Instructor content

bentleykfrog

Initial testing on the mac works too, though there's no need to copy the instructor files to the temp directory on a mac

Dan Rathbun

@thomthom said:

grrr.... the PHP formatter broke the code!

Good catch!

We best be careful from now on using the [ code = php ] bbtag.

Dan Rathbun

@chris fullmer said:

Sorry Dan, you lost me at "APPDATA". I never knew there was an alternate folder schema somewhere. I'm really not sure what appdata is.

It's a path where applications keep user specific data files.

And there are two (2) AppData paths (on PC at least.)
One is "Local" AppData, that is used only on that specific computer.
The other is "Roaming" AppData, which is used for a specific user, no matter what workstation they log onto within a given network.

It looks like Sketchup does not use the Local AppData path at all (although GoogleEarth and GoogleUpdater do.)

Also.. if you have your system set to "hide system folders" you may not see either of the AppData folders at all. (They are defined as "hidden system" folders on XP.)

To see what the paths are, open a cmd shell, and type set to view all the Environment variables.
check the values for:
APPDATA
LOCALAPPDATA

To make the situation a bit more confusing.. there is also a generic APPDATA path for All Users on a PC computer, kept under the "All Users" profile. This is the profile that is normally considered to be the "Shared" profile. It's where the "Shared Documents", "Shared Music", "Shared Pictures" etc. are kept. (And also where the SU Pro license file is kept.)
So normally we would think it better to keep "Shared Plugins" under the "All Users" profile, instead of beneath the Program Files application folder. (In the past, there was not much difference, but on Windows versions 6+, there is a security hiccup when trying to use a Plugins folder beneath the Program Files path. It may be easier, if Google changes the Sketchup PC edition, to use the "All Users" profile for the "Shared Plugins" and "Shared Tools".)

Dan Rathbun

@bentleykfrog said:

@bentleykfrog said:

Its a long way around but I'm thinking that it would be possible to write the required files and folders to the /temp/ folder on the C:/ drive before the tool loads, ...

.... So far, it works quite well. I'm just rolling over testing on the mac and will update this if there needs to be changes.

First of all. ALWAYS copying files to the TEMP folder seems like extra work that may never be needed, if the user does not have the instructor toolwindow open. (Note that the SUAPI is lacking a UI.inspector_visible?() method, which we could write for PC, IF we know the window names for all language builds.)

Also.. there is no reason why the tool's getInstructorContentDirectory() callback could not be the 'trigger' that copies the files to TEMP, rather than doing it everytime. This is something to think about for the future.
(Issue) Does Sketchup always call the getInstructorContentDirectory() callback regardless of whether the Instructor window is open or closed?

Playing 'devil's advocate', let's say we get Google to provide a cross-platform, locale independant query method to return visibilty state for inspector window, likely named: UI.inspector_visible?('*caption*') (where caption is one of the strings returned by the existing UI.inspector_names() method.)
Then the getInstructorContentDirectory() callback would look like:


class MyTool

  def getInstructorContentDirectory() # callback
    if UI.inspector_visible?('Instructor')
      temp =( MAC ? "#{ENV['TMPDIR']}" ; "#{ENV['TEMP']}" )
      return copy_help_files( temp, @tool_help_subdir ) unless @help_files_copied
    else
      return ""
    end
  end

  def copy_help_files( temp, tool_help_subdir )

    # call Niall's library method here
    # passing args  temp and tool_help_subdir 
    # Niall's method should return path to temp folder
    # with the "path to root" prepended and the
    # tool_help_subdir appeneded
    
    @help_files_copied = true

  end

  def deactivate()
    @help_files_copied = false
    # other code here
  end

  def suspend()
    @help_files_copied = false
    # other code here
  end

end # class

This is just an idea, but actually Niall it would be better if your code was implemented as a Mixin Module (not a class,) and then people who need it actually "mix" it into their Tool class using include() (That likely means you need to rename the initialize method, as Tool coders often need to use that method to init their tool instance. how about help_setup() instead, and authors can insert a call to help_setup() within their initialize() method.)
This way all your methods become private methods of the Tool class instance.
Wrap your code in module Mixin::LoadInstructorContent then to mix it in:

class MyTool

  require('Mixin/load_instructor.rb')
  include( Mixin;;LoadInstructorContent )

  # now all Niall's methods are instance methods
  # of THIS specific tool class 'MyTool'
  # a coder need only insert the help_setup() call;
  def initialize()
    help_setup()
    # other tool instance init code
  end

end #class

SO.. and this is important your Mixin module, can actually define the getInstructorContentDirectory() callback method for the tool author, so he/she does not need to do it.

Chris Fullmer

@dan rathbun said:

(Issue) Does Sketchup always call the getInstructorContentDirectory() callback regardless of whether the Instructor window is open or closed?

