home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Grab Bag
/
Shareware Grab Bag.iso
/
090
/
rascal.arc
/
RED.DOC
< prev
Wrap
Text File
|
1980-01-01
|
25KB
|
901 lines
November 1983
This document tells how to use the Rascal text editor program,
RED.EXE, so that you can enter and maintain your Rascal programs.
This manual assumes you are familiar with MS DOS and Microsoft
BASIC.
RASCAL EDITOR USER'S MANUAL RASCAL EDITOR USER'S MANUAL
Manual version: 1.05
Software version: 1.05
Marty Franz
525 W. Walnut St., Kalamazoo, MI 49007
(616) 344-1821
(C) Copyright 1983 Marty Franz - All rights reserved
111483105 Rascal Editor User's Manual
INTRODUCTION INTRODUCTION
RED.EXE is a text editor specially designed for the entry and
editing of Rascal programs.
Briefly, RED lets you easily enter and modify your Rascal
programs without resorting to EDLIN. RED is screen-oriented, so
you can edit 24 lines of text at once, and uses the IBM PC's
special keys for many of its editing functions.
Right now, RED is an in-memory editor. This means that files
must be transferred to and from a buffer in memory for editing.
Only files small enough to fit entirely in memory (up to 60KB
maximum) can be edited using RED.
In actual use, RED works a lot like BASIC does: you LOAD
programs into RED's memory buffer, edit them, then SAVE them back
to diskette when you're done. After a program has been stored on
diskette, it can be translated by the Rascal BASIC preprocessor
into a BASIC program.
Please take the time to read these instructions before you
use RED. The best way to learn RED is to practice editing a
file, trying out each command, editing function, or special key
until you feel comfortable with it. RED's SAVE and RESAVE
commands make it unlikely that you will destroy valuable data.
PROGRAM REQUIREMENTS PROGRAM REQUIREMENTS
To edit files using RED, you need an IBM PC or XT with:
- at least 64KB of memory, (if you have this much memory
your file size will be limited to about 15KB)
- at least one single-sided diskette drive,
- a color or monochrome adapter, with a monitor capable
of displaying 80-character lines,
- MS DOS version 1.1 or 2.0, and
- the file RED.EXE.
BUGS AND IDEAS BUGS AND IDEAS
When you are using RED, please remember that this is only
version 1.05. If you find bugs, or you have ideas for improving
this editor, please contact me:
Marty Franz
525 W. Walnut St.
Kalamazoo, MI 49007
(616) 344-1821
Page 2 111483105 Rascal Editor User's Manual
BASIC MODES BASIC MODES
When you are editing with RED, the editor is always in one of
three modes, called edit, insert, and command. Each mode is
adapted to a particular set of editing tasks. Insert mode is
used when a lot of text is being added to the file. Edit mode is
used for touring the file and making minor changes to many lines.
Command mode is used with longer, BASIC-like commands that affect
the overall structure of the file and possibly even delete parts
of it.
RED uses the 25th line of your screen as a status line to
display the current mode, and other important facts such as the
name of the file being edited. The status line is always
displayed in reverse video, and tells:
- the mode (command, edit, or insert),
- the name of the file being edited,
- the line in the file the cursor is on,
- the column on the screen the cursor is on.
The remainder of the screen, lines 1-24, is called the "edit
area" in this manual and is used to display the actual text lines
of the file you are working on. CAUTION: in this version of RED,
only the first 80 characters of a line can be displayed and
edited. Furthermore, attempting to load lines longer than 132
characters can result in lost data.
To start RED from MS DOS, enter:
A>red
and you will receive the messages:
Rascal Program Editor version 1.05
(C) Copyright 1983 Marty Franz
Press the "enter" key at this point and RED will go on to clear
the screen, display the status line at the bottom, and begin your
editing session.
Page 3 111483105 Rascal Editor User's Manual
COMMAND MODE COMMAND MODE
RED begins the edit session in command mode. At this point
the memory buffer is empty. You must use the LOAD command to
load a file into memory for editing, or enter insert mode and
input new text lines into the buffer. The LOAD command is
described later in this section.
