Unzipping archive from Ruby (Mac and Windows)

tt_su

Yes, I noticed there is a Zip module that seems to ship in Ruby 2.0 in the standard Sketchup installation.

I did not find the documentation however, but this could be the answer, at least for SU2014 and SU2015.

Fredo

It doesn't support ZIP files, it for general compression and GZ files.

driven

cheers for the explanation...

as I follow up to your last reply, this works on mac...

      def is_texture(file)
          result = false
          Zip;;InputStream;;open(file) {|io|
            while (entry = io.get_next_entry)
              result = true if entry.to_s.include? "ref\/"
            end
          result
          }
      end

could you test on Win with a skm path as file...
john
EDIT: added result = false although it is working...

fredo6

@driven said:

301 Moved Permanently

(ruby-doc.org)

This is ZLib. Is the Zip module just a wrapper of it?

Fredo

Dan Rathbun

@driven said:

could you test on Win with a skm path as file...
john

John the following is what I will have used in my SKM Import Library:
(Yes it works on Windows and should also on Mac.)

<span class="syntaxdefault">  def skm_has_texture</span><span class="syntaxkeyword">?(</span><span class="syntaxdefault">file_path</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    </span><span class="syntaxcomment"># validate file_path here<br /></span><span class="syntaxdefault">    bool </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> nil<br />    Zip</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">File</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">open</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">file_path</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> do </span><span class="syntaxkeyword">|</span><span class="syntaxdefault">skm</span><span class="syntaxkeyword">|<br /></span><span class="syntaxdefault">      tag </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> skm</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">read</span><span class="syntaxkeyword">(</span><span class="syntaxstring">'document.xml'</span><span class="syntaxkeyword">).</span><span class="syntaxdefault">slice</span><span class="syntaxkeyword">(/<</span><span class="syntaxdefault">mat</span><span class="syntaxkeyword">;</span><span class="syntaxdefault">material</span><span class="syntaxkeyword">\</span><span class="syntaxdefault">s</span><span class="syntaxkeyword">(.*)(\</span><span class="syntaxdefault">s</span><span class="syntaxkeyword">*>|\</span><span class="syntaxdefault">s</span><span class="syntaxkeyword">*\/>)/)<br /></span><span class="syntaxdefault">      unless tag</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">nil</span><span class="syntaxkeyword">?<br /></span><span class="syntaxdefault">        bool </span><span class="syntaxkeyword">=(</span><span class="syntaxdefault"> tag </span><span class="syntaxkeyword">!~</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">/(</span><span class="syntaxdefault">hasTexture</span><span class="syntaxkeyword">=\</span><span class="syntaxstring">"0\")/ rescue false )<br />      else<br />        puts("</span><span class="syntaxdefault">XML Read Error</span><span class="syntaxkeyword">;</span><span class="syntaxdefault"> Could not extract </span><span class="syntaxkeyword">\</span><span class="syntaxstring">"mat;material\" element.>"</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">      end<br />    end </span><span class="syntaxcomment"># open skmfile<br /></span><span class="syntaxdefault">    </span><span class="syntaxcomment">#<br /></span><span class="syntaxdefault">  rescue </span><span class="syntaxkeyword">=></span><span class="syntaxdefault"> e<br />    puts</span><span class="syntaxkeyword">(</span><span class="syntaxstring">"Error; #<#{e.class.name}; #{e.message}.>"</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">    return nil<br />  else<br />    return bool<br />  end </span><span class="syntaxcomment"># skm_has_texture?()<br />&nbsp;</span><span class="syntaxdefault"></span>

driven

@dan
yes, that works on mac,
I'm want to test if reading the stream works as it is meant to be the closest to unzip -t...
avoiding reading the file is said to be more efficient...

does my example even run on your PC?
john

Dan Rathbun

I had not tried it yet.

IMHO, your current code iterates all of the entries, and I think the test weak on the existence of the "ref" sub-directory. I decided myself not to rely upon that.

