Re: How to empty the Trash programmatically?

2010-04-17 Thread Flavio Donadio
People,


This my first post on this list, and I am very disappointed that I am chiming 
into this kind of conversation. This will be my only post on this subject and I 
think I can make myself very clear.

On 16/04/2010, at 14:22, Jayson Adams wrote:

 On Apr 16, 2010, at 9:46 AM, Kyle Sluder wrote:
 
 On Fri, Apr 16, 2010 at 9:30 AM, Jayson Adams jay...@circusponies.com 
 wrote:
 
 These kinds of preachy know-it-all rants are really tiresome, but 
 unfortunately they happen a lot on this list.
 
 They happen a lot on this list because that kind of attention is what
 sets the Mac development community apart from that of other operating
 systems. Developers—especially the kind who take the time to hang out
 here—really care about the overall user experience and quality of the
 platform. When people come asking for help with things that could
 break the paradigm, we respond accordingly, so as to protect the
 deserved reputation of the platform as a whole.
 
 Preachy, know-it-all rants are never an appropriate response.  I do already 
 understand how the people who do this kind of thing justify it as being OK.

I don't think ranting is a good counter-attack on ranting. I mean, if you don't 
like the attitude, don't act in the same manner.

Sure, assuming that one is writing malware, just because he/she wants to empty 
the trash programatically, is kind of stupid and paranoid.

But I agree with Kyle when he talks about the kind [of people] who take the 
time to hang out here. People have no obligation to answer questions. And 
people asking questions should be clear, because time is valuable for 
everybody. Period.


Cheers,
Flavio

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Dave Carrigan

On Apr 15, 2010, at 11:05 PM, Oleg Krupnov wrote:

 I could delete all files from /Users/account/.Trash folder, but I am
 not sure if it's a legitimate way.

It's not, because it will anger anybody who prefers to empty the trash 
securely.

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Stephen J. Butler
On Fri, Apr 16, 2010 at 1:05 AM, Oleg Krupnov oleg.krup...@gmail.com wrote:
 Hi,

 Is there a way to programmatically empty the Trash can?

This code is ancient, but it should give you an idea where to start
writing a modern version:

http://developer.apple.com/mac/library/samplecode/MoreAppleEvents/Listings/MoreFinderEvents_c.html

In particular: MoreFEEmptyTrash().
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Charles Srstka
On Apr 16, 2010, at 1:05 AM, Oleg Krupnov wrote:

 Hi,
 
 Is there a way to programmatically empty the Trash can?
 
 I could delete all files from /Users/account/.Trash folder, but I am
 not sure if it's a legitimate way. Also it will not include trashed
 files from other volumes, stored in /.Trashes/account id. The latter
 are generally not accessible even to list them without root
 permissions, so there is no easy way to empty that part of the Trash.
 
 Another related question would be how to measure the total size of all
 files in the Trash (other than scanning), including the files on other
 volumes.
 
 Thanks!

Why exactly do you want to do that?

Charles
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jens Alfke

On Apr 15, 2010, at 11:05 PM, Oleg Krupnov wrote:

 Is there a way to programmatically empty the Trash can?

Send the Finder an ‘Empty Trash’ AppleEvent. You can use the scripting bridge 
API to do this pretty easily.

—Jens___

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Oleg Krupnov
What is securely in this context?

On Fri, Apr 16, 2010 at 9:14 AM, Dave Carrigan d...@rudedog.org wrote:

 On Apr 15, 2010, at 11:05 PM, Oleg Krupnov wrote:

 I could delete all files from /Users/account/.Trash folder, but I am
 not sure if it's a legitimate way.

 It's not, because it will anger anybody who prefers to empty the trash 
 securely.


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Re: How to empty the Trash programmatically?

2010-04-16 Thread Oleg Krupnov
Yes, I see that I can use AppleScript. But is this really the only
way? I would like to avoid Finder UIs popping up.

On Fri, Apr 16, 2010 at 9:30 AM, Jens Alfke j...@mooseyard.com wrote:

 On Apr 15, 2010, at 11:05 PM, Oleg Krupnov wrote:

 Is there a way to programmatically empty the Trash can?

 Send the Finder an ‘Empty Trash’ AppleEvent. You can use the scripting bridge 
 API to do this pretty easily.

 —Jens
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Dave Keck
tell application Finder to empty trash without warns before emptying
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Oleg Krupnov
But the progress-bar window will still pop up...

On Fri, Apr 16, 2010 at 9:41 AM, Dave Keck davek...@gmail.com wrote:
 tell application Finder to empty trash without warns before emptying

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Dave Keck
 But the progress-bar window will still pop up...

