/*
* tkMain.c --
*
* This file contains a generic main program for Tk-based applications.
* It can be used as-is for many applications, just by supplying a
* different appInitProc procedure for each specific application.
* Or, it can be used as a template for creating new main programs
* for Tk applications.
*
* Copyright (c) 1990-1994 The Regents of the University of California.
* Copyright (c) 1994-1996 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkMain.c,v 1.2 1998/09/14 18:23:14 stanton Exp $
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <tcl.h>
#include <tk.h>
#ifdef NO_STDLIB_H
# include "../compat/stdlib.h"
#else
# include <stdlib.h>
#endif
/*
* Declarations for various library procedures and variables (don't want
* to include tkInt.h or tkPort.h here, because people might copy this
* file out of the Tk source directory to make their own modified versions).
* Note: don't declare "exit" here even though a declaration is really
* needed, because it will conflict with a declaration elsewhere on
* some systems.
*/
extern int isatty _ANSI_ARGS_((int fd));
#if !defined(__WIN32__) && !defined(_WIN32)
extern char * strrchr _ANSI_ARGS_((CONST char *string, int c));
#endif
extern void TkpDisplayWarning _ANSI_ARGS_((char *msg,
char *title));
/*
* Global variables used by the main program:
*/
static Tcl_Interp *interp; /* Interpreter for this application. */
static Tcl_DString command; /* Used to assemble lines of terminal input
* into Tcl commands. */
static Tcl_DString line; /* Used to read the next line from the
* terminal input. */
static int tty; /* Non-zero means standard input is a
* terminal-like device. Zero means it's
* a file. */
/*
* Forward declarations for procedures defined later in this file.
*/
static void Prompt _ANSI_ARGS_((Tcl_Interp *interp, int partial));
static void StdinProc _ANSI_ARGS_((ClientData clientData,
int mask));
/*
*----------------------------------------------------------------------
*
* Tk_Main --
*
* Main program for Wish and most other Tk-based applications.
*
* Results:
* None. This procedure never returns (it exits the process when
* it's done.
*
* Side effects:
* This procedure initializes the Tk world and then starts
* interpreting commands; almost anything could happen, depending
* on the script being interpreted.
*
*----------------------------------------------------------------------
*/
void
Tk_Main(argc, argv, appInitProc)
int argc; /* Number of arguments. */
char **argv; /* Array of argument strings. */
Tcl_AppInitProc *appInitProc; /* Application-specific initialization
* procedure to call after most
* initialization but before starting
* to execute commands. */
{
char *args, *fileName;
char buf[20];
int code;
size_t length;
Tcl_Channel inChannel, outChannel;
Tcl_FindExecutable(argv[0]);
interp = Tcl_CreateInterp();
#ifdef TCL_MEM_DEBUG
Tcl_InitMemory(interp);
#endif
/*
* Parse command-line arguments. A leading "-file" argument is
* ignored (a historical relic from the distant past). If the
* next argument doesn't start with a "-" then strip it off and
* use it as the name of a script file to process.
*/
fileName = NULL;
if (argc > 1) {
length = strlen(argv[1]);
if ((length >= 2) && (strncmp(argv[1], "-file", length) == 0)) {
argc--;
argv++;
}
}
if ((argc > 1) && (argv[1][0] != '-')) {
fileName = argv[1];
argc--;
argv++;
}
/*
* Make command-line arguments available in the Tcl variables "argc"
* and "argv".
*/
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);
/*
* Set the "tcl_interactive" variable.
*/
/*
* For now, under Windows, we assume we are not running as a console mode
* app, so we need to use the GUI console. In order to enable this, we
* always claim to be running on a tty. This probably isn't the right
* way to do it.
*/
#ifdef __WIN32__
tty = 1;
#else
tty = isatty(0);
#endif
Tcl_SetVar(interp, "tcl_interactive",
((fileName == NULL) && tty) ? "1" : "0", TCL_GLOBAL_ONLY);
/*
* Invoke application-specific initialization.
*/
if ((*appInitProc)(interp) != TCL_OK) {
TkpDisplayWarning(interp->result, "Application initialization failed");
}
/*
* Invoke the script specified on the command line, if any.
*/
if (fileName != NULL) {
code = Tcl_EvalFile(interp, fileName);
if (code != TCL_OK) {
/*
* The following statement guarantees that the errorInfo
* variable is set properly.
*/
Tcl_AddErrorInfo(interp, "");
TkpDisplayWarning(Tcl_GetVar(interp, "errorInfo",
TCL_GLOBAL_ONLY), "Error in startup script");
Tcl_DeleteInterp(interp);
Tcl_Exit(1);
}
tty = 0;
} else {
/*
* Evaluate the .rc file, if one has been specified.
