File kitsh/buildsrc/kitsh-0.0/boot.tcl artifact 877050aa4b part of check-in 0ed07039ad

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]} {
		# lookup and emulate "source" of lib/vfs/{vfs*.tcl,mk4vfs.tcl}
		switch -- $::tclKitStorage {
			"mk4" {
				load {} vfs

				# 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

				# Set VFS handler name
				set vfsHandler [list ::vfs::mk4::handler exe]
			}
			"zip" {
				set prefix "lib/vfs"
				foreach file [list vfsUtils vfslib] {
					set fullfile "${prefix}/${file}.tcl"

					::zip::stat $::tclKitStorage_fd $fullfile finfo
					seek $::tclKitStorage_fd $finfo(ino)
					zip::Data $::tclKitStorage_fd sb s

					switch -- $file {
						"vfsUtils" {
							# Preserve our working "::vfs::zip" implementation
							# so we can replace it after the stub is replaced
							# from vfsUtils
							# The correct implementation will be provided by vfslib, 
							# but only if we can read it
							rename ::vfs::zip ::vfs::zip_impl
						}
					}

					uplevel #0 $s

					switch -- $file {
						"vfsUtils" {
							# Restore preserved "::vfs:zip" implementation
							rename ::vfs::zip {}
							rename ::vfs::zip_impl ::vfs::zip
						}
					}
				}

				seek $::tclKitStorage_fd 0
				set vfsHandler [list ::vfs::zip::handler $::tclKitStorage_fd]
				unset ::tclKitStorage_fd
			}
		}

		# mount the executable, i.e. make all runtime files available
		vfs::filesystem mount $noe $vfsHandler

		# 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"} {
			if {[info exists ::tclkit_system_encoding] && $::tclkit_system_encoding != ""} {
				encoding system $::tclkit_system_encoding
			} else {
				switch $::tcl_platform(platform) {
					windows		{ encoding system cp1252 }
					macintosh	{ encoding system macRoman }
				        default		{ encoding system iso8859-1 }
				}
			}

			unset -nocomplain ::tclkit_system_encoding
		}

		# now remount the executable with the correct encoding
		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 $vfsHandler
	}
  
	# 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

	# This loads everything needed for "clock scan" to work
	# "clock scan" is used within "vfs::zip", which may be
	# loaded before this is run causing the root VFS to break
	catch { clock scan }

	# Cleanup
	unset ::tclKitStorage
	unset -nocomplain ::tclKitStorage_fd
}