File: gedi

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#!/usr/local/bin/perl -w

###############################################################################
# Copyright (c) 1999  Greg London
# All rights reserved.
# This program is free software.
# You can redistribute it and/or modify it under the same terms as Perl itself.
###############################################################################

###############################################################################
# This is a perl application, called gedi, implementing a text editor.
# gedi is short for Greg's EDItor. The "g" being pronounced like a "j".
###############################################################################


require 5;
use locale;
use strict;  

use Tk;
use Tk::widgets qw(TextEdit);
use File::Basename;

###########################################
# check command line parameter.
# if none, start with file called 'NewFile'
# if -help, print help
# if filename, open file or die
# note, wildcard automatically gets handled by perl interpreter,
#	so that @ARGV contains list of matches.
###########################################
my $argcount = @ARGV;
my ($global_filename) = @ARGV;

if	($argcount>1) 
	{
	print "\n";
	print "ERROR: too many files specified. \n";
	die "\n";
	}

if ($argcount == 0)
	{$global_filename = 'NoName';}

if (
	($global_filename eq 'help') ||
	($global_filename eq '-help') ||
	($global_filename eq '-h') ||
	($global_filename eq '-?')
    )
	{
	print "\n";
	print "$0 expects one command line argument: \n";
	print " the name of the file to edit \n";
	die "\n";
	}


# want FileSelect to use the last used directory as the starting directory
# store directory in $global_directory.
my $global_directory = dirname($global_filename);

##############################################
##############################################
## input parameters have been filtered.
## set up three frames to put everything into.
## menu_frame, text_frame, counter_frame
##############################################
##############################################
my $top = MainWindow->new();

# my $menu_frame = $top->Frame->pack(-anchor=>'nw');
my $text_frame = $top->Frame->pack
	(-anchor=>'nw', expand=>'yes', -fill => 'both'); # autosizing
my $counter_frame = $top->Frame->pack(-anchor=>'nw');

##############################################
##############################################
## now set up text window with contents.
##############################################
##############################################

## autosizing is set up such that when the outside window is 
## resized, the text box adjusts to fill everything else in.
## the text frame and the text window in the frame are both 
## set up for autosizing.

my $textwindow = $text_frame->Scrolled(
	'TextEdit',
	exportselection => 'true',  # 'sel' tag is associated with selections
	# initial height, if it isnt 1, then autosizing fails 
	# once window shrinks below height
	# and the line counters go off the screen.
	# seems to be a problem with the Tk::pack command;
	height => 1, 	 
	-background => 'white',
	-wrap=> 'none', 
	-setgrid => 'true', # use this for autosizing
	-scrollbars =>'se')
	-> pack(-expand => 'yes' , -fill => 'both');	# autosizing

#$textwindow->FileName($global_filename);


$top->protocol('WM_DELETE_WINDOW'=>
 sub{$textwindow->ConfirmExit;} 
 );

$SIG{INT} = sub {$textwindow->ConfirmExit;};

##############################################
##############################################
## set up current line number display
##############################################
##############################################
my $current_line_label = $counter_frame
	-> Label(text=>'line: 1') 
	-> grid(-row=>1,-column=>1, -sticky=>'nw' );

my $total_line_label = $counter_frame
	-> Label(text=>'total lines: 1') 
	-> grid(-row=>2,-column=>1, -sticky=>'nw' );

my $current_column_label = $counter_frame
	-> Label(text=>'column: 0') 
	-> grid(-row=>3,-column=>1, -sticky=>'nw' );

my $insert_overstrike_mode_label = $counter_frame
	-> Label(text=>' ') 
	-> grid(-row=>5,-column=>1, -sticky=>'nw' );

sub update_indicators
{
	my ($line,$column)= split(/\./,$textwindow->index('insert'));
	$current_line_label->configure (text=> "line: $line");
	$current_column_label->configure (text=> "column: $column");

	my ($last_line,$last_col) = split(/\./,$textwindow->index('end'));
	$total_line_label->configure (text=> "total lines: $last_line");

	my $mode = $textwindow->OverstrikeMode;
	my $overstrke_insert='Insert Mode';
	if ($mode) 
		{$overstrke_insert='Overstrike Mode';}
	$insert_overstrike_mode_label->configure
		(text=> "$overstrke_insert");

	my $filename = $textwindow->FileName;
	$filename = 'NoName' unless(defined($filename));
	my $edit_flag='';
	if($textwindow->numberChanges) 
 		{$edit_flag='edited';}
	$top->configure(-title => "Gedi  $edit_flag $filename");
	$textwindow->idletasks;

