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/*

 * tkConsole.c --

 *

 *      This file implements a Tcl console for systems that may not

 *      otherwise have access to a console.  It uses the Text widget

 *      and provides special access via a console command.

 *

 * Copyright (c) 1995-1996 Sun Microsystems, Inc.

 *

 * See the file "license.terms" for information on usage and redistribution

 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.

 *

 * SCCS: @(#) tkConsole.c 1.51 97/04/25 16:52:39

 */

#include "tkInt.h"

/*

 * A data structure of the following type holds information for each console

 * which a handler (i.e. a Tcl command) has been defined for a particular

 * top-level window.

 */

typedef struct ConsoleInfo {

    Tcl_Interp *consoleInterp;  /* Interpreter for the console. */

    Tcl_Interp *interp;         /* Interpreter to send console commands. */

} ConsoleInfo;

static Tcl_Interp *gStdoutInterp = NULL;

/*

 * Forward declarations for procedures defined later in this file:

 */

static int      ConsoleCmd _ANSI_ARGS_((ClientData clientData,

                    Tcl_Interp *interp, int argc, char **argv));

static void     ConsoleDeleteProc _ANSI_ARGS_((ClientData clientData));

static void     ConsoleEventProc _ANSI_ARGS_((ClientData clientData,

                    XEvent *eventPtr));

static int      InterpreterCmd _ANSI_ARGS_((ClientData clientData,

                    Tcl_Interp *interp, int argc, char **argv));

static int      ConsoleInput _ANSI_ARGS_((ClientData instanceData,

                    char *buf, int toRead, int *errorCode));

static int      ConsoleOutput _ANSI_ARGS_((ClientData instanceData,

                    char *buf, int toWrite, int *errorCode));

static int      ConsoleClose _ANSI_ARGS_((ClientData instanceData,

                    Tcl_Interp *interp));

static void     ConsoleWatch _ANSI_ARGS_((ClientData instanceData,

                    int mask));

static int      ConsoleHandle _ANSI_ARGS_((ClientData instanceData,

                    int direction, ClientData *handlePtr));

void TkConsolePrint (Tcl_Interp *interp, int devId, char *buffer, long size);                   /* Size of text buffer. */

/*

 * This structure describes the channel type structure for file based IO:

 */

static Tcl_ChannelType consoleChannelType = {

    "console",                  /* Type name. */

    NULL,                       /* Always non-blocking.*/

    ConsoleClose,               /* Close proc. */

    ConsoleInput,               /* Input proc. */

    ConsoleOutput,              /* Output proc. */

    NULL,                       /* Seek proc. */

    NULL,                       /* Set option proc. */

    NULL,                       /* Get option proc. */

    ConsoleWatch,               /* Watch for events on console. */

    ConsoleHandle,              /* Get a handle from the device. */

};

/*

 *----------------------------------------------------------------------

 *

 * TkConsoleCreate --

 *

 *      Create the console channels and install them as the standard

 *      channels.  All I/O will be discarded until TkConsoleInit is

 *      called to attach the console to a text widget.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      Creates the console channel and installs it as the standard

 *      channels.

 *

 *----------------------------------------------------------------------

 */

void

TkConsoleCreate()

{

    Tcl_Channel consoleChannel;

    TclInitSubsystems(NULL);

    consoleChannel = Tcl_CreateChannel(&consoleChannelType, "console0",

            (ClientData) TCL_STDIN, TCL_READABLE);

    if (consoleChannel != NULL) {

        Tcl_SetChannelOption(NULL, consoleChannel, "-translation", "lf");

        Tcl_SetChannelOption(NULL, consoleChannel, "-buffering", "none");

    }

    Tcl_SetStdChannel(consoleChannel, TCL_STDIN);

    consoleChannel = Tcl_CreateChannel(&consoleChannelType, "console1",

            (ClientData) TCL_STDOUT, TCL_WRITABLE);

    if (consoleChannel != NULL) {

        Tcl_SetChannelOption(NULL, consoleChannel, "-translation", "lf");

        Tcl_SetChannelOption(NULL, consoleChannel, "-buffering", "none");

    }

    Tcl_SetStdChannel(consoleChannel, TCL_STDOUT);

    consoleChannel = Tcl_CreateChannel(&consoleChannelType, "console2",

            (ClientData) TCL_STDERR, TCL_WRITABLE);

    if (consoleChannel != NULL) {

        Tcl_SetChannelOption(NULL, consoleChannel, "-translation", "lf");

        Tcl_SetChannelOption(NULL, consoleChannel, "-buffering", "none");

    }

    Tcl_SetStdChannel(consoleChannel, TCL_STDERR);

}

/*

 *----------------------------------------------------------------------

 *

 * TkConsoleInit --

 *

 *      Initialize the console.  This code actually creates a new

 *      application and associated interpreter.  This effectivly hides

 *      the implementation from the main application.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      A new console it created.

