Re: [racket-users] Re: get-file-list filter

[David Storrs]

You can also, as you pointed out, generate the string programmatically.  If
you do, you'll get mileage out of the string-upcase and string-downcase
functions:

(define basestr (string-join (map string-downcase '(...jpg jpeg etc)) ";")
(define str (string-append basestr ";" (string-upcase basestr)))



On Tue, Feb 21, 2017 at 1:55 AM, Alex Harsanyi 
wrote:

> On Tuesday, February 21, 2017 at 11:52:49 AM UTC+8, Lehi Toskin wrote:
> > In `get-file-list`  there is a filter argument that can be passed to the
> function such that when going through a directory it'll only list
> directories and those files in the filter (separated by a semicolon). This
> can get rather unruly when the filter is rather large. At current count, I
> have a filter of 14 different file extensions accounting for spelling or
> case (e.g. "*.jpg;*.jpeg;*.JPG;*.JPEG"). Is there a way to do this more
> programmatically? I don't mean using a procedure to create the string, but
> that instead of a string it'd be, say, a predicate.
> >
> > In various GUI programs, the selection would be simply "All Images" or
> "Any" without specifying exactly what list of file extensions it's
> filtering. I suppose that behavior itself is fine, which would mean hiding
> the file extensions from the filter choice and only showing the name of the
> filter.
>
> The documentation for get-file-list (well, actually get-file) suggests
> that it uses a platform specific dialog box.  On windows platforms, I
> suspect  that would be GetOpenFileName which accepts filter string in the
> same format as required by get-file-list.  It is likely that the filter is
> passed directly to the windows function and as such, it has to be a string.
>
> This was just a long way of saying that you cannot have a predicate for
> the filter, at least not while using the platform specific "File Open"
> dialog boxes.
>
> However, the documentation does have an example for a shorted pattern for
> JPEG files: "*.jp*g"
>
> Best regards,
> Alex.
>
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[racket-users] Re: get-file-list filter

[Alex Harsanyi]

On Tuesday, February 21, 2017 at 11:52:49 AM UTC+8, Lehi Toskin wrote:
> In `get-file-list`  there is a filter argument that can be passed to the 
> function such that when going through a directory it'll only list directories 
> and those files in the filter (separated by a semicolon). This can get rather 
> unruly when the filter is rather large. At current count, I have a filter of 
> 14 different file extensions accounting for spelling or case (e.g. 
> "*.jpg;*.jpeg;*.JPG;*.JPEG"). Is there a way to do this more 
> programmatically? I don't mean using a procedure to create the string, but 
> that instead of a string it'd be, say, a predicate.
> 
> In various GUI programs, the selection would be simply "All Images" or "Any" 
> without specifying exactly what list of file extensions it's filtering. I 
> suppose that behavior itself is fine, which would mean hiding the file 
> extensions from the filter choice and only showing the name of the filter.

The documentation for get-file-list (well, actually get-file) suggests that it 
uses a platform specific dialog box.  On windows platforms, I suspect  that 
would be GetOpenFileName which accepts filter string in the same format as 
required by get-file-list.  It is likely that the filter is passed directly to 
the windows function and as such, it has to be a string.

This was just a long way of saying that you cannot have a predicate for the 
filter, at least not while using the platform specific "File Open" dialog boxes.

However, the documentation does have an example for a shorted pattern for JPEG 
files: "*.jp*g"

Best regards,
Alex.

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