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- /*
- * main.c --
- *
- * This file contains the main program for "wish", a windowing
- * shell based on Tk and Tcl. It also provides a template that
- * can be used as the basis for main programs for other Tk
- * applications.
- *
- * Copyright (c) 1990-1993 The Regents of the University of California.
- * All rights reserved.
- *
- * Permission is hereby granted, without written agreement and without
- * license or royalty fees, to use, copy, modify, and distribute this
- * software and its documentation for any purpose, provided that the
- * above copyright notice and the following two paragraphs appear in
- * all copies of this software.
- *
- * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
- * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
- * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
- * CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
- * ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
- * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
- */
-
- #ifndef lint
- static char rcsid[] = "$Header: /user6/ouster/wish/RCS/tkMain.c,v 1.82 93/07/09 09:52:37 ouster Exp $ SPRITE (Berkeley)";
- #endif
-
- #include "tkConfig.h"
- #include "tkInt.h"
-
- /*
- * Declarations for library procedures:
- */
-
- extern int isatty();
-
- /*
- * Global variables used by the main program:
- */
-
- static Tk_Window w; /* The main window for the application. If
- * NULL then the application no longer
- * exists. */
- static Tcl_Interp *interp; /* Interpreter for this application. */
- static Tcl_DString command; /* Used to assemble lines of terminal input
- * into Tcl commands. */
- static int tty; /* Non-zero means standard input is a
- * terminal-like device. Zero means it's
- * a file. */
-
- /*
- * Command-line options:
- */
-
- int synchronize = 0;
- char *fileName = NULL;
- char *name = NULL;
- char *display = NULL;
- char *geometry = NULL;
-
- Tk_ArgvInfo argTable[] = {
- {"-file", TK_ARGV_STRING, (char *) NULL, (char *) &fileName,
- "File from which to read commands"},
- {"-geometry", TK_ARGV_STRING, (char *) NULL, (char *) &geometry,
- "Initial geometry for window"},
- {"-display", TK_ARGV_STRING, (char *) NULL, (char *) &display,
- "Display to use"},
- {"-name", TK_ARGV_STRING, (char *) NULL, (char *) &name,
- "Name to use for application"},
- {"-sync", TK_ARGV_CONSTANT, (char *) 1, (char *) &synchronize,
- "Use synchronous mode for display server"},
- {(char *) NULL, TK_ARGV_END, (char *) NULL, (char *) NULL,
- (char *) NULL}
- };
-
- /*
- * Declaration for Tcl command procedure to create demo widget. This
- * procedure is only invoked if SQUARE_DEMO is defined.
- */
-
- extern int SquareCmd _ANSI_ARGS_((ClientData clientData,
- Tcl_Interp *interp, int argc, char *argv[]));
-
- /*
- * Forward declarations for procedures defined later in this file:
- */
-
- static void DelayedMap _ANSI_ARGS_((ClientData clientData));
- static void StdinProc _ANSI_ARGS_((ClientData clientData,
- int mask));
- static void StructureProc _ANSI_ARGS_((ClientData clientData,
- XEvent *eventPtr));
-
- /*
- *----------------------------------------------------------------------
- *
- * main --
- *
- * Main program for Wish.
- *
- * Results:
- * None. This procedure never returns (it exits the process when
- * it's done
- *
- * Side effects:
- * This procedure initializes the wish world and then starts
- * interpreting commands; almost anything could happen, depending
- * on the script being interpreted.
- *
- *----------------------------------------------------------------------
- */
-
- int
- main(argc, argv)
- int argc; /* Number of arguments. */
- char **argv; /* Array of argument strings. */
- {
- char *args, *p, *msg;
- char buf[20];
- int result;
- Tk_3DBorder border;
-
- interp = Tcl_CreateInterp();
- #ifdef TCL_MEM_DEBUG
- Tcl_InitMemory(interp);
- #endif
-
- /*
- * Parse command-line arguments.