 *

 *----------------------------------------------------------------------

 */

int

TkConsoleInit(interp)

    Tcl_Interp *interp;                 /* Interpreter to use for prompting. */

{

    Tcl_Interp *consoleInterp;

    ConsoleInfo *info;

    Tk_Window mainWindow = Tk_MainWindow(interp);

#ifdef MAC_TCL

    static char initCmd[] = "source -rsrc {Console}";

#else

    static char initCmd[] = "source $tk_library/console.tcl";

#endif

    consoleInterp = Tcl_CreateInterp();

    if (consoleInterp == NULL) {

        goto error;

    }

    /*

     * Initialized Tcl and Tk.

     */

    if (Tcl_Init(consoleInterp) != TCL_OK) {

        goto error;

    }

    if (Tk_Init(consoleInterp) != TCL_OK) {

        goto error;

    }

    gStdoutInterp = interp;

    /*

     * Add console commands to the interp

     */

    info = (ConsoleInfo *) ckalloc(sizeof(ConsoleInfo));

    info->interp = interp;

    info->consoleInterp = consoleInterp;

    Tcl_CreateCommand(interp, "console", ConsoleCmd, (ClientData) info,

            (Tcl_CmdDeleteProc *) ConsoleDeleteProc);

    Tcl_CreateCommand(consoleInterp, "consoleinterp", InterpreterCmd,

            (ClientData) info, (Tcl_CmdDeleteProc *) NULL);

    Tk_CreateEventHandler(mainWindow, StructureNotifyMask, ConsoleEventProc,

            (ClientData) info);

    Tcl_Preserve((ClientData) consoleInterp);

    if (Tcl_Eval(consoleInterp, initCmd) == TCL_ERROR) {

        /* goto error; -- no problem for now... */

        printf("Eval error: %s", consoleInterp->result);

    }

    Tcl_Release((ClientData) consoleInterp);

    return TCL_OK;

    error:

    if (consoleInterp != NULL) {

        Tcl_DeleteInterp(consoleInterp);

    }

    return TCL_ERROR;

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleOutput--

 *

 *      Writes the given output on the IO channel. Returns count of how

 *      many characters were actually written, and an error indication.

 *

 * Results:

 *      A count of how many characters were written is returned and an

 *      error indication is returned in an output argument.

 *

 * Side effects:

 *      Writes output on the actual channel.

 *

 *----------------------------------------------------------------------

 */

static int

ConsoleOutput(instanceData, buf, toWrite, errorCode)

    ClientData instanceData;            /* Indicates which device to use. */

    char *buf;                          /* The data buffer. */

    int toWrite;                        /* How many bytes to write? */

    int *errorCode;                     /* Where to store error code. */

{

    *errorCode = 0;

    Tcl_SetErrno(0);

    if (gStdoutInterp != NULL) {

        TkConsolePrint(gStdoutInterp, (int) instanceData, buf, toWrite);

    }

    return toWrite;

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleInput --

 *

 *      Read input from the console.  Not currently implemented.

 *

 * Results:

 *      Always returns EOF.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

        /* ARGSUSED */

static int

ConsoleInput(instanceData, buf, bufSize, errorCode)

    ClientData instanceData;            /* Unused. */

    char *buf;                          /* Where to store data read. */

    int bufSize;                        /* How much space is available

                                         * in the buffer? */

    int *errorCode;                     /* Where to store error code. */

{

    return 0;                    /* Always return EOF. */

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleClose --

 *

 *      Closes the IO channel.

 *

 * Results:

 *      Always returns 0 (success).

 *

 * Side effects:

 *      Frees the dummy file associated with the channel.