I would consider that a part of the high-level concept of emptying
the trash. NSFileManager is probably what you're looking for, in
combination with the mentioned AppleScript to update the trash icon:

http://pastie.org/922743

Needs error-checking, etc.
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Dave Keck
Forgive me for posting before reading all of your original message -
having done so I see my response doesn't help much. Sorry for the
noise.
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Graham Cox
Don't.

The only app that the user wants to empty the trash is Finder, not yours. If 
they want it emptied (or emptied securely), they'll go to the Finder and use 
the menu there. It's OK for your app to move stuff to the trash as long as it's 
clear to the user that will happen, but emptying it is not your business. The 
clue really is the fact that doing so is not supported directly by an API.

--Graham



On 16/04/2010, at 4:45 PM, Oleg Krupnov wrote:

 But the progress-bar window will still pop up...
 
 On Fri, Apr 16, 2010 at 9:41 AM, Dave Keck davek...@gmail.com wrote:
 tell application Finder to empty trash without warns before emptying
 
 

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jeremy Pereira

On 16 Apr 2010, at 08:22, Graham Cox wrote:

 Don't.
 
 The only app that the user wants to empty the trash is Finder, not yours. If 
 they want it emptied (or emptied securely), they'll go to the Finder and use 
 the menu there. It's OK for your app to move stuff to the trash as long as 
 it's clear to the user that will happen, but emptying it is not your 
 business. The clue really is the fact that doing so is not supported directly 
 by an API.

+1 to that.  Any application that emptied my Trash programmatically would find 
itself being the first new item in there.

 
 --Graham
 
 
 
 On 16/04/2010, at 4:45 PM, Oleg Krupnov wrote:
 
 But the progress-bar window will still pop up...
 
 On Fri, Apr 16, 2010 at 9:41 AM, Dave Keck davek...@gmail.com wrote:
 tell application Finder to empty trash without warns before emptying
 
 
 
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Matt Gough

On 16 Apr 2010, at 09:46:27, Jeremy Pereira wrote:

 On 16 Apr 2010, at 08:22, Graham Cox wrote:
 
 Don't.
 
 The only app that the user wants to empty the trash is Finder, not yours. If 
 they want it emptied (or emptied securely), they'll go to the Finder and use 
 the menu there. It's OK for your app to move stuff to the trash as long as 
 it's clear to the user that will happen, but emptying it is not your 
 business. The clue really is the fact that doing so is not supported 
 directly by an API.
 
 +1 to that.  Any application that emptied my Trash programmatically would 
 find itself being the first new item in there.

To be fair though, if it is a user-initiated emptying and it is done via 
Finder, then I think it is fine to initiate a Trash emptying from another app. 
What isn't fine is for it to be done behind the user's back.

Matt Gough___

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jeremy Pereira

On 16 Apr 2010, at 10:29, Matt Gough wrote:

 
 On 16 Apr 2010, at 09:46:27, Jeremy Pereira wrote:
 
 On 16 Apr 2010, at 08:22, Graham Cox wrote:
 
 Don't.
 
 The only app that the user wants to empty the trash is Finder, not yours. 
 If they want it emptied (or emptied securely), they'll go to the Finder and 
 use the menu there. It's OK for your app to move stuff to the trash as long 
 as it's clear to the user that will happen, but emptying it is not your 
 business. The clue really is the fact that doing so is not supported 
 directly by an API.
 
 +1 to that.  Any application that emptied my Trash programmatically would 
 find itself being the first new item in there.
 
 To be fair though, if it is a user-initiated emptying and it is done via 
 Finder, then I think it is fine to initiate a Trash emptying from another 
 app. What isn't fine is for it to be done behind the user's back.

I'll concede that point but then why waste time duplicating a piece of 
functionality that is easily accessible from the dock?  Unless you are 
developing a dock/Finder replacement application.

 
 Matt Gough

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Raffael Cavallaro

On Apr 16, 2010, at 4:46 AM, Jeremy Pereira wrote:

 +1 to that.  Any application that emptied my Trash programmatically would 
 find itself being the first new item in there.

ditto.

soapbox
The whole reason the trash exists is so users do not accidentally lose data. It 
gives them the opportunity to review the contents of the trash before emptying 
it and thereby allows them to retrieve files that have inadvertently been 
placed there (accidental overly broad Finder selection before dragging to the 
trash is a very common example). I know users who have been on the platform 
since the very first 128K Mac who quite deliberately only empty the trash once 
a week or so. When this feature first appeared with the original Mac it was a 
godsend for many because one now had a very easy, OS supported method of 
effectively undeleting files.

