Fossil

/*
** Copyright (c) 2014 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)

** This program 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.
**
** Author contact information:
**   drh@hwaci.com
**   http://www.hwaci.com/drh/

** COMMAND: purge*
**
** The purge command removes content from a repository and stores that content
** in a "graveyard".  The graveyard exists so that content can be recovered
** using the "fossil purge undo" command.  The "fossil purge obliterate"
** command empties the graveyard, making the content unrecoverable.
**
** ==== WARNING: This command can potentially destroy historical data and ====
** ==== leave your repository in a goofy state. Know what you are doing!  ====
** ==== Make a backup of your repository before using this command!       ====
**
** ==== FURTHER WARNING: This command is a work-in-progress and may yet   ====
** ==== contain bugs.                                                     ====
**
**   fossil purge artifacts HASH... ?OPTIONS?
**
**      Move arbitrary artifacts identified by the HASH list into the
**      graveyard.
**
**   fossil purge cat HASH...
**
**      Write the content of one or more artifacts in the graveyard onto
**      standard output.
**
**   fossil purge checkins TAGS... ?OPTIONS?
**
**      Move the check-ins or branches identified by TAGS and all of
**      their descendants out of the repository and into the graveyard.
**      If TAGS includes a branch name then it means all the check-ins
**      on the most recent occurrence of that branch.
**
**   fossil purge files NAME ... ?OPTIONS?
**
**      Move all instances of files called NAME into the graveyard.
**      NAME should be the name of the file relative to the root of the
**      repository.  If NAME is a directory, then all files within that
**      directory are moved.
**
**   fossil purge list|ls ?-l?
**
**      Show the graveyard of prior purges.  The -l option gives more
**      detail in the output.
**
**   fossil purge obliterate ID... ?--force?
**
**      Remove one or more purge events from the graveyard.  Once a purge
**      event is obliterated, it can no longer be undone.  The --force
**      option suppresses the confirmation prompt.
**
**   fossil purge tickets NAME ... ?OPTIONS?
**
**      TBD...
**
**   fossil purge undo ID
**
**      Restore the content previously removed by purge ID.
**
**   fossil purge wiki NAME ... ?OPTIONS?
**
**      TBD...
**
** COMMON OPTIONS:
**
**   --explain         Make no changes, but show what would happen.
**   --dry-run         An alias for --explain
**
** SUMMARY:
**   fossil purge artifacts HASH.. [OPTIONS]
**   fossil purge cat HASH...
**   fossil purge checkins TAGS... [OPTIONS]
**   fossil purge files FILENAME... [OPTIONS]
**   fossil purge list
**   fossil purge obliterate ID...
**   fossil purge tickets NAME... [OPTIONS]
**   fossil purge undo ID
**   fossil purge wiki NAME... [OPTIONS]
*/
void purge_cmd(void){
  int purgeFlags = PURGE_MOVETO_GRAVEYARD | PURGE_PRINT_SUMMARY;
  const char *zSubcmd;
  int n;
  int i;
  Stmt q;