 *

 *----------------------------------------------------------------------

 */

        /* ARGSUSED */

static int

ConsoleClose(instanceData, interp)

    ClientData instanceData;    /* Unused. */

    Tcl_Interp *interp;         /* Unused. */

{

    return 0;

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleWatch --

 *

 *      Called by the notifier to set up the console device so that

 *      events will be noticed. Since there are no events on the

 *      console, this routine just returns without doing anything.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

        /* ARGSUSED */

static void

ConsoleWatch(instanceData, mask)

    ClientData instanceData;            /* Device ID for the channel. */

    int mask;                           /* OR-ed combination of

                                         * TCL_READABLE, TCL_WRITABLE and

                                         * TCL_EXCEPTION, for the events

                                         * we are interested in. */

{

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleHandle --

 *

 *      Invoked by the generic IO layer to get a handle from a channel.

 *      Because console channels are not devices, this function always

 *      fails.

 *

 * Results:

 *      Always returns TCL_ERROR.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

        /* ARGSUSED */

static int

ConsoleHandle(instanceData, direction, handlePtr)

    ClientData instanceData;    /* Device ID for the channel. */

    int direction;              /* TCL_READABLE or TCL_WRITABLE to indicate

                                 * which direction of the channel is being

                                 * requested. */

    ClientData *handlePtr;      /* Where to store handle */

{

    return TCL_ERROR;

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleCmd --

 *

 *      The console command implements a Tcl interface to the various console

 *      options.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

static int

ConsoleCmd(clientData, interp, argc, argv)

    ClientData clientData;              /* Not used. */

    Tcl_Interp *interp;                 /* Current interpreter. */

    int argc;                           /* Number of arguments. */

    char **argv;                        /* Argument strings. */

{

    ConsoleInfo *info = (ConsoleInfo *) clientData;

    char c;

    int length;

    int result;

    Tcl_Interp *consoleInterp;

    if (argc < 2) {

        Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],

                " option ?arg arg ...?\"", (char *) NULL);

        return TCL_ERROR;

    }

    c = argv[1][0];

    length = strlen(argv[1]);

    result = TCL_OK;

    consoleInterp = info->consoleInterp;

    Tcl_Preserve((ClientData) consoleInterp);

    if ((c == 't') && (strncmp(argv[1], "title", length)) == 0) {

        Tcl_DString dString;

        Tcl_DStringInit(&dString);

        Tcl_DStringAppend(&dString, "wm title . ", -1);

        if (argc == 3) {

            Tcl_DStringAppendElement(&dString, argv[2]);

        }

        Tcl_Eval(consoleInterp, Tcl_DStringValue(&dString));

        Tcl_DStringFree(&dString);

    } else if ((c == 'h') && (strncmp(argv[1], "hide", length)) == 0) {

        Tcl_Eval(info->consoleInterp, "wm withdraw .");

    } else if ((c == 's') && (strncmp(argv[1], "show", length)) == 0) {

        Tcl_Eval(info->consoleInterp, "wm deiconify .");

    } else if ((c == 'e') && (strncmp(argv[1], "eval", length)) == 0) {

        if (argc == 3) {

            Tcl_Eval(info->consoleInterp, argv[2]);

        } else {

            Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],

                    " eval command\"", (char *) NULL);

            return TCL_ERROR;

        }

    } else {

        Tcl_AppendResult(interp, "bad option \"", argv[1],

                "\": should be hide, show, or title",

                (char *) NULL);

        result = TCL_ERROR;

    }

    Tcl_Release((ClientData) consoleInterp);

    return result;

}

/*

 *----------------------------------------------------------------------

 *

 * InterpreterCmd --

 *

 *      This command allows the console interp to communicate with the

 *      main interpreter.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

static int

InterpreterCmd(clientData, interp, argc, argv)

    ClientData clientData;              /* Not used. */

    Tcl_Interp *interp;                 /* Current interpreter. */

    int argc;                           /* Number of arguments. */

    char **argv;                        /* Argument strings. */

{

    ConsoleInfo *info = (ConsoleInfo *) clientData;

    char c;

    int length;

    int result;

    Tcl_Interp *otherInterp;

    if (argc < 2) {

        Tcl_AppendResult(interp, "wrong # args: should be \"", argv[0],

                " option ?arg arg ...?\"", (char *) NULL);

        return TCL_ERROR;

    }

    c = argv[1][0];

    length = strlen(argv[1]);

    otherInterp = info->interp;

