/* * 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 1.53 97/07/22 16:36:55 */ #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: * * The first three will be used in the tk app shells... */ void TkConsoleCreate _ANSI_ARGS_((void)); int TkConsoleInit _ANSI_ARGS_((Tcl_Interp *interp)); void TkConsolePrint _ANSI_ARGS_((Tcl_Interp *interp, int devId, char *buffer, long size)); 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)); /* * 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; 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); }