Unzipping archive from Ruby (Mac and Windows)

eneroth3

These examples use rubyzip but from a subdirectory rather than a Gem. Is it possible to only use the Zlib without rubyzip to put multiple files in the same zip archive?

I use these archives to store information for what can be drawn with my plugin. In my previous plugin I stored railroad tracks in a similar way but in their own folders instead of archives. Each folder contained a few .skp models for things to draw when drawing the track, e.g profiles, a preview image for web dialogs and a text file containing some information dynamically displayed in the web dialogs without loading the models and littering the definition list.

In this project I want to store all that data in one single file to make it easier for users to exchange them. I've already managed to do that but I don't know what's considered best practice, installing a Gem or copy the code into my own plugin's folder.

driven

have you tried this...

system( 'ROBOCOPY', files_directory, new_zip_folder_path )

if it works [I don't have a PC to test], The mac version is almost the same...

system('zip', '-r', new_zip_folder_path,  files_directory)

john

TIG

Your MAC ' zip' example is much like I use on older SketchUp version MACs with no Ruby zip built-in [with -q ?].

Your ' ROBOCOPY' examples just makes a copy of the files in the source-folder in a new folder named ' xxxx.zip' - not zipped ! and it flashes up a black cmd window - just like in any WIN system call.

On PCs you can make a longer set of strings that are VB commands. and put them into a ' xxxx.vbs' file which then runs silently using UI.openURL("file:///#{path_to_vbs_file}"), and it will make a proper ZIP file... I use that in older SketchUp version PCs with no Ruby zip built-in.

txt="Const FOF_CREATEPROGRESSDLG = &H0&
Const MyZip = \"#{zip.tr("/","\\")}\"
Const File1 = \"#{tskp1.tr("/","\\")}\"
Const File2 = \"#{tskp2.tr("/","\\")}\"
'Create the basis of new zip file
CreateObject(\"Scripting.FileSystemObject\").CreateTextFile(MyZip, True).Write \"PK\" & Chr(5) & Chr(6) & String(18, vbNullChar)
'get ready to add files to zip
With CreateObject(\"Shell.Application\")
'add files
.NameSpace(MyZip).CopyHere File1, FOF_CREATEPROGRESSDLG
wScript.Sleep 200
.NameSpace(MyZip).CopyHere File2
End With
' wait 3 secs, to let it finish...
wScript.Sleep 3000
'''

Where ' zip' is the path to the new ZIP file, and ' tskp1' etc paths to SKP files - the tr makes / into \ for VBS use
You can get it to write a temp txt file at the end so you know it's done...

fredo6

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

driven

301 Moved Permanently

(ruby-doc.org)

tt_su

@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.

tt_su

@fredo6 said:

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.