Allow per-schema plv8_init functions.

perSchema_plv8_init.js.sql

/* public.plv8_startup()
 *
 *      Allow to have multiple per-schema plv8_init functions.
 *
 *   USAGE:
 *
 *      1. Add the following line to the end of your postgresql.conf file:
 *
 *          plv8.start_proc = 'public.plv8_startup'
 *
 *      2. Then define functions named "plv8_init" in each schema you want.
 *         They will be automaically called on plv8 startup as if it were
 *         simple plv8_init function. For more details see:
 *
 *              http://pgxn.org/dist/plv8/doc/plv8.html#Start-up.procedure
 */
create or replace function public.plv8_startup()
returns void as
$$

    // Get non-postgres schema list:
    var schemas = plv8.execute(
        "SELECT n.nspname AS \"name\"\n"
        + "FROM pg_catalog.pg_namespace n\n"
        + "WHERE n.nspname !~ '^pg_' AND n.nspname <> 'information_schema'\n"
    );

    // Check for plv8_init function in each one and execute it:
    for (var i in schemas) {
        var fName = schemas[i].name+".plv8_init";
        try {
            plv8.find_function(fName).apply(this, arguments);
        } catch (e) {};
    };

$$
language 'plv8'
;