I'm pretty sure it does not. If you put a UI.messagebox into the getInstructorContentDirectory() callback method, it does not pop up unless the instructor is actually open.

Dan Rathbun

@chris fullmer said:

@dan rathbun said:

(Issue) Does Sketchup always call the getInstructorContentDirectory() callback regardless of whether the Instructor window is open or closed?

I'm pretty sure it does not. If you put a UI.messagebox into the getInstructorContentDirectory() callback method, it does not pop up unless the instructor is actually open.

Well cool! That in and of itself can be a test, and perhaps a means of defining a query method via an empty tool. More testing required.

Dan Rathbun

@Niall

This is safer:
temp =( MAC ? "#{ENV['TMPDIR']}" : "#{ENV['TEMP']}" )

as there is more than one compiler for the PC, not just 'mswin' (there is also 'mingw')

So test for 'darwin' instead.

For the global constants:

<span class="syntaxdefault">  unless defined</span><span class="syntaxkeyword">?(</span><span class="syntaxdefault">Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">MAC</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> <br />    Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">MAC </span><span class="syntaxkeyword">=(</span><span class="syntaxdefault"> Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">RUBY_PLATFORM </span><span class="syntaxkeyword">=~</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">/</span><span class="syntaxdefault">darwin</span><span class="syntaxkeyword">/</span><span class="syntaxdefault">i </span><span class="syntaxkeyword">?</span><span class="syntaxdefault"> true </span><span class="syntaxkeyword">;</span><span class="syntaxdefault"> false </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  end<br />  unless defined</span><span class="syntaxkeyword">?(</span><span class="syntaxdefault">Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">WIN</span><span class="syntaxkeyword">)</span><span class="syntaxdefault"> <br />    Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">WIN </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> </span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> not Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">MAC </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  end<br />  Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">OSX </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">MAC unless defined</span><span class="syntaxkeyword">?(</span><span class="syntaxdefault">Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">OSX</span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">  Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">PC  </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">WIN unless defined</span><span class="syntaxkeyword">?(</span><span class="syntaxdefault">Object</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">PC</span><span class="syntaxkeyword">)</span><span class="syntaxdefault">  </span>

Now they can be accessed by their simple names, ie MAC or WIN, etc.

Note that using the old deprecated PLATFORM constant directly may cause problems in future Ruby versions, when they stop defining it. Use RUBY_PLATFORM instead.

Note there may still be a poor example on the Sketchup FAQ webpage, that suggests users set a constant, and this example uses the identifier PLATFORM, which may break your code.
see question: How can I detect if my plugin is running on the Mac vs. PC?
on: Google SketchUp Ruby API FAQs
(I entered a 'doc bug report', and suggested the code snippet above be added to the sketchup.rb file instead.)

Dan Rathbun

Here's another way to get around the drive letters on PC

On my machine I have logical drives (XP SYSTEM), E:(DATA) and F:(TEMP)
My machine is named 'JEDI'

Environment vars:
ENV['COMPUTERNAME'] = 'JEDI'
ENV['LOGONSERVER'] = '\JEDI'

I went to drive F:, and made a dir 'Shared', went into that dir, and made a subdir 'Plugins'
Then I right-clicked that 'Plugins' subdir, and chose "Sharing and Security..." from the context menu.
Under "Network sharing and security" I checked the box "Share this folder on the network"
In the Sharename textbox I typed 'NetPlugins'...
.. below that I checked the box "Allow network users to change my files" *
(*If you don't at least temporarily, you can't copy files into that folder.)
and clicked the 'OK' button.

The folder: 'F:\Shared\Plugins'
is now shared as: '\JEDI\NetPlugins'

or generically as the Ruby string:
"#{File.expand_path(ENV['LOGONSERVER'])}/NetPlugins"

I copied a 'TestScript.rb' to the shared folder, and tested it at the console:
load "#{ENV['LOGONSERVER']}/NetPlugins/TestScript.rb"
.. no problem it loaded the file.

I tested: File.expand_path("#{ENV['LOGONSERVER']}/NetPlugins/TestScript.rb")

//JEDI/NetPlugins/TestScript.rb
.. so expanding the path will not break code by reverting to a drive letter prepended absolute path.

Next I made a little file called 'zz.rb' (so it would load after all other plugins,) and put it in the normal Program Files Plugins folder. It has 2 lines:

server = ENV['LOGONSERVER'].gsub(/\\/,'/')
require_all("#{server}/NetPlugins")

server = File.expand_path(ENV['LOGONSERVER']) also works, if you dont like gsub.

