Eskil

# 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}
    package require wcb
    package require snit
    package require tablelist_tile

    if {[catch {package require psballoon}]} {
        # Add a dummy if it does not exist.
        proc addBalloon {args} {}
    } else {
        namespace import -force psballoon::addBalloon
    }

    source $::eskil(thisDir)/dirdiff.tcl
    source $::eskil(thisDir)/help.tcl
    source $::eskil(thisDir)/plugin.tcl
    source $::eskil(thisDir)/printobj.tcl
    source $::eskil(thisDir)/print.tcl
    source $::eskil(thisDir)/rev.tcl



    # Diff functionality is in the DiffUtil package.
    package require DiffUtil
    # Help DiffUtil to find a diff executable, if needed
    catch {DiffUtil::LocateDiffExe $::eskil(thisScript)}

    # Figure out a place to store temporary files.
    locateTmp ::eskil(tmpdir)

    if {$::tcl_platform(platform) eq "windows"} {
        # Locate CVS if it is in c:/bin
        if {[auto_execok cvs] eq "" && [file exists "c:/bin/cvs.exe"]} {
            set ::env(PATH) "$::env(PATH);c:\\bin"
            auto_reset
        }

        }
    }

    interp alias {} toplevel {} ttk::toplevel

    # Use demo images from Tablelist
    set dir $::eskil(thisDir)/../lib/tablelist/demos
    if {[catch {
        set ::img(clsd) [image create photo -file [file join $dir clsdFolder.gif]]
        set ::img(open) [image create photo -file [file join $dir openFolder.gif]]
        set ::img(file) [image create photo -file [file join $dir file.gif]]
    }]} then {
        set ::img(clsd) ""
        set ::img(open) ""
        set ::img(file) ""
    }
    # Local images
    set dir $::eskil(thisDir)/images
    set ::img(link) [image create photo -file [file join $dir link.gif]]
    set ::img(left) [image create photo -file [file join $dir arrow_left.gif]]
    set ::img(right) [image create photo -file [file join $dir arrow_right.gif]]
    set ::img(browse) [image create photo -file [file join $dir folderopen1.gif]]
    set ::img(up) [image create photo -file [file join $dir arrow_up.gif]]

# If top = "all" it means quit.
# If eskil is embedded, this should be used to close an eskil toplevel.
proc cleanupAndExit {top} {
    # A security thing to make sure we can exit.
    set cont 0
    if {[catch {
        if {$top != "all"} {
            set i [lsearch $::eskil(diffWindows) $top]
            if {$i >= 0} {
                set ::eskil(diffWindows) [lreplace $::eskil(diffWindows) $i $i]
            }
            set i [lsearch $::widgets(toolbars) $top.f]
            if {$i >= 0} {
                set ::widgets(toolbars) [lreplace $::widgets(toolbars) $i $i]
            }

            destroy $top
            array unset ::eskil $top,*

            # Any windows remaining?
            if {[llength $::eskil(diffWindows)] > 0} {
                set cont 1
            }
        }
    } errMsg]} {
        tk_messageBox -icon error -title "Eskil Error" -message \
                "An error occured in the close process.\n$errMsg\n\
                (This is a bug)\nTerminating application." -type ok
    }
    if {$cont} return

    clearTmp
    exit
}

# If embedding, tell eskil about any other toplevel, then
# cleanupAndExit can be used to get rid of it.
proc eskilRegisterToplevel {top} {
    lappend ::eskil(diffWindows) $top
}

# Format a line number
proc myFormL {lineNo} {
    if {![string is integer -strict $lineNo]} {return "$lineNo\n"}
      return [format "%3d: \n" $lineNo]
}

# Get a name for a temporary file
# A tail can be given to make the file more recognisable.
proc tmpFile {{tail {}}} {
    if {[info exists ::tmpcnt]} {
        incr ::tmpcnt
    } else {
        set ::tmpcnt 0
    }
    set name "tmpd[pid]a$::tmpcnt"
    if {$tail ne ""} {
        append name " [file tail $tail]"
    }
    set name [file join $::eskil(tmpdir) $name]
    lappend ::tmpfiles $name
    return $name
}

# Delete temporary files
proc clearTmp {args} {
    if {![info exists ::tmpfiles]} {

# Insert one line in each text widget.
# Mark them as changed, and optionally parse them.
proc insertMatchingLines {top line1 line2} {
    global doingLine1 doingLine2 Pref

