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StarInfo/Fletcher/!Help
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.
| Tape/disk: | Home » Archimedes archive » Acorn User » AU 1998-05 A.adf » Regulars |
| Filename: | StarInfo/Fletcher/!Help |
| Read OK: | ✔ |
| File size: | 1CB2 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
SquigglyPipes
=============
Version 1.01 (10 Aug 1997)
Introduction
------------
If you've used Unix you'll know how nice it can be to perform a task and,
depending on the result, do something else. Take, for example a simple 'list
all files and show the symlinks'; this might be done as something like
"ls -al | grep '->'". Whilst this probably isn't the best example of pipes,
it does illustrate the point that this is impossible under Risc OS in a
single command.
Squiggly pipes allows you to do a similar thing to the above unix command
with the line "ex { | grep Link }" (ex is the equivilent of ls -al, SymLinks
have the filetype 'Link'). Notice that the pipe usage is almost identical to
the redirection usage "command { <|> file }".
Usage
-----
Basically any line with { | <anything> } will be parsed as a piped command.
The piped command /must/ be the last thing on the line; anything after it
will be ignored at present. Pipes may be nested, but you should remember to
include the correct number of closing brackets. That's about all I can tell
you really... It works in the majority of cases :-)
Redirection
-----------
Pipes are implemented using both the Risc OS and C redirection systems. If a
program is recognised as C it will have an input, or output (or both)
appended to it's command line; otherwise a standard OS_ChangeRedirection call
is issued. C programs are recognised as such by the signature &EF000011 at
&8010, so if you have a basic program which uses C style IO you should modify
it to contain a !&8010=&EF000011 /before/ the OS_GetEnv line. Conversely, to
ensure that you know how much data to read from the input if using 'GET'
(etc) you should do something like :
SYS "OS_ChangeRedirection",-1,-1 TO i%:IF i%<>0 THENleft%=EXT#i%-PTR#i%
ELSEleft%=0
Error redirection is not performed in C, and should still result in output to
the screen in much the same way an error would in assembler or for built-ins.
Examples
--------
These are some of the examples I've tried any found to work successfully.
=== examples of simple pipes ===
( search the help for a the word 'key', search the modules list for a
particular module, and search for commands starting with 'wimp' )
| *help { | grep key }
| ==> Help on keyword Help
| *Help <subjects> attempts to give useful information on the selected
| topics. Special keywords
| *modules { | grep URI }
| 111 0186A2B4 01830414 URI
| *help wimp. { | grep "==>" }
| ==> Help on keyword WimpFlags
| ==> Help on keyword WimpMode
| ==> Help on keyword WimpPalette
| ==> Help on keyword WimpSlot
| ==> Help on keyword WimpTask
| ==> Help on keyword WimpWriteDir
| ==> Help on keyword WimpDragDelay
| ==> Help on keyword WimpDragMove
| ==> Help on keyword WimpDoubleClickDelay
| ==> Help on keyword WimpDoubleClickMove
| ==> Help on keyword WimpAutoMenuDelay
| ==> Help on keyword WimpMenuDragDelay
| ==> Help on keyword WimpSWIVe
=== example of complex gzip ===
( compress a file, decompress it, and search the output for the word 'Justin')
| *gzip -c text { | gzip -d -c { | grep Justin } }
| Author Justin Fletcher
=== examples of error handling ===
( Command where the first half of a pipe is broken, then second part is
broken )
| *ahelp wimp { | grep found }
