Tcl wrapper for Pashua

Pashua is a very very simple GUI builder for MacOSX scripting languages. The author (Carsten Bluem [L1 ]) has demos written in PHP, Perl, Python, sh and AppleScript. I hope to submit a Tcl wrapper and demo. As I'm a rank beginner with respect to Tcl, I'm posting my code here so that others more adept with Tcl can critique the code before submission.


 #wrapper for Pashua in Tcl
 #Bruce M. Axtens, 2004.

 proc pashua_run {script} {

        upvar #0 argv0 appName 
        upvar #0 env   envir
        
        set tempFile [exec /usr/bin/mktemp /tmp/Pashua_XXXXXXXX]
        set handle [open $tempFile w]
        puts $handle $script
        close $handle
                
        
        #search for Pashua binary
        set bundlePath "Pashua.app/Contents/MacOS/Pashua"
        set theHome $envir(HOME)
        set theList [list "$appName/Pashua" \
                "$appName/$bundlePath" \
                "/$bundlePath" \
                "./$bundlePath" \
                "/Applications/$bundlePath" \
                "$theHome/Applications/$bundlePath" ]
        
        set theBinary ""
        foreach possib $theList {
                if {[file exists $possib]} then {
                        if {[file executable $possib]} then {
                                set theBinary $possib
                                break
                        }
                }
        }
        if {$theBinary ne ""} {
                set handle [open "|$theBinary $tempFile" r]
                while {[eof $handle]==0} {
                        gets $handle theLine
                        set equals [string first {=} $theLine]
                        if {$equals > -1} {
                                array set results \
                                 [list [string range $theLine 0 [expr $equals - 1]] \
                                       [string range $theLine [expr $equals + 1] end]]
                        }
                }
                return [array get results]
                        
        } else {
                return ""
        }        
        
 }

The following is a test script (test.tcl) based on Blüm's one for Perl. Any suggestions to make it more Tcl-ish? Make sure if you copy this code out to a file that you remove the indent as Pashua will treat " tcl_type" as " tcl_type" not "tcl_type".

        #!/usr/bin/tclsh
        source pashua_run.tcl
        
        set res [pashua_run {
        # Lines starting with a hash character are
        # comments, empty lines are ignored
        # Set transparency: 0 is transparent, 1 is opaque
        transparency=0.95
        
        # Set window title
        windowtitle=Our first example. Isn't it simple?
         
        # Define a checkbox 'I like Tcl', default: checked
        tcl_type=checkbox
        tcl_label=I like Tcl
        tcl_default=1
         
        # Define radiobuttons
        book_type=radiobutton
        book_label=Which Tcl book do you prefer?
        book_option=Practical Programming in Tcl and Tk
        book_option=The Perl Cookbook
        book_default=Practical Programming in Tcl and Tk
         
        # Define a popup menu
        editor_type=popup
        editor_label=What's your favourite editor for the Mac?
        editor_width=320
        editor_option=AlphaX
        editor_option=Alphatk
        editor_option=BBedit
        editor_option=BBedit Lite
        editor_option=Emacs
        editor_option=jEdit
        editor_option=MacPerl
        editor_option=NEdit
        editor_option=Pepper
        editor_option=Perlidex
        editor_option=SubEthaEdit
        editor_option=vi/vim
        editor_option=XPerlEdit
        editor_option=joe
        editor_option=Something else
        editor_default=BBedit Lite
         
        # Add a filesystem browser
        fs_type=openbrowser
        fs_label=Some file or folder location
        fs_width=320
         
        # A separator line
        -
        # Define a text field , default: 'user'
        user_type=textfield
        user_label=Enter your username
        user_width=320
        user_default=useR
         
        # Define a password field
        pwd_label=Enter your password
        pwd_type=password
        pwd_width=320
         
        # Define a combobox 
        host_label=Enter a hostname or IP to connect to
        host_type=combobox
        host_width=320
        host_option=www.apple.com
        host_option=q41.de
        host_option=wiki.tcl.tk
        host_option=localhost
        host_default=wiki.tcl.tk
         
        # Add a cancel button - if you like, you can set the
        # button label by uncommenting the second line below
        cncl_type=cancelbutton
        #cncl_label=If you click here, no values will be returned
        }]
         
        array set x $res
        puts "I [expr {$x(tcl)==1 ? "like" : "don't like"}] Tcl.\
 I read \"$x(book)\" for inspiration and\
 code using $x(editor). \
 My username is '$x(user)' and \
 the password you entered was '$x(pwd)'."