Programmer 7500/MAX_PROGRAMMERS.iso/EDITORES/VEDT.ZIP/DEMO8.TXT

Text File | 1990-05-18 | 5.5 KB | 291 lines

As you enter Command Mode commands,
you will be able to see their effect
in the upper left window.

There are several commands for moving
the cursor:

Z    Move to end of file
B    Move to begin of file

L    Move down one line
10L    Move down 10 lines
-L    Move up one line
-5L    Move up five lines

C    Move right one character
-C    Move left one character
-20C    Move left 20 characters

Type each of these commands.  Remember
to press <Enter> after each command.

-- Give command "MN" to continue --


Two commands delete text:

D    Delete current character
5D    Delete next 5 characters

K    Delete to end of current line
-2K    Delete the previous two lines

Several commands insert text:

I/text/    Insert the following text
jEI    Insert character with value "j"

For example, give the command:

I/Insert this text. /

To insert the graphics character with
value "205" give the command:

205 EI       (the space is optional)

-- Give command "MN" to continue --


The real power of Command Mode comes
from the ability to combine commands.

For example, the commands to insert a
new line at the end of the file are:
(Note: Press the "<Enter>" key twice .)

Z I/This is the last line <Enter>
/ <Enter>


The commands to delete the first line in
the file are:

B K


-- Give command "MN" to continue --







The "F" (Find) command searches for
text.  For example, to find the next
occurrence of "the" give the commands:

F/the/

The command to search for the 4th
occurrence of the "the" is:

4F/the/

(Try this: press <Cursor Up> to get the
previous command "F/the/", press <Home>,
type "4" and press <Enter>.)

The commands to search from the
beginning of the file for the word "the"
occurring at the beginning of a line is:

B F/|<the/

-- Give command "MN" to continue --






You can use the Command Mode as a simple
integer calculator by just typing in the
algebraic expression you want
calculated.  For examples, enter:

12 + (169 / 13)    (and <Enter>)

24 * 92 - 16

You can also calculate the ASCII values
of characters and control characters.
For example, enter:

"A

Its value is 65 because the letter "A"
is the 65th character in the ASCII
table.  For the value of <CTRL-S> enter:

^S    (Type "^", then type "S".)

Its value is 19.
-- Give command "MN" to continue --


The following "macro" will display the
line numbers of those lines in our file
which contain the phrase "VEDIT PLUS".
Type it in carefully.  Note that you
must press the <ESC> key.

B [ F/VEDIT PLUS/ .LN <ESC> ]

Here is how it works:

The "B" moves to the beginning of the
file.   The "[" and "]" specify a loop
which is to be repeated.  The
"F/VEDIT PLUS/" searches for the phrase.
The ".LN <ESC>" displays the current
line number.  The macro loops until
done.

Congratulations.  You have now written
a computer program using VEDIT PLUS!

-- Give command "MN" to continue --



Here is a macro which counts the number
of words in the file and displays the
result:

0XS(1)
B [ F/|S|A/ XA(1)]
YT/Number of words =/ XT(1)

Try it.

"0XS(1)" initializes a counter to zero.
"F/|S|A/ searches for the next word.
"XA(1)" increments the counter each
time a word is found.  The "YT" command
displays the following text and "XT(1)"
displays the contents of the counter.

-- Give command "MN" to continue --







VEDIT PLUS has many internal counters
which simplify writing useful macros.
For example, the following macro is an
easier way of counting the words in a
file.  Try it.

B #F/|S|A/
YT/Number of words = / .RV


"#F/|S|A/" searches for all occurrences
of a new word.  ".RV" displays how many
times the search succeeded, i.e. how
many words there are in the file.

-- Give command "MN" to continue --









"YI" is a very powerful command which
lets you re-route anything that is
normally displayed on the screen into
the file.

For example, try this variation of the
previous macro:

B #F/|S|A/
Z
YI YT/Number of words = / .RV


-- Give command "MN" to continue --











Note:    Since the help system fills
    the entire screen you should
    read these instructions before
    typing anything.

The "H" command gives help in Command
mode by first displaying several
screens which list all commands.  For
help on a particular command type the
command letter(s) and <Enter>.

For example, for help with the "ET"
command which changes the Tab positions,
type "H" and <Enter> and then "ET" and
<Enter>.

As an alternative, you can give the
command "HET" (and <Enter>) which skips
the help menu and directly gives help on
the "ET" command.

-- Give command "MN" to continue --



The "H" command gives help on any
command.  The "EH" command gives help on
common topics.

The on-line help uses three help files
(VVHELP.HLP, VPHELP.HLP and
VPEHELP.HLP).  You can easily change
these files to suit your own purposes.
It is also informative to print these
files;  they contain approximately the
same information as the Quick Reference
section of the manual.

(Due to space constraints on this demo
disk, the file VPEHELP.HLP is not
included and the "EH" command is
therefore inoperative.)

-- Give command "MN" to continue --






This demo has barely scratched the
capabilities of the Command Mode.
However, we hope that it has given you a
few hints on how it can be used.

If you are the programming type you may
want to print the on-line help file
VPHELP.HLP which briefly describes each
command.


-- Give command "MN" to continue --