.. I then started Sketchup 8, and bingo! the TestScript.rb file loaded. Here's the test script:

puts "I am a test script loaded from #{File.expand_path(ENV['LOGONSERVER'])},\n and my path is; #{__FILE__}\n"

Dan Rathbun

We need to think about two plugin install locations:

COMMOM_PLUGINS and USER_PLUGINS

Both platforms:
COMMOM_PLUGINS = Sketchup.find_support_file('Plugins')

Mac:
[normal case]
USER_PLUGINS = "/Users/#{ENV['USER']}" + COMMOM_PLUGINS
[if the user sets a custom HOME folder]
USER_PLUGINS = "#{ENV['HOME']}" + COMMOM_PLUGINS

PC:
VER = Sketchup.version.to_i USER_PLUGINS = File.expand_path(ENV['APPDATA']+'\Google\Google SketchUp '+VER+'\SketchUp\Plugins')

Note that on Mac, the loading of scripts in the user plugins (on Sketchup startup,) is automatic.
Not so on PC. A user must create the appdata dir, AND use the require_all() method from the sketchup.rb file to autoload scripts from the appdata path. The require_all() method will also push the appdata path onto the $LOAD_PATH array, so that subsequently, normal require() or load() can find rubies beneath that path.
%APPDATA%
On XP the appdata path is: "C:/Documents and Settings/#{ENV['USERNAME']/Application Data/" ...
On Windows 6.0+, it's "C:/Users/#{ENV['USERNAME']/AppData/Roaming" ...

IN ADDITION, some people, myself included, wish to maintain a common cross version plugins folder that the Google installers will not touch. Some will wish to have this on another drive (one person here at SCF, said he uses a "thumbdrive", so he can take his plugins from machine to machine easily.)
Others may wish to create a folder under the appdata path, like:
USER_PLUGINS_ALL = File.expand_path(ENV['APPDATA']+'\Google\Google SketchUp All\Plugins')
And as TIG said, others may wish to use a network drive.

Pout

tried this to before
after some testing i just created a tutorial in a webdialog

bentleykfrog

@dan rathbun said:

...I tested: File.expand_path("#{ENV['LOGONSERVER']}/NetPlugins/TestScript.rb")

//JEDI/NetPlugins/TestScript.rb
.. so expanding the path will not break code by reverting to a drive letter prepended absolute path...

Nice find Dan, and this should (hopefully:untested:willcheck) work with the temp copy script, as it compares the array[0] of somepath.split("/") with the same of the temp directory to start the copy to the temp folder. So on pc this would be like comparing 'C:' with '' (before this there's a short-circuit for mac). Only question now is can sketchup run from a '\Server' path?? as this would ruin the comparison.

bentleykfrog

@bentleykfrog said:

Only question now is can sketchup run from a '\Server' path?? as this would ruin the comparison.

Actually that should read "can the default temp folder run from a '\Server' path?? as this would ruin the comparison"

bentleykfrog

@chris fullmer said:

@dan rathbun said:

(Issue) Does Sketchup always call the getInstructorContentDirectory() callback regardless of whether the Instructor window is open or closed?

I'm pretty sure it does not. If you put a UI.messagebox into the getInstructorContentDirectory() callback method, it does not pop up unless the instructor is actually open.

I get the same results on mac. Also, I notice that it calls getInstructorContentDirectory() onMouseOver and onMouseOut of the instructor dialog. Not sure if its a webkit quirk or if its intended, will check on pc.

bentleykfrog

I've updated Dan's edit of the load_instructor script to address some issues:

script now contains getInstructorContentDirectory method as per Dan's suggestion
script methods converted from camelCase
added prefix 'lins_' to each method to reduce chance of method name conflicts
removed returns when not needed
made the temp directory creation more consistent
modified the precedence of mac over temp file setting
added private method calls to relative_instructor_path & temp_instructor_folder methods
added plugin folder name attribute to lins_setup() to resolve FILE issue when load_instructor.rb installed into [any $LOAD_PATH]/mixin/load_instructor.rb and default values of instructor folder and temp folder used
added $LOAD_PATH check for plugins instructor folder if no instructor_folder attribute is set to lins_setup
since we're specifying a folder name even on default, unique temp folder name creation was removed

Read the definition of use in the code to get a better understanding of how to use Load Instructor.

Issues I'm unsure of:

I removed the @@tool_filepath setting as I'm not sure what to do with it. If the scripts are intended to be truly portable, then how does an .rbs file require() other files? ThomThom's vertex tools method suggests that their code will already have a variable showing the scripts location, with which you could set the instructor folder location from, and use the location folder attribute of lins_setup().
Sketchup loaded from a server location? (ie. portable versions of Sketchup?)
Attaching an AppObserver for onQuit to delete the temp file? (I wouldn't have a clue about this: I'm concerned that it might overwrite other plugins' onQuit method, and I'm guessing that onQuit won't be called when there's a bugsplat, so maybe its better to have consistent temp folder directories as in this update? and rely on the system/users preference for temp folder clearing?)

Thanks to Dan for all the tips/advice/&code, you've been more than helpful.

