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Disclaimer
This software is copyrighted by the author, Martin
Goebbel. It may be used and distributed freely without any
restrictions.
This software is provided "as is" and any express or implied
warranties, including, but not limited to, the implied warranties
of merchantibility and fitness for a particular purpose are disclaimed.
In no event shall the author be liable for any direct, indirect,
incidental, special, exemplary, or consequential damages (including,
but not limited to, procurement of substitute goods or services;
loss of use, data, or profits; or business interruption) however
caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence or otherwise) arising
in any way out of the use of this software, even if advised of the
possibility of such damage.
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Why this program has been written
Actually there were two reasons for this:
- I wanted to write the documentation for my programs in HTML, but I didn't
want to include other peoples browsers. So, for every package to be complete
I had to include my own browser in order to avoid copyright problems.
- I also needed it for myself, for quickly viewing HTML Files under DOS,
without the need to first load another BIG program.
So the main Design Goals where to
- Keep the program small
- Make it widely usable
The second point was accomplished by using only BIOS Video routines for output.
This should make it work under standard Dos, Dos/V, DesqView and it
should work more easily with Screen Readers.
It should also work on a computer without a 100% compatible CGA video adapter
and on a dos emulator (not tested).
The drawback is that it is slow on older machines. I tried it
on a computer with 8086, 4.77MHz. It did work, but don't expect
blazing speed there.
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How to use it
Usage is actually pretty simple. On the Commanline type:
HLIST document.htm
If there is no filename supplied, hlist displays a list of available
commandline options.
If the file on the commandline does not exist, HLIST asks you if it should
create an empty HTML File under this name. If you answer yes the program starts
with this empty file which can then be edited using ALT-E (see below).
While loading the document, there is a message on the top of
the screen. After the Document has been parsed, there is a short, high
beep (This is consistent throughout the program. A successful operation
gives you a high beep and in case of an error there is a low pitched beep).
Now you can start scrolling through the document by a single line using the cursor up
and down keys. For a full page use the page up and down keys. Home and End will
take you to the start of the document or to its end.
The Tabulator Key can be used to select a Link. Pressing Tab will go to the
next Link, pressing Shift and Tab goes to the previous Link.
To activate a Link, just press Enter. If the file specified by the Link
cannot be loaded, you will hear a short beep and get an error message on
lines 24 and 25.
To reload the previous Document use the Cursor left key. If there is no
previous Document then nothing will happen.
The Display shows the HTML File in the upper part (Lines 1 to 20) and
any additional information in the lower part (Lines 22 to 25). Line 22
shows the document Title, line 23 the complete filename and line 24
the url of the currently selected link. On line 25 there is information on
which lines of the document are currently displayed, the total number
of lines in the document and the remaining available memory.
Emphasized and Bold characters are displayed in black, links are displayed
in blue. The BIOS Cursor will also be placed on the currently activated link.
If this Link is not within the display, the cursor will be placed on
position 80 in line 25.
If no function has been selected the lower Display shows the document
title, the file name and the value of the currently selected Link (or 'None'
if no Link is selected).
When using a Display Mode with more than 25 Lines, please adjust the Line
numbers acoordingly. The Information Field is always in the last 4 Lines.
Commandline options
- /EEditor where Editor is the name of the editor you want to use.
This replaces the ALT-O function. The default editor is edit.
- /SOUND and /NOSOUND switches beeping on and off.
- /ANSI and /NOANSI are used to enable (or disable) the
mapping of the extended Ansi Character Set to your selected Codepage ( See
also the section about special characters below).
The default for this option is on.
- /QUOTE and /NOQUOTE toggle the processing of the so
called quoted-printable characters. This should be used, for instance, if
you want to read an email which contains them.
The default for this option is off.
- /Display allows you to set the colors which are used for the
display. Just change the color values in the input fields and press
enter or esc when you're finished.
- /Printer brings up a screen to enter control codes which
are sent to your printer. Underlined printing is used for links, bold
printing is used for strong or bold characters. To enter control codes
use their ascii-code with a '#' prefix. ESC-F, for example, would be
entered as #27F.
- /RNumber and /LNumber set the right and left margins.
Meaningful values for the left margin would be between 0 and 10, for the right
margin you should values between 70 and 80 (It is of course possible to use
different values, these are just a suggestion).
- /SNumber causes HList to use a Display mode with Number Lines.
Meaningful values on VGA would be: /S25, /S28 or /S50. This feature
works only with EGA/VGA Cards.
