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

    FILE: "/diska/home/joze/src/tclreadline/tclreadline.c"
    LAST MODIFICATION: "Fri Aug 20 18:14:57 1999 (joze)"
    (C) 1998, 1999 by Johannes Zellner, <johannes@zellner.org>
    $Id$
    ---

    tclreadline -- gnu readline for tcl
    Copyright (C) 1999  Johannes Zellner

char** TclReadlineCompletion	(char *text, int start, int end);
char*  TclReadline0generator	(char *text, int state);
char*  TclReadline1generator	(char *text, int state);
char*  TclReadlineKnownCommands	(char *text, int state, int mode);
int    TclReadlineEventHook	(void);
int    TclReadlineParse	(char **args, int maxargs, char *buf);

enum { 
    LINE_PENDING,
    LINE_CONTROL_D,
    LINE_COMPLETE
};

static int line_complete = LINE_PENDING;
static char *line = (char *) NULL;


/*
 * Script to set the tclreadline library path in the
 * variable global "tclreadline_library"
 */

    if (c == 'r'  && strncmp (argv[1], "read", length) == 0) {
        
        char *expansion = (char *) NULL;
        int status;
        
        line_complete = LINE_PENDING;
        rl_callback_handler_install (argc == 3 ? argv[2] : "%",
                TclReadlineLineCompleteHandler);

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

        while (LINE_PENDING == line_complete) {
            Tcl_DoOneEvent (0);
        }

        Tcl_DeleteFileHandler (0);

	if (LINE_CONTROL_D == line_complete) {
	    Tcl_Eval (interp, "puts {}; exit");
	}

        status = history_expand (line, &expansion);
        if (status == 1)
            printf ("%s\n", expansion);
        else if (status == -1)
            Tcl_AppendResult (interp, "error in history expansion\n",
                    (char *) NULL);
        
        if (expansion && *expansion)
            add_history (expansion);

        Tcl_AppendResult (interp, expansion, (char *) NULL);

        FREE (line);
        FREE (expansion);
        return TCL_OK;

    }
    else if (c == 'i'  && strncmp (argv[1], "initialize", length) == 0) {
        if (argc != 3)
            goto BAD_COMMAND;
        else
            Tcl_AppendResult (interp, TclReadlineInitialize (argv[2]),
                    (char *) NULL);

    return TCL_OK;

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

}

void TclReadlineDataAvailableHandler (ClientData clientData, int mask)
{
#if 1
    fprintf (stderr, "(TclReadlineDataAvailableHandler) mask = %d\n",  mask);
#endif
    if (mask & TCL_READABLE) {
        rl_callback_read_char ();
        rl_redisplay ();
    }
}

void TclReadlineLineCompleteHandler (char *ptr)
{
#if 0
    fprintf (stderr, "(TclReadlineLineCompleteHandler)  ptr = %p\n",  ptr);
    if (ptr)
    fprintf (stderr, "(TclReadlineLineCompleteHandler) *ptr = %p\n", *ptr);
#endif
    if (!ptr) { /* <c-d> */
        line_complete = LINE_CONTROL_D;
        rl_callback_handler_remove ();
    } else if (*ptr) {
        line_complete = LINE_COMPLETE;
        rl_callback_handler_remove ();
        line = ptr;
    }
}


int Tclreadline_SafeInit (Tcl_Interp *interp)
{
    return Tclreadline_Init (interp);
}

int Tclreadline_Init (Tcl_Interp *interp)
{
    Tcl_CreateCommand (interp, "::tclreadline::readline", TclReadlineCmd,
	    (ClientData) NULL, (Tcl_CmdDeleteProc *) NULL);
    return Tcl_PkgProvide (interp, "tclreadline", TCLREADLINE_VERSION);
}

char *TclReadlineInitialize (char *historyfile)
{

    rl_readline_name = "tclreadline";
    using_history ();

    /*
     * try to read historyfile in home
     * directory. If this failes, this
     * is *not* an error.
     */
    rl_attempted_completion_function = (CPPFunction *) TclReadlineCompletion;
    if (read_history (historyfile))
        return "unable to read history file";
    
    else
        return "";
}

char **TclReadlineCompletion (char *text, int start, int end)
{
    char **matches = (char **) NULL;
    static char local_line[BUFSIZ];
       

    */

    if (start == 0 || !strlen (local_line))
        matches = completion_matches (text, TclReadline0generator);
    else
        matches = completion_matches (text, TclReadline1generator);
    
    return matches;
}

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

char *TclReadline1generator (char *text, int state)
{
    return TclReadlineKnownCommands (text, state, _CMD_SUB_GET);
}

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

                new = cmds;
                len = strlen (text);
            }

            while (new && (name = new->cmd)) {
                new = new->next;
                if (!strncmp (name[0], text, len))
                    return strdup (name[0]);
            }

            return (char *) NULL;
            break;

        case _CMD_SUB_GET:
            

                
                if (!new)
                    return (char *) NULL;

                for (i = 0; new->cmd[i]; i++) /* EMPTY */;

                if (sub < i && !strncmp (new->cmd[sub], text, len))
                    return strdup (new->cmd[sub]);
                else
                   return (char *) NULL;

            }
            else
                return (char *) NULL;

    /* NOTREACHED */

}

int TclReadlineEventHook (void)
{
    Tcl_DoOneEvent (TCL_ALL_EVENTS | TCL_DONT_WAIT);
    return TCL_OK;
}

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

    while (*buf != '\0' && nr < maxargs) {