Eskil

# Stop Tk from meddling with the command line by copying it first.
set ::eskil(argv) $::argv
set ::eskil(argc) $::argc
set ::argv {}
set ::argc 0

set debug 0
set diffver "Version 2.0.7+ 2005-03-24"
set debug 1
set diffver "Version 2.0.7+ 2005-07-21"
set ::thisScript [file join [pwd] [info script]]

# Do initalisations for needed packages and globals.
# This is not run until needed to speed up command line error reporting.
proc Init {} {
    package require Tk 8.4
    catch {package require textSearch}

        set tmplink [file readlink $tmplink]
        set tmplink [file normalize [file join $::thisDir $tmplink]]
        set ::thisDir [file dirname $tmplink]
    }

    # Get all other source files
    source $::thisDir/clip.tcl
    source $::thisDir/compare.tcl
    source $::thisDir/map.tcl
    source $::thisDir/registry.tcl
    source $::thisDir/dirdiff.tcl
    source $::thisDir/help.tcl
    source $::thisDir/print.tcl
    source $::thisDir/rev.tcl

        foreach f $::tmpfiles {
            catch {file delete $f}
        }
        set ::tmpfiles {}
    }
}

# Compare two lines and rate how much they resemble each other.
# This has never worked well. Some day I'll sit down, think this through,
# and come up with a better algorithm.
proc compareLines2 {line1 line2} {
    set opts $::Pref(ignore)
    if {$::Pref(nocase)} {lappend opts -nocase}
    set res [eval DiffUtil::diffStrings $opts \$line1 \$line2]

    # Collect identical pieces and different pieces
    set sames {}
    set diffs1 {}
    set diffs2 {}
    foreach {same1 same2 diff1 diff2} $res {
        lappend sames $same1
        if {$diff1 != ""} {
            lappend diffs1 $diff1
        }
        if {$diff2 != ""} {
            lappend diffs2 $diff2
        }
    }
    set sumsame 0
    set sumdiff1 0
    set sumdiff2 0
    foreach same $sames {
        set apa [string length [string trim $same]]
        incr sumsame [expr {$apa * $apa}]
    }
    foreach diff $diffs1 {
        set apa [string length $diff]
        incr sumdiff1 $apa
    }
    foreach diff $diffs2 {
        set apa [string length $diff]
        incr sumdiff2 $apa
    }
#    puts "Same ($sames)"
#    puts "D1   ($diffs1)"
#    puts "D2   ($diffs2)"
#    puts "S $sumsame D $sumdiff1 D $sumdiff2"
    return [expr {$sumsame - [maxAbs $sumdiff1 $sumdiff2]}]
}

# Initialise a multidimensional list with some value
# This should use lrepeat once 8.5 is required
# The args are in the same order as indexes to lset/lindex
proc Linit {elem args} {
    for {set t [expr {[llength $args] - 1}]} {$t >= 0} {incr t -1} {
	set new {}
	for {set j [lindex $args $t]} {$j >= 1} {incr j -1} {
	    lappend new $elem
	}
	set elem $new
    }
    return $elem
}

# Decide how to display change blocks
# This tries to match the lines that resemble each other and put them
# next to each other.
# As compareLines2, this would need a complete rework and a
# better algorithm.
proc compareBlocks {block1 block2} {
    set size1 [llength $block1]
    set size2 [llength $block2]

    # Swap if block1 is bigger
    if {$size1 > $size2} {
        set apa $block1
        set block1 $block2
        set block2 $apa
        set size1 [llength $block1]
        set size2 [llength $block2]
        set dsym a
        set asym d
    } else {
        set dsym d
        set asym a
    }