    # FIXA: fully implement filter
    if {$::eskil(filter) != ""} {
        if {[regexp $::eskil(filter) $line1]} {
            insertLine $top 1 $doingLine1 $line1
            insertLine $top 2 $doingLine2 $line2
            incr doingLine1
            incr doingLine2
            set ::eskil(filterflag) 1
            return
        }
        set ::eskil(filterflag) 0
    }

    if {$Pref(parse) != 0} {
        set opts $Pref(ignore)
        if {$Pref(nocase)} {lappend opts -nocase}
        if {$Pref(lineparsewords)} {lappend opts -words}
        set res [DiffUtil::diffStrings {*}$opts $line1 $line2]

    set apa [compareBlocks $block1 $block2]
    # Fine grained changes means that each line is considered its own
    # chunk. This is used for merging better to avoid the same decision
    # for an entire block.
    set finegrain [expr {$::Pref(finegrainchunks) && $details}]

    if {$finegrain && $::eskil($top,ancestorFile) ne ""} {
        # Avoid fine grain depending on relation to ancestor
        set leftChange 0
        set leftChangeOrAdd 0
        for {set t $line1} {$t < $line1 + $n1} {incr t} {
            if {[info exists ::eskil($top,ancestorLeft,$t)]} {
                set leftChangeOrAdd 1
                if {$::eskil($top,ancestorLeft,$t) eq "c"} {
                    set leftChange 1
                    break
                }
            }
        }
        set rightChange 0
        set rightChangeOrAdd 0
        for {set t $line2} {$t < $line2 + $n2} {incr t} {
            if {[info exists ::eskil($top,ancestorRight,$t)]} {
                set rightChangeOrAdd 1
                if {$::eskil($top,ancestorRight,$t) eq "c"} {
                    set rightChange 1
                    break
                }
            }
        }
        # Avoid fine grain if either side has no changes against ancestor
        if {!$leftChangeOrAdd || !$rightChangeOrAdd} {

        # All blocks have been processed. Continue until end of file.
        # If "show all" is not on, just display a couple of context lines.
        set limit -1
        if {$Pref(context) >= 0} {
            set limit $Pref(context)
        }
	# Consider any total limit on displayed lines.
        if {$::eskil($top,limitlines)} {
            set limit [expr {$::eskil($top,limitlines) - $::eskil($top,mapMax)}]
            if {$limit < 0} {
                set limit 0
            }
        }
        if {$limit >= 0} {disallowEdit $top}

        set t 0

                emptyLine $top 2 0
                addMapLines $top 1
            }
        }
        incr doingLine1
        incr doingLine2
        incr t
        if {$::eskil($top,limitlines) && \
                ($::eskil($top,mapMax) > $::eskil($top,limitlines))} {
            return
        }
    }
    # This should not happen unless something is wrong...
    if {$doingLine2 != $line2} {
        disallowEdit $top
        $::widgets($top,wDiff1) insert end \

        # If block parsing is turned off, only do line parsing for
        # blocks of equal size.
        for {set t 0} {$t < $n1} {incr t} {
            gets $ch1 textline1
            gets $ch2 textline2
            insertMatchingLines $top $textline1 $textline2
        }
        if {$::eskil(filter) != "" &&  $::eskil(filterflag)} {
            addMapLines $top $n1
        } else {
            addChange $top $n1 change $line1 $n1 $line2 $n2
            nextHighlight $top
        }
    } else {
        if {$n1 != 0 && $n2 != 0 && $Pref(parse) >= 2 && \

}

#####################################
# Special cases.  Conflict/patch
#####################################

proc startConflictDiff {top file} {
    set ::eskil($top,mode) "conflict"
    set ::eskil($top,modetype) ""
    set ::eskil($top,conflictFile) $file
    set ::eskil($top,rightDir) [file dirname $file]
    set ::eskil($top,rightOK) 1
    set ::eskil($top,rightLabel) $file
    set ::eskil($top,leftLabel) $file
    set ::eskil($top,leftOK) 0

