Re: [racket-users] Built-in way to list all children of a directory?

[Ben Greenman]

The predicate can be any function.

All files: `(find-files (lambda (x) #true) start-path)`
All pdf files: `(find-files (lambda (x) (equal? #".pdf" (path-get-extension
x))) some-path)`

There's also the `file/glob` module.
All pdf files: `(glob (build-path some-path "**" "*.pdf"))`
Iterator for all files: `(in-glob (build-path some-path "**"))`

On Tue, Jun 27, 2017 at 10:17 PM, Glenn Hoetker  wrote:

> Struggling as a newbie with the documentation for find-files. In
> particular, the "predicate" part of
>
> (find-files
> predicate
>  [  start-path]
> #:skip-filtered-directory? skip-filtered-directory?
> #:follow-links? follow-links?)
>
> Can anyone offer a working example?  All file, all pdfs. Doesn't really
> matter. Just something concrete to get me started. Many thanks!
>
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Re: [racket-users] Built-in way to list all children of a directory?

[Glenn Hoetker]

Struggling as a newbie with the documentation for find-files. In particular, 
the "predicate" part of 

(find-files  
predicate
 [  start-path]  
#:skip-filtered-directory? skip-filtered-directory?  
#:follow-links? follow-links?)

Can anyone offer a working example?  All file, all pdfs. Doesn't really matter. 
Just something concrete to get me started. Many thanks!

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Re: [racket-users] Built-in way to list all children of a directory?

[Matthew Flatt]

At Tue, 27 Jun 2017 18:31:21 -0700 (PDT), Glenn Hoetker wrote:
> As far as I can tell, (directory-list some-path) yields a list of
> files and directories immediately below some-path. I wish to capture
> all files and directories in some-path or any of the sub-directories
> of some-path.

I would use `in-directory` with one of the `for` forms, but see also
`find-files` and `fold-files`.

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Re: [racket-users] Built-in way to list all children of a directory?

[Matthew Butterick]

> On Jun 27, 2017, at 6:31 PM, Glenn Hoetker  > wrote:
> 
> Naive question, here.  As far as I can tell, (directory-list some-path) 
> yields a list of files and directories immediately below some-path. I wish to 
> capture all files and directories in some-path or any of the sub-directories 
> of some-path.  

`in-directory`, which is designed to be used within a `for` loop:

http://docs.racket-lang.org/reference/sequences.html?q=in-directory#%28def._%28%28lib._racket%2Fprivate%2Fbase..rkt%29._in-directory%29%29
 


Use with `for/list` if you want to gather the results into a list.

Use `#:when` to restrict the results.

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[racket-users] Built-in way to list all children of a directory?

[Glenn Hoetker]

Naive question, here.  As far as I can tell, (directory-list some-path) yields 
a list of files and directories immediately below some-path. I wish to capture 
all files and directories in some-path or any of the sub-directories of 
some-path.  I didn't find an obvious option for doing so. Before I write my 
own--probably inefficient--way of doing so, I wanted to ask if there was a 
built-in command that would yield all the children of a path.  Many thanks.

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