Fossil

** It prints out what would have happened but does not actually make
** any changes to the current checkout or the repository.
**
** The -v or --verbose option prints status information about
** unchanged files in addition to those file that actually do change.
**
** Options:
**   --case-sensitive BOOL   Override case-sensitive setting
**   --debug                 Print debug information on stdout
**   -n|--dry-run            If given, display instead of run actions

**   --force-missing         Force update if missing content after sync
**   -K|--keep-merge-files   On merge conflict, retain the temporary files
**                           used for merging, named *-baseline, *-original,


**                           and *-merge.
**   --latest                Acceptable in place of VERSION, update to
**                           latest version
**   --nosync                Do not auto-sync prior to update
**   --setmtime              Set timestamps of all files to match their
**                           SCM-side times (the timestamp of the last
**                           checkin which modified them).
**   -v|--verbose            Print status information about all files
**   -W|--width WIDTH        Width of lines (default is to auto-detect).
**                           Must be more than 20 or 0 (= no limit,
**                           resulting in a single line per entry).
**
** See also: [[revert]]
*/
void update_cmd(void){
  int vid;              /* Current version */
  int tid=0;            /* Target version - version we are changing to */
  Stmt q;
  int latestFlag;       /* --latest.  Pick the latest version if true */
  int dryRunFlag;       /* -n or --dry-run.  Do a dry run */
  int verboseFlag;      /* -v or --verbose.  Output extra information */
  int forceMissingFlag; /* --force-missing.  Continue if missing content */
  int debugFlag;        /* --debug option */
  int setmtimeFlag;     /* --setmtime.  Set mtimes on files */
  int keepMergeFlag;    /* True if --keep-merge-files is present */
  int nChng;            /* Number of file renames */
  int *aChng;           /* Array of file renames */
  int i;                /* Loop counter */
  int nConflict = 0;    /* Number of merge conflicts */
  int nOverwrite = 0;   /* Number of unmanaged files overwritten */
  int nUpdate = 0;      /* Number of changes of any kind */
  int bNosync = 0;      /* --nosync.  Omit the auto-sync */
  int width;            /* Width of printed comment lines */
  Stmt mtimeXfer;       /* Statement to transfer mtimes */
  const char *zWidth;   /* Width option string value */

  if( !internalUpdate ){
    undo_capture_command_line();
    url_proxy_options();

    dryRunFlag = find_option("nochange",0,0)!=0; /* deprecated */
  }
  verboseFlag = find_option("verbose","v",0)!=0;
  forceMissingFlag = find_option("force-missing",0,0)!=0;
  debugFlag = find_option("debug",0,0)!=0;
  setmtimeFlag = find_option("setmtime",0,0)!=0;
  keepMergeFlag = find_option("keep-merge-files", "K",0)!=0;
  bNosync = find_option("nosync",0,0)!=0;

  /* We should be done with options.. */
  verify_all_options();

  db_must_be_within_tree();
  vid = db_lget_int("checkout", 0);
  user_select();
  if( !dryRunFlag && !internalUpdate && !bNosync ){
    if( autosync_loop(SYNC_PULL + SYNC_VERBOSE*verboseFlag,
                      db_get_int("autosync-tries", 1), 1) ){
      fossil_fatal("update abandoned due to sync failure");
    }
  }

  /* Create any empty directories now, as well as after the update,