| Bad vector release
(only under a taskwindow; under a shell this works correctly... curious)
| *help wimp. { | agrep "==>" }
| File 'agrep' not found
=== example of use of awk ===
( show the directory [as example], then search for files dated 'August',
display them and at the end the total of their lengths )
| *ex ^.^.^
| Dir. ADFS::Gerph.$.Utils.Library Option 02 (Run)
| CSD ADFS::Gerph.$.Utils.Library.GNU.awk.Egs
| Lib. ADFS:"Unset"
| URD ADFS:"Unset"
| Acorn D/ Directory 14:08:51 06-May-1997 2048 bytes
| C D/ Directory 18:35:27 03-Aug-1997 2048 bytes
| CD D/ Directory 14:16:02 06-May-1997 2048 bytes
| Compress D/ Directory 14:26:08 06-May-1997 2048 bytes
| Econet D/ Directory 14:24:06 06-May-1997 2048 bytes
| Encode D/ Directory 14:18:04 06-May-1997 2048 bytes
| FSCK D/ Directory 14:09:20 06-May-1997 2048 bytes
| GNU D/ Directory 14:16:34 06-May-1997 2048 bytes
| Graphics D/ Directory 14:22:01 06-May-1997 2048 bytes
| Internet D/ Directory 16:53:28 06-May-1997 2048 bytes
| Mail D/ Directory 18:18:18 07-Aug-1997 2048 bytes
| Misc D/ Directory 14:26:36 06-May-1997 2048 bytes
| Module D/ Directory 14:13:16 06-May-1997 2048 bytes
| Obsolete D/ Directory 14:11:20 06-May-1997 2048 bytes
| Prog D/ Directory 14:17:31 06-May-1997 2048 bytes
| RCS D/ Directory 15:57:16 12-Apr-1997 2048 bytes
| ReadFiles WR/ BASIC 14:54:59 06-May-1997 985 bytes
| System D/ Directory 14:19:31 06-May-1997 2048 bytes
| Unix D/ Directory 14:13:54 06-May-1997 2048 bytes
| UnixComs D/ Directory 14:28:40 06-May-1997 2048 bytes
|
| *ex ^.^.^ { | awk "{ if ($5 ~ /Aug/) { sum+=$6; print } } END { print sum }" }
| C D/ Directory 18:35:27 03-Aug-1997 2048 bytes
| Mail D/ Directory 18:18:18 07-Aug-1997 2048 bytes
| 4096
How it works
------------
Basically I'm just using the built in redirection system to a better effect;
Temporary files are stored in the SqPipes$Path directory and should be
deleted after the commands exit. Error handling is rudimentary but should be
sufficient for 99% of occassions.
Disclaimer
----------
The author accepts no responsibility for any problems which this application
may cause or loss of data resulting in its use. You may not release this
application in any way shape or form without my express permission.
Source code
-----------
Source code for this module is not currently available. Contact
Gerph@innocent.com for details.
Bugs
----
There are a few bugs in it. To be honest (and I really mean this) I wasn't
actually at the stage at which it should have worked when it did, it was
still in the 'let's try this and see what happens' stage. As such there maybe
some fundamental things I've missed out. If there are I'm sorry, and a quick
mail to me would be muchly appreciated.
Major bug which I need to find the cause of : 'Bad vector release' - see
example on error handling (only happens in taskwindows).
Contact
-------
Any comments, queries, donations or bug reports can be sent to Justin
Fletcher at :
E-Mail : Gerph@innocent.com
URL : http://users.essex.ac.uk/users/gerph
IRC : On #Acorn as Gerph
Finger : finger jrflet@sunlab1.essex.ac.uk
Tel : (01842) 813979
Snail Mail :
Justin Fletcher
�Galadriel�
17b Cromwell Road,
Weeting,
Brandon,
Suffolk.
IP27 0QT
History
-------
Version 1.00 : 09 Aug 1997
A twinkle in my eye this morning, which left my screaming that
my head would explode by lunch time (C redirection fiddle), and
finally worked at around 7pm.
Version 1.01 : 10 Aug 1997
Error handling ? What's that ? Oh, well I suppose I'd better
add some then. Oh... And maybe I should remove those little
memory leaks that are going around.