Load Instructor [Updated 13-03-2011:7.12am]

bentleykfrog

@bentleykfrog said:

Its a long way around but I'm thinking that it would be possible to write the required files and folders to the /temp/ folder on the C:/ drive before the tool loads, then use a relative path to the /temp/instructor/ directory in getInstructorContentDirectory. This would avoid the volume traversal problem but I think it would be a bit of a headache.

Script Updated on 2011-03-13: See http://forums.sketchucation.com/viewtopic.php?f=180&t=31060&p=315364#p315364

Here's a very long post and a very-rough draft of the Instructor-copy-to-temp-folder script. I've tested this on Windows 7 with Sketchup 8 and I used [url=http://forums.sketchucation.com/viewtopic.php?t=17660:2t71i41l]Alex's Plugin Loader[/url:2t71i41l] for testing on other drives. So far, it works quite well. I'm just rolling over testing on the mac and will update this if there needs to be changes.

I'm not sure about alot of things, to say the least;

file chmod permissions on close? (ie. Security, should we go for a File.chmod(0644, temp_abs_path+entry) before close?)
file encoding copy? I'm using the texture writer to supplement the simplicity of my File.write code but I'm thinking that if encoding is preserved the script might not have the issue of corrupt images on copy (can we use require "fileutils", I've got no experience with ruby extensions)
block devices and character devices? (this flies way over my head)
And add more to that 'fifo', 'link', 'socket'
File.executable? checks? (probably not needed as sketchup loads the plugin script unless the plugin and instructor content are in completely foreign folders (thomthom?))
Temp directory clearing? is this necessary on tool close or would it be better to store a default with the script and maintain the files on exit, and check if the files exist and are consistent on next load? (probably better to clear and load for each sketchup session?)
Not sure about flash/movie/audio/etc.. files, (my target.write code doesn't like anything more complex than a text file, there's probably some encoding settings that I'm missing out on as in my first point that is corrupting the file on write. If fileutils is not possible then maybe encoding settings might solve this)
How about server locations on windows like "\someserver" instead of "C:\"

Also, please forgive the amateur coding, its my first try at something that is cut-and-paste portable. But I'm open for critique/suggestions for improvement (though its a little off topic, best to PM)

# ##-------------------------##
# ##----DEFINITION OF USE----##
# ##-------------------------##
# #first add the load instructor to your module
# #or whatever module you'd like to add it to
# #in this example, I've added it to MyModule

# #calling the load instructor
# #specifying no attributes should return the base temp and 
# #construct a instructor path by; [ruby_script_name]/instructor
# instructor_copy = MyModule;;LoadInstructor.new
# #after calling the load instructor, you can set the
# #instructor_folder & temp_folder if you need to adjust
# #the default values
# instructor_copy.instructor_folder = [custom instructor folder]
# instructor_copy.temp_folder = [custom temp folder]
# #or you can call the load instructor with custom directories like this
# temp_folder = ([PLATFORM].grep(/mswin/)==[PLATFORM]) ? ENV["TEMP"] ; ENV["TMPDIR"]
# instructor_folder = File.join(File.join(File.basename( __FILE__ ),"floating_camera"), "instructor")
# instructor_copy = MyModule;;LoadInstructor.new( instructor_folder , temp_folder )
# #we need to copy the files to the temp directory
# #if needed by this method
# instructor_copy.copyInstructor
# #any errors in the copy will be reported to the ruby console

# #after this has completed, you can return the instructor temp 
# #folder path (relative to the temp folder) by;
# instructor_temp_folder = instructor_copy.returnTempInstructorFolderName
# #this will be helpful if you're storing the instructor temp 
# #folder location in a class variable to check if you need 
# #to run the script per sketchup session (returns false if 
# #no temp folder created)

# #finally, you can get the relative path from the sketchup 
# #tools folder to the instructor folder (whether it was 
# #copied to the temp folder or not) by calling
# @@relative_instructor_folder = instructor_copy.returnRelativePath

# #as an example, you can put these calls inside your tools 
# #initialize method, like the example below. Initialize 
# #will be called before getInstructorContentDirectory
# def initialize
	# instructor = CControl;;LoadInstructor.new
	# instructor.copyInstructor
	# @@relative_instructor_path = instructor.returnRelativePath
# end #def

# #and then add this def to your tool to give sketchup the
# #relative path
# def getInstructorContentDirectory
	# return @@relative_instructor_path
# end #def

