How do I ask the FileSystem to resolve a relative path?

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How do I ask the FileSystem to resolve a relative path?

Hannes Hirzel
Hello

This is a follow up question to 'How do I make sure a directory exists?'

The answer to that question was

       dir := FileSystem workingDirectory / '..' / 'public'.
       dir ensureCreateDirectory.


Now I want to create a writeStream.

       dir writeStream

gives 'Unable to open file'


It seems that I need to ask to resolve the relative path first.
How does the proper code idiom look like?


Regards

Hannes

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Re: How do I ask the FileSystem to resolve a relative path?

Sven Van Caekenberghe-2


> On 11 Mar 2018, at 09:42, H. Hirzel <[hidden email]> wrote:
>
> Hello
>
> This is a follow up question to 'How do I make sure a directory exists?'
>
> The answer to that question was
>
>       dir := FileSystem workingDirectory / '..' / 'public'.
>       dir ensureCreateDirectory.
>
>
> Now I want to create a writeStream.
>
>       dir writeStream
>
> gives 'Unable to open file'

You want to write to a directory ?

You probably mean

dir := FileSystem workingDirectory / '..' / 'public'.
dir ensureCreateDirectory.
(dir / 'foo.txt') writeStreamDo: [ :out | out << 'bar' ].

You are probably also looking for

dir canonicalize.
(dir / 'foo.txt') canonicalize.

> It seems that I need to ask to resolve the relative path first.
> How does the proper code idiom look like?
>
>
> Regards
>
> Hannes
>


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Re: How do I ask the FileSystem to resolve a relative path?

John Pfersich
or try

dir := (FileSystem workingDirectory / '..' / 'public' / 'testing' / 'test2.txt') ensureCreateFile.
dir writeStream.

On Sun, Mar 11, 2018 at 1:16 AM, Sven Van Caekenberghe <[hidden email]> wrote:


> On 11 Mar 2018, at 09:42, H. Hirzel <[hidden email]> wrote:
>
> Hello
>
> This is a follow up question to 'How do I make sure a directory exists?'
>
> The answer to that question was
>
>       dir := FileSystem workingDirectory / '..' / 'public'.
>       dir ensureCreateDirectory.
>
>
> Now I want to create a writeStream.
>
>       dir writeStream
>
> gives 'Unable to open file'

You want to write to a directory ?

You probably mean

dir := FileSystem workingDirectory / '..' / 'public'.
dir ensureCreateDirectory.
(dir / 'foo.txt') writeStreamDo: [ :out | out << 'bar' ].

You are probably also looking for

dir canonicalize.
(dir / 'foo.txt') canonicalize.

> It seems that I need to ask to resolve the relative path first.
> How does the proper code idiom look like?
>
>
> Regards
>
> Hannes
>



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Re: How do I ask the FileSystem to resolve a relative path?

Sven Van Caekenberghe-2


> On 11 Mar 2018, at 10:39, john pfersich <[hidden email]> wrote:
>
> or try
>
> dir := (FileSystem workingDirectory / '..' / 'public' / 'testing' / 'test2.txt') ensureCreateFile.
> dir writeStream.

Indeed!

> On Sun, Mar 11, 2018 at 1:16 AM, Sven Van Caekenberghe <[hidden email]> wrote:
>
>
> > On 11 Mar 2018, at 09:42, H. Hirzel <[hidden email]> wrote:
> >
> > Hello
> >
> > This is a follow up question to 'How do I make sure a directory exists?'
> >
> > The answer to that question was
> >
> >       dir := FileSystem workingDirectory / '..' / 'public'.
> >       dir ensureCreateDirectory.
> >
> >
> > Now I want to create a writeStream.
> >
> >       dir writeStream
> >
> > gives 'Unable to open file'
>
> You want to write to a directory ?
>
> You probably mean
>
> dir := FileSystem workingDirectory / '..' / 'public'.
> dir ensureCreateDirectory.
> (dir / 'foo.txt') writeStreamDo: [ :out | out << 'bar' ].
>
> You are probably also looking for
>
> dir canonicalize.
> (dir / 'foo.txt') canonicalize.
>
> > It seems that I need to ask to resolve the relative path first.
> > How does the proper code idiom look like?
> >
> >
> > Regards
> >
> > Hannes
> >
>
>
>


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Re: How do I ask the FileSystem to resolve a relative path?