    # Collect statistics
    set scores [Linit {} $size1 $size2]
    set emptyResult [Linit {} $size1]
    set scoresbest $emptyResult
    set origresult $emptyResult

    set j 0
    set bestsum 0
    foreach line1 $block1 {
        set bestscore -100000
        set bestline 0
        set i 0
        foreach line2 $block2 {
            set x [compareLines2 $line1 $line2]
            lset scores $j $i $x
            #puts "Score $j $i : $x"
            if {$x > $bestscore} {
                set bestscore $x
                set bestline $i
            }
            incr i
        }
        #puts "Best for $j is $bestline : $bestscore"
        lset origresult $j $bestline
        lset scoresbest $j $bestscore
        incr bestsum $bestscore
        incr j
    }
    #puts "Bestsum: $bestsum"

    # origresult holds a mapping between blocks where each row
    # is paired with its best match. This may not be a possible
    # result since it has to be in order.

    #puts "Origresult: $origresult"

    # If the size is 1, it is automatically in order so we
    # don't need further processing.

    if {$size1 > 1} {
        # Start with a check if the theoretical best works, since often that
        # is the case.
        set order 1
        set result $origresult
        for {set i 0} {$i < ($size1 - 1)} {incr i} {
            if {[lindex $result $i] >= [lindex $result [expr {$i + 1}]]} {
                set order 0
                break
            }
        }
        #if {$order} {puts "ORDER"}
    }

    set bestresult $origresult
    set bestscoresum -100000

    if {$size1 > 1 && $order == 0} {
        # Look through the obvious "subblock" alternatives

        for {set startj 0} {$startj < ($size2 - $size1 + 1)} {incr startj} {
	    set sum 0
	    set result $emptyResult
	    for {set i 0 ; set j $startj} {$i < $size1} {incr i ; incr j} {
		lset result $i $j
		incr sum [lindex $scores $i $j]
	    }
	    #puts "Subblock $startj sum: $sum"
            if {$sum > $bestscoresum} {
                #puts "New best: $sum ($bestscoresum)"
                set bestresult $result
                set bestscoresum $sum
            }
	}

        # If we reach 75% if the theoretical best, we take it
        while {$bestscoresum < (3 * $bestsum / 4)} {
            #puts "Outer: $scoresbest"
	    # The outer loop restarts from the "best mapping"
	    set result $origresult
            set mark [Linit 0 $size1]
            set high $mark

            # If result is in order, no problem.
            # Otherwise, try to adjust result to make it ordered

            while {1} {
                #puts "Inner: $scoresbest"
		# The inner loop tries to get the result in order
                set besti 0
                set bestscore -100000
                set order 1
                for {set i 0} {$i < $size1} {incr i} {
                    if {[lindex $mark $i] == 0} {
                        for {set j [expr {$i + 1}]} {$j < $size1} {incr j} {
                            if {[lindex $mark $j] == 0} break
                        }
                        if {$j < $size1 && \
                                [lindex $result $i] >= [lindex $result $j]} {
                            set order 0
                        }
                        set x [lindex $scoresbest $i]
                        if {$x > $bestscore} {
                            set bestscore $x
                            set besti $i
                        }
                    }
                }
                #puts "Best $besti order $order sc $bestscore"
                if {$order} break
                lset mark $besti 1
                set bestr [lindex $result $besti]
                for {set i 0} {$i < $besti} {incr i} {
                    if {[lindex $mark $i] == 0 && \
                            [lindex $result $i] >= $bestr} {
                        lset mark $i 2
                    }
                }
                for {set i [expr {$besti + 1}]} {$i < $size1} {incr i} {
                    if {[lindex $mark $i] == 0 && \
                            [lindex $result $i] <= $bestr} {
                        lset mark $i 2
                    }
                }
            }

            set prev $size2
            for {set i [expr {$size1 - 1}]} {$i >= 0} {incr i -1} {
                if {[lindex $mark $i] != 2} {
                    set prev [lindex $result $i]
                } else {
                    lset high $i [expr {$prev - 1}]
                }
            }
            set prev -1
            for {set i 0} {$i < $size1} {incr i} {
                if {[lindex $mark $i] != 2} {
                    set prev [lindex $result $i]
                } else {
                    if {[lindex $high $i] > $prev} {
                        incr prev
                        lset result $i $prev
                    } else {
                        lset result $i -1
                    }
                }
            }
            set scoresum 0
            for {set i 0} {$i < $size1} {incr i} {
                set j [lindex $result $i]
                set sc [lindex $scores $i $j] ;# FIXA: can this fail?
                if {[string is integer -strict $sc]} {
                    #puts "Score: $i $j [lindex $scores $i $j]"
                    incr scoresum $sc
                }
            }
            #puts "Scoresum: $scoresum ($bestscoresum)"