Reading a small text (xml) file should be relatively fast. It is not like this will be done thousands of times in a modeling operation. The only delays I notice are the output of console debug information.

driven

@dan rathbun said:

It is not like this will be done thousands of times in a modeling operation.

I'm using it to add icons to batches of skm's, possibly hundreds at a time...
I want a quick check before unzipping, as I need to use different file for color v material...
john

Dan Rathbun

This works on Windows:

<span class="syntaxdefault">def is_texture</span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> file</span><span class="syntaxkeyword">=</span><span class="syntaxdefault">UI</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">openpanel</span><span class="syntaxkeyword">()</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  result </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> false<br />  Zip</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">InputStream</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">open</span><span class="syntaxkeyword">(</span><span class="syntaxdefault">file</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">{|</span><span class="syntaxdefault">io</span><span class="syntaxkeyword">|<br /></span><span class="syntaxdefault">    while </span><span class="syntaxkeyword">(</span><span class="syntaxdefault">entry </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> io</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">get_next_entry</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">      if entry</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">to_s</span><span class="syntaxkeyword">.include?</span><span class="syntaxdefault"> </span><span class="syntaxstring">"ref\/"<br /></span><span class="syntaxdefault">        result </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> true<br />        break<br />      end<br />    end<br />  </span><span class="syntaxkeyword">}<br /></span><span class="syntaxdefault">  puts </span><span class="syntaxstring">"\"#{file}\"\n  is_texture; #{result.inspect}"</span><span class="syntaxdefault"> </span><span class="syntaxcomment"># debug<br /></span><span class="syntaxdefault">  return result<br />end<br /></span>

Just added a break inside the while loop, and moved the return result outside the block (because the block always returns the io object accd'g to the docs.)

Set the default arg to UI.openpanel() just so I could pick SKMs for test.

eneroth3

@tt_su said:

@eneroth3 said:

Thanks! The gem rubyzip gem does exactly what I wanted .

However I don't know what's the best practice to use a gem. Should I ask the user to install it or should I check if it exists when the plugin loads and otherwise install it? Should I in that case use statusbar texts to tell the user the gem is being installed and that it may take some time?

What I've done is wrap the require in a begin/rescue that catch LoadErrors (you don't want to catch other errors) and then use Gem.install to install it if it's missing.

What do you think is the best implementation? What about showing a web dialog or UI.messagebox when the plugin loads and the gem isn't installed telling the user that the gem is required? The user can choose to do it later (next time plugin is loaded) and the extension wont load or choose to download it now and there's a message saying it may take some time. The user would also be informed that this only has to be done once (per user and computer). Of course the extension warehouse info page would say that the extension will ask the user to install the gem and then automatically do it.

driven

that's similar to how TT handles his Lib requirement...

pop up a webdialog for a yes/no, then switch it to your instructions manual...
that they can read then while they wait...

and have no excuse for not reading them...
john

tt_su

@eneroth3 said:

What do you think is the best implementation? What about showing a web dialog or UI.messagebox when the plugin loads and the gem isn't installed telling the user that the gem is required? The user can choose to do it later (next time plugin is loaded) and the extension wont load or choose to download it now and there's a message saying it may take some time. The user would also be informed that this only has to be done once (per user and computer). Of course the extension warehouse info page would say that the extension will ask the user to install the gem and then automatically do it.

There is no need for user interaction. You simply call Gem.install("nameOfGem") and it's done automatically for you. Look at the Gem module in the StdLib: http://ruby-doc.org/stdlib-2.0.0/libdoc/rubygems/rdoc/Gem.html

However, you might want to call that only right before you need to use the gem - otherwise, if you call that in the head of the RB file with all the other require's it'll lock up SketchUp until the gem has been downloaded and installed. Not a big deal perhaps in the normal cases - but imagine if a user copied a few extensions that did this, then there's be a potential large lag during startup. But only once.