- */
-
- if (Tk_ParseArgv(interp, (Tk_Window) NULL, &argc, argv, argTable, 0)
- != TCL_OK) {
- fprintf(stderr, "%s\n", interp->result);
- exit(1);
- }
- if (name == NULL) {
- if (fileName != NULL) {
- p = fileName;
- } else {
- p = argv[0];
- }
- name = strrchr(p, '/');
- if (name != NULL) {
- name++;
- } else {
- name = p;
- }
- }
-
- /*
- * Initialize the Tk application and arrange to map the main window
- * after the startup script has been executed, if any. This way
- * the script can withdraw the window so it isn't ever mapped
- * at all.
- */
-
- w = Tk_CreateMainWindow(interp, display, name);
- if (w == NULL) {
- fprintf(stderr, "%s\n", interp->result);
- exit(1);
- }
- Tk_SetClass(w, "Tk");
- Tk_CreateEventHandler(w, StructureNotifyMask, StructureProc,
- (ClientData) NULL);
- Tk_DoWhenIdle(DelayedMap, (ClientData) NULL);
- if (synchronize) {
- XSynchronize(Tk_Display(w), True);
- }
- Tk_GeometryRequest(w, 200, 200);
- border = Tk_Get3DBorder(interp, w, None, "#ffe4c4");
- if (border == NULL) {
- Tcl_SetResult(interp, (char *) NULL, TCL_STATIC);
- Tk_SetWindowBackground(w, WhitePixelOfScreen(Tk_Screen(w)));
- } else {
- Tk_SetBackgroundFromBorder(w, border);
- }
- XSetForeground(Tk_Display(w), DefaultGCOfScreen(Tk_Screen(w)),
- BlackPixelOfScreen(Tk_Screen(w)));
-
- /*
- * Make command-line arguments available in the Tcl variables "argc"
- * and "argv". Also set the "geometry" variable from the geometry
- * specified on the command line.
- */
-
- args = Tcl_Merge(argc-1, argv+1);
- Tcl_SetVar(interp, "argv", args, TCL_GLOBAL_ONLY);
- ckfree(args);
- sprintf(buf, "%d", argc-1);
- Tcl_SetVar(interp, "argc", buf, TCL_GLOBAL_ONLY);
- Tcl_SetVar(interp, "argv0", (fileName != NULL) ? fileName : argv[0],
- TCL_GLOBAL_ONLY);
- if (geometry != NULL) {
- Tcl_SetVar(interp, "geometry", geometry, TCL_GLOBAL_ONLY);
- }
-
- /*
- * Add a few application-specific commands to the application's
- * interpreter.
- */
-
- #ifdef SQUARE_DEMO
- Tcl_CreateCommand(interp, "square", SquareCmd, (ClientData) w,
- (void (*)()) NULL);
- #endif
-
- /*
- * Invoke application-specific initialization.
- */
-
- if (Tcl_AppInit(interp) != TCL_OK) {
- fprintf(stderr, "%s\n", interp->result);
- exit(1);
- }
-
- /*
- * Invoke the script specified on the command line, if any.
- */
-
- tty = isatty(0);
- if (fileName != NULL) {
- result = Tcl_VarEval(interp, "source ", fileName, (char *) NULL);
- if (result != TCL_OK) {
- goto error;
- }
- tty = 0;
- } else {
- /*
- * Commands will come from standard input. Set up a handler
- * to receive those characters and print a prompt if the input
- * device is a terminal.
- */
-
- Tk_CreateFileHandler(0, TK_READABLE, StdinProc, (ClientData) 0);
- if (tty) {
- printf("wish: ");
- }
- }
- fflush(stdout);
- Tcl_DStringInit(&command);
- (void) Tcl_Eval(interp, "update");
-
- /*
- * Loop infinitely, waiting for commands to execute. When there
- * are no windows left, Tk_MainLoop returns and we clean up and
- * exit.