# #now you should have a consistent Instructor Directory
# #across drives

	#need to check if paths are relative or absolute
	class LoadInstructor
		attr_accessor ;instructor_folder, ;temp_folder
		def initialize(instructor_folder=false, temp_folder=false)
			if instructor_folder
				@instructor_folder = instructor_folder
			else
				@instructor_folder = self.getDefaultInstructorFolder
			end
			if temp_folder
				@temp_folder = temp_folder
			elsif [PLATFORM].grep(/mswin/)!=[PLATFORM]
				@temp_folder = @instructor_folder
			else
				@temp_folder = self.getDefaultTempFolder
			end
		end #def
		
		def getDefaultInstructorFolder
			dir = File.expand_path(File.dirname( __FILE__ ))
			file_ext = File.extname( __FILE__)
			file_basename = File.basename( __FILE__ , file_ext)
			dir = dir + "/" + file_basename + "/instructor"
			return dir
		end #def
		
		def getDefaultTempFolder
			temp_folder = File.expand_path(ENV["TEMP"])
			return temp_folder
		end #def
		
		# adapted from http://boonedocks.net/mike/archives/162-Determining-Image-File-Types-in-Ruby.html
		# checks for jpg,png,tif,tga & bmp and variations in their data formats
		def getImageType(file)
		
			filestart = IO.read(file,30)
			case filestart
				when /^BM/
					#puts "BMP; "+file
					return 'bmp'
				when /^GIF8/
					#puts "GIF; "+file
					return 'gif'
				when /^MM\x00\*(\x00){3}/
					#when /^MM.\*.{3}/
					#puts "TIF MAC; "+file
					return 'tif'
				when /^II\*\x00\x08(\x00){3}\x15/
					#when /^II\*./
					#puts "TIF PC; "+file
					return 'tif'
				when /^\x89PNG/
					#puts "PNG; "+file
					return 'png'
				when /^\xff\xd8\xff\xe0\x00\x10JFIF/
					#puts "JPG; "+file
					return 'jpg'
				when /^\xff\xd8\xff\xe0/
					#puts "JPG; "+file
					return 'jpg'
				when /^\xff\xd8\xff\xe1(.*){2}Exif/
					#puts "JPG; "+file
					return 'jpg'
				when /^\x00\x00\x0A\x00/
					#puts "TGA Compressed; "+file
					return 'tga'
				when /^\x00\x00\x02\x00/
					#puts "TGA; "+file
					return 'tga'
				else
					#check for tga files by extension
					fileext = File.extname(file)
					case fileext
						when /^\.(?i)(tga|vda|icb|vst)/
							#puts "TGA by extension; "+file
							return 'tga'
						when /^\.(?i)(tif|tiff)/
							#puts "TIF by extension; "+file
							return 'tif'
					end #case
					puts "unknown; "+IO.read(file,20).dump
					return 'unknown'
			end
		end
		
		def checkValidity(filename)
			filetype = File.ftype(filename) #grabs the file type; 'file','directory','characterSpecial','blockSpecial',
																			#'fifo','link','socket','unknown'
			case filetype
				when "file"
					if (!File.readable?(filename))
						puts "file is not readable; "+filename
						return "unreadable"
					end #if
					if (!File.size?(filename))
						puts "file exists but has 0 size; "+filename
						return "invalidsize"
					end #if
					image_type = self.getImageType(filename)
					if(image_type == 'unknown')
						puts "file exists but is unknown (assume text file); "+filename
						return "unknowntype"
					end #if
					#puts "found image file; "+filename
					return "imgfile"
				when "directory"
					#puts "found directory; "+filename
					return "directory"
			end #case
		end #def
		
		#call like self.copyInstructorFiles([base_dir_of_instructor_folder],[base_dir_of_instructor_folder])
		#dir changes on recursion through the child directories and basedir stays constant to
		#maintain the folder/file structure in the temp folder
		def copyInstructorFiles(temp_folder, dir, basedir)
			entries = Dir.entries(dir)
			if (dir != basedir)
				temp_path = dir.dup
				temp_path.slice!(basedir)
				temp_folder_abs_path = temp_folder+temp_path
				Dir.delete(temp_folder_abs_path) if(File.exists?(temp_folder_abs_path))
				Dir.mkdir(temp_folder_abs_path, 0700)
			else
				temp_folder_abs_path = temp_folder
			end #if
			entries.delete(".")
			entries.delete("..")
			
			#create a group and a texture writer object for copying imgfiles
			entries.each {|entry|
				entry_absolute_path = File.join(dir, entry)
				file_validity = self.checkValidity(entry_absolute_path)
				case file_validity
					when "directory"
						#recurse through the child directories and copy the files
						self.copyInstructorFiles(temp_folder,entry_absolute_path,basedir)
					when "imgfile"
						grp = Sketchup.active_model.entities.add_group
						tw  = Sketchup.create_texture_writer
						#so create a material name
						filename = File.basename(entry_absolute_path)
						fileext  = File.extname(filename)
						filebase = File.basename(entry_absolute_path, fileext)
						matname = "instructor_"+filebase + rand(1000).to_s
						
						#load the image into a material
						mat = Sketchup.active_model.materials.add(matname)
						mat.texture = entry_absolute_path
						mat.texture.size = [mat.texture.image_height,mat.texture.image_width]
						
