OPT_ENUM, OPT_IGN)  
};

struct opt_desc opts[] = 
{
  OPTS (OPT_DESC, OPT_DESC)
    {-1, 0, 0, 0, 0}
};



int
main (int argc, char * argv[])
{
  int o;
  struct opt_parsed * option;
  t_uchar * dir = 0;
  t_uchar * output = 0;
  t_uchar * default_archive = 0;
  int quiet = 0;

  dir = str_save (0, ".");

  safe_buffer_fd (1, 0, O_WRONLY, 0);

  option = 0;

  while (1)
    {
      o = opt_standard (lim_use_must_malloc, &option, opts, &argc, argv, program_name, usage, version_string, long_help, opt_help_msg, opt_long_help, opt_version);
      if (o == opt_none)
	break;
      switch (o)
	{
	default:
	  safe_printfmt (2, "unhandled option `%s'\n", option->opt_string);
	  panic ("internal error parsing arguments");

	usage_error:
	  opt_usage (2, argv[0], program_name, usage, 1);
	  exit (1);

          /* bogus_arg: */
	  safe_printfmt (2, "ill-formed argument for `%s' (`%s')\n", option->opt_string, option->arg_string);
	  goto usage_error;


        case opt_archive:
          {
            lim_free (0, default_archive);
            default_archive = str_save (0, option->arg_string);
            break;
          }

        case opt_dir:
          {
            lim_free (0, dir);
            dir = str_save (0, option->arg_string);
            break;
          }

        case opt_output_dir:
          {
            lim_free (0, output);
            output = str_save (0, option->arg_string);
            break;
          }

        case opt_quiet:
          {
            quiet = 1;
            break;
          }
	}
    }

  if (argc > 2)
    goto usage_error;

  {
    t_uchar * tree_root = 0;
    t_uchar * rvsnspec = 0;
    t_uchar * archive = 0;
    t_uchar * revision = 0;

    if (default_archive && !arch_valid_archive_name (default_archive))
      {
        safe_printfmt (2, "undo-changes: invalid archive name: %s\n", default_archive);
        exit (2);
      }

    tree_root = arch_tree_root (0, dir, 0);

    if (!tree_root)
      {
        safe_printfmt (2, "undo-changes: not in a project tree\n  dir: %s\n", dir);
        exit (2);
      }

    if (argc == 2)
      rvsnspec = str_save (0, argv[1]);
    else
      {
        t_uchar * fqvsn = 0;
        t_uchar * tree_arch = 0;
        t_uchar * tree_version = 0;
        t_uchar * latest_log = 0;

        fqvsn = arch_tree_version (tree_root);
        if (!fqvsn)
          {
            safe_printfmt (2, "undo-changes: no tree-version set\n  tree: %s\n", tree_root);
            exit (2);
          }

        tree_arch = arch_parse_package_name (arch_ret_archive, 0, fqvsn);
        tree_version = arch_parse_package_name (arch_ret_non_archive, 0, fqvsn);

        invariant (!!tree_arch);
        invariant (arch_valid_package_name (tree_version, arch_no_archive, arch_req_version, 0));

        latest_log = arch_highest_patch_level (tree_root, tree_arch, tree_version);

        rvsnspec = str_alloc_cat_many (0, fqvsn, "--", latest_log, str_end);

        lim_free (0, fqvsn);
        lim_free (0, tree_arch);
        lim_free (0, tree_version);
        lim_free (0, latest_log);
      }

    if (!arch_valid_package_name (rvsnspec, arch_maybe_archive, arch_req_patch_level, 0))
      {
        safe_printfmt (2, "undo-changes: illegal revision name: %s\n", rvsnspec);
        exit (2);
      }

    archive = arch_parse_package_name (arch_ret_archive, default_archive, rvsnspec);
    revision = arch_parse_package_name (arch_ret_non_archive, 0, rvsnspec);

    if (!output)
      {
        output = arch_next_undo_changeset (0, tree_root);
      }


    {
      struct arch_tree_lint_result * lint = 0;

      if (!quiet)
        safe_printfmt (1, "* linting the source tree\n");
      lint = arch_tree_lint (tree_root);
      if (arch_print_tree_lint_report ((quiet ? 2 : 1), lint))
        {
          exit (1);
        }
    }

    {
      t_uchar * orig_tree = 0;

      orig_tree = arch_find_local_copy (tree_root, archive, revision);

      if (!orig_tree)
        {
          safe_printfmt (2, "what-changed: no local copies to compare to (%s/%s)\n  consider `add-prisitine --help'\n", archive, revision);
          exit (2);
        }


      arch_undo ((quiet ? -1 : 1), output, tree_root, orig_tree);

      lim_free (0, orig_tree);
    }


    lim_free (0, rvsnspec);
    lim_free (0, tree_root);
    lim_free (0, archive);
    lim_free (0, revision);
  }


  lim_free (0, dir);
  lim_free (0, output);
  lim_free (0, default_archive);

  return 0;
}



/* tag: Tom Lord Thu May 29 16:01:27 2003 (undo-changes.c)
 */
