/*******************************************************************/
/*  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;
}