Once editing is underway, you may freely switch between the
three modes mentioned earlier. The functions available in each
mode are described in one of the next three sections of this
manual. The individual command mode commands are described below
in this section. When you read their descriptions, remember that
the squiggly braces { and } are placed around items which you
must supply as "arguments" to a command. Also note that whenever
a line number is mentioned, it refers to a line number in the
file, not a BASIC line number generated by Rascal.
APPEND APPEND
The APPEND command has the format:
APPEND {d:filename.ext}
APPEND loads the file {d:filename.ext} into the buffer at the
line just ahead of the current line. The name of the file being
edited remains the same.
CHANGE CHANGE
CHANGE is used to search for a pattern in a range of text
lines and replace it with another. The format of the CHANGE
command is:
CHANGE {start line} {end line}
After this has been typed, RED prompts for the old pattern by
asking "from:" . The old pattern is then entered. Just pressing
the "enter" key cancels the command. After getting the old
pattern RED prompts "to:" for the new pattern. When this is
input the edit area clears and the changes made and their line
numbers are displayed. If you press any key on the keyboard
during this process the change is cancelled at that point. If
{startline} and {endline} are specified, the change occurs only
over that line range. If {endline} is omitted, the last line in
the file is assumed. If both {startline} and {endline} are
omitted, all the lines in the file are assumed.
Page 4 111483105 Rascal Editor User's Manual
Search Strings Search Strings
In specifying a pattern to search for, two special characters
may be used to make this process easier.
The first, {^}, (the shifted-6 character on your keyboard)
"anchors" the search to the start of the line in the file. That
is, only characters beginning in column 1 will be checked for the
pattern.
The second special character, {?}, is used as a "wild card",
a character that matches any at all in the text line.
Change Strings Change Strings
In specifying a new pattern for the CHANGE command, the {?}
(wild card) character may be used to match a corresponding
character in the old pattern. There must be as many {?}s in the
change string as there are in the search string.
DELETE DELETE
The DELETE command is used to delete a range of lines in the
buffer. It has the format:
DELETE {start line} {end line}
Here, {startline} and {endline} are used just as they are with
the CHANGE command. No check is made to see if the buffer has
been saved before the DELETE command is executed, so use this
command with care. After DELETE completes, command mode resumes
with the first line after those deleted shown at the top of the
edit area.
FIND FIND
The FIND command searches for a string in the file. When the
string is found, RED will enter edit mode and the line will be
displayed at the top of the edit area with the next 23 lines in
the file shown below it. The format of the FIND command is
simply:
FIND
If the string is not found, RED remains in command mode.
Page 5 111483105 Rascal Editor User's Manual
G (GOTO) G (GOTO)
The G command is used to go to a line in the file and enter
edit mode. The line is displayed at the top of the edit area,
with the next 23 lines in the file shown after it. G's format
is:
G {n}
Typing G with no line number is the same as pressing F1, the edit
mode key.
HELP HELP
The HELP command displays a one-page summary of RED's
commands and function keys on the screen.
LOAD LOAD
LOAD will read a file from diskette into the memory buffer,
overlaying whatever text was there before. If what you were
editing wasn't saved, the "file not saved" message (see "NEW"
below) is displayed. The LOAD command's format is:
LOAD {d:filename.ext}
The LOAD command also sets the filename on the status line for
future SAVE and RESAVE commands.
LLIST LLIST
The LLIST command is used to list a range of lines in the
file on your printer. Its format is:
LLIST {start line} {end line}
The printer currently used by MS DOS as LPT1: will receive the
output. Both {startline} and {endline} work the way they do for
the CHANGE command.
NAME NAME
NAME is used to set the name of the file for the SAVE and
RESAVE commands. Normally, NAME isn`t used much because the name
of the file being edited is set by the LOAD command. The format
of NAME is:
NAME {d:filename.ext}
No disk access is done by NAME, only the filename displayed on
the status line is changed.
Page 6 111483105 Rascal Editor User's Manual
NEW NEW
NEW will clear the current buffer and the filename. Its
format is simply:
NEW
A check is made to see if the buffer has been saved before
proceeding. If not, the message:
file not saved. proceed?
is displayed. Answering {y} will cause RED to clear the buffer
and the edit area; Typing {n} will abort the command.
