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  /**
     JSON construction callback. Creates the contents for the
     payload.artifact property of /json/artifact responses.
  */
  artifact_f func;
} ArtifactDispatchEntry;


/*
** Generates a JSON Array reference holding the parent UUIDs (as strings).
** If it finds no matches then it returns NULL (OOM is a fatal error).
**
** Returned value is NULL or an Array owned by the caller.
*/
cson_value * json_parent_uuids_for_ci( int rid ){
  Stmt q = empty_Stmt;
  cson_array * pParents = NULL;
  db_prepare( &q,
              "SELECT uuid FROM plink, blob"
              " WHERE plink.cid=%d AND blob.rid=plink.pid"
              " ORDER BY plink.isprim DESC",
              rid );
  while( SQLITE_ROW==db_step(&q) ){
    if(!pParents) {
      pParents = cson_new_array();
    }
    cson_array_append( pParents, cson_sqlite3_column_to_value( q.pStmt, 0 ) );
  }
  db_finalize(&q);
  return cson_array_value(pParents);
}

/*
** Generates an artifact Object for the given rid,
** which must refer to a Checkin.
**
** Returned value is NULL or an Object owned by the caller.
*/
cson_value * json_artifact_for_ci( int rid, char showFiles ){
  char * zParent = NULL;
  cson_value * v = NULL;
  Stmt q;
  static cson_value * eventTypeLabel = NULL;
  if(!eventTypeLabel){
    eventTypeLabel = json_new_string("checkin");
    json_gc_add("$EVENT_TYPE_LABEL(commit)", eventTypeLabel);
  }
  zParent = db_text(0,
    "SELECT uuid FROM plink, blob"
    " WHERE plink.cid=%d AND blob.rid=plink.pid AND plink.isprim",
    rid
  );

  db_prepare(&q, 
             "SELECT uuid, "
             " cast(strftime('%%s',mtime) as int), "
             " user, "
             " comment,"
             " strftime('%%s',omtime)"
             " FROM blob, event"
             " WHERE blob.rid=%d"
             "   AND event.objid=%d",
             rid, rid
             );
  if( db_step(&q)==SQLITE_ROW ){
    cson_object * o;
    cson_value * tmpV = NULL;
    const char *zUuid = db_column_text(&q, 0);
    const char *zUser;
    const char *zComment;
    char * zEUser, * zEComment;
#define ADD_PRIMARY_PARENT_UUID 0 /* temporary local macro */
#if ADD_PRIMARY_PARENT_UUID
    char * zParent = NULL;
#endif
    int mtime, omtime;
    v = cson_value_new_object();
    o = cson_value_get_object(v);
#define SET(K,V) cson_object_set(o,(K), (V))
    SET("type", eventTypeLabel );
    SET("uuid",json_new_string(zUuid));
    SET("isLeaf", cson_value_new_bool(is_a_leaf(rid)));
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    mtime = db_column_int(&q,1);
    SET("mtime",json_new_int(mtime));
    omtime = db_column_int(&q,4);
    if(omtime && (omtime!=mtime)){
      SET("originTime",json_new_int(omtime));
    }

#if ADD_PRIMARY_PARENT_UUID
    zParent = db_text(0,
      "SELECT uuid FROM plink, blob"
      " WHERE plink.cid=%d AND blob.rid=plink.pid"
      " AND plink.isprim",
      rid
    );
    tmpV = zParent ? json_new_string(zParent) : cson_value_null();
    if(zParent){
      SET("parentUuid", json_new_string(zParent));
    free(zParent);
    zParent = NULL;
    SET("parentUuid", tmpV );
#endif
#undef ADD_PRIMARY_PARENT_UUID

    tmpV = json_parent_uuids_for_ci(rid);
    if(tmpV){
      SET("parents", tmpV);
    }

    tmpV = json_tags_for_checkin_rid(rid,0);
    if(tmpV){
      SET("tags",tmpV);
    }

    if( showFiles ){
      cson_value * fileList = json_get_changed_files(rid);
      if(fileList){
        SET("files",fileList);
      tmpV = json_get_changed_files(rid);
      if(tmpV){
        SET("files",tmpV);
      }
    }


#undef SET
  }
  free(zParent);
  db_finalize(&q);
  return v;
}

/*
** Very incomplete/incorrect impl of /json/artifact/TICKET_ID.
*/