/* 
 * tkMacInit.c --
 *
 *	This file contains Mac-specific interpreter initialization
 *	functions.
 *
 * 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: @(#) tkMacInit.c 1.30 96/12/17 15:20:16
 */

#include <Resources.h>
#include <Files.h>
#include <TextUtils.h>
#include <Strings.h>
#include "tkInt.h"
#include "tkMacInt.h"
#include "tclMacInt.h"

/*
 * The following global is used by various parts of Tk to access
 * information in the global qd variable.  It is provided as a pointer
 * in the AppInit because we don't assume that Tk is running as an
 * application.  For example, Tk could be a plugin and may not have
 * access to the qd variable.  This mechanism provides a way for the
 * container application to give a pointer to the qd variable.
 */

QDGlobalsPtr tcl_macQdPtr = NULL;

/*
 *----------------------------------------------------------------------
 *
 * TkpInit --
 *
 *	Performs Mac-specific interpreter initialization related to the
 *      tk_library variable.
 *
 * Results:
 *	A standard Tcl completion code (TCL_OK or TCL_ERROR).  Also
 *	leaves information in interp->result.
 *
 * Side effects:
 *	Sets "tk_library" Tcl variable, runs initialization scripts
 *	for Tk.
 *
 *----------------------------------------------------------------------
 */

int
TkpInit(
    Tcl_Interp *interp)		/* Interp to initialize. */
{
    char *libDir, *tempPath;
    Tcl_DString path;
    int result;

    /*
     * The following does not work with
     * safe interps because file exists is restricted.
     * to be fixed using [interp issafe] like in Unix & Windows.
     */
    static char initCmd[] =
	"if [file exists $tk_library:tk.tcl] {\n\
	    source $tk_library:tk.tcl\n\
	    source $tk_library:button.tcl\n\
	    source $tk_library:entry.tcl\n\
	    source $tk_library:listbox.tcl\n\
	    source $tk_library:menu.tcl\n\
	    source $tk_library:scale.tcl\n\
	    source $tk_library:scrlbar.tcl\n\
	    source $tk_library:text.tcl\n\
	    source $tk_library:comdlg.tcl\n\
	    source $tk_library:msgbox.tcl\n\
	} else {\n\
	    set msg \"can't find tk resource or $tk_library:tk.tcl;\"\n\
	    append msg \" perhaps you need to\\ninstall Tk or set your \"\n\
	    append msg \"TK_LIBRARY environment variable?\"\n\
	    error $msg\n\
	}";

    Tcl_DStringInit(&path);

    /*
     * The tk_library path can be found in several places.  Here is the order
     * in which the are searched.
     *		1) the variable may already exist
     *		2) env array
     *		3) System Folder:Extensions:Tool Command Language:
     */
     
    libDir = Tcl_GetVar(interp, "tk_library", TCL_GLOBAL_ONLY);
    if (libDir == NULL) {
	libDir = Tcl_GetVar2(interp, "env", "TK_LIBRARY", TCL_GLOBAL_ONLY);
    }
    if (libDir == NULL) {
	tempPath = Tcl_GetVar2(interp, "env", "EXT_FOLDER", TCL_GLOBAL_ONLY);
	if (tempPath != NULL) {
	    Tcl_DString libPath;
	    
	    Tcl_JoinPath(1, &tempPath, &path);
	    
	    Tcl_DStringInit(&libPath);
	    Tcl_DStringAppend(&libPath, ":Tool Command Language:tk", -1);
	    Tcl_DStringAppend(&libPath, TK_VERSION, -1);
	    Tcl_JoinPath(1, &libPath.string, &path);
	    Tcl_DStringFree(&libPath);
	    libDir = path.string;
	}
    }
    if (libDir == NULL) {
	libDir = "no library";
    }

    /*
     * Assign path to the global Tcl variable tcl_library.
     */
    Tcl_SetVar(interp, "tk_library", libDir, TCL_GLOBAL_ONLY);
    Tcl_DStringFree(&path);

    /*
     * Source the needed Tk libraries from the resource
     * fork of the application.
     */
    result = Tcl_MacEvalResource(interp, "tk", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "button", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "entry", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "listbox", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "menu", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "scale", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "scrollbar", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "text", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "dialog", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "focus", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "optionMenu", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "palette", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "tearoff", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "tkerror", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "comdlg", 0, NULL);
    result |= Tcl_MacEvalResource(interp, "msgbox", 0, NULL);

    if (result != TCL_OK) {
	result = Tcl_Eval(interp, initCmd);
    }
    return result;
}

/*
 *----------------------------------------------------------------------
 *
 * TkpGetAppName --
 *
 *	Retrieves the name of the current application from a platform
 *	specific location.  On the Macintosh we look to see if the
 *	App Name is specified in a resource.  If not, the application 
 *	name is the root of the tail of the path contained in the tcl
 *	variable argv0.
 *
 * Results:
 *	Returns the application name in the given Tcl_DString.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

void
TkpGetAppName(
    Tcl_Interp *interp,		/* The main interpreter. */
    Tcl_DString *namePtr)	/* A previously initialized Tcl_DString. */
{
    int argc;
    char **argv = NULL, *name, *p;
    Handle h = NULL;

    h = GetNamedResource('STR ', "\pTk App Name");
    if (h != NULL) {
	HLock(h);
	Tcl_DStringAppend(namePtr, (*h)+1, **h);
	HUnlock(h);
	ReleaseResource(h);
	return;
    }
    
    name = Tcl_GetVar(interp, "argv0", TCL_GLOBAL_ONLY);
    if (name != NULL) {
	Tcl_SplitPath(name, &argc, &argv);
	if (argc > 0) {
	    name = argv[argc-1];
	    p = strrchr(name, '.');
	    if (p != NULL) {
		*p = '\0';
	    }
	} else {
	    name = NULL;
	}
    }
    if ((name == NULL) || (*name == 0)) {
	name = "tk";
    }
    Tcl_DStringAppend(namePtr, name, -1);
    if (argv != NULL) {
	ckfree((char *)argv);
    }
}

/*
 *----------------------------------------------------------------------
 *
 * TkpDisplayWarning --
 *
 *	This routines is called from Tk_Main to display warning
 *	messages that occur during startup.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Displays a message box.
 *
 *----------------------------------------------------------------------
 */

void
TkpDisplayWarning(
    char *msg,			/* Message to be displayed. */
    char *title)		/* Title of warning. */
{
    Tcl_DString ds;
    Tcl_DStringInit(&ds);
    Tcl_DStringAppend(&ds, title, -1);
    Tcl_DStringAppend(&ds, ": ", -1);
    Tcl_DStringAppend(&ds, msg, -1);
    panic(Tcl_DStringValue(&ds));
    Tcl_DStringFree(&ds);
}
