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

/*  sbpython2: external configurable build project for Python-2.7. */

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

/*  Released under the Standard MIT License; see COPYING.SBPYTHON2.*/

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

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

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

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

/* included with the sbpython2 project for reference only.         */

/*                                                                 */

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

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

#include <stdio.h>

#include <string.h>

#define PYEXT_LIST(...)                   (const char *[]){__VA_ARGS__,0}

#define PYEXT_SIMPLE(name,...)            {name,PYEXT_LIST(__VA_ARGS__),0,0,0,0}

#define PYEXT_COMMON(name,hvar,lvar,...)  {name,PYEXT_LIST(__VA_ARGS__), \

                                           PYEXT_LIST(hvar),0,           \

                                           PYEXT_LIST(lvar),0}

#define PYEXT_ALTSTD(name,cstd,...)       {name,PYEXT_LIST(__VA_ARGS__), \

                                           0,PYEXT_LIST(cstd),0,0}

struct pyext_meta {

	const char *	name;

	const char **	srcs;

	const char **	hdrs;

	const char **	cstd;

	const char **	vars;

	const char **	deps;

};

static const struct pyext_meta pyexts[] = {

	PYEXT_SIMPLE("_multibytecodec","cjkcodecs/multibytecodec"),

	PYEXT_SIMPLE("_codecs_cn",     "cjkcodecs/_codecs_cn"),

	PYEXT_SIMPLE("_codecs_hk",     "cjkcodecs/_codecs_hk"),

	PYEXT_SIMPLE("_codecs_jp",     "cjkcodecs/_codecs_jp"),

	PYEXT_SIMPLE("_codecs_kr",     "cjkcodecs/_codecs_kr"),

	PYEXT_SIMPLE("_codecs_tw",     "cjkcodecs/_codecs_tw"),

	PYEXT_SIMPLE("_codecs_iso2022","cjkcodecs/_codecs_iso2022"),

	PYEXT_SIMPLE("_bisect",        "_bisectmodule"),

	PYEXT_SIMPLE("_collections",   "_collectionsmodule"),

	PYEXT_SIMPLE("_csv",           "_csv"),

	PYEXT_SIMPLE("_ctypes_test",   "_ctypes/_ctypes_test"),

	PYEXT_SIMPLE("_functools",     "_functoolsmodule"),

	PYEXT_SIMPLE("_heapq",         "_heapqmodule"),

	PYEXT_SIMPLE("_hotshot",       "_hotshot"),

	PYEXT_SIMPLE("_json",          "_json"),

	PYEXT_SIMPLE("_locale",        "_localemodule"),

	PYEXT_SIMPLE("_lsprof",        "_lsprof","rotatingtree"),

	PYEXT_SIMPLE("_random",        "_randommodule"),

	PYEXT_SIMPLE("_socket",        "socketmodule","timemodule"),

	PYEXT_SIMPLE("_struct",        "_struct"),

	PYEXT_SIMPLE("_testcapi",      "_testcapimodule"),

	PYEXT_SIMPLE("array",          "arraymodule"),

	PYEXT_SIMPLE("audioop",        "audioop"),

	PYEXT_SIMPLE("binascii",       "binascii"),

	PYEXT_SIMPLE("cPickle",        "cPickle"),

	PYEXT_SIMPLE("cStringIO",      "cStringIO"),

	PYEXT_SIMPLE("cmath",          "cmathmodule","_math"),

	PYEXT_SIMPLE("crypt",          "cryptmodule"),

	PYEXT_SIMPLE("datetime",       "datetimemodule","timemodule"),

	PYEXT_SIMPLE("fcntl",          "fcntlmodule"),

	PYEXT_SIMPLE("future_builtins","future_builtins"),

	PYEXT_SIMPLE("grp",            "grpmodule"),

	PYEXT_SIMPLE("itertools",      "itertoolsmodule"),

	PYEXT_SIMPLE("math",           "mathmodule","_math"),

	PYEXT_SIMPLE("mmap",           "mmapmodule"),

	PYEXT_SIMPLE("operator",       "operator"),

