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/* forward declarations. */
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);

static void TclReadlineReadHandler(ClientData clientData, int mask);
static void TclReadlineLineCompleteHandler(char* ptr);
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);
................................................................................
	}
	Tcl_DStringAppend(&result, ptr, 1);
    }
    result_c = strdup(Tcl_DStringValue(&result));
    return result_c;
}

static int
TclReadlineCmd(
    ClientData  clientData,
    Tcl_Interp* interp,     /* Current interpreter */
    int         argc,       /* Number of arguments */
    char**      argv        /* Argument strings    */
	      )
{
    int i, obj_idx, status;
    Tcl_Obj** objv = (Tcl_Obj**) MALLOC((argc + 1) * sizeof(Tcl_Obj *));

    static char *subCmds[] = {
	"read", "initialize", "write", "add", "complete",
	"customcompleter", "builtincompleter", "eofchar",
	"reset-terminal", "bell",
	(char *) NULL
    };
    enum SubCmdIdx {
	TCLRL_READ, TCLRL_INITIALIZE, TCLRL_WRITE, TCLRL_ADD, TCLRL_COMPLETE,
	TCLRL_CUSTOMCOMPLETER, TCLRL_BUILTINCOMPLETER, TCLRL_EOFCHAR,
	TCLRL_RESET_TERMINAL, TCLRL_BELL
    };


    Tcl_ResetResult(interp); /* clear the result space */

    for (i = 0;  i < argc;  i++) {
	Tcl_Obj* objPtr = Tcl_NewStringObj(argv[i], -1);
	Tcl_IncrRefCount(objPtr);
	objv[i] = objPtr;
    }
    objv[argc] = 0; /* terminate */

    if (argc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
	return TCL_ERROR;
    }

    status = Tcl_GetIndexFromObj
    (interp, objv[1], subCmds, "option", 0, (int *) &obj_idx);

    if (status != TCL_OK) {
	FREE(objv)
	return status;
    }

    switch (obj_idx) {

	case TCLRL_READ:

	    rl_callback_handler_install(argc == 3 ? argv[2] : "%",

		TclReadlineLineCompleteHandler);

	    Tcl_CreateFileHandler(0, TCL_READABLE,
		TclReadlineReadHandler, (ClientData) NULL);

	    /**
	     * Main Loop.
	     * XXX each modification of the global variables
................................................................................
		    return tclrl_state;
		    /* NOTREACHED */
		    break;
	    }
	    break;

	case TCLRL_INITIALIZE:
	    if (3 != argc) {
		Tcl_WrongNumArgs(interp, 2, objv, "historyfile");
		return TCL_ERROR;
	    } else {
		return TclReadlineInitialize(interp, argv[2]);

	    }
	    break;

	case TCLRL_WRITE:
	    if (3 != argc) {
		Tcl_WrongNumArgs(interp, 2, objv, "historyfile");
		return TCL_ERROR;
	    }  else if (write_history(argv[2])) {
		Tcl_AppendResult(interp, "unable to write history to `",
		    argv[2], "'\n", (char*) NULL);
		return TCL_ERROR;
	    }
	    if (tclrl_history_length >= 0) {

		history_truncate_file(argv[2], tclrl_history_length);
	    }
	    return TCL_OK;
	    break;

	case TCLRL_ADD:
	    if (3 != argc) {
		Tcl_WrongNumArgs(interp, 2, objv, "completerLine");
		return TCL_ERROR;
	    } else if (TclReadlineKnownCommands(argv[2], (int) 0, _CMD_SET)) {


		Tcl_AppendResult(interp, "unable to add command \"",
		    argv[2], "\"\n", (char*) NULL);
	    }
	    break;

	case TCLRL_COMPLETE:
	    if (3 != argc) {
		Tcl_WrongNumArgs(interp, 2, objv, "line");
		return TCL_ERROR;
	    } else if (Tcl_CommandComplete(argv[2])) {
		Tcl_AppendResult(interp, "1", (char*) NULL);
	    } else {
		Tcl_AppendResult(interp, "0", (char*) NULL);
	    }
	    break;

	case TCLRL_CUSTOMCOMPLETER:
	    if (argc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?scriptCompleter?");
		return TCL_ERROR;
	    } else if (3 == argc) {
		if (tclrl_custom_completer)
		    FREE(tclrl_custom_completer);
		if (!blank_line(argv[2]))
		    tclrl_custom_completer = stripwhite(strdup(argv[2]));

	    }
	    Tcl_AppendResult(interp, tclrl_custom_completer, (char*) NULL);
	    break;

	case TCLRL_BUILTINCOMPLETER:
	    if (argc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?boolean?");
		return TCL_ERROR;
	    } else if (3 == argc) {
		int bool = tclrl_use_builtin_completer;
		if (TCL_OK != Tcl_GetBoolean(interp, argv[2], &bool)) {


