File kitsh/buildsrc/kitsh-0.0/boot.tcl artifact 22b7e78c5d part of check-in e95acf08f0

proc tclInit {} {
  rename tclInit {}

  global auto_path tcl_library tcl_libPath
  global tcl_version tcl_rcFileName
  
  set noe [info nameofexecutable]

  # Resolve symlinks
  set noe [file dirname [file normalize [file join $noe __dummy__]]]

  set tcl_library [file join $noe lib tcl$tcl_version]
  set tcl_libPath [list $tcl_library [file join $noe lib]]

  # get rid of a build residue
  unset -nocomplain ::tclDefaultLibrary

  # the following code only gets executed once on startup
  if {[info exists tcl_rcFileName]} {
    load {} vfs

    # lookup and emulate "source" of lib/vfs/{vfs*.tcl,mk4vfs.tcl}
    # must use raw MetaKit calls because VFS is not yet in place
    set d [mk::select exe.dirs parent 0 name lib]
    set d [mk::select exe.dirs parent $d name vfs]
    
    foreach x {vfsUtils vfslib mk4vfs} {
      set n [mk::select exe.dirs!$d.files name $x.tcl]
      set s [mk::get exe.dirs!$d.files!$n contents]
      catch {set s [zlib decompress $s]}
      uplevel #0 $s
    }

    # use on-the-fly decompression, if mk4vfs understands that
    set mk4vfs::zstreamed 1

    # mount the executable, i.e. make all runtime files available
    vfs::filesystem mount $noe [list ::vfs::mk4::handler exe]

    # alter path to find encodings
    if {[info tclversion] eq "8.4"} {
      load {} pwb
      librarypath [info library]
    } else {
      encoding dirs [list [file join [info library] encoding]] ;# TIP 258
    }

    # fix system encoding, if it wasn't properly set up (200207.004 bug)
    if {[encoding system] eq "identity"} {
      switch $::tcl_platform(platform) {
        windows		{ encoding system cp1252 }
        macintosh	{ encoding system macRoman }
        default		{ encoding system iso8859-1 }
      }
    }

    # now remount the executable with the correct encoding
    #vfs::filesystem unmount $noe
    vfs::filesystem unmount [lindex [::vfs::filesystem info] 0]

    set noe [info nameofexecutable]

  	# Resolve symlinks
  	set noe [file dirname [file normalize [file join $noe __dummy__]]]

    set tcl_library [file join $noe lib tcl$tcl_version]
    set tcl_libPath [list $tcl_library [file join $noe lib]]
    vfs::filesystem mount $noe [list ::vfs::mk4::handler exe]
  }
  
  # load config settings file if present
  namespace eval ::vfs { variable tclkit_version 1 }
  catch { uplevel #0 [list source [file join $noe config.tcl]] }

  uplevel #0 [list source [file join $tcl_library init.tcl]]
  
# reset auto_path, so that init.tcl's search outside of tclkit is cancelled
  set auto_path $tcl_libPath
}