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+/* GNU Guile interface for GNU Make.
+Copyright (C) 2011-2013 Free Software Foundation, Inc.
+This file is part of GNU Make.
+
+GNU Make 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 3 of the License, or (at your option) any later
+version.
+
+GNU Make 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, see <http://www.gnu.org/licenses/>. */
+
+#include "makeint.h"
+#include "gnumake.h"
+
+#include "debug.h"
+#include "filedef.h"
+#include "dep.h"
+#include "variable.h"
+
+#include <libguile.h>
+
+/* Pre-2.0 versions of Guile don't have a typedef for gsubr function types. */
+#if SCM_MAJOR_VERSION < 2
+# define GSUBR_TYPE SCM (*) ()
+/* Guile 1.x doesn't really support i18n. */
+# define EVAL_STRING(_s) scm_c_eval_string (_s)
+#else
+# define GSUBR_TYPE scm_t_subr
+# define EVAL_STRING(_s) scm_eval_string (scm_from_utf8_string (_s))
+#endif
+
+static SCM make_mod = SCM_EOL;
+static SCM obj_to_str = SCM_EOL;
+
+/* Convert an SCM object into a string. */
+static char *
+cvt_scm_to_str (SCM obj)
+{
+ return scm_to_locale_string (scm_call_1 (obj_to_str, obj));
+}
+
+/* Perform the GNU make expansion function. */
+static SCM
+guile_expand_wrapper (SCM obj)
+{
+ char *str = cvt_scm_to_str (obj);
+ SCM ret;
+ char *res;
+
+ DB (DB_BASIC, (_("guile: Expanding '%s'\n"), str));
+ res = gmk_expand (str);
+ ret = scm_from_locale_string (res);
+
+ free (str);
+ free (res);
+
+ return ret;
+}
+
+/* Perform the GNU make eval function. */
+static SCM
+guile_eval_wrapper (SCM obj)
+{
+ char *str = cvt_scm_to_str (obj);
+
+ DB (DB_BASIC, (_("guile: Evaluating '%s'\n"), str));
+ gmk_eval (str, 0);
+
+ return SCM_BOOL_F;
+}
+
+/* Invoked by scm_c_define_module(), in the context of the GNU make module. */
+static void
+guile_define_module (void *data UNUSED)
+{
+/* Ingest the predefined Guile module for GNU make. */
+#include "gmk-default.h"
+
+ /* Register a subr for GNU make's eval capability. */
+ scm_c_define_gsubr ("gmk-expand", 1, 0, 0, (GSUBR_TYPE) guile_expand_wrapper);
+
+ /* Register a subr for GNU make's eval capability. */
+ scm_c_define_gsubr ("gmk-eval", 1, 0, 0, (GSUBR_TYPE) guile_eval_wrapper);
+
+ /* Define the rest of the module. */
+ scm_c_eval_string (GUILE_module_defn);
+}
+
+/* Initialize the GNU make Guile module. */
+static void *
+guile_init (void *arg UNUSED)
+{
+ /* Define the module. */
+ make_mod = scm_c_define_module ("gnu make", guile_define_module, NULL);
+
+ /* Get a reference to the object-to-string translator, for later. */
+ obj_to_str = scm_variable_ref (scm_c_module_lookup (make_mod, "obj-to-str"));
+
+ /* Import the GNU make module exports into the generic space. */
+ scm_c_eval_string ("(use-modules (gnu make))");
+
+ return NULL;
+}
+
+static void *
+internal_guile_eval (void *arg)
+{
+ return cvt_scm_to_str (EVAL_STRING (arg));
+}
+
+/* This is the function registered with make */
+static char *
+func_guile (const char *funcname UNUSED, unsigned int argc UNUSED, char **argv)
+{
+ static int init = 0;
+
+ if (! init)
+ {
+ /* Initialize the Guile interpreter. */
+ scm_with_guile (guile_init, NULL);
+ init = 1;
+ }
+
+ if (argv[0] && argv[0][0] != '\0')
+ return scm_with_guile (internal_guile_eval, argv[0]);
+
+ return NULL;
+}
+
+/* ----- Public interface ----- */
+
+/* We could send the flocp to define_new_function(), but since guile is
+ "kind of" built-in, that didn't seem so useful. */
+int
+guile_gmake_setup (const gmk_floc *flocp UNUSED)
+{
+ /* Create a make function "guile". */
+ gmk_add_function ("guile", func_guile, 0, 1, GMK_FUNC_DEFAULT);
+
+ return 1;
+}