}

$textwindow->SetGUICallbacks (
 [
  \&update_indicators, 
  sub{$textwindow->HighlightAllPairsBracketingCursor}
 ] 
);


##############################################
##############################################
# call back functions
##############################################
##############################################

########################################################################
my $about_pop_up_reference;
sub about_pop_up
{
	my $name = ref($about_pop_up_reference);
	if (defined($about_pop_up_reference))
		{
		$about_pop_up_reference->raise;
		$about_pop_up_reference->focus;
		}
	else
		{
		my $pop = $top->Toplevel();
		$pop->title("About");
	
		$pop->Label(text=>"Gedi (Gregs EDItor)")->pack();
		$pop->Label(text=>"Ver. 1.0")->pack();
		$pop->Label(text=>"Copyright 1999")->pack();
		$pop->Label(text=>"Greg London")->pack();
		$pop->Label(text=>"All Rights Reserved.")->pack();
		$pop->Label(text=>"This program is free software.")->pack();
		$pop->Label(text=>"You can redistribute it and/or")->pack();
		$pop->Label(text=>"modify it under the same terms")->pack();
		$pop->Label(text=>"as Perl itself.")->pack();
		$pop->Label(text=>"Special Thanks to")->pack();
		$pop->Label(text=>"Nick Ing-Simmons.")->pack();

		my $button_ok = $pop->Button(text=>'OK',
			command => sub {$pop->destroy();
			$about_pop_up_reference = undef;
			} )
			->pack();
		$pop->resizable('no','no');
		$about_pop_up_reference = $pop;
		}
}

##############################################
##############################################
## now set up menu bar
##############################################
##############################################

my $menu = $textwindow->menu;
$top->configure(-menu => $menu);

##############################################
# help menu
##############################################
my $help_menu = $menu->cascade(-label=>'~Help', -tearoff => 0, -menuitems => [
         [Command => 'A~bout', -command => \&about_pop_up]
         ]);

##############################################
# debug menu
##############################################

if (0)
	{
	my $debug_menu = $menu->cascade(-label=>'debug', -underline=>0);


	$debug_menu->command(-label => 'Tag names', -underline=> 0 ,
		-command => 
		sub{ 
		my @tags = $textwindow->tagNames(); 
		print " @tags\n"; 

		foreach my $tag (@tags)
			{
			my @ranges = $textwindow->tagRanges($tag);
			print "tag: $tag  ranges: @ranges \n";
			}

		print "\n\n\n";
		my @marks = $textwindow->markNames;
		print " @marks \n";
		foreach my $mark (@marks)
			{
			my $mark_location = $textwindow->index($mark);
			print "$mark is at $mark_location\n";
			}


		print "\n\n\n";
		my @dump = $textwindow->dump ( '-tag', '1.0', '465.0' );
		print "@dump \n";

		print "\n\n\n";
		print "showing tops children:";
		my @children = $top->children();
		print "@children\n";

		foreach my $child (@children)
			{
			my $junk = ref($child);
			print "ref of $child is $junk \n";
			}

		my $overstrike = $textwindow->OverstrikeMode;
		print "Overstrike is $overstrike \n";

		$textwindow->dump_array($textwindow);
		});
	}

##############################################
# set the window to a normal size and set the minimum size
$top->minsize(30,1);
$top->geometry("80x24");

#############################################################################
#############################################################################
#############################################################################
#############################################################################




##############################################
## this line for debug
## $top->bind('<Key>', [sub{print "ARGS: @_\n";}, Ev('k'), Ev('K') ]  );	

##########################################
## fill the text window with initial file.

if ($argcount)
	{
	if (-e $global_filename) # if it doesn't exist, make it empty
		{
		# it may be a big file, draw the window, and then load it
		# so that we know something is happening.
		$top->update;
		$textwindow->Load($global_filename);
		}
	}


##############################################
$textwindow->CallNextGUICallback;

MainLoop();