	    # If it was not an improvement over previous iteration, quit
            if {$scoresum <= $bestscoresum} {
                break
	    }

	    set bestresult $result
	    set bestscoresum $scoresum

	    # We are redoing from start, but try to improve by
	    # ignoring the most awkwardly placed line.
	    set mostp -1
	    set mosti 0
	    for {set i 0} {$i < $size1} {incr i} {
		if {[lindex $mark $i] == 1} {
		    if {abs([lindex $result $i] - $i) > $mostp} {
			set mostp [expr {abs([lindex $result $i] - $i)}]
                        set mosti $i
		    }
		}
	    }
	    #puts "Most $mosti $mostp"
	    lset scoresbest $mosti 0
        }
    }

    set result $bestresult

    # Collect the result into diff-like codes to use as display info.

    set apa {}
    set t1 0
    set t2 0
    while {$t1 < $size1 || $t2 < $size2} {
        if {$t1 < $size1} {
            set r [lindex $result $t1]
            if {$r < $t2 || $t2 >= $size2} {
                lappend apa $dsym
                incr t1
            } elseif {$r == $t2} {
                #if {[string match Wm* [lindex $block2 $t2]]} {
                #    puts "Left : [lindex $block1 $t1]"
                #    puts "Right: [lindex $block2 $t2]"
                #    puts "Score: $scores($t1,$t2)"
                #}

                # If the score is too bad, don't do line parsing.
                if {[lindex $scores $t1 $t2] < 0} {
                    lappend apa "C"
                } else {
                    lappend apa "c"
                }
                incr t1
                incr t2
            } else {
                lappend apa $asym
                incr t2
            }
        } else {
            lappend apa $asym
            incr t2
        }
    }
    return $apa
}

# Insert lineno and text
proc insertLine {top n line text {tag {}}} {
    $::widgets($top,wDiff$n) insert end "$text\n" $tag
    if {$tag != ""} {
        set tag "hl$::HighLightCount $tag"
    }
    $::widgets($top,wLine$n) insert end [myFormL $line] $tag

                addChange $top $n1 $tag1 $line1 $n1 $line2 $n2
            }
        }
    }
}

proc enableRedo {top} {
    $top.mf.m entryconfigure "Redo Diff" -state normal
    $top.mt.m entryconfigure "Merge"     -state normal
    $top.m.mf entryconfigure "Redo Diff" -state normal
    $top.m.mt entryconfigure "Merge"     -state normal
}

proc disableRedo {top} {
    $top.mf.m entryconfigure "Redo Diff" -state disabled
    $top.mt.m entryconfigure "Merge"     -state disabled
    $top.m.mf entryconfigure "Redo Diff" -state disabled
    $top.m.mt entryconfigure "Merge"     -state disabled
}

proc busyCursor {top} {
    global oldcursor oldcursor2
    if {![info exists oldcursor]} {
        set oldcursor [$top cget -cursor]
        set oldcursor2 [$::widgets($top,wDiff1) cget -cursor]

