/* ==================================================================

    FILE: "/home/joze/src/tclreadline/tclreadline.c"
    LAST MODIFICATION: "Thu, 23 Mar 2000 22:42:52 +0100 (joze)"
    LAST MODIFICATION: "Sat, 25 Mar 2000 21:40:27 +0100 (joze)"
    (C) 1998 - 2000 by Johannes Zellner, <johannes@zellner.org>
    $Id$
    ---

    tclreadline -- gnu readline for tcl
    Copyright (C) 1998 - 2000 by Johannes Zellner

    http://www.zellner.org/tclreadline/
    This program 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 2
    of the License, or (at your option) any later version.

    Copyright (c) 1998 - 2000, Johannes Zellner <johannes@zellner.org>
    This program 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, write to the Free Software
    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

    This software is copyright under the BSD license.
    <johannes@zellner.org>, http://www.zellner.org/tclreadline/

    ================================================================== */  

#ifdef HAVE_CONFIG_H
#   include "config.h"
#endif

    char**         cmd;
    struct cmds_t* next;
} cmds_t;


#define ISWHITE(c) ((' ' == c) || ('\t' == c) || ('\n' == c))

/*
 * forward declarations.
/* forward declarations. */
 */
char* stripleft(char* in);
char* stripright(char* in);
char* stripwhite(char* in);
int TclReadlineLineComplete(void);
void TclReadlineTerminate(int state);
char* TclReadlineQuote(char* text, char* quotechars);
int TclReadlineCmd(ClientData clientData, Tcl_Interp* interp,
static char* stripleft(char* in);
static char* stripright(char* in);
static char* stripwhite(char* in);
static int TclReadlineLineComplete(void);
static void TclReadlineTerminate(int state);
static char* TclReadlineQuote(char* text, char* quotechars);
static int TclReadlineCmd(ClientData clientData, Tcl_Interp* interp, int argc, char** argv);
    int argc, char** argv);
void TclReadlineReadHandler(ClientData clientData, int mask);
void TclReadlineLineCompleteHandler(char* ptr);
static void TclReadlineReadHandler(ClientData clientData, int mask);
static void TclReadlineLineCompleteHandler(char* ptr);
int Tclreadline_SafeInit(Tcl_Interp* interp);
int Tclreadline_Init(Tcl_Interp* interp);
int TclReadlineInitialize(Tcl_Interp* interp, char* historyfile);
int blank_line(char* str);
char** TclReadlineCompletion(char* text, int start, int end);
char* TclReadline0generator(char* text, int state);
char* TclReadlineKnownCommands(char* text, int state, int mode);
int TclReadlineParse(char** args, int maxargs, char* buf);
static int TclReadlineInitialize(Tcl_Interp* interp, char* historyfile);
static int blank_line(char* str);
static char** TclReadlineCompletion(char* text, int start, int end);
static char* TclReadline0generator(char* text, int state);
static char* TclReadlineKnownCommands(char* text, int state, int mode);
static int TclReadlineParse(char** args, int maxargs, char* buf);

/* must be non-static */
int Tclreadline_SafeInit(Tcl_Interp* interp);
int Tclreadline_Init(Tcl_Interp* interp);


enum { 
    LINE_PENDING = -1,
    LINE_EOF = (1 << 8),
    LINE_COMPLETE = (1 << 9)
};

/**
 * global variables
 */
static int tclrl_state = TCL_OK;
static char* tclrl_eof_string = (char*) NULL;
static char* tclrl_custom_completer = (char*) NULL;
static char* tclrl_last_line = (char*) NULL;
static int tclrl_use_builtin_completer = 1;
static int tclrl_history_length = -1;
Tcl_Interp* tclrl_interp = (Tcl_Interp*) NULL;

static char* tclrl_license =
"   Copyright (c) 1998 - 2000, Johannes Zellner <johannes@zellner.org>\n"
"   All rights reserved.\n"
"   \n"
"   Redistribution and use in source and binary forms, with or without\n"
"   modification, are permitted provided that the following conditions\n"
"   are met:\n"
"   \n"
"     * Redistributions of source code must retain the above copyright\n"
"       notice, this list of conditions and the following disclaimer.\n"
"     * Redistributions in binary form must reproduce the above copyright\n"
"       notice, this list of conditions and the following disclaimer in the\n"
"       documentation and/or other materials provided with the distribution.\n"
"     * Neither the name of Johannes Zellner nor the names of contributors\n"
"       to this software may be used to endorse or promote products derived\n"
"       from this software without specific prior written permission.\n"
"       \n"
"   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n"
"   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n"
"   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n"
"   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR\n"
"   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\n"
"   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,\n"
"   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR\n"
"   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF\n"
"   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING\n"
"   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS\n"
"   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.";



char*
static char*
stripleft(char* in)
{
    char* ptr = in;
    while (*ptr && *ptr <= ' ')
	ptr++;
    if (in != ptr)
	memmove(in, ptr, strlen(ptr) + 1);
    return in;
}

char*
static char*
stripright(char* in)
{
    char* ptr;
    for (ptr = strchr(in, '\0') - 1; ptr >= in && *ptr <= ' '; ptr--)
	*ptr = '\0';
    return in;
}

char*
static char*
stripwhite(char* in)
{
    stripleft(in);
    stripright(in);
    return in;
}

int
static int
TclReadlineLineComplete(void)
{
    return !(tclrl_state == LINE_PENDING);
}

void
static void
TclReadlineTerminate(int state)
{
    tclrl_state = state;
    rl_callback_handler_remove();
}

char*
static char*
TclReadlineQuote(char* text, char* quotechars)
{
    char* ptr;
    char* result_c;
    int i, len = strlen(quotechars);
    Tcl_DString result;