		    Tcl_AppendResult(interp,
			"wrong # args: should be a boolean value.",
			(char*) NULL);
		    return TCL_ERROR;
		} else {
		    tclrl_use_builtin_completer = bool;
		}
	    }
	    Tcl_AppendResult(interp, tclrl_use_builtin_completer ? "1" : "0",
		(char*) NULL);
	    break;

	case TCLRL_EOFCHAR:
	    if (argc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?script?");
		return TCL_ERROR;
	    } else if (3 == argc) {
		if (tclrl_eof_string)
		    FREE(tclrl_eof_string);
		if (!blank_line(argv[2]))
		    tclrl_eof_string = stripwhite(strdup(argv[2]));

	    }
	    Tcl_AppendResult(interp, tclrl_eof_string, (char*) NULL);
	    break;

	case TCLRL_RESET_TERMINAL:
	    /* TODO: add this to the completer */
	    if (argc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?terminal-name?");
		return TCL_ERROR;
	    }
	    if (3 == argc) {
		/*
		 * - tcl8.0 doesn't have Tcl_GetString()
		 * - rl_reset_terminal() might be defined
		 *   to take no arguments. This might produce
		 *   a compiler warning.
		 */
		rl_reset_terminal(Tcl_GetStringFromObj(objv[2], (int*) NULL));
#ifdef CLEANUP_AFER_SIGNAL
	    } else {
		rl_cleanup_after_signal();
#endif
	    }
	    break;

	case TCLRL_BELL:






	    /*
	     * ring the terminal bell obeying the current
	     * settings -- audible or visible.
	     */

	    ding();
	    break;



























	default:
	    goto BAD_COMMAND;
	    /* NOTREACHED */
	    break;
    }

................................................................................
    return Tclreadline_Init(interp);
}

int
Tclreadline_Init(Tcl_Interp *interp)
{
    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",







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/* forward declarations. */
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 objc,
                   Tcl_Obj *CONST objv[]);
static void TclReadlineReadHandler(ClientData clientData, int mask);
static void TclReadlineLineCompleteHandler(char* ptr);
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);
................................................................................
	}
	Tcl_DStringAppend(&result, ptr, 1);
    }
    result_c = strdup(Tcl_DStringValue(&result));
    return result_c;
}

static int TclReadlineCmd(ClientData clientData, Tcl_Interp *interp, int objc,
			  Tcl_Obj *CONST objv[])





{
    int i, obj_idx, status;


    static char *subCmds[] = {
	"read", "initialize", "write", "add", "complete",
	"customcompleter", "builtincompleter", "eofchar",
	"reset-terminal", "bell", "text", "update",
	(char *) NULL
    };
    enum SubCmdIdx {
	TCLRL_READ, TCLRL_INITIALIZE, TCLRL_WRITE, TCLRL_ADD, TCLRL_COMPLETE,
	TCLRL_CUSTOMCOMPLETER, TCLRL_BUILTINCOMPLETER, TCLRL_EOFCHAR,
	TCLRL_RESET_TERMINAL, TCLRL_BELL, TCLRL_TEXT, TCLRL_UPDATE
    };


    Tcl_ResetResult(interp); /* clear the result space */








    if (objc < 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "option ?arg arg ...?");
	return TCL_ERROR;
    }

    status = Tcl_GetIndexFromObj
    (interp, objv[1], subCmds, "option", 0, (int *) &obj_idx);

    if (status != TCL_OK) {

	return status;
    }

    switch (obj_idx) {

	case TCLRL_READ:

	    rl_callback_handler_install(
			       objc == 3 ? Tcl_GetStringFromObj(objv[2], 0)
			       : "%", TclReadlineLineCompleteHandler);

	    Tcl_CreateFileHandler(0, TCL_READABLE,
		TclReadlineReadHandler, (ClientData) NULL);

	    /**
	     * Main Loop.
	     * XXX each modification of the global variables
................................................................................
		    return tclrl_state;
		    /* NOTREACHED */
		    break;
	    }
	    break;

	case TCLRL_INITIALIZE:
	    if (3 != objc) {
		Tcl_WrongNumArgs(interp, 2, objv, "historyfile");
		return TCL_ERROR;
	    } else {
		return TclReadlineInitialize(interp,
					     Tcl_GetStringFromObj(objv[2], 0));
	    }
	    break;

	case TCLRL_WRITE:
	    if (3 != objc) {
		Tcl_WrongNumArgs(interp, 2, objv, "historyfile");
		return TCL_ERROR;
	    }  else if (write_history(Tcl_GetStringFromObj(objv[2], 0))) {
		Tcl_AppendResult(interp, "unable to write history to `",
		    Tcl_GetStringFromObj(objv[2], 0), "'\n", (char*) NULL);
		return TCL_ERROR;
	    }
	    if (tclrl_history_length >= 0) {
		history_truncate_file(Tcl_GetStringFromObj(objv[2], 0),
				      tclrl_history_length);
	    }
	    return TCL_OK;
	    break;