# Editing
#####################################

# Clear Editing state
proc resetEdit {top} {
    set ::diff($top,leftEdit) 0
    set ::diff($top,rightEdit) 0
    $top.mt.m entryconfigure "Edit Mode" -state normal
    $top.m.mt entryconfigure "Edit Mode" -state normal

    resetEditW $::widgets($top,wDiff1)
    resetEditW $::widgets($top,wDiff2)
}

# Clear Editing state for a Text widget
proc resetEditW {w} {

    $w configure -undo 1

    set ::diff($w,allowChange) line
}

# Turn on editing on sides where it has not been disallowed
proc allowEdit {top} {
    $top.mt.m entryconfigure "Edit Mode" -state disable
    $top.m.mt entryconfigure "Edit Mode" -state disable
    if {$::diff($top,leftEdit) == 0} {
        set ::diff($top,leftEdit) 1
        turnOnEdit $::widgets($top,wDiff1)
    }
    if {$::diff($top,rightEdit) == 0} {
        set ::diff($top,rightEdit) 1
        turnOnEdit $::widgets($top,wDiff2)
    }
}

# Turn off editing on sides that do not correspond to a file
proc disallowEdit {top {side 0}} {
    if {$side == 0 || $side == 1} {
        set ::diff($top,leftEdit) -1
    }
    if {$side == 0 || $side == 2} {
        set ::diff($top,rightEdit) -1
    }
    if {$::diff($top,leftEdit) == -1 && $::diff($top,rightEdit) == -1} {
        $top.mt.m entryconfigure "Edit Mode" -state disabled
        $top.m.mt entryconfigure "Edit Mode" -state disabled
    }
}

# Ask if editing is allowed on a side
proc mayEdit {top side} {
    if {$side == 1} {
        return [expr {$::diff($top,leftEdit) == 1}]

        lappend ::diff(diffWindows) $top
    }

    wm title $top "Eskil:"
    wm protocol $top WM_DELETE_WINDOW [list cleanupAndExit $top]

    frame $top.f
    grid $top.f -row 0 -columnspan 4 -sticky news
    grid $top.f -row 0 -columnspan 4 -sticky nws
    lappend ::widgets(toolbars) $top.f
    if {!$::Pref(toolbar)} {
        grid remove $top.f
    }

    if {$tcl_platform(platform) eq "windows"} {
        #frame $top.f.line -height 1 -bg SystemButtonHighlight
        #pack $top.f.line -side bottom -fill x
    }

    menu $top.m
    $top configure -menu $top.m

    menubutton $top.mf -text "File" -underline 0 -menu $top.mf.m
    menu $top.mf.m
    $top.mf.m add command -label "Redo Diff" -underline 5 \
    $top.m add cascade -label "File" -underline 0 -menu $top.m.mf
    menu $top.m.mf
    $top.m.mf add command -label "Redo Diff" -underline 5 \
            -command [list redoDiff $top] -state disabled
    if {$debug == 1} {
        $top.mf.m entryconfigure "Redo Diff" -state normal
        $top.m.mf entryconfigure "Redo Diff" -state normal
    }
    $top.mf.m add separator
    $top.mf.m add command -label "Open Both..." -underline 0 \
    $top.m.mf add separator
    $top.m.mf add command -label "Open Both..." -underline 0 \
            -command [list openBoth $top 0]
    $top.mf.m add command -label "Open Both (forget)..." \
    $top.m.mf add command -label "Open Both (forget)..." \
            -command [list openBoth $top 1]
    $top.mf.m add command -label "Open Left File..." \
    $top.m.mf add command -label "Open Left File..." \
            -command [list openLeft $top]
    $top.mf.m add command -label "Open Right File..." \
    $top.m.mf add command -label "Open Right File..." \
            -command [list openRight $top]
    $top.mf.m add separator
    $top.mf.m add command -label "Open Conflict File..." \
    $top.m.mf add separator
    $top.m.mf add command -label "Open Conflict File..." \
            -command [list openConflict $top]
    $top.mf.m add command -label "Open Patch File..." \
    $top.m.mf add command -label "Open Patch File..." \
            -command [list openPatch $top]
    $top.mf.m add command -label "Revision Diff..." -underline 0 \
    $top.m.mf add command -label "Revision Diff..." -underline 0 \
            -command [list openRev $top]
    $top.mf.m add separator
    $top.mf.m add command -label "Print..." -underline 0 \
    $top.m.mf add separator
    $top.m.mf add command -label "Print..." -underline 0 \
            -command [list doPrint $top]
    $top.mf.m add separator
    $top.mf.m add command -label "Close" -underline 0 \
    $top.m.mf add separator
    $top.m.mf add command -label "Close" -underline 0 \
            -command [list cleanupAndExit $top]
    $top.mf.m add separator
    $top.mf.m add command -label "Quit" -underline 0 \
    $top.m.mf add separator
    $top.m.mf add command -label "Quit" -underline 0 \
            -command {cleanupAndExit all}