	}
	Tcl_DStringAppend(&result, ptr, 1);
    }
    result_c = strdup(Tcl_DStringValue(&result));
    return result_c;
}

int
static int
TclReadlineCmd(
    ClientData  clientData,
    Tcl_Interp* interp,     /* Current interpreter */
    int         argc,       /* Number of arguments */
    char**      argv        /* Argument strings    */
	      )
{

    Tcl_AppendResult(interp,
	"wrong # args: should be \"readline option ?arg ...?\"",
	(char*) NULL);
    return TCL_ERROR;

}

void
static void
TclReadlineReadHandler(ClientData clientData, int mask)
{
    if (mask & TCL_READABLE) {
#ifdef EXECUTING_MACRO_HACK
	do {
#endif
	    rl_callback_read_char();
#ifdef EXECUTING_MACRO_HACK
	    /**
	     * check, if we're inside a macro and
	     * if so, read all macro characters
	     * until the next eol.
	     */
	} while (_rl_executing_macro && !TclReadlineLineComplete());
#endif
    }
}

void
static void
TclReadlineLineCompleteHandler(char* ptr)
{
    if (!ptr) { /* <c-d> */

	TclReadlineTerminate(LINE_EOF);

    } else {

	/**
	 * From version 0.9.3 upwards, all lines are
	 * returned, even empty lines. (Only non-empty
	 * lines are stuffed in readline's history.)
	 * The calling script is responsible for handling
	 * empty strings.
	 */

	char* expansion = (char*) NULL;
	int status = history_expand(ptr, &expansion);

	if (status >= 1) {
#if 0
	    Tcl_Channel channel = Tcl_MakeFileChannel(stdout, TCL_WRITABLE);
	    /* Tcl_RegisterChannel(interp, channel); */
	    (void) Tcl_WriteChars(channel, expansion, -1);
	    Tcl_Flush(channel);
	    Tcl_Close(interp, channel);
#else
	    /* TODO: make this a valid tcl output */
	    printf("%s\n", expansion);
#endif
	} else if (-1 == status) {
	    Tcl_AppendResult
	    (tclrl_interp, "error in history expansion\n", (char*) NULL);
	    TclReadlineTerminate(TCL_ERROR);
	}
	/**
	 * TODO: status == 2 ...

    int status;
    Tcl_CreateCommand(interp, "::tclreadline::readline", TclReadlineCmd,
	(ClientData) NULL, (Tcl_CmdDeleteProc *) NULL);
    tclrl_interp = interp;
    if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::historyLength",
		(char*) &tclrl_history_length, TCL_LINK_INT)))
	return status;

    if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::library",
		(char*) &TCLRL_LIBRARY, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
	return status;
    if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::version",
		(char*) &TCLRL_VERSION, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
	return status;
    if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::patchLevel",
		(char*) &TCLRL_PATCHLEVEL, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
	return status;
    if (TCL_OK != (status = Tcl_LinkVar(interp, "::tclreadline::license",
		(char*) &tclrl_license, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
	return status;

    if (TCL_OK != (status = Tcl_LinkVar(interp, "tclreadline_library",
		(char*) &TCLRL_LIBRARY, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
	return status;
    if (TCL_OK != (status = Tcl_LinkVar(interp, "tclreadline_version",
		(char*) &TCLRL_VERSION, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
	return status;
    if (TCL_OK != (status = Tcl_LinkVar(interp, "tclreadline_patchLevel",
		(char*) &TCLRL_PATCHLEVEL, TCL_LINK_STRING | TCL_LINK_READ_ONLY)))
	return status;

    return Tcl_PkgProvide(interp, "tclreadline", TCLRL_VERSION);
}

int
static int
TclReadlineInitialize(Tcl_Interp* interp, char* historyfile)
{
    rl_readline_name = "tclreadline";
    /*    rl_special_prefixes = "${\"["; */
    rl_special_prefixes = "$";
    /**
     * default is " \t\n\"\\'`@$><=;|&{("

	    Tcl_AppendResult (interp, "warning: `",
		historyfile, "' is not writable.", (char*) NULL);
	}
    }
    return TCL_OK;
}

int
static int
blank_line(char* str)
{
    char* ptr;
    for (ptr = str; ptr && *ptr; ptr++) {
	if (!ISWHITE(*ptr))
	    return 0;
    }
    return 1;
}

char**
static char**
TclReadlineCompletion(char* text, int start, int end)
{
    char** matches = (char**) NULL;
    int status;
    rl_completion_append_character = ' '; /* reset, just in case ... */

    if (text && ('!' == text[0]

    if (!matches && tclrl_use_builtin_completer) {
	matches = completion_matches(text, TclReadline0generator);
    }

    return matches;
}

char*
static char*
TclReadline0generator(char* text, int state)
{
    return TclReadlineKnownCommands(text, state, _CMD_GET);
}

char*
static char*
TclReadlineKnownCommands(char* text, int state, int mode)
{
    static int len;
    static cmds_t *cmds = (cmds_t *) NULL, *new;
    char* tmp;
    char* args[256];
    int i, argc;

	    return (char*) NULL;
	    break;

    }
    /* NOTREACHED */
}

int
static int
TclReadlineParse(char** args, int maxargs, char* buf)
{
    int nr = 0;

    while (*buf != '\0' && nr < maxargs) {
	/*
	 * Strip whitespace.  Use nulls, so