/*******************************************************************/

/*  sbpython3: external configurable build project for Python-3.x. */

/*  Copyright (C) 2018--2021  SysDeer Technologies, LLC            */

/*  Released under the Standard MIT License; see COPYING.SBPYTHON3.*/

/*******************************************************************/

/*******************************************************************/

/* pyexts.c: a simple development-time utility for generating      */

/* make rules for python's extension modules. The utility is       */

/* included with the sbpython3 project for reference only.         */

/*                                                                 */

/* cc -std=c99 -D_XOPEN_SOURCE=700 pyexts.c                        */

/*******************************************************************/

#include <stdio.h>

#include <string.h>

#include "pyexts.h"

static void pyext_uppercase(char * buf, const char * name)

{

	const char *	src;

	char *		dst;

	src = name;

	dst = buf;

	for (; *src; )

		*dst++ = ((*src >= 'a') && (*src <= 'z'))

			? 'A' - 'a' + *src++ : *src++;

	*dst = 0;

}

int main(int argc, char ** argv)

{

	const struct pyext_meta *	p;

	size_t				nlen;

	const char **			parg;

	const char *			dtab;

	const char *			otab;

	const char *			htab;

	const char *			stab;

	const char *			ltab;

	const char *			rtab;

	const char *			vtab;

	const char *			name;

	char				fmt[64];

	char				uname[64];

	if ((argc == 2) && !strcmp(argv[1],"--py-init-func")) {

		for (p=pyexts; p->name; p++)

			printf("PY_INIT_FUNC(%s);\n",p->name);

		return 0;

	}

	if ((argc == 2) && !strcmp(argv[1],"--init-func-ptr")) {

		for (p=pyexts; p->name; p++) {

			nlen = strlen(p->name);

			sprintf(fmt,"\t{\"%%s\",%%-%zusPyInit_%%s},%%-%zus\\\n",

				20-nlen,23-nlen);

			printf(fmt,p->name," ",p->name," ");

		}

		return 0;

	}

	for (p=pyexts; p->name; p++) {

		/* init */

		name = (p->name[0] == '_') ? &p->name[1] : p->name;

		nlen = strlen(name);

		pyext_uppercase(uname,name);

		/* pretty */

		dtab = (nlen <= 4)

			? "\t\t\t"

			: (nlen <= 12)

				? "\t\t" : "\t";

		otab = (nlen <= 3)

			? "\t\t\t"

			: (nlen <= 11)

				? "\t\t" : "\t";

		ltab = (nlen <= 2)

			? "\t\t\t"

			: (nlen <= 10)

				? "\t\t" : "\t";

		rtab = (nlen <= 1)

			? "\t\t\t"

			: (nlen <= 9)

				? "\t\t" : "\t";

		vtab = (nlen <= 6)

			? "\t\t"

			: (nlen <= 14)

				? "\t" : "";

		htab = (nlen <= 8)

			? "\t\t" : "\t";

		stab = (nlen <= 9)

			? "\t\t" : "\t";

		/* output */

		printf("# %s\n",p->name);

		for (parg=p->srcs; *parg; parg++)

			printf("PYEXT_%s_SRCS%s+= "

				"pyext/obj/%s.c\n",

				uname,dtab,*parg);

		printf("\n");

		printf("PYEXT_%s_LOBJS%s= $(PYEXT_%s_SRCS:.c=.lo)\n",uname,otab,uname);

		printf("PYEXT_%s_OBJS%s= $(PYEXT_%s_SRCS:.c=.o)\n",uname,dtab,uname);

		printf("\n");

		for (parg=p->hdrs; parg && *parg; parg++)

			printf("$(PYEXT_%s_LOBJS):%s"

				"CFLAGS_CONFIG += %s\n",

				uname,htab,*parg);

		for (parg=p->hdrs; parg && *parg; parg++)

			printf("$(PYEXT_%s_OBJS):%s"

				"CFLAGS_CONFIG += %s\n",

				uname,stab,*parg);

		for (parg=p->cstd; parg && *parg; parg++)

				printf("$(PYEXT_%s_LOBJS):%s"

					"CFLAGS_LAST += %s\n",

					uname,otab,*parg);

		for (parg=p->cstd; parg && *parg; parg++)

			printf("$(PYEXT_%s_OBJS):%s"

				"CFLAGS_LAST += %s\n",

				uname,dtab,*parg);

		if (p->hdrs || p->cstd)

			printf("\n");

		printf("PYEXT_%s_SHARED%s= pyext/%s$(PYTHON_SOEXT)\n",uname,ltab,p->name);

		printf("PYEXT_%s_STATIC%s= pyext/%s$(OS_ARCHIVE_EXT)\n",uname,ltab,p->name);

		printf("\n");

		for (parg=p->vars; parg && *parg; parg++)

			printf("$(PYEXT_%s_SHARED):%s"

				"LDFLAGS_DYNEXT += %s\n",

				uname,vtab,*parg);

		for (parg=p->deps; parg && *parg; parg++)

			printf("$(PYEXT_%s_SHARED):%s%s\n",uname,vtab,*parg);

		printf("$(PYEXT_%s_SHARED):%s$(PYEXT_%s_LOBJS)\n",uname,vtab,uname);

		printf("$(PYEXT_%s_STATIC):%s$(PYEXT_%s_OBJS)\n",uname,vtab,uname);

		printf("\n");

		printf("pyext-%s-shared:%s$(PYEXT_%s_SHARED)\n",name,rtab,uname);

		printf("pyext-%s-static:%s$(PYEXT_%s_STATIC)\n",name,rtab,uname);

		printf("\n");

		printf("pyext-%s-clean:\n",name);

		printf("\trm -f $(PYEXT_%s_LOBJS)\n",uname);

		printf("\trm -f $(PYEXT_%s_OBJS)\n",uname);

		printf("\trm -f $(PYEXT_%s_SHARED)\n",uname);

		printf("\trm -f $(PYEXT_%s_STATIC)\n",uname);

		printf("\n");

		printf("clean:\tpyext-%s-clean\n",name);

		printf("\n");

		printf(".PHONY:\tpyext-%s-shared\n",name);

		printf(".PHONY:\tpyext-%s-static\n",name);

		printf(".PHONY:\tpyext-%s-clean\n",name);

		printf("\n\n");

	}

	return 0;

}