    menubutton $top.mo -text "Options" -underline 0 -menu $top.mo.m
    menu $top.mo.m
    $top.mo.m add cascade -label "Font" -underline 0 -menu $top.mo.mf
    $top.mo.m add cascade -label "Ignore" -underline 0 -menu $top.mo.mi
    $top.mo.m add command -label "Preprocess..." -underline 0 \
    $top.m add cascade -label "Options" -underline 0 -menu $top.m.mo
    menu $top.m.mo
    $top.m.mo add cascade -label "Font" -underline 0 -menu $top.m.mo.f
    $top.m.mo add cascade -label "Ignore" -underline 0 -menu $top.m.mo.i
    $top.m.mo add command -label "Preprocess..." -underline 0 \
            -command [list EditPrefRegsub $top]
    $top.mo.m add cascade -label "Parse" -underline 1 -menu $top.mo.mp
    $top.mo.m add command -label "Colours..." -underline 0 -command makePrefWin
    $top.mo.m add cascade -label "Context" -underline 1 -menu $top.mo.mc
    $top.mo.m add separator
    $top.mo.m add command -label "Save default" \
    $top.m.mo add cascade -label "Parse" -underline 1 -menu $top.m.mo.p
    $top.m.mo add command -label "Colours..." -underline 0 -command makePrefWin
    $top.m.mo add cascade -label "Context" -underline 1 -menu $top.m.mo.c
    $top.m.mo add separator
    $top.m.mo add checkbutton -label "Toolbar" -variable ::Pref(toolbar)
    $top.m.mo add separator
    $top.m.mo add command -label "Save default" \
            -command [list saveOptions $top]

    menu $top.mo.mf
    $top.mo.mf add command -label "Select..." -command makeFontWin -underline 0
    $top.mo.mf add radiobutton -label 6 -variable Pref(fontsize) -value 6 \
    menu $top.m.mo.f
    $top.m.mo.f add command -label "Select..." -command makeFontWin \
            -underline 0
    $top.m.mo.f add radiobutton -label 6 -variable Pref(fontsize) -value 6 \
            -command chFont
    $top.mo.mf add radiobutton -label 7 -variable Pref(fontsize) -value 7 \
    $top.m.mo.f add radiobutton -label 7 -variable Pref(fontsize) -value 7 \
            -command chFont
    $top.mo.mf add radiobutton -label 8 -variable Pref(fontsize) -value 8 \
    $top.m.mo.f add radiobutton -label 8 -variable Pref(fontsize) -value 8 \
            -command chFont
    $top.mo.mf add radiobutton -label 9 -variable Pref(fontsize) -value 9 \
    $top.m.mo.f add radiobutton -label 9 -variable Pref(fontsize) -value 9 \
            -command chFont
    $top.mo.mf add radiobutton -label 10 -variable Pref(fontsize) -value 10 \
    $top.m.mo.f add radiobutton -label 10 -variable Pref(fontsize) -value 10 \
            -command chFont