RESAVE RESAVE
RESAVE will save the file currently being edited back to
disk. It assumes the file already exists. The filename used It assumes the file already exists.
will be the one displayed on the status line. The format of
RESAVE is:
RESAVE
SAVE SAVE
SAVE saves the file in the buffer back to disk. Unlike
RESAVE, it assumes the file does not exist. If the file exists it assumes the file does not exist.
a warning message is displayed and nothing happens. The format
for SAVE is:
SAVE
Page 7 111483105 Rascal Editor User's Manual
SEARCH SEARCH
SEARCH will ask for a search string and will then display all
the occurences of the string in the file. The format of the
SEARCH command is simply:
SEARCH
SYSTEM SYSTEM
The SYSTEM command is used to exit RED and go back to MS DOS,
just like it is in Microsoft BASIC.
TABS TABS
The TABS command has the format:
TABS {n}
This command sets the column stops for the tab key to every {n}
columns. Setting TABS less than or equal to 0 is the same as
setting TABS to 1. When RED is started, 4 is the initial tab
setting.
Page 8 111483105 Rascal Editor User's Manual
EDIT MODE EDIT MODE
Edit mode is entered by pressing F1 at any time. Edit mode
is used for changing individual text lines and for touring the
file.
In edit mode, you can't arbitrarily replace text. That can
only be done in insert mode. Instead, to replace a single
character at the current cursor position the X command (see
below) is used. Another method for massive text replacement is
to delete the characters you don't want, enter insert mode,
reenter the new ones, and then resume edit mode.
The majority of edit mode functions are activated by the PC's
special keys. These are summarized in the "RED KEY MAP" section
This section describes the edit mode functions not activated by
special keys.
EDIT: GOTO EDIT: GOTO
Typing G when you are in edit mode will cause RED to ask for a
line number. When this is supplied, this line is displayed at the
top of the edit area and edit mode resumes. This function works
the same as G does in command mode.
EDIT: KILL EDIT: KILL
Typing K in edit mode will cause RED to ask for a single
character. After this is received, all the characters from the
cursor right up to this character (or the end of the line if the
character isn't found) will be deleted.
EDIT: SEARCH EDIT: SEARCH
Typing S when in edit mode will cause RED to ask for a single
character. When this is entered, the cursor will move right to
this character or the end of the line.
EDIT: EXCHANGE EDIT: EXCHANGE
Typing X in edit mode will cause RED to ask for a single
character. This character will then replace the one under the
cursor.
Page 9 111483105 Rascal Editor User's Manual
INSERT MODE INSERT MODE
Insert mode is used for rapid entry of text. You can enter
Insert mode at any time by pressing the Ins key on the PC. When
this is done "insert" is displayed on the status line and the
cursor fattens. Text can now be entered in the edit area at the
line the cursor is on. The characters you enter will will be
inserted to the left of the character the cursor was on when you
started.
In insert mode, only some of the special edit mode control
keys retain their normal function. These are summarized in the
"RED KEY MAP" section of the manual. More importantly, the ENTER
key will continue insert mode on the line below the cursor,
opening a new line in the edit area, and scrolling the lines
below down a line.
Insert mode is exited by pressing Ins again to enter edit
mode, or F1 (edit) or F2 (command).
Page 10 111483105 Rascal Editor User's Manual
RED KEY MAP RED KEY MAP
This section lists RED's special keys and what they do.
KEY DESCRIPTION ___ ___________
F1 Enters edit mode.
F2 Enters command mode.
F3 In edit mode, moves cursor up one line and enters
insert mode (insert up).
F4 In edit mode, moves cursor down one line and enters
insert mode (insert down).
F5 In edit mode, splits the line at the cursor.
F6 In edit mode, joins current line to end of line above
it. All lines below the cursor move up one in the
edit area.
F7 In edit mode, deletes entire line cursor is on. All
lines below move up one in edit area.
F8 Deletes from cursor through the end of the
current line.
F10 Undoes any changes made in edit mode to current
line.
Home In edit mode, moves cursor to start of current line.
End In edit mode, moves cursor to end of current line.
Up In edit mode, moves cursor up one line. Used in
Arrow insert mode, moves up a line and enters edit mode.