						#apply the material to a group and export to temp directory
						grp.material = mat
						tw.load(grp)
						result = tw.write(grp, File.join(temp_folder_abs_path,entry))
						
						case result
							when 0
								#puts "file written; "+temp_folder_abs_path+"/"+filename
							when 1; puts "file failed (invalid tiff); "+temp_folder_abs_path+"/"+filename
							when 2; puts "file failed (unknown); "+temp_folder_abs_path+"/"+filename
						end #case
						
						#delete the material
						grp.material = nil
						Sketchup.active_model.materials.remove mat
						grp.erase! if grp.valid?
					when "unknowntype"
						source = File.open(entry_absolute_path)
						target = File.open(File.join(temp_folder_abs_path,entry), "w")
						
						target.write( source.read(64) ) while not source.eof?
						
						source.close
						target.close
				end #case
			}
		end #def
		
		def copyInstructor
			@instructor_folder = File.expand_path(@instructor_folder)
			@temp_folder       = File.expand_path(@temp_folder)		
			#on mac there's no need to copy, just to generate a correct relative path
			#as other volumes can be accessed through the /volumes/ folder
			#so @instructor_folder == @temp_folder only on mac
			if @instructor_folder != @temp_folder
				#check if paths are on the same drive in windows, if they are
				#there's no need to copy as they can be accessed through relative paths
				instructor_path_array = @instructor_folder.split("/")
				temp_path_array = @temp_folder.split("/")
				if instructor_path_array[0] != temp_path_array[0]
					#check if the temp path is equal to ENV["TEMP"]
					#if so we need to generate a unique instructor folder id
					if @temp_folder == File.expand_path( ENV["TEMP"] )
						temp_instructor_folder = File.join(@temp_folder, "instructor-"+Time.now.to_f.round.to_s)
					elsif (temp_path_array[temp_path_length-1] != "instructor")
						temp_instructor_folder = File.join(@temp_folder, "instructor")
					else
						temp_instructor_folder = @temp_folder
					end #if
					Dir.delete(temp_instructor_folder) if(File.exists?(temp_instructor_folder))
					Dir.mkdir(temp_instructor_folder, 0700)
					self.copyInstructorFiles(temp_instructor_folder,@instructor_folder,@instructor_folder)
					@temp_folder = temp_instructor_folder
				else
					puts "on same drive"
				end
			else
				puts "on a mac"
			end #if
		end #def
		
		def returnTempInstructorFolderName
			#return the relative path from ENV["TEMP"] so user can store this
			#in a default and use it for consistency between plugins and sessions
			instructor_path_array = @instructor_folder.split("/")
			temp_path_array = @temp_folder.split("/")
			if (@instructor_folder != @temp_folder) && (instructor_path_array[0] != temp_path_array[0])
				temp_instructor_folder_name = @temp_folder.dup
				temp_instructor_folder_name.slice!(File.expand_path( ENV["TEMP"] ))
				return temp_instructor_folder_name[1,temp_instructor_folder_name.length]
			else
				return false
			end
		end #def
		
		def returnRelativePath
			tool_path = Sketchup.get_resource_path( 'helpcontent/tool' )
			temp_path = @temp_folder
			#need to reverse loop through tool path by the separator until
			#we get a match starting at the first line of the temp path
			relativity_index = 0
			common_directory_path = temp_path
			tool_path_array = File.expand_path(tool_path).split('/')
			0.upto(tool_path_array.length-1) {|i|
				common_directory = tool_path_array[0, tool_path_array.length - i]
				if [PLATFORM].grep(/mswin/)==[PLATFORM]
					common_directory_path = common_directory.join('/')
				else
					common_directory_path = '/'+common_directory.join('/')
				end
				if common_directory_path == temp_path[0,common_directory_path.length]
					break
				end
				relativity_index = relativity_index.next
			}
			
			temp_path = temp_path[common_directory_path.length,temp_path.length]
			path_to_common = "..#{File;;SEPARATOR}" * relativity_index
			relative_path = File.join( path_to_common, temp_path)
			return relative_path
		end #def
	
	end #class

Script Updated on 2011-03-13: See http://forums.sketchucation.com/viewtopic.php?f=180&t=31060&p=315364#p315364

Load Instructor [Updated 10-03-2011:3.20am]

Dan Rathbun

@bentleykfrog said:

Issues I'm unsure of:

I removed the @@tool_filepath setting as I'm not sure what to do with it. If the scripts are intended to be truly portable, then how does an .rbs file require() other files? ThomThom's vertex tools method suggests that their code will already have a variable showing the scripts location, with which you could set the instructor folder location from, and use the location folder attribute of lins_setup().