    # Turn off ignore
    set ::Pref(ignore) " "
    set ::Pref(nocase) 0
    set ::Pref(noempty) 0

    # Try to autodetect line endings in file
    set ch [open $file rb]
    set data [read $ch 10000]
    close $ch
    if {[string first \r\n $data] >= 0} {
        set ::eskil($top,mergetranslation) crlf
    } else {
        set ::eskil($top,mergetranslation) lf
    }
}

# Read a conflict file and extract the two versions.
proc prepareConflict {top} {
    global Pref

    disallowEdit $top
    set ::eskil($top,leftFile) [tmpFile]
    set ::eskil($top,rightFile) [tmpFile]

    set ch1 [open $::eskil($top,leftFile) w]
    set ch2 [open $::eskil($top,rightFile) w]
    set ch [open $::eskil($top,conflictFile) r]

    set ::eskil($top,conflictDiff) {}
    set leftLine 1
    set rightLine 1
    set state both
    set rightName ""
    set leftName ""
    while {[gets $ch line] != -1} {
        if {[string match <<<<<<* $line]} {
            set state right
            regexp {<*\s*(.*)} $line -> rightName
            set start2 $rightLine
        } elseif {[string match ======* $line] && $state eq "right"} {
            set state left
            set end2 [expr {$rightLine - 1}]
            set start1 $leftLine
        } elseif {[string match >>>>>>* $line] && $state eq "left"} {
            set state both
            regexp {>*\s*(.*)} $line -> leftName
            set end1 [expr {$leftLine - 1}]
            lappend ::eskil($top,conflictDiff) [list \
                    $start1 [expr {$end1 - $start1 + 1}] \
                    $start2 [expr {$end2 - $start2 + 1}]]
        } elseif {$state eq "both"} {
            puts $ch1 $line
            puts $ch2 $line
            incr leftLine
            incr rightLine
        } elseif {$state eq "left"} {
            puts $ch1 $line
            incr leftLine
        } else {
            puts $ch2 $line
            incr rightLine
        }
    }
    close $ch
    close $ch1
    close $ch2

    if {$leftName eq "" && $rightName eq ""} {
        set leftName "No Conflict: [file tail $::eskil($top,conflictFile)]"
        set rightName $leftName
    }
    set ::eskil($top,leftLabel) $leftName
    set ::eskil($top,rightLabel) $rightName
    update idletasks
}

# Clean up after a conflict diff.
proc cleanupConflict {top} {
    global Pref

    clearTmp $::eskil($top,rightFile) $::eskil($top,leftFile)
    set ::eskil($top,rightFile) $::eskil($top,conflictFile)
    set ::eskil($top,leftFile) $::eskil($top,conflictFile)
}

# Display one chunk from a patch file
proc displayOnePatch {top leftLines rightLines leftLine rightLine} {
    emptyLine $top 1
    emptyLine $top 2

    }
}

# Read a patch file and display it
proc displayPatch {top} {
    global Pref

    set ::eskil($top,leftLabel) "Patch $::eskil($top,patchFile): old"
    set ::eskil($top,rightLabel) "Patch $::eskil($top,patchFile): new"
    update idletasks

    if {$::eskil($top,patchFile) eq ""} {
        if {$::eskil($top,patchData) eq ""} {
            set data [getFullPatch $top]
        } else {
            set data $::eskil($top,patchData)
        }
    } elseif {$::eskil($top,patchFile) eq "-"} {
        set data [read stdin]
    } else {
        set ch [open $::eskil($top,patchFile) r]
        set data [read $ch]
        close $ch
    }

    set style ""
    set divider "-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-"

#####################################
# Main diff
#####################################

# Prepare for a diff by creating needed temporary files
proc prepareFiles {top} {
    set ::eskil($top,cleanup) {}
    if {$::eskil($top,mode) eq "rev"} {
        prepareRev $top
        lappend ::eskil($top,cleanup) "rev"
    } elseif {$::eskil($top,mode) eq "conflict"} {
        prepareConflict $top
        lappend ::eskil($top,cleanup) "conflict"
    }
    if {$::eskil($top,plugin) ne ""} {
        preparePlugin $top
        set ::eskil($top,cleanup) "plugin $::eskil($top,cleanup)"
    }
}

# Clean up after a diff
proc cleanupFiles {top} {
    foreach keyword $::eskil($top,cleanup) {
        switch $keyword {
            "rev"      {cleanupRev      $top}
            "conflict" {cleanupConflict $top}
            "plugin"   {cleanupPlugin   $top}
        }
    }
    set ::eskil($top,cleanup) {}
}