Any app that empties the trash without the user's explicit consent is an 
unintended data loss waiting to happen. 

Don't do this. At least some of your users will be very unhappy. In extreme 
circumstances, you might even risk legal action because it could be argued that 
your app knowingly destroyed valuable user data without the user's knowledge or 
consent.
/soapbox

Raffael Cavallaro
raffaelcavall...@me.com





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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jens Alfke

On Apr 15, 2010, at 11:45 PM, Oleg Krupnov wrote:

 But the progress-bar window will still pop up…

Every once in a while a question on cocoa-dev gives me the uncomfortable 
feeling that someone is trying to get help in writing a piece of malware. This 
is one of them. No offense if that’s not your actual goal, Oleg, but take it as 
a sign of how negatively people perceive this behavior.

As others have said, if you give us more detail about what the actual purpose 
of this feature is, maybe we can suggest a better way to do it. Are you trying 
to make sure a particular file you created gets deleted securely? Emptying the 
trash isn’t the way to do it, then.

—Jens

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Oleg Krupnov
 The only app that the user wants to empty the trash is Finder, not yours. If 
 they want it emptied (or emptied securely), they'll go to the Finder and use 
 the menu there. It's OK for your app to move stuff to the trash as long as 
 it's clear to the user that will happen, but emptying it is not your 
 business. The clue really is the fact that doing so is not supported directly 
 by an API.

Graham, your point makes sense. I will think about it. In fact, I'm
now researching the possibility, not already implementing it.

 +1 to that.  Any application that emptied my Trash programmatically would 
 find itself being the first new item in there.

Jeremy, LOL :)

 To be fair though, if it is a user-initiated emptying and it is done via 
 Finder, then I think it is fine to initiate a Trash emptying from another 
 app. What isn't fine is for it to be done behind the user's back.

Matt, you're right, that's nearly how it would be implemented.

 Every once in a while a question on cocoa-dev gives me the uncomfortable 
 feeling that someone is trying to get help in writing a piece of malware. 
 This is one of them. No offense if that’s not your actual goal, Oleg, but 
 take it as a sign of how negatively people perceive this behavior.

 As others have said, if you give us more detail about what the actual purpose 
 of this feature is, maybe we can suggest a better way to do it. Are you 
 trying to make sure a particular file you created gets deleted securely? 
 Emptying the trash isn’t the way to do it, then.


No, Jens, your feeling is wrong. I'm developing an app for disk space
management, particularly for freeing up disk space. Actually you can
take a look: http://www.daisydiskapp.com. The new version of the app I
am developing will allow deleting files, and (maybe) emptying the
trash as well. So, it would be just a user-initiated command, a
shortcut to what Finder does. I am actually surprised my question
could raise any suspicion. Why? That's amusing... :)
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jens Alfke

On Apr 16, 2010, at 9:07 AM, Oleg Krupnov wrote:

 No, Jens, your feeling is wrong. I'm developing an app for disk space
 management, particularly for freeing up disk space. Actually you can
 take a look: http://www.daisydiskapp.com. The new version of the app I
 am developing will allow deleting files, and (maybe) emptying the
 trash as well. So, it would be just a user-initiated command, a
 shortcut to what Finder does.

That sounds fine, sorry for casting suspicion on your work :) Sending an event 
to the Finder is definitely the way to go.

 I am actually surprised my question
 could raise any suspicion. Why? That's amusing... :)

Well, we all know the Mac OS has a huge malware problem, so we have to be 
paranoid.

But to be serious, I think it’s always a good idea when you ask a question to 
give a little bit of context about the app feature that’s driving your 
development. It helps people give you better answers.

—Jens___

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jayson Adams

On Apr 16, 2010, at 12:22 AM, Graham Cox wrote:

 Don't.
 
 The only app that the user wants to empty the trash is Finder, not yours. If 
 they want it emptied (or emptied securely), they'll go to the Finder and use 
 the menu there. It's OK for your app to move stuff to the trash as long as 
 it's clear to the user that will happen, but emptying it is not your 
 business. The clue really is the fact that doing so is not supported directly 
 by an API.


Hey all of you of limited vision standing on your soapboxes - give me a break!  
He couldn't possibly be asking because he wants to create a Finder/desktop 
replacement app (like the Finder works so well we don't need one of those).  
These kinds of preachy know-it-all rants are really tiresome, but unfortunately 
they happen a lot on this list.

__jayson

Circus Ponies NoteBook - Organization for a Creative Mind
www.circusponies.com



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Re: How to empty the Trash programmatically?