Well, he actually says constant. And this is true, because the SketchupExtension class load() (which uses Sketchup::require(),) cannot for some reason directly load rbs files. So we must use a non-scrambled loader script to in turn load the rbs. I do the same thing ThomThom does.. however, there is no way to know what the author will choose to name his file path constant. Nor.. should a library (or mixin,) module force an author to use any specific name. Therefor.. an internal variable is needed, and I chose to make it a class variable, and named it @@tool_filepath. ThomThom and any other author, simply assigns @@tool_filepath to point to the constant name they defined in their loader script. Perhaps because my example showed a literal string assignment, you assumed that was necessary? It's not, for example ThomThom could declare in his Tool class:
@@tool_filepath = VertexToolsPath

The way I had it.. it would use __FILE__ as a default for non-scrambled files, and insist on a explicit assignment of the @@tool_filepath variable for rbs files.
By instead, adding the required argument script_folder to the lins_setup() method, you have also defeated the default initialize() method that is mixed in (it has no arguments in the lins_setup() call.)
I think it will work better for newbie's the previous way.

@bentleykfrog said:

Sketchup loaded from a server location? (ie. portable versions of Sketchup?)

In normal circumstances, this is a violation of the Sketchup "Terms of Use." After all cloud computing is one of Google's main business models. One website that did this was told to remove Sketchup from their servers.
Now if you were in a educational environment, and had permission from Google it may be different. But it's not that hard to keep client application installs up to date. The 'bear' is keeping all the Plugins for all those client workstations up to date. So really using a shared Plugins folder on a network drive is what most admins will want to do. And as I showed (above) it can easily be done by pussing a network path into the $LOAD_PATH array and using the require_all() method.
The tricky part comes in with TIG's case, where each student has their own personal "User Plugins" folder on a network drive. These personal folders cannot be shared with write access (because it would defeat the purpose of having secure user accounts.)
So everything should work fine for the student whilst they are working on a plugin... because they will have access to their own instructor content folders. When they finish and 'publish' the plugin for others to use, the plugin would get installed (by the teacher, or an IT person,) into the 'Network Shared Plugins' path, where all the students could have access to it and it's help content.

@bentleykfrog said:

Attaching an AppObserver for onQuit to delete the temp file? (I wouldn't have a clue about this: I'm concerned that it might overwrite other plugins' onQuit method, and I'm guessing that onQuit won't be called when there's a bugsplat, so maybe its better to have consistent temp folder directories as in this update? and rely on the system/users preference for temp folder clearing?)

True about the BugSplat! If you've done away with the temp names that have timecodes embedded, then the erase on first access method will work fine (in case the help content was updated after the last use.)
The onQuit() would not interfere as a special observer instance would have been used, BUT... because of their quirky nature, if you can avoid an observer, do so. ALSO I have been trying to use an AppObserver and it's onQuit() callback, (in another project,) only to discover that Sketchup does not wait for the callback to return. I'm trying to save settings and window locations.. but Sketchup is closing all it's owned and child windows, and it's own application window before any of the code in my callback can do it's job. Annoying!

@bentleykfrog said:

Thanks to Dan for all the tips/advice/&code, you've been more than helpful.

no problem.. glad I could help.

Dan Rathbun

A few more observations / issues:

File.exists? is deprecated.
Use the call File.exist? (singular) for future compatability.

The $LOAD_PATH members can be manipulated. Making an assumption about where the the first member points could cause problems. (Refering to the lins_get_default_instructor_folder() method.)

The lins_return_relative_path() method still references the deprecated PLATFORM constant, and assumes all PCs will running a MSVS compiled Ruby. The mingW compiled Ruby is becoming more popular and the Windows Ruby One-Click Installer uses only the mingW compiler now.
To test for Windows, Line 553 should be, either:
if( not RUBY_PLATFORM =~ /darwin/i )
or
if RUBY_PLATFORM =~ /(mswin|mingw)/i
The second has the advantage that, if in the future say a Sketchup Linux edition is released, you code will not break.

Instructions:
The inline instructions have grown to be very confusing for newbies.
I would suggest reverting to the simple default instructions, and add a note for advanced use see load_instructor_advanced.txt, and move all the advanced instructions into the separate text file.

And.. when this is all done (seeing as how you still have a beta version number,) and you decide on the first release, it would be best to create a new topic with a [ code ] prefix for version 1.0 (so Jim's indexer script can find it.) Then we will remove our beta version(s) this topic, and insert a link to the code release topic.

bentleykfrog

Dan, your advice is invaluable. There's still a couple of things I'm concerned about:

@dan rathbun said:

The way I had it.. it would use __FILE__ as a default for non-scrambled files, and insist on a explicit assignment of the @@tool_filepath variable for rbs files.
By instead, adding the required argument script_folder to the lins_setup() method, you have also defeated the default initialize() method that is mixed in (it has no arguments in the lins_setup() call.)
I think it will work better for newbie's the previous way.