# Redo Diff command
proc redoDiff {top} {
    # Note what rows are being displayed
    set w $::widgets($top,wDiff1)

        set w $::widgets($top,$item)
        seeText $w $first.0 $last.0
    }
}

# Make an appropriate tail for a window title, depending on mode and files.
proc TitleTail {top} {
    set tail1 [file tail $::eskil($top,rightLabel)]
    set tail2 [file tail $::eskil($top,leftLabel)]
    if {$::eskil($top,mode) ne "" || $tail1 eq $tail2} {
        if {$::eskil($top,mode) eq "rev"} {
            set tail1 [file tail $::eskil($top,RevFile)]
        } elseif {$::eskil($top,mode) eq "conflict"} {
            set tail1 [file tail $::eskil($top,conflictFile)]
        }
        return $tail1
    } else {
        return "$tail2 vs $tail1"
    }
}

# Main diff function.
proc doDiff {top} {
    global Pref
    global doingLine1 doingLine2

    if {$::eskil($top,mode) eq "" && ($::eskil($top,leftOK) == 0 || $::eskil($top,rightOK) == 0)} {
        disableRedo $top
        return
    } else {
        enableRedo $top
    }

    busyCursor $top

    # Display a star during diff execution, to know when the internal
    # processing starts, and when the label is "valid".
    set ::widgets($top,eqLabel) "*"

    wm title $top "Eskil:"
    update idletasks

    if {$::eskil($top,mode) eq "patch"} {
        disallowEdit $top
        displayPatch $top
        drawMap $top -1
        foreach item {wLine1 wLine2} {
            set w $::widgets($top,$item)
            $w configure -state disabled
        }
        update idletasks
        wm title $top "Eskil: [file tail $::eskil($top,patchFile)]"
        $::widgets($top,wLine2) see 1.0
        normalCursor $top
        return
    } else {
        prepareFiles $top
    }

    wm title $top "Eskil: [TitleTail $top]"

    # Run diff and parse the result.
    set opts $Pref(ignore)
    if {$Pref(nocase)} {lappend opts -nocase}
    if {$Pref(noempty)} {lappend opts -noempty}
    if {[info exists ::eskil($top,aligns)] && \
            [llength $::eskil($top,aligns)] > 0} {
        lappend opts -align $::eskil($top,aligns)
    }
    set range {}
    if {[info exists ::eskil($top,range)] && \
            [llength $::eskil($top,range)] == 4} {
        set range $::eskil($top,range)
        lappend opts -range $range
    }
    if {[llength $Pref(regsub)] > 0} {
        lappend opts -regsub $Pref(regsub)
    }
    # Apply nodigit after preprocess
    if {$Pref(nodigit)} {lappend opts -nodigit}

    # If a special file for diffing is present, use it.
    if {[info exists ::eskil($top,leftFileDiff)]} {
        set dFile1 $::eskil($top,leftFileDiff)
    } else {
        set dFile1 $::eskil($top,leftFile)
    }
    if {[info exists ::eskil($top,rightFileDiff)]} {
        set dFile2 $::eskil($top,rightFileDiff)
    } else {
        set dFile2 $::eskil($top,rightFile)
    }

    set differr [catch {DiffUtil::diffFiles {*}$opts \
            $dFile1 $dFile2} diffres]

    # In conflict mode we can use the diff information collected when
    # parsing the conflict file. This makes sure the blocks in the conflict
    # file become change-blocks during merge.
    if {$::eskil($top,mode) eq "conflict" && $::eskil($top,modetype) eq "Pure"} {
        set diffres $::eskil($top,conflictDiff)
    }

    if {$differr != 0} {
        $::widgets($top,wDiff1) insert end $diffres
        normalCursor $top
        return
    }
    if {[llength $diffres] == 0} {
        set ::widgets($top,eqLabel) "="
        # Automatically close if equal
        if {$::eskil(autoclose)} {
            after idle cleanupAndExit $top
            return
        }
    } else {
        set ::widgets($top,eqLabel) " "
    }
    # Update the equal label immediately for better feedback
    update idletasks

    if {$::eskil($top,ancestorFile) ne ""} {
        collectAncestorInfo $top $dFile1 $dFile2 $opts
    }

    set firstview 1

    set ch1 [open $::eskil($top,leftFile)]
    set ch2 [open $::eskil($top,rightFile)]
    set doingLine1 1
    set doingLine2 1

