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Re: "Deep recursion" error

by sundialsvc4 (Abbot)
on Jun 28, 2013 at 16:28 UTC ( #1041285=note: print w/replies, xml ) Need Help??

in reply to "Deep recursion" error

Even if you don’t choose to use a File::Find type module, you certainly can use their core techniques ... which don’t involve recursion.   Instead, they use a simple push-down stack.

You start by pushing the starting location on the stack.   Then, something like this:

while (the stack is not empty) { pop a name off the stack search that directory for entries: -- if it is "." or ".." then SKIP it. (Guess this is what you're +not doing.) -- if it is a directory, "push" or "unshift" the fully-qualified n +ame onto the stack. -- if it is a file, process it, or stack it on another queue it to + be processed soon. }

If you push the names, you get a “depth-first” search; if you unshift them, “breadth-first.”

This also circumvents another file-system bugaboo, especially noticeable in Windows:   the number of active “searches” that you can actually have going at one time, and the problem of interference between them.   Only one search is actually going-on at one time.

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[choroba]: but gurus say they in fact happen left to right, but we understand them wrongly
[marioroy]: bad gurus :)
[choroba]: also, &> redirects both at the same time
[marioroy]: erix are you using csh
Discipulus uh the link was for cmd.exe the bash one
[marioroy]: If yes, for redirection to work, one might do the following
[marioroy]: `bash -c "clang --version 2>/dev/null"`
[choroba]: Sane people don't use csh
[marioroy]: the 1>&2 will work, not shown
[marioroy]: sorry, did not know which if cmd.exe or unix (bash)

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