84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/*
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* Feynman -- Wayland compositor for GNU Emacs
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*
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* Copyright (c) 2022 Sameer Rahmani <lxsameer@gnu.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "export.h"
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#include <emacs-module.h>
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/* Declare mandatory GPL symbol. */
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FEYNMAN_EXPORT int plugin_is_GPL_compatible = 0;
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/* New emacs lisp function. All function exposed to Emacs must have this
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* prototype. */
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static emacs_value
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feynman_init (emacs_env *env, ptrdiff_t nargs, emacs_value args[], void *data)
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{
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(void)nargs;
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(void)args;
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(void)data;
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return env->make_integer (env, 42);
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}
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/* Bind NAME to FUN. */
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static void
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bind_function (emacs_env *env, const char *name, emacs_value Sfun)
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{
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/* Set the function cell of the symbol named NAME to SFUN using
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the 'fset' function. */
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/* Convert the strings to symbols by interning them */
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emacs_value Qfset = env->intern (env, "fset");
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emacs_value Qsym = env->intern (env, name);
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/* Prepare the arguments array */
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emacs_value args[] = { Qsym, Sfun };
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/* Make the call (2 == nb of arguments) */
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env->funcall (env, Qfset, 2, args);
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}
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/* Provide FEATURE to Emacs. */
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static void
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provide (emacs_env *env, const char *feature)
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{
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/* call 'provide' with FEATURE converted to a symbol */
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emacs_value Qfeat = env->intern (env, feature);
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emacs_value Qprovide = env->intern (env, "provide");
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emacs_value args[] = { Qfeat };
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env->funcall (env, Qprovide, 1, args);
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}
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FEYNMAN_EXPORT int
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emacs_module_init (struct emacs_runtime *ert)
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{
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emacs_env *env = ert->get_environment (ert);
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/* create a lambda (returns an emacs_value) */
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emacs_value fun = env->make_function (
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env, 0, /* min. number of arguments */
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0, /* max. number of arguments */
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feynman_init, /* actual function pointer */
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"Initialize the compositor", /* docstring */
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NULL /* user pointer of your choice (data param in feynman_init) */
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);
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bind_function (env, "feynman/init", fun);
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provide (env, "feynman");
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return 0;
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}
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