    # If there is a range, skip lines up to the range
    if {[llength $range] != 0} {
        disallowEdit $top
        lassign $range start1 end1 start2 end2
        while {$doingLine1 < $start1 && [gets $ch1 line] >= 0} {
            incr doingLine1
        }
        while {$doingLine2 < $start2 && [gets $ch2 line] >= 0} {
            incr doingLine2
        }
    }

    set t 0
    foreach i $diffres {
        lassign $i line1 n1 line2 n2
        doText $top $ch1 $ch2 $n1 $n2 $line1 $line2
        if {$::eskil($top,limitlines) && \
                ($::eskil($top,mapMax) > $::eskil($top,limitlines))} {
            break
        }

        # Get one update when the screen has been filled.
        # Show the first diff.
        if {$firstview && $::eskil($top,mapMax) > 100} {
            set firstview 0
            showDiff $top 0
            update idletasks
        }
    }

    # If there is a range, just display the range

    close $ch2

    # We can turn off editing in the text windows after everything
    # is displayed.
    noEdit $top

    # Mark aligned lines
    if {[info exists ::eskil($top,aligns)] && \
            [llength $::eskil($top,aligns)] > 0} {
        foreach {align1 align2} $::eskil($top,aligns) {
            set i [$::widgets($top,wLine1) search -regexp "\\m$align1\\M" 1.0]
            if {$i != ""} {
                $::widgets($top,wLine1) tag add align \
                        "$i linestart" "$i lineend"
            }
            set i [$::widgets($top,wLine2) search -regexp "\\m$align2\\M" 1.0]
            if {$i != ""} {

    normalCursor $top
    showDiff $top 0
    if {$::widgets($top,eqLabel) eq "!"} {
        set ::widgets($top,eqLabel) " "
    }

    cleanupFiles $top
    if {$::eskil($top,mode) eq "conflict"} {
        if {$::widgets($top,eqLabel) != "="} {
            makeMergeWin $top
        }
    } elseif {$::eskil($top,ancestorFile) ne ""} {
        if {$::widgets($top,eqLabel) != "="} {
            makeMergeWin $top
        }
    }
    if {$::eskil($top,printFile) ne ""} {
        after idle "doPrint $top 1 ; cleanupAndExit all"
    }
}

# This is the entrypoint to do a diff via DDE or Send
proc remoteDiff {file1 file2} {
    newDiff $file1 $file2
}

#####################################
# Highlight and navigation stuff
#####################################

# Scroll windows to next/previous diff
proc findDiff {top delta} {
    showDiff $top [expr {$::eskil($top,currHighLight) + $delta}]
}

# Scroll a text window to view a certain range, and possibly some
# lines before and after.
proc seeText {w si ei} {
    $w see $ei
    $w see $si
    $w see $si-5lines
    $w see $ei+5lines
    if {[llength [$w bbox $si]] == 0} {
        $w yview $si-5lines
    }
    if {[llength [$w bbox $ei]] == 0} {
        $w yview $si
    }
}

# Highlight a diff
proc highLightChange {top n} {
    if {[info exists ::eskil($top,currHighLight)] && \
            $::eskil($top,currHighLight) >= 0} {
        $::widgets($top,wLine1) tag configure hl$::eskil($top,currHighLight) \
                -background {}
        $::widgets($top,wLine2) tag configure hl$::eskil($top,currHighLight) \
                -background {}
    }
    set ::eskil($top,currHighLight) $n
    if {$::eskil($top,currHighLight) < 0} {
        set ::eskil($top,currHighLight) -1
    } elseif {$::eskil($top,currHighLight) >= [llength $::eskil($top,changes)]} {
        set ::eskil($top,currHighLight) [llength $::eskil($top,changes)]
    } else {
        $::widgets($top,wLine1) tag configure hl$::eskil($top,currHighLight) \
                -background yellow
        $::widgets($top,wLine2) tag configure hl$::eskil($top,currHighLight) \
                -background yellow
    }
}