*/
Tcl_SourceRCFile(interp);
/*
* Establish a channel handler for stdin.
*/
inChannel = Tcl_GetStdChannel(TCL_STDIN);
if (inChannel) {
Tcl_CreateChannelHandler(inChannel, TCL_READABLE, StdinProc,
(ClientData) inChannel);
}
if (tty) {
Prompt(interp, 0);
}
}
outChannel = Tcl_GetStdChannel(TCL_STDOUT);
if (outChannel) {
Tcl_Flush(outChannel);
}
Tcl_DStringInit(&command);
Tcl_DStringInit(&line);
Tcl_ResetResult(interp);
/*
* Loop infinitely, waiting for commands to execute. When there
* are no windows left, Tk_MainLoop returns and we exit.
*/
Tk_MainLoop();
Tcl_DeleteInterp(interp);
Tcl_Exit(0);
}
/*
*----------------------------------------------------------------------
*
* 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. */
{
static int gotPartial = 0;
char *cmd;
int code, count;
Tcl_Channel chan = (Tcl_Channel) clientData;
count = Tcl_Gets(chan, &line);
if (count < 0) {
if (!gotPartial) {
if (tty) {
Tcl_Exit(0);
} else {
Tcl_DeleteChannelHandler(chan, StdinProc, (ClientData) chan);
}
return;
}
}
(void) Tcl_DStringAppend(&command, Tcl_DStringValue(&line), -1);
cmd = Tcl_DStringAppend(&command, "\n", -1);
Tcl_DStringFree(&line);
if (!Tcl_CommandComplete(cmd)) {
gotPartial = 1;
goto prompt;
}
gotPartial = 0;
/*
* Disable the stdin channel handler while evaluating the command;
* 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.
*/
Tcl_CreateChannelHandler(chan, 0, StdinProc, (ClientData) chan);
code = Tcl_RecordAndEval(interp, cmd, TCL_EVAL_GLOBAL);
chan = Tcl_GetStdChannel(TCL_STDIN);
if (chan) {
Tcl_CreateChannelHandler(chan, TCL_READABLE, StdinProc,
(ClientData) chan);
}
Tcl_DStringFree(&command);
if (*interp->result != 0) {
if ((code != TCL_OK) || (tty)) {
/*
* The statement below used to call "printf", but that resulted
* in core dumps under Solaris 2.3 if the result was very long.
*
* NOTE: This probably will not work under Windows either.
*/
puts(interp->result);
}
}
/*
* Output a prompt.
*/
prompt:
if (tty) {
Prompt(interp, gotPartial);
}
Tcl_ResetResult(interp);
}
/*
*----------------------------------------------------------------------
*
* Prompt --
*
* Issue a prompt on standard output, or invoke a script
* to issue the prompt.
*
* Results:
* None.
*
* Side effects:
* A prompt gets output, and a Tcl script may be evaluated
* in interp.
*
*----------------------------------------------------------------------
*/
static void
Prompt(interp, partial)
Tcl_Interp *interp; /* Interpreter to use for prompting. */
int partial; /* Non-zero means there already
* exists a partial command, so use
* the secondary prompt. */
{
char *promptCmd;
int code;
Tcl_Channel outChannel, errChannel;
promptCmd = Tcl_GetVar(interp,
partial ? "tcl_prompt2" : "tcl_prompt1", TCL_GLOBAL_ONLY);
if (promptCmd == NULL) {
defaultPrompt:
if (!partial) {
/*
* We must check that outChannel is a real channel - it
* is possible that someone has transferred stdout out of
* this interpreter with "interp transfer".
*/
outChannel = Tcl_GetChannel(interp, "stdout", NULL);
if (outChannel != (Tcl_Channel) NULL) {
Tcl_Write(outChannel, "% ", 2);
}
}
} else {
code = Tcl_Eval(interp, promptCmd);
if (code != TCL_OK) {
Tcl_AddErrorInfo(interp,
"\n (script that generates prompt)");
/*
* We must check that errChannel is a real channel - it
* is possible that someone has transferred stderr out of
* this interpreter with "interp transfer".
*/
errChannel = Tcl_GetChannel(interp, "stderr", NULL);
if (errChannel != (Tcl_Channel) NULL) {
Tcl_Write(errChannel, interp->result, -1);
Tcl_Write(errChannel, "\n", 1);
}
goto defaultPrompt;
}
}
outChannel = Tcl_GetChannel(interp, "stdout", NULL);
if (outChannel != (Tcl_Channel) NULL) {
Tcl_Flush(outChannel);
}
}