    menu $top.mo.mi
    $top.mo.mi add radiobutton -label "No spaces" \
    menu $top.m.mo.i
    $top.m.mo.i add radiobutton -label "No spaces" \
            -variable Pref(ignore) -value " "
    $top.mo.mi add radiobutton -label "Space changes (-b)" \
    $top.m.mo.i add radiobutton -label "Space changes (-b)" \
            -variable Pref(ignore) -value "-b"
    $top.mo.mi add radiobutton -label "All spaces (-w)" \
    $top.m.mo.i add radiobutton -label "All spaces (-w)" \
            -variable Pref(ignore) -value "-w"
    $top.mo.mi add separator
    $top.mo.mi add checkbutton -label "Case (-i)" \
    $top.m.mo.i add separator
    $top.m.mo.i add checkbutton -label "Case (-i)" \
            -variable Pref(nocase)
    $top.mo.mi add checkbutton -label "Digits" \
    $top.m.mo.i add checkbutton -label "Digits" \
            -variable Pref(nodigit)

    menu $top.mo.mp
    $top.mo.mp add radiobutton -label "Nothing" -variable Pref(parse) -value 0
    $top.mo.mp add radiobutton -label "Lines" -variable Pref(parse) -value 1
    $top.mo.mp add radiobutton -label "Blocks (small)" -variable Pref(parse) \
    menu $top.m.mo.p
    $top.m.mo.p add radiobutton -label "Nothing" -variable Pref(parse) -value 0
    $top.m.mo.p add radiobutton -label "Lines" -variable Pref(parse) -value 1
    $top.m.mo.p add radiobutton -label "Blocks (small)" -variable Pref(parse) \
            -value 2
    $top.mo.mp add radiobutton -label "Blocks" -variable Pref(parse) -value 3
    $top.mo.mp add separator
    $top.mo.mp add radiobutton -label "Characters" \
    $top.m.mo.p add radiobutton -label "Blocks" -variable Pref(parse) -value 3
    $top.m.mo.p add separator
    $top.m.mo.p add radiobutton -label "Characters" \
            -variable Pref(lineparsewords) -value "0"
    $top.mo.mp add radiobutton -label "Words" \
    $top.m.mo.p add radiobutton -label "Words" \
            -variable Pref(lineparsewords) -value "1"
    $top.mo.mp add separator
    $top.mo.mp add checkbutton -label "Mark last" -variable Pref(marklast)
    $top.m.mo.p add separator
    $top.m.mo.p add checkbutton -label "Mark last" -variable Pref(marklast)

    menu $top.mo.mc
    $top.mo.mc add radiobutton -label "Show all lines" \
    menu $top.m.mo.c
    $top.m.mo.c add radiobutton -label "Show all lines" \
            -variable ::Pref(context) -value 0
    $top.mo.mc add separator
    $top.mo.mc add radiobutton -label "Context 2 lines" \
    $top.m.mo.c add separator
    $top.m.mo.c add radiobutton -label "Context 2 lines" \
            -variable ::Pref(context) -value 2
    $top.mo.mc add radiobutton -label "Context 5 lines" \
    $top.m.mo.c add radiobutton -label "Context 5 lines" \
            -variable ::Pref(context) -value 5
    $top.mo.mc add radiobutton -label "Context 10 lines" \
    $top.m.mo.c add radiobutton -label "Context 10 lines" \
            -variable ::Pref(context) -value 10
    $top.mo.mc add radiobutton -label "Context 20 lines" \
    $top.m.mo.c add radiobutton -label "Context 20 lines" \
            -variable ::Pref(context) -value 20

    menubutton $top.ms -text "Search" -underline 0 -menu $top.ms.m
    menu $top.ms.m
    $top.m add cascade -label "Search" -underline 0 -menu $top.m.ms
    menu $top.m.ms
    if {[info procs textSearch::searchMenu] != ""} {
        textSearch::searchMenu $top.ms.m
        textSearch::searchMenu $top.m.ms
    } else {
        $top.ms.m add command -label "Text search not available" \
        $top.m.ms add command -label "Text search not available" \
                -state disabled
    }