Hannes Hirzel
The first solution given by Sven works fine.

    dir := FileSystem workingDirectory / '..' / 'public'.
    dir ensureCreateDirectory.
    (dir / 'myFile.txt') writeStreamDo: [ :out | out << 'Hello World!' ].


The second version

    obj := (FileSystem workingDirectory / '..' / 'public' / 'testing'
/ 'test2.txt') ensureCreateFile.
    obj writeStream

gives a #streamError in the class FileHandle. This is for Pharo 6.1



On 3/11/18, Sven Van Caekenberghe <[hidden email]> wrote:

>
>
>> On 11 Mar 2018, at 10:39, john pfersich <[hidden email]> wrote:
>>
>> or try
>>
>> dir := (FileSystem workingDirectory / '..' / 'public' / 'testing' /
>> 'test2.txt') ensureCreateFile.
>> dir writeStream.
>
> Indeed!
>
>> On Sun, Mar 11, 2018 at 1:16 AM, Sven Van Caekenberghe <[hidden email]>
>> wrote:
>>
>>
>> > On 11 Mar 2018, at 09:42, H. Hirzel <[hidden email]> wrote:
>> >
>> > Hello
>> >
>> > This is a follow up question to 'How do I make sure a directory
>> > exists?'
>> >
>> > The answer to that question was
>> >
>> >       dir := FileSystem workingDirectory / '..' / 'public'.
>> >       dir ensureCreateDirectory.
>> >
>> >
>> > Now I want to create a writeStream.
>> >
>> >       dir writeStream
>> >
>> > gives 'Unable to open file'
>>
>> You want to write to a directory ?
>>
>> You probably mean
>>
>> dir := FileSystem workingDirectory / '..' / 'public'.
>> dir ensureCreateDirectory.
>> (dir / 'foo.txt') writeStreamDo: [ :out | out << 'bar' ].
>>
>> You are probably also looking for
>>
>> dir canonicalize.
>> (dir / 'foo.txt') canonicalize.
>>
>> > It seems that I need to ask to resolve the relative path first.
>> > How does the proper code idiom look like?
>> >
>> >
>> > Regards
>> >
>> > Hannes
>> >
>>
>>
>>
>
>
>

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Re: How do I ask the FileSystem to resolve a relative path?

Alistair Grant
Hi Hannes,

On 11 March 2018 at 17:49, H. Hirzel <[hidden email]> wrote:

> The first solution given by Sven works fine.
>
>     dir := FileSystem workingDirectory / '..' / 'public'.
>     dir ensureCreateDirectory.
>     (dir / 'myFile.txt') writeStreamDo: [ :out | out << 'Hello World!' ].
>
>
> The second version
>
>     obj := (FileSystem workingDirectory / '..' / 'public' / 'testing'
> / 'test2.txt') ensureCreateFile.
>     obj writeStream
>
> gives a #streamError in the class FileHandle. This is for Pharo 6.1

I don't get any error in 6.1 or 7.0.

Maybe supply a call stack?

In case you aren't familiar with this, the debugger has a little
hamburger menu button to the right of "Through" which has "Copy Stack
to Clipboard".

Cheers,
Alistair

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Re: How do I ask the FileSystem to resolve a relative path?

John Pfersich
What OS are you using? My code was executed on Ubuntu 16.04.

Sent from my iPhone
Encrypted email at [hidden email]

> On Mar 11, 2018, at 10:37, Alistair Grant <[hidden email]> wrote:
>
> Hi Hannes,
>
>> On 11 March 2018 at 17:49, H. Hirzel <[hidden email]> wrote:
>> The first solution given by Sven works fine.
>>
>>    dir := FileSystem workingDirectory / '..' / 'public'.
>>    dir ensureCreateDirectory.
>>    (dir / 'myFile.txt') writeStreamDo: [ :out | out << 'Hello World!' ].
>>
>>
>> The second version
>>
>>    obj := (FileSystem workingDirectory / '..' / 'public' / 'testing'
>> / 'test2.txt') ensureCreateFile.
>>    obj writeStream
>>
>> gives a #streamError in the class FileHandle. This is for Pharo 6.1
>
> I don't get any error in 6.1 or 7.0.
>
> Maybe supply a call stack?
>
> In case you aren't familiar with this, the debugger has a little
> hamburger menu button to the right of "Through" which has "Copy Stack
> to Clipboard".
>
> Cheers,
> Alistair
>

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Re: How do I ask the FileSystem to resolve a relative path?