- */
-
- Tk_MainLoop();
- Tcl_DeleteInterp(interp);
- Tcl_DStringFree(&command);
- exit(0);
-
- error:
- msg = Tcl_GetVar(interp, "errorInfo", TCL_GLOBAL_ONLY);
- if (msg == NULL) {
- msg = interp->result;
- }
- fprintf(stderr, "%s\n", msg);
- Tcl_Eval(interp, "destroy .");
- exit(1);
- return 0; /* Needed only to prevent compiler warnings. */
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * StdinProc --
- *
- * This procedure is invoked by the event dispatcher whenever
- * standard input becomes readable. It grabs the next line of
- * input characters, adds them to a command being assembled, and
- * executes the command if it's complete.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Could be almost arbitrary, depending on the command that's
- * typed.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- static void
- StdinProc(clientData, mask)
- ClientData clientData; /* Not used. */
- int mask; /* Not used. */
- {
- #define BUFFER_SIZE 4000
- char input[BUFFER_SIZE+1];
- static int gotPartial = 0;
- char *cmd;
- int result, count;
-
- count = read(fileno(stdin), input, BUFFER_SIZE);
- if (count <= 0) {
- if (!gotPartial) {
- if (tty) {
- Tcl_Eval(interp, "exit");
- exit(0);
- } else {
- Tk_DeleteFileHandler(0);
- }
- return;
- } else {
- count = 0;
- }
- }
- cmd = Tcl_DStringAppend(&command, input, count);
- if (count != 0) {
- if ((input[count-1] != '\n') && (input[count-1] != ';')) {
- gotPartial = 1;
- return;
- }
- if (!Tcl_CommandComplete(cmd)) {
- gotPartial = 1;
- return;
- }
- }
- gotPartial = 0;
-
- /*
- * Disable the stdin file handler; otherwise if the command
- * re-enters the event loop we might process commands from
- * stdin before the current command is finished. Among other
- * things, this will trash the text of the command being evaluated.
- */
-
- Tk_CreateFileHandler(0, 0, StdinProc, (ClientData) 0);
- result = Tcl_RecordAndEval(interp, cmd, 0);
- Tk_CreateFileHandler(0, TK_READABLE, StdinProc, (ClientData) 0);
- Tcl_DStringFree(&command);
- if (*interp->result != 0) {
- if ((result != TCL_OK) || (tty)) {
- printf("%s\n", interp->result);
- }
- }
- if (tty) {
- printf("wish: ");
- fflush(stdout);
- }
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * StructureProc --
- *
- * This procedure is invoked whenever a structure-related event
- * occurs on the main window. If the window is deleted, the
- * procedure modifies "w" to record that fact.
- *
- * Results:
- * None.
- *
- * Side effects:
- * Variable "w" may get set to NULL.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- static void
- StructureProc(clientData, eventPtr)
- ClientData clientData; /* Information about window. */
- XEvent *eventPtr; /* Information about event. */
- {
- if (eventPtr->type == DestroyNotify) {
- w = NULL;
- }
- }
-
- /*
- *----------------------------------------------------------------------
- *
- * DelayedMap --
- *
- * This procedure is invoked by the event dispatcher once the
- * startup script has been processed. It waits for all other
- * pending idle handlers to be processed (so that all the
- * geometry information will be correct), then maps the
- * application's main window.
- *
- * Results:
- * None.
- *
- * Side effects:
- * The main window gets mapped.
- *
- *----------------------------------------------------------------------
- */
-
- /* ARGSUSED */
- static void
- DelayedMap(clientData)
- ClientData clientData; /* Not used. */
- {
-
- while (Tk_DoOneEvent(TK_IDLE_EVENTS) != 0) {
- /* Empty loop body. */
- }
- if (w == NULL) {
- return;
- }
- Tk_MapWindow(w);
- }
-