# Highlight a diff and scroll windows to it.
proc showDiff {top num} {
    highLightChange $top $num

    set change [lindex $::eskil($top,changes) $::eskil($top,currHighLight)]
    set line1 [lindex $change 0]

    if {$::eskil($top,currHighLight) < 0} {
        set line1 1.0
        set line2 1.0
    } elseif {$line1 eq ""} {
        set line1 end
        set line2 end
    } else {
        set line2 [expr {$line1 + [lindex $change 1]}]

#####################################

# FIXA: Use snit to adapt text widget instead of using wcb
# include seeText in such a snidget.

# Clear Editing state
proc resetEdit {top} {
    set ::eskil($top,leftEdit) 0
    set ::eskil($top,rightEdit) 0
    $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 tag configure padding -background {}
    $w edit reset
    $w configure -undo 0

    set ::eskil($w,allowChange) all

    wcb::callback $w before insert {}
    wcb::callback $w before delete {}
}

# Do not allow any editing
proc noEdit {top} {
    noEditW $::widgets($top,wDiff1)
    noEditW $::widgets($top,wDiff2)
}

# Do not allow any editing in a Text widget
proc noEditW {w} {
    set ::eskil($w,allowChange) none

    wcb::callback $w before insert [list TextInterceptInsert $w]
    wcb::callback $w before delete [list TextInterceptDelete $w]
}

proc TextInterceptInsert {w ow index str args} {
    if {$::eskil($w,allowChange) eq "none"} {
        wcb::cancel
        return
    }
    if {$::eskil($w,allowChange) eq "all"} return

    #wcb::cancel - Cancel a widget command
    #wcb::replace - Replace arguments of a widget command with new ones

    # Disallow all new lines
    if {[string first "\n" $str] >= 0} {
        wcb::cancel
        return
    }
    foreach {tag str2} $args {
        if {[string first "\n" $str2] >= 0} {
            wcb::cancel
            return
        }
    }
}

proc TextInterceptDelete {w ow from {to {}}} {
    if {$::eskil($w,allowChange) eq "none"} {
        wcb::cancel
        return
    }
    if {$::eskil($w,allowChange) eq "all"} return

    if {$to eq ""} {
        set to $from+1char
    }
    set text [$ow get $from $to]
    # Disallow all new lines
    if {[string first "\n" $text] >= 0} {
        wcb::cancel
        return
    }
}

# Turn on editing for a Text widget
proc turnOnEdit {w} {
    $w tag configure padding -background \#f0f0f0
    $w configure -undo 1

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

# Turn on editing on sides where it has not been disallowed
proc allowEdit {top} {
    $top.m.mt entryconfigure "Edit Mode" -state disable
    if {$::eskil($top,leftEdit) == 0} {
        set ::eskil($top,leftEdit) 1
        turnOnEdit $::widgets($top,wDiff1)
    }
    if {$::eskil($top,rightEdit) == 0} {
        set ::eskil($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 || $side == 1} {
        set ::eskil($top,leftEdit) -1
    }
    if {$side == 0 || $side == 2} {
        set ::eskil($top,rightEdit) -1
    }
    if {$::eskil($top,leftEdit) == -1 && $::eskil($top,rightEdit) == -1} {
        $top.m.mt entryconfigure "Edit Mode" -state disabled
    }
}

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

# Start an undo block in a bunch of text widgets
proc startUndoBlock {args} {
    foreach w $args {
        $w configure -autoseparators 0
        # Open up editing for copy functions
        set ::eskil($w,allowChange) all
    }
}

# End an undo block in a bunch of text widgets
proc endUndoBlock {args} {
    foreach w $args {
        $w configure -autoseparators 1
        $w edit separator
        set ::eskil($w,allowChange) line
    }
}

# Copy a block
proc copyBlock {top from first last} {
    set to [expr {3 - $from}]

    $m add command -label "Save File" -command [list saveFile $top $n]

    return 0
}

proc saveFile {top side} {
    if {$side == 1} {
        if {!$::eskil($top,leftEdit)} return
        set fileName $::eskil($top,leftFile)
    } else {
        if {!$::eskil($top,rightEdit)} return
        set fileName $::eskil($top,rightFile)
    }

    set w $::widgets($top,wDiff$side)

