/usr/share/psi/plugin/plugin.cc.template is in psi4-data 1:0.3-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | /*
 *@BEGIN LICENSE
 *
 * @plugin@ by Psi4 Developer, a plugin to:
 *
 * PSI4: an ab initio quantum chemistry software package
 *
 * This program 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 2 of the License, or
 * (at your option) any later version.
 *
 * 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.  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, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 *@END LICENSE
 */
#include <libplugin/plugin.h>
#include <psi4-dec.h>
#include <libparallel/parallel.h>
#include <liboptions/liboptions.h>
#include <libmints/mints.h>
#include <libpsio/psio.hpp>
INIT_PLUGIN
using namespace boost;
namespace psi{ namespace @plugin@ {
extern "C" 
int read_options(std::string name, Options& options)
{
    if (name == "@PLUGIN@"|| options.read_globals()) {
        /*- The amount of information printed to the output file -*/
        options.add_int("PRINT", 1);
    }
    return true;
}
extern "C" 
PsiReturnType @plugin@(Options& options)
{
    int print = options.get_int("PRINT");
    /* Your code goes here */
    return Success;
}
}} // End namespaces
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