	case TCLRL_ADD:
	    if (3 != objc) {
		Tcl_WrongNumArgs(interp, 2, objv, "completerLine");
		return TCL_ERROR;
	    } else if (TclReadlineKnownCommands(
				     Tcl_GetStringFromObj(objv[2], 0),
				     (int) 0, _CMD_SET)) {
		Tcl_AppendResult(interp, "unable to add command \"",
		    Tcl_GetStringFromObj(objv[2], 0), "\"\n", (char*) NULL);
	    }
	    break;

	case TCLRL_COMPLETE:
	    if (3 != objc) {
		Tcl_WrongNumArgs(interp, 2, objv, "line");
		return TCL_ERROR;
	    } else if (Tcl_CommandComplete(Tcl_GetStringFromObj(objv[2], 0))) {
		Tcl_AppendResult(interp, "1", (char*) NULL);
	    } else {
		Tcl_AppendResult(interp, "0", (char*) NULL);
	    }
	    break;

	case TCLRL_CUSTOMCOMPLETER:
	    if (objc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?scriptCompleter?");
		return TCL_ERROR;
	    } else if (3 == objc) {
		if (tclrl_custom_completer)
		    FREE(tclrl_custom_completer);
		if (!blank_line(Tcl_GetStringFromObj(objv[2], 0)))
		    tclrl_custom_completer =
		         stripwhite(strdup(Tcl_GetStringFromObj(objv[2], 0)));
	    }
	    Tcl_AppendResult(interp, tclrl_custom_completer, (char*) NULL);
	    break;

	case TCLRL_BUILTINCOMPLETER:
	    if (objc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?boolean?");
		return TCL_ERROR;
	    } else if (3 == objc) {
		int bool = tclrl_use_builtin_completer;
		if (TCL_OK != Tcl_GetBoolean(interp,
					     Tcl_GetStringFromObj(objv[2], 0),
					     &bool)) {
		    Tcl_AppendResult(interp,
			"wrong # args: should be a boolean value.",
			(char*) NULL);
		    return TCL_ERROR;
		} else {
		    tclrl_use_builtin_completer = bool;
		}
	    }
	    Tcl_AppendResult(interp, tclrl_use_builtin_completer ? "1" : "0",
		(char*) NULL);
	    break;

	case TCLRL_EOFCHAR:
	    if (objc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?script?");
		return TCL_ERROR;
	    } else if (3 == objc) {
		if (tclrl_eof_string)
		    FREE(tclrl_eof_string);
		if (!blank_line(Tcl_GetStringFromObj(objv[2], 0)))
		    tclrl_eof_string = 
		        stripwhite(strdup(Tcl_GetStringFromObj(objv[2], 0)));
	    }
	    Tcl_AppendResult(interp, tclrl_eof_string, (char*) NULL);
	    break;

	case TCLRL_RESET_TERMINAL:
	    /* TODO: add this to the completer */
	    if (objc > 3) {
		Tcl_WrongNumArgs(interp, 2, objv, "?terminal-name?");
		return TCL_ERROR;
	    }
	    if (3 == objc) {
		/*
		 * - tcl8.0 doesn't have Tcl_GetStringFromObj()
		 * - rl_reset_terminal() might be defined
		 *   to take no arguments. This might produce
		 *   a compiler warning.
		 */
		rl_reset_terminal(Tcl_GetStringFromObj(objv[2], 0));
#ifdef CLEANUP_AFER_SIGNAL
	    } else {
		rl_cleanup_after_signal();
#endif
	    }
	    break;

	case TCLRL_BELL:
	    if (objc != 2) {
		Tcl_WrongNumArgs(interp, 2, objv, "");
		return TCL_ERROR;
	    }


	    /*
	     * ring the terminal bell obeying the current
	     * settings -- audible or visible.
	     */

	    ding();
	    break;

        case TCLRL_UPDATE:
	    if (objc != 2) {
		Tcl_WrongNumArgs(interp, 2, objv, "");
		return TCL_ERROR;
	    }

	    /* Update the input line */

	    if (rl_line_buffer) {
	        rl_forced_update_display();
	    }

	    break;


        case TCLRL_TEXT:
	    if (objc != 2) {
		Tcl_WrongNumArgs(interp, 2, objv, "");
		return TCL_ERROR;
	    }

	    /* Return the current input line */
	    Tcl_SetObjResult(interp,
		   Tcl_NewStringObj(rl_line_buffer ? rl_line_buffer : "", -1));
	    break;

	default:
	    goto BAD_COMMAND;
	    /* NOTREACHED */
	    break;
    }

................................................................................
    return Tclreadline_Init(interp);
}

int
Tclreadline_Init(Tcl_Interp *interp)
{
    int status;
    Tcl_CreateObjCommand(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",