- /F runs the program as a filter, which reads the HTML data from
the standard input and writes plain Ascii to standard output. In order to
create a readable text file from a HTML File use hlist like this:
TYPE INDEX.HTM | HLIST /F > INDEX.TXT
The values you set from the commandline will be stored in the executable.
You don't have to use them each time you call the program.
Functions
- F1: Shows a command overview in the upper part of the display.
- Alt-A: Toggles between Ansi mapping on and off. Press F1 to check
the current state.
- ALT-C: Creates a new HTML File. You will be prompted to enter a
filename. The default filename is the URL of the currently selected link.
- ALT-D: Shell to DOS. To return to HLIST type exit at the command prompt.
- ALT-E: Starts an Editor with the currently displayed File. If the
File has been changed after exiting the Editor, it will be reloaded.
- ALT-H: Select a File from the History List. The Files will be displayed
on the last three lines, each line contains 3 filenames. Number key 1 will reload
the current File, the number keys 2 to 9 will reload a previously loaded document.
ESC cancels the selection.
- ALT-L: This allows you select a file to load. The number keys 1 to 9
may be used to select a File or read a Directory. To change the Drive press
Shift and the Drive Letter (e.g Shift-A will select Drive A). If the Drive is
not ready (e.g. no Disk in A: or B:) you will hear a short Beep.
- ALT-P: Print the current File on LPT1.
The only Control Codes used for printing are ESC-E and ESC-F to turn
bold printing on and off. This should work on almost all Printers.
If it does not work on your Printer, look in your Printer Manual if there
is a way to make it compatible to an Epson printer. In case there is an error
while printing the computer will give you a beep and display an error message.
- Alt-Q: Toggles the processing of quoted-printable characters. To
check the currrent state press F1.
- Alt-S: Toggles between 25 and 50 Display Lines.
- ALT-X/ESC: Either of these two will exit the program.
Something more about links: you may only use local or relative links
(This program is not a full Web Browser after all). Something like
<A HREF="http://www.some-where.org/index.html"> is
not understood. But <A HREF="C:\HTML\INDEX.HTM"> or
<A HREF="..\HDOC\MAIN.HTM#label"> should work.
When using ALT-D or ALT-E the program will swap out all of
the data before starting an external program.
The data will be swapped (in that order) to either XMS, EMS or a File.
In order to be able to reload the data after you return to HLIST you have to
avoid using any TSR's or other programs which might mess up the DOS Memory
Allocation.
Addendum: I have experimented with running DosPPPD and WatTCP while
being shelled out to DOS. It seems to work fine.
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System Requirements
The minimal system requirements are
- A PC - compatible system with 8086 CPU, 4.77 MHz
- Any Video Adapter
- DOS 3.3
- The amount of RAM needed depends on the size of the HTML files
you want to view. 128K should be sufficient for small files (about 10K).
About Speed: On a 4,77 Mhz PC this program needs 25 seconds to parse
a 50K HTML File.
If nothing seems to happen after starting the program, it's not
necessarily a program crash. Just wait a while.
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Bugs and missing things
Like usual there are probably tons of Bugs I did't find yet.
This program supports only a subset of HTML 2.0.
I have only included the tags I felt to be necessary for writing the
documentation for my programs (See Reasons above, point 1 ).
This new Version allows it to view any Text file, wether HTML-Tags are included or not.
This should make it possible to view mail messages with included HTML-Parts.
Currently the following tags and special symbols are (more or less) supported:
Tags (not case sensitive)
- <HTML>, </HTML>
- <HEAD>, </HEAD>
- <BODY>, </BODY>
- <TITLE>, </TITLE>
- <BR>, <P>
- <HR>
- <EM>, </EM>
- <B>, </B>
- <UL>, </UL>
- <OL>, </OL>
- <LI>
- <A HREF="..>, <A NAME="..>, </A>
- <CENTER>, </CENTER>
- <PRE>, </PRE>
- <IMG>
- <H1>..<H6>
Special Symbols
New with this version is a better international support. It supports
all the special characters I found in my HTML 2.0 Book and
maps them correctly to your selected codepage. The following
codepages are currently recognized:
- Codepage 437: USA
- Codepage 850: Multilingual
- Codepage 860: Portugese
- Codepage 861: Iceland
- Codepage 863: France/Canada
- Codepage 865: Norway
- Codepage 866: Russia
If your codepage is not supported, then 437 will be used. In case you
are not sure what a codepage is and what it is needed for, you might
find something about it in your Dos manual.
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How to contact the Author
You may reach me by email under one of the following adresses:
- martin@tennyo.muc.de
- martin@tennyo.org
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