Guillermo Polito
Hi,

do not forget also that there is an entire chapter on FileSystem in here:


And I particularly recommend everybody dealing with files to read about how to manage encodings in here:


On Mon, Mar 12, 2018 at 7:09 AM, john pfersich <[hidden email]> wrote:
What OS are you using? My code was executed on Ubuntu 16.04.

Sent from my iPhone
Encrypted email at [hidden email]

> On Mar 11, 2018, at 10:37, Alistair Grant <[hidden email]> wrote:
>
> Hi Hannes,
>
>> On 11 March 2018 at 17:49, H. Hirzel <[hidden email]> wrote:
>> The first solution given by Sven works fine.
>>
>>    dir := FileSystem workingDirectory / '..' / 'public'.
>>    dir ensureCreateDirectory.
>>    (dir / 'myFile.txt') writeStreamDo: [ :out | out << 'Hello World!' ].
>>
>>
>> The second version
>>
>>    obj := (FileSystem workingDirectory / '..' / 'public' / 'testing'
>> / 'test2.txt') ensureCreateFile.
>>    obj writeStream
>>
>> gives a #streamError in the class FileHandle. This is for Pharo 6.1
>
> I don't get any error in 6.1 or 7.0.
>
> Maybe supply a call stack?
>
> In case you aren't familiar with this, the debugger has a little
> hamburger menu button to the right of "Through" which has "Copy Stack
> to Clipboard".
>
> Cheers,
> Alistair
>




--

   

Guille Polito

Research Engineer

Centre de Recherche en Informatique, Signal et Automatique de Lille

CRIStAL - UMR 9189

French National Center for Scientific Research - http://www.cnrs.fr


Web: http://guillep.github.io

Phone: +33 06 52 70 66 13

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Re: How do I ask the FileSystem to resolve a relative path?

Alistair Grant
On 12 March 2018 at 10:03, Guillermo Polito <[hidden email]> wrote:

>
> Hi,
>
> do not forget also that there is an entire chapter on FileSystem in here:
>
> http://files.pharo.org/books-pdfs/deep-into-pharo/2013-DeepIntoPharo-EN.pdf
>
> And I particularly recommend everybody dealing with files to read about how to manage encodings in here:
>
> http://files.pharo.org/books-pdfs/entreprise-pharo/2016-10-06-EnterprisePharo.pdf


Cool!  I wasn't aware of the section on character encoding, it's
probably the best introduction to character encoding I've read.

There is one important mistake in the examples.  On page 46 it gives
the following code:

'encoding-test.txt' asFileReference writeStreamDo: [ :out |
    (ZnCharacterWriteStream on: out binary encoding: #utf8)
        nextPutAll: 'Hello'; space; nextPutAll: 'Ελλάδα'; crlf;
nextPutAll: 'Les élèves français'; crlf ].


This won't work reliably as #writeStreamDo: (and #readStreamDo:) use
MultiByteFileStreams, which are not binary by default.

It really should be (in Pharo 7, I haven't checked pharo 6)
#binaryWriteStreamDo: and #binaryReadStreamDo:, i.e.:

'encoding-test.txt' asFileReference binaryWriteStreamDo: [ :out |
    (ZnCharacterWriteStream on: out binary encoding: #utf8)
        nextPutAll: 'Hello'; space; nextPutAll: 'Ελλάδα'; crlf;
nextPutAll: 'Les élèves français'; crlf ].


Cheers,
Alistair

(I know I should submit a PR for this, but I'm suffering a personal
interrupt stack overflow at the moment)

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Re: How do I ask the FileSystem to resolve a relative path?

Sven Van Caekenberghe-2
Hi Alistair,

> On 12 Mar 2018, at 19:06, Alistair Grant <[hidden email]> wrote:
>
> On 12 March 2018 at 10:03, Guillermo Polito <[hidden email]> wrote:
>>
>> Hi,
>>
>> do not forget also that there is an entire chapter on FileSystem in here:
>>
>> http://files.pharo.org/books-pdfs/deep-into-pharo/2013-DeepIntoPharo-EN.pdf
>>
>> And I particularly recommend everybody dealing with files to read about how to manage encodings in here:
>>
>> http://files.pharo.org/books-pdfs/entreprise-pharo/2016-10-06-EnterprisePharo.pdf
>
>
> Cool!  I wasn't aware of the section on character encoding, it's
> probably the best introduction to character encoding I've read.

