# 
# This file is part of the S370BALEdt distribution.
# Copyright (c) 2021 James Salvino.
# 
# This program is free software: you can redistribute it and/or modify  
# it under the terms of the GNU General Public License as published by  
# the Free Software Foundation, version 3.
#
# This program is distributed in the hope that it will be useful, but 
# WITHOUT ANY WARRANTY; without even the implied warranty of 
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License 
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#
# This is a primitive line editor
# designed for coding IBM S370 BAL source.
#
# You can also call the S370BALAsm or
# the S370BALEmulator so it's almost
# an IDE (edit - assemble - emulate
# all in one place)
#
# Programmers actually used a line editor
# similar to this one over 40 years ago.
#
# Using the TAB key you can format
# your assembler source for the
# expected column layout of:
# 1     10       16
# label mnemonic operands  [optional comment]
#
# For example, you can type:
# balr[TAB KEY]r12,0
#
# to add this line:
#          BALR  R12,0
#
# Another example, you can type:
# loop[TAB KEY]mvi[TAB KEY]0(r5),c'0'
#
# to add this line:
# LOOP     MVI   0(R5),C'0'
#
# A line that starts with an '*' is
# assumed to be a comment
#
# A line with no TAB charaters
# is assumed to be an editor command.
#
# For example, if you typed:
#
# list
#
# an enumerated source listing would be 
# displayed.
#
# *********************************************
# Commands and Editor Directives
# *********************************************
#
# LIST - list source file
# READ - read in source file overlaying what is
#        there or inserting after certain line
# SAVE - write out source file
# ASSM - assemble source file with S370BALAsm
# EMUL - run emulation with S370BALEmulator
# HELP - display help text
# QUIT - quit this program
#
# Edit Commands:
#  In1 - insert next line after line n1
#  Dn1 - delete line n1
#  Dn1,n2 - delete lines n1 to n2 (Block Delete)
#  En1 - replace line n1 with next line entered
#  Cn1,n2 - copy line n1 after line n2
#  Cn1,n2,n3 - copy lines n1 to n2 after line n3 (Block Copy)
#  Mn1,n2 - move line n1 after line n2
#  Mn1,n2,n3 - move lines n1 to n2 after line n3 (Block Move)
#  Gn1/aaa/bbb - on line n1 change text aaa to bbb
#
# *********************************************