2010-04-16 Thread Kyle Sluder
On Fri, Apr 16, 2010 at 9:30 AM, Jayson Adams jay...@circusponies.com wrote:
 Hey all of you of limited vision standing on your soapboxes - give me a 
 break!  He couldn't possibly be asking because he wants to create a 
 Finder/desktop replacement app (like the Finder works so well we don't need 
 one of those).  These kinds of preachy know-it-all rants are really tiresome, 
 but unfortunately they happen a lot on this list.

They happen a lot on this list because that kind of attention is what
sets the Mac development community apart from that of other operating
systems. Developers—especially the kind who take the time to hang out
here—really care about the overall user experience and quality of the
platform. When people come asking for help with things that could
break the paradigm, we respond accordingly, so as to protect the
deserved reputation of the platform as a whole.

--Kyle Sluder
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Raffael Cavallaro

On Apr 16, 2010, at 12:30 PM, Jayson Adams wrote:

 He couldn't possibly be asking because he wants to create a Finder/desktop 
 replacement app (like the Finder works so well we don't need one of those).

Before replacing the Finder with a superior implementation one might want to 
be aware of what the design goals, expected behavior, user expectations, and 
existing capabilities of the inferior existing Finder actually are.

The OP apparently isn't even aware of the Finder's Secure Empty Trash 
capability:

On Apr 16, 2010, at 2:34 AM, Oleg Krupnov wrote:

 What is securely in this context?

He tells us that it's for a disk cleaning utility. But emptying the trash will 
delete files on *other mounted volumes* as well, not just the disk being 
examined.

One shouldn't violate well established, expected platform behavior with the 
possible, unlikely exception of  those who are expertly knowledgeable about 
that well established, expected behavior. That doesn't appear to be the case 
here.

warmest regards,

Ralph


Raffael Cavallaro
raffaelcavall...@me.com





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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jayson Adams

On Apr 16, 2010, at 9:46 AM, Kyle Sluder wrote:

 On Fri, Apr 16, 2010 at 9:30 AM, Jayson Adams jay...@circusponies.com wrote:
 
 These kinds of preachy know-it-all rants are really tiresome, but 
 unfortunately they happen a lot on this list.
 
 They happen a lot on this list because that kind of attention is what
 sets the Mac development community apart from that of other operating
 systems. Developers—especially the kind who take the time to hang out
 here—really care about the overall user experience and quality of the
 platform. When people come asking for help with things that could
 break the paradigm, we respond accordingly, so as to protect the
 deserved reputation of the platform as a whole.


Preachy, know-it-all rants are never an appropriate response.  I do already 
understand how the people who do this kind of thing justify it as being OK.

__jayson

Circus Ponies NoteBook - Organization for a Creative Mind
www.circusponies.com



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Re: How to empty the Trash programmatically?

2010-04-16 Thread Paul Sanders
 But emptying the trash will delete files on *other mounted volumes* as well, 
 not just the disk being examined.

rm -rf ~/.Trash/*

For volumes other than the startup volume it is a little more complicated:

rm -rf /Volumes/volume_name/.Trashes/uid/*

The Finder seems to notice when you do this and keeps in sync.

Looking in these folders will also allow you to give the user some idea of what 
he is about to permanently delete.

Paul Sanders.
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Raffael Cavallaro

On Apr 16, 2010, at 1:43 PM, Paul Sanders wrote:

  But emptying the trash will delete files on *other mounted volumes* as 
  well, not just the disk being examined.
 
 rm -rf ~/.Trash/*
  
 For volumes other than the startup volume it is a little more complicated:
  
 rm -rf /Volumes/volume_name/.Trashes/uid/*
  
 The Finder seems to notice when you do this and keeps in sync.
  
 Looking in these folders will also allow you to give the user some idea of 
 what he is about to permanently delete.

Yes, I'm fully aware of what's going on when this happens. That's not the 
point. An application that purports to free disk space on a specific volume 
under examination should not be deleting user files on other volumes! He 
*wants* to empty the trash on *all* mounted volumes, possibly because he wants 
to erase the trash on a specific mounted volume under examination, not just 
~/.Trash/. This is a blunderbuss approach with a high likelihood of data loss:

User accidentally drags file A-file on volume A to trash with other files user 
did intend to trash. User finds that volume B is near full and examines it with 
OP's app. OP's app empties trash, deleting A-file, even though this frees zero 
additional space on volume-B. Oops!

Again, someone who doesn't have an expert knowledge of the intended operation 
of the Finder and an equally experienced knowledge of user expectations 
shouldn't be doing this.

warmest regards,

Ralph


Raffael Cavallaro
raffaelcavall...@me.com





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Re: How to empty the Trash programmatically?