    # Confirm dialog
    set apa [tk_messageBox -parent $top -icon question \
            -title "Overwrite file" -type yesnocancel -message \

    return [file isdirectory $file]
}

# A wrapper for tk_getOpenFile
proc myOpenFile {args} {
    # When in tutorial mode, make sure the Tcl file dialog is used
    # to be able to access the files in a starkit.
    if {[info exists ::eskil(tutorial)] && $::eskil(tutorial)} {
        # Only do this if tk_getOpenFile is not a proc.
        if {[info procs tk_getOpenFile] eq ""} {
            # If there is any problem, call the real one
            if {![catch {set res [::tk::dialog::file:: open {*}$args]}]} {
                return $res
            }
        }
    }
    return [tk_getOpenFile {*}$args]
}

proc doOpenLeft {top {forget 0}} {
    if {!$forget && [info exists ::eskil($top,leftDir)]} {
        set initDir $::eskil($top,leftDir)
    } elseif {[info exists ::eskil($top,rightDir)]} {
        set initDir $::eskil($top,rightDir)
    } else {
        set initDir [pwd]
    }

    set apa [myOpenFile -title "Select left file" -initialdir $initDir \
            -parent $top]
    if {$apa != ""} {
        set ::eskil($top,leftDir) [file dirname $apa]
        set ::eskil($top,leftFile) $apa
        set ::eskil($top,leftLabel) $apa
        set ::eskil($top,leftOK) 1
        return 1
    }
    return 0
}

proc doOpenRight {top {forget 0}} {
    if {!$forget && [info exists ::eskil($top,rightDir)]} {
        set initDir $::eskil($top,rightDir)
    } elseif {[info exists ::eskil($top,leftDir)]} {
        set initDir $::eskil($top,leftDir)
    } else {
        set initDir [pwd]
    }

    set apa [myOpenFile -title "Select right file" -initialdir $initDir \
            -parent $top]
    if {$apa != ""} {
        set ::eskil($top,rightDir) [file dirname $apa]
        set ::eskil($top,rightFile) $apa
        set ::eskil($top,rightLabel) $apa
        set ::eskil($top,rightOK) 1
        return 1
    }
    return 0
}

proc doOpenAncestor {top} {
    if {$::eskil($top,ancestorFile) ne ""} {
        set initDir [file dirname $::eskil($top,ancestorFile)]
    } elseif {[info exists ::eskil($top,leftDir)]} {
        set initDir $::eskil($top,leftDir)
    } elseif {[info exists ::eskil($top,rightDir)]} {
        set initDir $::eskil($top,rightDir)
    } else {
        set initDir [pwd]
    }
    set apa [myOpenFile -title "Select ancestor file" -initialdir $initDir \
            -parent $top]
    if {$apa != ""} {
        set ::eskil($top,ancestorFile) $apa
        return 1
    }
    return 0
}

proc openLeft {top} {
    if {[doOpenLeft $top]} {
        set ::eskil($top,mode) ""
        set ::eskil($top,mergeFile) ""
        doDiff $top
    }
}

proc openRight {top} {
    if {[doOpenRight $top]} {
        set ::eskil($top,mode) ""
        set ::eskil($top,mergeFile) ""
        doDiff $top
    }
}

proc openAncestor {top} {
    if {[doOpenAncestor $top]} {
        # Redo diff with ancestor
        doDiff $top
    }
}

proc openConflict {top} {
    global Pref
    if {[doOpenRight $top]} {
        startConflictDiff $top $::eskil($top,rightFile)
        set ::eskil($top,mergeFile) ""
        doDiff $top
    }
}

proc openPatch {top} {
    global Pref
    if {[doOpenLeft $top]} {
        set ::eskil($top,mode) "patch"
        set Pref(ignore) " "
        set Pref(nocase) 0
        set Pref(noempty) 0 
        set ::eskil($top,patchFile) $::eskil($top,leftFile)
        set ::eskil($top,patchData) ""
        doDiff $top
    }
}