	PYEXT_SIMPLE("ossaudiodev",    "ossaudiodev"),

	PYEXT_SIMPLE("parser",         "parsermodule"),

	PYEXT_SIMPLE("resource",       "resource"),

	PYEXT_SIMPLE("select",         "selectmodule"),

	PYEXT_SIMPLE("spwd",           "spwdmodule"),

	PYEXT_SIMPLE("strop",          "stropmodule"),

	PYEXT_SIMPLE("syslog",         "syslogmodule"),

	PYEXT_SIMPLE("termios",        "termios"),

	PYEXT_SIMPLE("time",           "timemodule"),

	PYEXT_SIMPLE("unicodedata",    "unicodedata"),

	PYEXT_COMMON("_curses",        "$(CFLAGS_NCURSES)", "$(LDFLAGS_NCURSES)",  "_cursesmodule"),

	PYEXT_COMMON("_curses_panel",  "$(CFLAGS_NCURSES)", "$(LDFLAGS_NCURSES)",  "_curses_panel"),

	PYEXT_COMMON("_elementtree",   "-UVERSION",         "-lexpat",             "_elementtree"),

	PYEXT_COMMON("_hashlib",       0,                   "-lssl -lcrypto",      "_hashopenssl"),

	PYEXT_COMMON("_ssl",           0,                   "-lssl -lcrypto",      "_ssl"),

	PYEXT_COMMON("bz2",            0,                   "-lbz2",               "bz2module"),

	PYEXT_COMMON("gdbm",           0,                   "-lgdbm",              "gdbmmodule"),

	PYEXT_COMMON("readline",       0,                   "-lreadline",          "readline"),

	PYEXT_COMMON("pyexpat",        0,                   "-lexpat",             "pyexpat"),

	PYEXT_COMMON("zlib",           0,                   "-lz",                 "zlibmodule"),

	PYEXT_COMMON("_ctypes",0,"-lffi",

	             "_ctypes/_ctypes",

	             "_ctypes/callbacks",

	             "_ctypes/callproc",

	             "_ctypes/stgdict",

	             "_ctypes/cfield"),

	PYEXT_COMMON("_io",0,0,

	             "_io/bufferedio",

	             "_io/bytesio",

	             "_io/fileio",

	             "_io/iobase",

	             "_io/_iomodule",

	             "_io/stringio",

	             "_io/textio"),

	PYEXT_COMMON("_multiprocessing",0,0,

	             "_multiprocessing/multiprocessing",

	             "_multiprocessing/socket_connection",

	             "_multiprocessing/semaphore"),

	PYEXT_COMMON("_sqlite3",

	             "$(CFLAGS_SQLITE)",

	             "$(LDFLAGS_SQLITE)",

	             "_sqlite/cache",

	             "_sqlite/connection",

	             "_sqlite/cursor",

	             "_sqlite/microprotocols",

	             "_sqlite/module",

	             "_sqlite/prepare_protocol",

	             "_sqlite/row",

	             "_sqlite/statement",

	             "_sqlite/util"),

	PYEXT_COMMON("dbm",

	             "$(CFLAGS_DBM)",

	             "$(LDFLAGS_DBM)",

	             "dbmmodule"),

	PYEXT_ALTSTD("linuxaudiodev",

	             "-std=gnu99",

	             "linuxaudiodev"),

	{0,0,0,0,0,0},

};

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				uname[64];

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

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

			printf("PY_INIT_FUNC(init%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);

			if (nlen <= 3)

				dtab = "\t\t\t";

			else if (nlen <= 11)

				dtab = "\t\t";

			else

				dtab = "\t";

			if (nlen <= 9)

				rtab = "\t\t";

			else

				rtab = "\t";

			printf("\t{\"%s\",%sinit%s},%s\\\n",

				p->name,dtab,p->name,rtab);

		}

		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$(OS_LIB_SUFFIX)\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;

}