Thanks.

> There is one important mistake in the examples.  On page 46 it gives
> the following code:
>
> 'encoding-test.txt' asFileReference writeStreamDo: [ :out |
>    (ZnCharacterWriteStream on: out binary encoding: #utf8)
>        nextPutAll: 'Hello'; space; nextPutAll: 'Ελλάδα'; crlf;
> nextPutAll: 'Les élèves français'; crlf ].
>
>
> This won't work reliably as #writeStreamDo: (and #readStreamDo:) use
> MultiByteFileStreams, which are not binary by default.

It does work, you missed the #binary message sent to out.

> It really should be (in Pharo 7, I haven't checked pharo 6)
> #binaryWriteStreamDo: and #binaryReadStreamDo:, i.e.:
>
> 'encoding-test.txt' asFileReference binaryWriteStreamDo: [ :out |
>    (ZnCharacterWriteStream on: out binary encoding: #utf8)
>        nextPutAll: 'Hello'; space; nextPutAll: 'Ελλάδα'; crlf;
> nextPutAll: 'Les élèves français'; crlf ].

This is indeed better (but I am not sure #binaryWriteStreamDo: was available in the past). In this case, the #binary message sent to out should be dropped.

Sven

> Cheers,
> Alistair
>
> (I know I should submit a PR for this, but I'm suffering a personal
> interrupt stack overflow at the moment)


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Re: How do I ask the FileSystem to resolve a relative path?

Alistair Grant
Hi Sven,

On 12 March 2018 at 19:38, Sven Van Caekenberghe <[hidden email]> wrote:

> Hi Alistair,
>
>> On 12 Mar 2018, at 19:06, Alistair Grant <[hidden email]> wrote:
>>
>> On 12 March 2018 at 10:03, Guillermo Polito <[hidden email]> wrote:
>>>
>>> Hi,
>>>
>>> do not forget also that there is an entire chapter on FileSystem in here:
>>>
>>> http://files.pharo.org/books-pdfs/deep-into-pharo/2013-DeepIntoPharo-EN.pdf
>>>
>>> And I particularly recommend everybody dealing with files to read about how to manage encodings in here:
>>>
>>> http://files.pharo.org/books-pdfs/entreprise-pharo/2016-10-06-EnterprisePharo.pdf
>>
>>
>> Cool!  I wasn't aware of the section on character encoding, it's
>> probably the best introduction to character encoding I've read.
>
> Thanks.
>
>> There is one important mistake in the examples.  On page 46 it gives
>> the following code:
>>
>> 'encoding-test.txt' asFileReference writeStreamDo: [ :out |
>>    (ZnCharacterWriteStream on: out binary encoding: #utf8)
>>        nextPutAll: 'Hello'; space; nextPutAll: 'Ελλάδα'; crlf;
>> nextPutAll: 'Les élèves français'; crlf ].
>>
>>
>> This won't work reliably as #writeStreamDo: (and #readStreamDo:) use
>> MultiByteFileStreams, which are not binary by default.
>
> It does work, you missed the #binary message sent to out.

You're right, of course.  My apologies (I did miss the #binary).

Cheers,
Alistair


>> It really should be (in Pharo 7, I haven't checked pharo 6)
>> #binaryWriteStreamDo: and #binaryReadStreamDo:, i.e.:
>>
>> 'encoding-test.txt' asFileReference binaryWriteStreamDo: [ :out |
>>    (ZnCharacterWriteStream on: out binary encoding: #utf8)
>>        nextPutAll: 'Hello'; space; nextPutAll: 'Ελλάδα'; crlf;
>> nextPutAll: 'Les élèves français'; crlf ].
>
> This is indeed better (but I am not sure #binaryWriteStreamDo: was available in the past). In this case, the #binary message sent to out should be dropped.
>
> Sven
>
>> Cheers,
>> Alistair
>>
>> (I know I should submit a PR for this, but I'm suffering a personal
>> interrupt stack overflow at the moment)