    Tcl_Preserve((ClientData) otherInterp);

    if ((c == 'e') && (strncmp(argv[1], "eval", length)) == 0) {

        result = Tcl_GlobalEval(otherInterp, argv[2]);

        Tcl_AppendResult(interp, otherInterp->result, (char *) NULL);

    } else if ((c == 'r') && (strncmp(argv[1], "record", length)) == 0) {

        Tcl_RecordAndEval(otherInterp, argv[2], TCL_EVAL_GLOBAL);

        result = TCL_OK;

        Tcl_AppendResult(interp, otherInterp->result, (char *) NULL);

    } else {

        Tcl_AppendResult(interp, "bad option \"", argv[1],

                "\": should be eval or record",

                (char *) NULL);

        result = TCL_ERROR;

    }

    Tcl_Release((ClientData) otherInterp);

    return result;

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleDeleteProc --

 *

 *      If the console command is deleted we destroy the console window

 *      and all associated data structures.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      A new console it created.

 *

 *----------------------------------------------------------------------

 */

void

ConsoleDeleteProc(clientData)

    ClientData clientData;

{

    ConsoleInfo *info = (ConsoleInfo *) clientData;

    Tcl_DeleteInterp(info->consoleInterp);

    info->consoleInterp = NULL;

}

/*

 *----------------------------------------------------------------------

 *

 * ConsoleEventProc --

 *

 *      This event procedure is registered on the main window of the

 *      slave interpreter.  If the user or a running script causes the

 *      main window to be destroyed, then we need to inform the console

 *      interpreter by invoking "tkConsoleExit".

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      Invokes the "tkConsoleExit" procedure in the console interp.

 *

 *----------------------------------------------------------------------

 */

static void

ConsoleEventProc(clientData, eventPtr)

    ClientData clientData;

    XEvent *eventPtr;

{

    ConsoleInfo *info = (ConsoleInfo *) clientData;

    Tcl_Interp *consoleInterp;

    if (eventPtr->type == DestroyNotify) {

        consoleInterp = info->consoleInterp;

        /*

         * It is possible that the console interpreter itself has

         * already been deleted. In that case the consoleInterp

         * field will be set to NULL. If the interpreter is already

         * gone, we do not have to do any work here.

         */

        if (consoleInterp == (Tcl_Interp *) NULL) {

            return;

        }

        Tcl_Preserve((ClientData) consoleInterp);

        Tcl_Eval(consoleInterp, "tkConsoleExit");

        Tcl_Release((ClientData) consoleInterp);

    }

}

/*

 *----------------------------------------------------------------------

 *

 * TkConsolePrint --

 *

 *      Prints to the give text to the console.  Given the main interp

 *      this functions find the appropiate console interp and forwards

 *      the text to be added to that console.

 *

 * Results:

 *      None.

 *

 * Side effects:

 *      None.

 *

 *----------------------------------------------------------------------

 */

void

TkConsolePrint(interp, devId, buffer, size)

    Tcl_Interp *interp;         /* Main interpreter. */

    int devId;                  /* TCL_STDOUT for stdout, TCL_STDERR for

                                 * stderr. */

    char *buffer;               /* Text buffer. */

    long size;                  /* Size of text buffer. */

{

    Tcl_DString command, output;

    Tcl_CmdInfo cmdInfo;

    char *cmd;

    ConsoleInfo *info;

    Tcl_Interp *consoleInterp;

    int result;

    if (interp == NULL) {

        return;

    }

    if (devId == TCL_STDERR) {

        cmd = "tkConsoleOutput stderr ";

    } else {

        cmd = "tkConsoleOutput stdout ";

    }

    result = Tcl_GetCommandInfo(interp, "console", &cmdInfo);

    if (result == 0) {

        return;

    }

    info = (ConsoleInfo *) cmdInfo.clientData;

    Tcl_DStringInit(&output);

    Tcl_DStringAppend(&output, buffer, size);

    Tcl_DStringInit(&command);

    Tcl_DStringAppend(&command, cmd, strlen(cmd));

    Tcl_DStringAppendElement(&command, output.string);

    consoleInterp = info->consoleInterp;

    Tcl_Preserve((ClientData) consoleInterp);

    Tcl_Eval(consoleInterp, command.string);

    Tcl_Release((ClientData) consoleInterp);

    Tcl_DStringFree(&command);

    Tcl_DStringFree(&output);

}