2010-04-16 Thread Jens Alfke


On Apr 16, 2010, at 10:43 AM, Paul Sanders wrote:


rm -rf ~/.Trash/*

For volumes other than the startup volume it is a little more  
complicated:


rm -rf /Volumes/volume_name/.Trashes/uid/*


Please don't hardcode those paths. Use system APIs like FindFolder  
instead to locate the trash directory for a given volume. Or better  
yet, ask the Finder to do it, so the user gets progress information  
and feedback about errors.


—Jens___

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Paul Sanders
 Please don't hardcode those paths. Use system APIs like 
 FindFolder
 instead to locate the trash directory for a given volume.

Well, OK, but you get the idea.

Paul Sanders.



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Re: How to empty the Trash programmatically?

2010-04-16 Thread Quincey Morris
On Apr 16, 2010, at 11:03, Raffael Cavallaro wrote:

 Again, someone who doesn't have an expert knowledge of the intended operation 
 of the Finder and an equally experienced knowledge of user expectations 
 shouldn't be doing this.

In the [possibly] few moments that remain before this thread is moderated out 
of existence, I'd like to add that I have *some* sympathy for Jayson's 
perspective.

We keep shooting ourselves in the foot on this list by not first asking enough 
questions. Remember the thou shalt not forcibly turn the system alert on and 
to maximum volume thread last year? It turned out to be about hurricane 
warnings, and the good of mankind generally, and puppies. (No, sorry, not the 
puppies.)

In the current case, I was guessing that the trash-emptying was something to do 
with cleaning up in a school lab after classes were over. In such a case, 
forcibly emptying the trash might be a good thing (though the need to do it 
without user interface would be a bit puzzling). 

It turns out that wasn't a correct guess, and we're actually talking about disk 
space recovery. Yet, useful as the concept a disk-space-recovery application 
may be to some types of users, the concept of *reinforcing* a user's ignorance 
(not intended pejoratively) by making a 3rd-party app his/her *usual* way of 
emptying the trash seems a bit misguided. 

Perhaps an application like this *should* invoke the Finder, openly and even 
brazenly (Now asking the Finder to empty the Trash for you, so that you can 
follow along and see that no puppies are harmed in the process...) in the hope 
of gently re-training the user to, you know, get into the habit of emptying the 
trash without assistance.

And now, back to our regularly scheduled flame wars ...


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Re: How to empty the Trash programmatically?

2010-04-16 Thread Uli Kusterer

On 16.04.10 11:29, Matt Gough wrote:

To be fair though, if it is a user-initiated emptying and it is done via 
Finder, then I think it is fine to initiate a Trash emptying from another app. 
What isn't fine is for it to be done behind the user's back.


As long as it is obvious that this empties the system-wide trash. After 
all, Mail.app and other programs have their own trashes, and you 
wouldn't want a user to think they're emptying a local trash and 
suddenly delete a file they meant to recover.


-- Uli
http://www.zathras.de

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Re: How to empty the Trash programmatically?

2010-04-16 Thread Paul Sanders
 As long as it is obvious that this empties the system-wide trash. After
 all, Mail.app and other programs have their own trashes, and you
 wouldn't want a user to think they're emptying a local trash and
 suddenly delete a file they meant to recover.

In case it wasn't obvious, my earlier rm -rf post was intended 
to show how to empty the trash for a particular volume only.  I 
believe that might be what the OP was looking for.

Paul Sanders.
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Re: How to empty the Trash programmatically?

2010-04-16 Thread Graham Cox

On 17/04/2010, at 4:41 AM, Quincey Morris wrote:

 We keep shooting ourselves in the foot on this list by not first asking 
 enough questions.


Why should we though? If a poster can't muster the effort to sketch an outline 
of why they want to do a certain thing, it falls into the category of not 
asking a smart question in the first place. I'm happy to answer questions where 
I can but playing a game of 20 questions to fill in all the blanks that should 
have been there in the original post is something I just don't have time for.

If the original post lacks context, then the context applied by default is a 
standard app that has to live with everything else on a system where the user 
is in charge. If the question was about writing a Finder replacement (where 
certain privileges would be elevated) then it should have said so.

In the default context, I don't believe what I said was a preachy, know-it-all 
rant, and certainly wasn't intended that way. You don't have to read this list 
for very long to see just how much baggage people bring from other platforms. 
24 years of Mac programming experience (and making similar mistakes as well) 
must be worth something, surely?

--Graham


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