path: husc6!think!ames!vsi1!altnet!uunet!steinmetz!yosemite!elliott
from: elliott@yosemite.steinmetz
newsgroups: comp.binaries.apple2
subject: view.exe, a file-browsing segment for atp-pro
message-id: <11775@steinmetz.ge.com>
date: 8 aug 88 17:35:24 gmt
sender: news@steinmetz.ge.com
reply-to: elliott@crd.ge.com (jim elliott)
organization: rensselaer polytechnic institute, troy ny
lines: 180

here's a new segment for atp, one of the several i have been promising
for a while. this is file view.exe, which when execed produces
view.bqy. use blu to extract view, and move it into your segments
subdirectory.

view lets you look at prodos files in several different formats, and
does a reasonable job of guessing what format to use initially. i
haven't rewritten the help screens to describe view yet, but it has
built-in help. here's a nutshell description to get you started:

when you launch view, it will ask you for the pathname of the file
you'd like to view. it will then open a window in which it will
display the start of the file. (the last two lines of the screen still
show your host session, as usual, so you can see if something
important happens there, and so that this segment is compatible with
remote mode. (yes, this means you can use atp in server mode to look
at files on your system from another machine.))

inside view there are some simple commands. hitting these keys while
it is displaying a screen will interrupt the display and process the
command immediately. "?" will give you a helpful summary of the
available commands. "=" shows the filename and position within that
file which is displayed. "f", the space bar and the down arrow will
all move you forward in the file by one screen. "b" and the up arrow
will put you back at the previous screen. (in order to deal with the
complexities of variable-length screens, view maintains a stack of
previous screens. since you can have up to 240 screens in this stack,
space should not be a problem. if you do run out of space,
screen-forward requests will beep to warn you that this position is
not being added to the stack. you can use the "g" command below to
clear the stack.)

"h" re-displays the current screen as a hex dump. "a" re-displays it
as ascii with control-characters shown in inverse video. "t"
re-displays it as text; control-characters are discarded (other than
cr, which is interpreted as a carriage return/line feed). this is the
most useful way to look at apple text files. "v" re-displays it
verbatim, passing all control characters to your current emulation.
note that this might not do what you want, for example, if cr just
causes a carriage return and there are no line feeds in the file, the
whole thing will overwrite itself on the first line of the screen.

"g" lets you enter a decimal number or a "$" followed by a hex number,
and will jump to that byte in the file. this essentially sets a new
origin in the file, clearing the screen stack, as mentioned above. you
can hit "g" by itself and a return to go back to the beginning. if you
just start typing a number or "$" without the "g", view takes it as
implied.

"q" and esc quit, returning you to terminal mode.

stay tuned for file transfer and other fun stuff... this segment is a
good example of what can be done in an afternoon and evening's work in
the atp development environment... (of course i do have an unfair
advantage in being very familiar with the routines available. but i do
hope other people will try playing with them.)

-------->8--------cut here--------8<--------
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BSAVE VIEW.BQY,A$1000,L$0C80
E00G
 .     .    .    .   .  . ... .  .   .    .    .     .    .   .   .  . ... . .

 JIM ELLIOTT                       /    ...!SEISMO!UUNET!STEINMETZ!CRD!ELLIOTT
                                  /            USERE2U7@RPITSMTS.BITNET
 "DON'T LOOK, SON, IT'S          /      JIM_ELLIOTT%MTS@ITSGW.RPI.EDU [SCHOOL]
  A SECULAR HUMANIST!"          /  (OR)     ELLIOTT@GE-CRD.ARPA       [WORK]
 .     .    .    .   .  . ... .  .   .    .    .     .    .   .   .  . ... . .