    menubutton $top.mt -text "Tools" -underline 0 -menu $top.mt.m
    menu $top.mt.m
    $top.mt.m add command -label "New Diff Window" -underline 0 \
    $top.m add cascade -label "Tools" -underline 0 -menu $top.m.mt
    menu $top.m.mt
    $top.m.mt add command -label "New Diff Window" -underline 0 \
            -command makeDiffWin
    $top.mt.m add command -label "Directory Diff" -underline 0 \
    $top.m.mt add command -label "Directory Diff" -underline 0 \
            -command makeDirDiffWin
    $top.mt.m add command -label "Clip Diff" -underline 0 \
    $top.m.mt add command -label "Clip Diff" -underline 0 \
            -command makeClipDiffWin
    $top.mt.m add command -label "Merge" -underline 0 \
    $top.m.mt add command -label "Merge" -underline 0 \
            -command [list makeMergeWin $top] -state disabled
    $top.mt.m add command -label "Edit Mode" -underline 0 \
    $top.m.mt add command -label "Edit Mode" -underline 0 \
            -command [list allowEdit $top] -state disabled
    $top.mt.m add command -label "Clear Align" \
    $top.m.mt add command -label "Clear Align" \
            -command [list clearAlign $top] -state disabled
    set ::widgets($top,enableAlignCmd) [list \
            $top.mt.m entryconfigure "Clear Align" -state normal]
            $top.m.mt entryconfigure "Clear Align" -state normal]
    set ::widgets($top,disableAlignCmd) [list \
            $top.mt.m entryconfigure "Clear Align" -state disabled]
            $top.m.mt entryconfigure "Clear Align" -state disabled]

    if {$::tcl_platform(platform) eq "windows"} {
        if {![catch {package require registry}]} {
            $top.mt.m add separator
            $top.mt.m add command -label "Setup Registry" -underline 6 \
            $top.m.mt add separator
            $top.m.mt add command -label "Setup Registry" -underline 6 \
                    -command makeRegistryWin
        }
    }

    menubutton $top.mh -text "Help" -underline 0 -menu $top.mh.m
    menu $top.mh.m
    $top.mh.m add command -label "General" -command makeHelpWin -underline 0
    $top.mh.m add command -label "Tutorial" -command makeTutorialWin \
    $top.m add cascade -label "Help" -underline 0 -menu $top.m.help
    menu $top.m.help
    $top.m.help add command -label "General" -command makeHelpWin -underline 0
    $top.m.help add command -label "Tutorial" -command makeTutorialWin \
            -underline 0
    foreach label {{Revision Control} {Edit Mode}} \
            file {revision.txt editmode.txt} {
        $top.mh.m add command -label $label -command [list makeDocWin $file] \
                -underline 0
        $top.m.help add command -label $label \
                -command [list makeDocWin $file] -underline 0
    }
    $top.mh.m add separator
    $top.mh.m add command -label "About" -command makeAboutWin -underline 0
    $top.m.help add separator
    $top.m.help add command -label "About" -command makeAboutWin -underline 0

    label $top.lr1 -text "Rev 1"
    addBalloon $top.lr1 "Revision number for CVS/RCS/ClearCase diff."
    entry $top.er1 -width 12 -textvariable diff($top,doptrev1)
    set ::widgets($top,rev1) $top.er1
    label $top.lr2 -text "Rev 2"
    addBalloon $top.lr2 "Revision number for CVS/RCS/ClearCase diff."

    bind $top <Key-Prior> [list scrollText $top -1 p]
    bind $top <Key-Next>  [list scrollText $top  1 p]
    bind $top <Key-Escape> [list focus $top]
    if {$debug == 0} {
        bind $top <Key> "backDoor %A"
    }

