Hi,
I am all for implementing a library procedure, or class, to do this as part of
the Unicon distribution, if one is not there already. I am wondering why I
haven't noticed someone chime in with the stat() function, it is the building
block one uses to read file attributes, determine if something is a directory,
etc. I do know the Unicon book has an example program that walks through
directories recursively.
Cheers,
Clint
________________________________
From: Sergey Logichev <[email protected]>
Sent: Monday, January 12, 2015 3:05 AM
To: David Gamey; Jafar Al-Gharaibeh
Cc: Unicon group
Subject: Re: [Unicon-group] Walk of file directory
David,
Ok, I will try to implement it myself at first. If I will be in trouble I ask
you help, sure. In any case I will inform Unicon group about it.
It would be great to implement file search directly in Unicon. As Jafar
mentioned, we already may do it within current directory with help of open()
function. For example, open("*.icn") does filtering of icn files in the
directory. Next step would be logical to do search recursively in all
subdirectories. For example, something like open("rootdir/*.icn","recursively").
Sergey
11.01.2015, 22:25, "David Gamey" <[email protected]>:
Sergey,
I am responsible for much of the Rosetta code contributions (thanks also to
Steve, Andrew, Matt, Peter, and about 4 others) and this one in particular
dating from 2010. As I recall this was before the multi-threading versions were
widely available. I think multi-threading is underrepresented in Rosetta/Unicon.
If you come up with a multi-threading version, we should add it to the post as
an alternative version. If you don't feel comfortable doing this, post the
code and I can add it.
David
________________________________
From: Sergey Logichev <[email protected]<mailto:[email protected]>>
To: Jafar Al-Gharaibeh <[email protected]<mailto:[email protected]>>
Cc: Unicon group
<[email protected]<mailto:[email protected]>>
Sent: Sunday, January 11, 2015 1:16 AM
Subject: Re: [Unicon-group] Walk of file directory
Jafar,
Thank you for a whole bundle of advices and suggestions! Threads are worth to
try. The thought of search by file attributes is very useful too. Your
suggestion about slow I/O partly is right. For UNIX I tried the program on
Raspberry Pi with 6 Class microSD as HDD (it's slow, agree). But for Windows it
was quite fast HDD. It would be interesting to compare performance of the
program on Windows with classic approach based on Win32 _FINDFIRST, _FINDNEXT
functions. I have threaded Delphi/Lazarus implementations of this algorithm.
Feel that it will be faster but in which degree?
Sergey
10.01.2015, 21:50, "Jafar Al-Gharaibeh"
<[email protected]<mailto:[email protected]>>:
Sergey,
There are so many things that came to mind when I saw your program.
1- At the end of your email, sourceforge ad says "Go Parallel", Which is not a
bad idea for this highly parallel application.
There is a similar program "wordcount" listed in my dissertation (available on
unicon.org<http://unicon.org/>) that go through directories and count words in
every file using threads (Chapter 7, page 107)
2- Unicon open() already supports " pattern matching that would greatly (I
believe) speedup your program. For example you can do this:
L := open("*.icn")
to get a list of all of Unicon source files in the current directory.
Note: It would be nice if there were a way to tell open() to return files not
only based on a pattern, but also on file attribute to allow something like
"get me all directories in the current directory", or "get me all read only
file". There are a lot of situations where filtering directory names for
example is very useful - like this program
3- The program on Rosetta Code is not optimized for speed. You can minimize the
number of lists created and put() by careful rewriting of the code.
4- Depending on how deep the directory tree is, there might be a lot of I/O
going on. A slow disk might limit how fast you can go regardless of how
optimized your code is.
I will share results if get around trying any of these options.
Cheers,
Jafar
On Sat, Jan 10, 2015 at 5:51 AM, Sergey Logichev
<[email protected]<mailto:[email protected]>> wrote:
Hello all!
Now I investigate the best approach to get list of files in specified directory
and beneath in Unicon.
I found excellent example at rosettacode.org<http://rosettacode.org/>:
http://rosettacode.org/wiki/Walk_a_directory/Recursively#Icon_and_Unicon
I reconstructed this one to implement matching of filenames to specified
pattern (regular expression). My program recursively walks a directory and
prints appropriate filenames. The same as dir (ls) does. All working fine
except performance. If directory has a lot of subdirs the search may took 10-20
seconds before starting output. Could you provide some advices how to enchance
the performance?
Some notes how to make and use. Unpack content of udir.zip to your local
directory. Define which environment you use in env.icn file - uncomment line
"$define _UNIX 1" in the case of UNIX. Nothing to do in the case of Windows.
Make udir program:
unicon -c futils.icn
unicon -c options.icn
unicon -c regexp.icn
unicon udir.icn
Usage: udir -f<filemask>
for example: udir -f*.icn
shall list of icn files in the current dir and all its subdirectories.
Best regards,
Sergey Logichev
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