The issue I had with the previous version was the way that load_instructor.rb constructed the default path to the /instructor/ folder. The previous version used __FILE__ from /mixin/load_instructor.rb and then navigated back to the folder that contained the /mixin/ folder. From that path it used /instructor/, so it meant that you would have issues if you had more than one ruby script using Load Instructor. So there needs to be a string attribute that identifies the name of the folder that contains /instructor/ to avoid this conflict between plugins. If the LoadInstructor mixin is going to be stored in a file that is separate from your script then calling __FILE__ will only be able to identify /load_instructor.rb and wont be able to identify the filename of the script that the LoadInstructor mixin was loaded into (unless there's a method for getting around this).

Regarding the @@tool_filepath issue, you should still be able to declare these paths in the second and third attributes of lins_setup()? like:

@@tool_filepath = VertexToolsPath

def initialize
  instructor_folder = File.join( @@tool_filepath ,'your_scripts_folder/instructor')
  temp_folder       = (RUBY_PLATFORM =~ /darwin/i) ? '' ; File.join(ENV["TEMP"], 'your_scripts_folder/instructor')
  lins_setup('',instructor_folder,temp_folder)
end

And if you're storing all the files beneath any of the load path's, you shouldn't need to worry about the second and third attributes, or @@tool_filepath for that matter, like:

def initialize
  lins_setup('your_scripts_folder')
end

@dan rathbun said:

The $LOAD_PATH members can be manipulated. Making an assumption about where the the first member points could cause problems. (Refering to the lins_get_default_instructor_folder() method.)

Hmmm, it should be best then if I threw an error if the /instructor/ folder can't be found, like (using your @@tool_filepath check):

def lins_get_default_instructor_folder(script_folder)
  instructor_folder = ''
  $LOAD_PATH.each {|load_path|
    check_path = File.join(load_path, script_folder, 'instructor')
    if check_path != '(eval)' && File.exist?(check_path)
      instructor_folder = File.join(load_path, script_folder, 'instructor')
      break
    end
  }
  if instructor_folder.empty?
    file_path = File.join(script_folder, 'instructor')
    raise(ScriptError,"#{self.class.name}; Instructor folder error. Could not find #{file_path} beneath any of the $LOAD_PATH's.")
  else
    return instructor_folder
  end #if
end #def

I've adopted all your other suggestions to the script, I just have to sort out the former issues before I'll produce the first release.

Dan Rathbun

Niall... I am sorry. I've got my head wrapped around another project, and I was not seeing the obvious here.

YOU cannot use __FILE__ at all, in your mixin code. Because it's a special Ruby keyword that gets evaluated when the mixin is parsed.

I was thinking wrongly that it's evaluation would be defered if it was used inside a method (the "setup" method.)

The tool author CAN use __FILE__ if his script is unscrambled, otherwise if he scrambles his tool code, he must use a rbs loader where he should set a constant (like ThomThom's example.)

The tool author only cares where YOUR code is when he uses the require() statement which should find it via the $LOAD_PATH array. Otherwise where the mixin file resides (it's path,) has no bearing on anything else. (Once it's loaded.. it is refered to as Mixin::LoadInstructor and it's path is irrelevant.)

So really yout mixin NEEDS to use the @@tool_filepath class variable in both cases (an rb or rbs.)

And the tool author needs to always set it to the path of his tool script file, either:
@@tool_filepath = __FILE__ # for unscrambled
or
@@tool_filepath = SOME_CONSTANT # (or a literal,) for scrambled rbs.
If the author is smart, they will wrap their loader and declare their path constant, in the same tool class namespace their rbs code in wrapped in.

Dan Rathbun

@bentleykfrog said:

Dan, your advice is invaluable. There's still a couple of things I'm concerned about:

Regarding the @@tool_filepath issue, you should still be able to declare these paths in the second and third attributes of lins_setup()? like:

@@tool_filepath would contain the "your_scripts_folder" so to get just the path part use:
File.dirname(@@tool_filepath)
which removes the actual tool script filename, leaving the relative path from one of the $LOAD_PATH members. You can then expand it to get the tool script's absolute folder path.

So your thinking.. what's the difference in making the author use a variable or making them use a method argument ??
Well IMHO the variable is cleaner, set once and forget. And that variable can be referenced by other methods written by the tool author.

Here's an example of a rbs loader script that loads a scrambled tool script named testtool.rbs:

module Niall
  class TestTool
    require('mixin/load_instructor.rb')
    include( Mixin;;LoadInstructor )
    @@tool_filepath = File.dirname(__FILE__)+'/testtool.rbs'
    Sketchup.require( @@tool_filepath )
  end # class
end # module

In this example, the author does the 'mixing' in the loader, sets @@tool_filepath and uses it in his call to load the rbs.