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*
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00000060 65 72 73 69 6f 6e 20 31 2e 30 31 20 28 31 30 20 |ersion 1.01 (10 |
00000070 41 75 67 20 31 39 39 37 29 0a 20 20 20 20 20 0a |Aug 1997). .|
00000080 49 6e 74 72 6f 64 75 63 74 69 6f 6e 0a 2d 2d 2d |Introduction.---|
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000002d0 4e 6f 74 69 63 65 20 74 68 61 74 20 74 68 65 20 |Notice that the |
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00000340 73 69 63 61 6c 6c 79 20 61 6e 79 20 6c 69 6e 65 |sically any line|
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000009a0 31 31 20 30 31 38 36 41 32 42 34 20 30 31 38 33 |11 0186A2B4 0183|
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00000a60 65 6c 70 20 6f 6e 20 6b 65 79 77 6f 72 64 20 57 |elp on keyword W|
00000a70 69 6d 70 54 61 73 6b 0a 7c 20 3d 3d 3e 20 48 65 |impTask.| ==> He|
00000a80 6c 70 20 6f 6e 20 6b 65 79 77 6f 72 64 20 57 69 |lp on keyword Wi|
00000a90 6d 70 57 72 69 74 65 44 69 72 0a 7c 20 3d 3d 3e |mpWriteDir.| ==>|
00000aa0 20 48 65 6c 70 20 6f 6e 20 6b 65 79 77 6f 72 64 | Help on keyword|
00000ab0 20 57 69 6d 70 44 72 61 67 44 65 6c 61 79 0a 7c | WimpDragDelay.||
00000ac0 20 3d 3d 3e 20 48 65 6c 70 20 6f 6e 20 6b 65 79 | ==> Help on key|
00000ad0 77 6f 72 64 20 57 69 6d 70 44 72 61 67 4d 6f 76 |word WimpDragMov|
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00000b00 6c 65 43 6c 69 63 6b 44 65 6c 61 79 0a 7c 20 3d |leClickDelay.| =|
00000b10 3d 3e 20 48 65 6c 70 20 6f 6e 20 6b 65 79 77 6f |=> Help on keywo|
00000b20 72 64 20 57 69 6d 70 44 6f 75 62 6c 65 43 6c 69 |rd WimpDoubleCli|
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00000b40 70 20 6f 6e 20 6b 65 79 77 6f 72 64 20 57 69 6d |p on keyword Wim|
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00001b50 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 6d | m|
00001b60 79 20 68 65 61 64 20 77 6f 75 6c 64 20 65 78 70 |y head would exp|
00001b70 6c 6f 64 65 20 62 79 20 6c 75 6e 63 68 20 74 69 |lode by lunch ti|
00001b80 6d 65 20 28 43 20 72 65 64 69 72 65 63 74 69 6f |me (C redirectio|
00001b90 6e 20 66 69 64 64 6c 65 29 2c 20 61 6e 64 0a 20 |n fiddle), and. |
00001ba0 20 20 20 20 20 20 20 20 20 20 20 20 20 20 66 69 | fi|
00001bb0 6e 61 6c 6c 79 20 77 6f 72 6b 65 64 20 61 74 20 |nally worked at |
00001bc0 61 72 6f 75 6e 64 20 37 70 6d 2e 0a 0a 56 65 72 |around 7pm...Ver|
00001bd0 73 69 6f 6e 20 31 2e 30 31 20 3a 20 31 30 20 41 |sion 1.01 : 10 A|
00001be0 75 67 20 31 39 39 37 0a 20 20 20 20 20 20 20 20 |ug 1997. |
00001bf0 20 20 20 20 20 20 20 45 72 72 6f 72 20 68 61 6e | Error han|
00001c00 64 6c 69 6e 67 20 3f 20 57 68 61 74 27 73 20 74 |dling ? What's t|
00001c10 68 61 74 20 3f 20 4f 68 2c 20 77 65 6c 6c 20 49 |hat ? Oh, well I|
00001c20 20 73 75 70 70 6f 73 65 20 49 27 64 20 62 65 74 | suppose I'd bet|
00001c30 74 65 72 0a 20 20 20 20 20 20 20 20 20 20 20 20 |ter. |
00001c40 20 20 20 61 64 64 20 73 6f 6d 65 20 74 68 65 6e | add some then|
00001c50 2e 20 4f 68 2e 2e 2e 20 41 6e 64 20 6d 61 79 62 |. Oh... And mayb|
00001c60 65 20 49 20 73 68 6f 75 6c 64 20 72 65 6d 6f 76 |e I should remov|
00001c70 65 20 74 68 6f 73 65 20 6c 69 74 74 6c 65 0a 20 |e those little. |
00001c80 20 20 20 20 20 20 20 20 20 20 20 20 20 20 6d 65 | me|
00001c90 6d 6f 72 79 20 6c 65 61 6b 73 20 74 68 61 74 20 |mory leaks that |
00001ca0 61 72 65 20 67 6f 69 6e 67 20 61 72 6f 75 6e 64 |are going around|
00001cb0 2e 0a |..|
00001cb2 
.