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

/*  slibtool: a skinny libtool implementation, written in C        */

/*  Copyright (C) 2016--2018  Z. Gilboa                            */

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

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

#include <stdio.h>

#include <unistd.h>

#include <string.h>

#include <errno.h>

#include <slibtool/slibtool.h>

#include "slibtool_driver_impl.h"

#include "slibtool_dprintf_impl.h"

#ifndef SLBT_DRIVER_FLAGS

#define SLBT_DRIVER_FLAGS	SLBT_DRIVER_VERBOSITY_ERRORS \

				| SLBT_DRIVER_VERBOSITY_USAGE

#endif

static const char vermsg[] = "%s%s%s (https://git.foss21.org/slibtool): "

			     "version %s%d.%d.%d%s.\n"

			     "%s%s%s%s%s\n";

static const char * const slbt_ver_color[6] = {

		"\x1b[1m\x1b[35m","\x1b[0m",

		"\x1b[1m\x1b[32m","\x1b[0m",

		"\x1b[1m\x1b[34m","\x1b[0m"

};

static const char * const slbt_ver_plain[6] = {

		"","",

		"","",

		"",""

};

static ssize_t slbt_version(struct slbt_driver_ctx * dctx, int fdout)

{

	const struct slbt_source_version * verinfo;

	const char * const * verclr;

	bool gitver;

	verinfo = slbt_source_version();

	verclr  = isatty(fdout) ? slbt_ver_color : slbt_ver_plain;

	gitver  = strcmp(verinfo->commit,"unknown");

	return slbt_dprintf(fdout,vermsg,

			verclr[0],dctx->program,verclr[1],

			verclr[2],verinfo->major,verinfo->minor,

			verinfo->revision,verclr[3],

			gitver ? "[commit reference: " : "",

			verclr[4],gitver ? verinfo->commit : "",

			verclr[5],gitver ? "]" : "");

}

static void slbt_perform_driver_actions(struct slbt_driver_ctx * dctx)

{

	if (dctx->cctx->drvflags & SLBT_DRIVER_CONFIG)

		slbt_output_config(dctx);

	if (dctx->cctx->drvflags & SLBT_DRIVER_FEATURES)

		slbt_output_features(dctx);

	if (dctx->cctx->mode == SLBT_MODE_COMPILE)

		slbt_exec_compile(dctx,0);

	if (dctx->cctx->mode == SLBT_MODE_EXECUTE)

		slbt_exec_execute(dctx,0);

	if (dctx->cctx->mode == SLBT_MODE_INSTALL)

		slbt_exec_install(dctx,0);

	if (dctx->cctx->mode == SLBT_MODE_LINK)

		slbt_exec_link(dctx,0);

	if (dctx->cctx->mode == SLBT_MODE_UNINSTALL)

		slbt_exec_uninstall(dctx,0);

}

static int slbt_exit(struct slbt_driver_ctx * dctx, int ret)

{

	slbt_output_error_vector(dctx);

	slbt_free_driver_ctx(dctx);

	return ret;

}

int slbt_main(char ** argv, char ** envp, const struct slbt_fd_ctx * fdctx)

{

	int				ret;

	const char *			harg;

	int				fdout;

	uint64_t			flags;

	struct slbt_driver_ctx *	dctx;

	char *				program;

	char *				dash;

	char *				sargv[5];

	flags = SLBT_DRIVER_FLAGS;

	fdout = fdctx ? fdctx->fdout : STDOUT_FILENO;

	/* harg */

	harg = (!argv || !argv[0] || !argv[1] || argv[2])

		? 0 : argv[1];

	/* --version only? */

	if (harg && (!strcmp(harg,"--version")

				|| !strcmp(harg,"--help-all")

				|| !strcmp(harg,"--help")

				|| !strcmp(harg,"-h"))) {

		sargv[0] = argv[0];

		sargv[1] = argv[1];

		sargv[2] = "--mode=compile";

		sargv[3] = "<compiler>";

		sargv[4] = 0;

		return (slbt_get_driver_ctx(sargv,envp,flags,fdctx,&dctx))

			? SLBT_ERROR : (slbt_version(dctx,fdout) < 0)

				? slbt_exit(dctx,SLBT_ERROR)

				: slbt_exit(dctx,SLBT_OK);

	}

	/* program */

	if ((program = strrchr(argv[0],'/')))

		program++;

	else

		program = argv[0];

	/* dash */

	if ((dash = strrchr(program,'-')))

		dash++;

	/* flags */

	if (dash == 0)

		flags = SLBT_DRIVER_FLAGS;

	else if (!(strcmp(dash,"shared")))

		flags = SLBT_DRIVER_FLAGS | SLBT_DRIVER_DISABLE_STATIC;

	else if (!(strcmp(dash,"static")))

		flags = SLBT_DRIVER_FLAGS | SLBT_DRIVER_DISABLE_SHARED;

	/* debug */

	if (!(strcmp(program,"dlibtool")))

		flags |= SLBT_DRIVER_DEBUG;

	else if (!(strncmp(program,"dlibtool",8)))

		if ((program[8] == '-') || (program[8] == '.'))

			flags |= SLBT_DRIVER_DEBUG;

	/* legabits */

	if (!(strcmp(program,"clibtool")))

		flags |= SLBT_DRIVER_LEGABITS;

	else if (!(strncmp(program,"clibtool",8)))

		if ((program[8] == '-') || (program[8] == '.'))

			flags |= SLBT_DRIVER_LEGABITS;

	/* heuristics */

	if (!(strcmp(program,"rlibtool")))

		flags |= SLBT_DRIVER_HEURISTICS;

	/* heuristics + legabits */

	if (!(strcmp(program,"rclibtool")))

		flags |= (SLBT_DRIVER_HEURISTICS

                          | SLBT_DRIVER_LEGABITS);

	/* heuristics + debug */

	if (!(strcmp(program,"rdlibtool")))

		flags |= (SLBT_DRIVER_HEURISTICS

                          | SLBT_DRIVER_DEBUG);

	/* heuristics + debug + legabits */

	if (!(strcmp(program,"rdclibtool")))

		flags |= (SLBT_DRIVER_HEURISTICS

                          | SLBT_DRIVER_DEBUG

                          | SLBT_DRIVER_LEGABITS);

	/* driver context */

	if ((ret = slbt_get_driver_ctx(argv,envp,flags,fdctx,&dctx)))

		return (ret == SLBT_USAGE)

			? !argv || !argv[0] || !argv[1] || !argv[2]

			: SLBT_ERROR;

	if (dctx->cctx->drvflags & SLBT_DRIVER_VERSION)

		if ((slbt_version(dctx,fdout)) < 0)

			return slbt_exit(dctx,SLBT_ERROR);

	slbt_perform_driver_actions(dctx);

	return slbt_exit(dctx,dctx->errv[0] ? SLBT_ERROR : SLBT_OK);

}