    pack $top.mf $top.mo $top.ms $top.mt -in $top.f -side left -anchor n
    pack $top.mh -in $top.f -side left -anchor n
    pack $top.bfn -in $top.f -side right -padx {3 6}
    pack $top.bfp $top.er2 $top.lr2 $top.er1 $top.lr1 \
            -in $top.f -side right -padx 3
    if {$debug == 1} {
        menubutton $top.md -text "Debug" -menu $top.md.m -underline 0
        menu $top.md.m
        $top.m add cascade -label "Debug" -menu $top.m.md -underline 0
        menu $top.m.md
        if {$tcl_platform(platform) eq "windows"} {
            $top.md.m add checkbutton -label "Console" -variable consolestate \
            $top.m.md add checkbutton -label "Console" -variable consolestate \
                    -onvalue show -offvalue hide \
                    -command {console $consolestate}
            $top.md.m add separator
            $top.m.md add separator
        }
        $top.md.m add checkbutton -label "Wrap" -variable wrapstate \
        $top.m.md add checkbutton -label "Wrap" -variable wrapstate \
                -onvalue char -offvalue none -command \
                "$top.ft1.tt configure -wrap \$wrapstate ;\
                $top.ft2.tt configure -wrap \$wrapstate"
        $top.md.m add command -label "Date Filter" \
        $top.m.md add command -label "Date Filter" \
                -command {set ::diff(filter) {^Date}}
        $top.md.m add separator
        $top.md.m add command -label "Reread Source" -underline 0 \
        $top.m.md add separator
        $top.m.md add command -label "Reread Source" -underline 0 \
                -command {EskilRereadSource}
        $top.md.m add separator
        $top.md.m add command -label "Redraw Window" \
        $top.m.md add separator
        $top.m.md add command -label "Redraw Window" \
                -command [list makeDiffWin $top]
        $top.md.m add separator
        $top.md.m add command -label "Normal Cursor" \
        $top.m.md add separator
        $top.m.md add command -label "Normal Cursor" \
                -command [list normalCursor $top]
        $top.md.m add separator
        $top.md.m add command -label "Evalstats" -command {evalstats}
        $top.md.m add command -label "_stats" -command {parray _stats}
        $top.md.m add command -label "Nuisance" -command [list makeNuisance \
        $top.m.md add separator
        $top.m.md add command -label "Evalstats" -command {evalstats}
        $top.m.md add command -label "_stats" -command {parray _stats}
        $top.m.md add command -label "Nuisance" -command [list makeNuisance \
                $top "It looks like you are trying out the debug menu."]
        pack $top.md -in $top.f -side left -padx 20 -anchor n
    }

    initDiffData $top
    return $top
}

# Set new preferences.

    set Pref(bgnew2) \#e0e0ff
    set Pref(context) 0
    set Pref(marklast) 1
    set Pref(linewidth) 80
    set Pref(lines) 60
    set Pref(editor) ""
    set Pref(regsub) {}
    set Pref(toolbar) 0
    set Pref(ddtoolbar) 0
    
    # Print options
    set Pref(grayLevel1) 0.6
    set Pref(grayLevel2) 0.8
    set Pref(wideLines) 0

    # Directory diff options

    }

    # If the user's file has this old option, translate it to the new
    if {$Pref(onlydiffs) == 0} {
        set Pref(context) 0
    }
    unset Pref(onlydiffs)

    # Set up reactions to some Pref settings
    if {![info exists ::widgets(toolbars)]} {
        set ::widgets(toolbars) {}
    }
    if {![info exists ::widgets(ddtoolbars)]} {
        set ::widgets(ddtoolbars) {}
    }
    # FIXA: Move to procs, handle destroyed windows.
    trace add variable ::Pref(toolbar) write "
        foreach __ \$::widgets(toolbars) {
            if {\$::Pref(toolbar)} {
                grid configure \$__
            } else {
                grid remove \$__
            }
        }
    \# "
    trace add variable ::Pref(ddtoolbar) write "
        foreach __ \$::widgets(ddtoolbars) {
            if {\$::Pref(ddtoolbar)} {
                grid configure \$__
            } else {
                grid remove \$__
            }
        }
    \# "
}

# Global code is only run the first time to be able to reread source
if {![info exists gurkmeja]} {
    set gurkmeja 1
    package require pstools
    namespace import -force pstools::*
    getOptions
    if {![info exists ::eskil_testsuite]} {
        parseCommandLine
    }
}