Down In edit mode, moves cursor down one line. Used in
Arrow insert mode, moves down a line and enters edit mode.
Left In edit mode, moves cursor left one character.
Arrow "Character" means a tab may move the cursor several
columns. Also works in insert mode.
Right In edit mode, moves cursor left one character. Also
Arrow works in insert mode.
PgUp In edit mode, starts scrolling the edit area forward
through the file (towards the front). Pressing any
key stops scrolling and resumes edit mode at the
cursor.
Page 11 111483105 Rascal Editor User's Manual
KEY DESCRIPTION ___ ___________
PgDn Same as PgUp, but scrolls down through the file.
Ins Insert mode toggle; enters insert mode, then enters
edit mode if used in insert mode.
Del Deletes character at cursor; line moves left one
character, cursor stays at same place. Works in both
insert and edit modes.
<- (Backspace) Deletes character to left of cursor;
cursor moves left one character. Works in both insert
and edit modes.
<-' (Enter) Has no effect in edit mode; in insert mode
moves cursor down one line and continues text
insertion.
Space In edit mode only, acts the same as the Left Arrow
Bar key, moving the cursor left one character.
Page 12 111483105 Rascal Editor User's Manual
ERROR MESSAGES ERROR MESSAGES
Here's a list of the error messages RED will give you when
you do something wrong. They will display on the status line
after the incorrect command. To continue editing when an error
occurs, press "enter" and the message will disappear.
If you ever receive a message prefaced by the words "error:",
"disk error:", or "system error:", SAVE your changes to a new
file immediately and then abandon your editing session! One of
these messages means RED has seriously malfunctioned. Report it
after gathering as much information as you can.
command not found
This message means you tried to use a command that wasn't one
of the ones listed earlier.
pattern not found
The search string you tried to find in the file isn't there.
bad line number
You used a line number in the GOTO command that isn't a
positive number. Only the digits 0-9 can be used when you
specify a line number.
no file argument
You tried to LOAD or APPEND a file without telling RED its
name.
file not found
The file you tried to LOAD or APPEND from, or RESAVE to, does
not exist on your diskette, or you misspelled its name.
line truncated
The result of a LOAD or CHANGE command was a line greater
than 132 characters. The line was chopped off on the right.
You cannot currently edit lines with more than 132 characters
in them.
Page 13 111483105 Rascal Editor User's Manual
file not named
You have tried to SAVE or RESAVE a file without giving RED a
name to use for it. The NAME command will do this for you.
file exists
The file name you gave the SAVE command already exists on
your diskette. You need the RESAVE command instead.
bad argument
You gave a command using two arguments, such as DELETE, one
or more that were not numbers.
file not saved. proceed?
You will receive this message whenever you use the LOAD or
NEW command and you have not saved what you were working on.
This is because these commands clear the memory buffer.
Answer {y} or {n} depending on what you want to do - {y} to
continue and destroy the buffer, or {n} to back out and
cancel the command. You don't need to press "enter" after
typing {y} or {n}.
new line too long
The line created in a CHANGE command by substituting the new
pattern for the old one is turned out to be greater than 132
characters long. The CHANGE command aborts at this point.
too many ?'s in change mask
You had more ?'s in your change string than you did in your
search string. See the description of the CHANGE command in
this manual for more information.
error writing file
You will receive this message when you try to SAVE or RESAVE
your file and there isn't enough room on the drive you chose.
Only part of the file has been saved. You must insert a
fresh diskette and try to save the file again.
Page 14 111483105 Rascal Editor User's Manual
COPYRIGHT COPYRIGHT
RED.EXE is based on ED2, a public-domain text editor written
by Edward K. Ream and originally published in the January 1982
issue of Doctor Dobb's Journal. It has been substantially ______ ______ _______
changed to run on the IBM PC, including the addition of software
support for the PC's display and keyboard hardware. The revised
editor and manual are copyrighted materials and may be
distributed only for private, noncommercial use.
DISCLAIMER DISCLAIMER
Although reasonable testing has been conducted, under no
circumstances will the author be liable to you or any other third
party for any damages, including lost profits or other incidental
or consequential damages, arising out of the use of, or inability
to use, this software.
Page 15 111483105