# Get data from clipboard and display as a patch.
proc doPastePatch {top} {
    if {[catch {::tk::GetSelection $top CLIPBOARD} sel]} {
        tk_messageBox -icon error -title "Eskil Error" -parent $top \
                -message "Could not retreive clipboard" -type ok
        return
    }
    set ::eskil($top,mode) "patch"
    set ::Pref(ignore) " "
    set ::Pref(nocase) 0
    set ::Pref(noempty) 0 
    set ::eskil($top,patchFile) ""
    set ::eskil($top,patchData) $sel
    doDiff $top
}

proc openRev {top} {
    if {[doOpenRight $top]} {
        set rev [detectRevSystem $::eskil($top,rightFile)]
        if {$rev eq ""} {
            tk_messageBox -icon error -title "Eskil Error" -message \
                    "Could not figure out which revison control system\
                    \"$::eskil($top,rightFile)\" is under." -type ok
            return
        }
        startRevMode $top $rev $::eskil($top,rightFile)
        set ::eskil($top,mergeFile) ""
        doDiff $top
    }
}

proc openBoth {top forget} {
    if {[doOpenLeft $top]} {
        if {[doOpenRight $top $forget]} {
            set ::eskil($top,mode) ""
            set ::eskil($top,mergeFile) ""
            doDiff $top
        }
    }
}

# File drop using TkDnd
proc fileDrop {top side files} {
    # FIXA: Maybe single drop during rev mode should stay in rev mode?
    # Dropping two files mean set both
    if {[llength $files] >= 2} {
        set leftFile [lindex $files 0]
        set rightFile [lindex $files 1]
    } elseif {$side eq "left"} {
        set leftFile [lindex $files 0]
        set rightFile ""
    } else {
        set leftFile ""
        set rightFile [lindex $files 0]
    }
    if {$leftFile ne ""} {
        set ::eskil($top,leftDir) [file dirname $leftFile]
        set ::eskil($top,leftFile) $leftFile
        set ::eskil($top,leftLabel) $leftFile
        set ::eskil($top,leftOK) 1
        set ::eskil($top,mode) ""
        set ::eskil($top,mergeFile) ""
    }
    if {$rightFile ne ""} {
        set ::eskil($top,rightDir) [file dirname $rightFile]
        set ::eskil($top,rightFile) $rightFile
        set ::eskil($top,rightLabel) $rightFile
        set ::eskil($top,rightOK) 1
        set ::eskil($top,mode) ""
        set ::eskil($top,mergeFile) ""
    }
    if {$::eskil($top,leftOK) && $::eskil($top,rightOK)} {
        doDiff $top
    }
}

#####################################
# GUI stuff
#####################################

proc disableAlign {top} {
    eval $::widgets($top,disableAlignCmd)
}

# Remove one or all alignment pairs
proc clearAlign {top {leftline {}}} {
    if {$leftline == ""} {
        set ::eskil($top,aligns) {}
    } else {
        set i 0
        while 1 {
            set i [lsearch -integer -start $i $::eskil($top,aligns) $leftline]
            if {$i < 0} break
            if {($i % 2) == 0} {
                set ::eskil($top,aligns) [lreplace $::eskil($top,aligns) \
                        $i [+ $i 1]]
                break
            }
            incr i
        }
    }

    if {[llength $::eskil($top,aligns)] == 0} {
        disableAlign $top
    }
}

proc NoMarkAlign {top} {
    unset -nocomplain ::eskil($top,align1)
    unset -nocomplain ::eskil($top,align2)
    unset -nocomplain ::eskil($top,aligntext1)
    unset -nocomplain ::eskil($top,aligntext2)
}

# Mark a line as aligned.
proc markAlign {top n line text} {
    set ::eskil($top,align$n) $line
    set ::eskil($top,aligntext$n) $text

    if {[info exists ::eskil($top,align1)] && [info exists ::eskil($top,align2)]} {
        if {![string equal $::eskil($top,aligntext1) $::eskil($top,aligntext2)]} {
            set apa [tk_messageBox -icon question -title "Align" -type yesno \
                    -message "Those lines are not equal.\nReally align them?"]
            if {$apa != "yes"} {
                return 0
            }
        }

        lappend ::eskil($top,aligns) $::eskil($top,align1) $::eskil($top,align2)
        enableAlign $top

        NoMarkAlign $top
        return 1
    }
    return 0
}

    if {![regexp {\d+} $data line]} {
        return 1
    }
    set text [$::widgets($top,wDiff$n) get $row.0 $row.end]

    set other [expr {$n == 1 ? 2 : 1}]
    set cmd [list markAlign $top $n $line $text]
    if {![info exists ::eskil($top,align$other)]} {
        set label "Mark line for alignment"
    } else {
        set label "Align with line $::eskil($top,align$other) on other side"
    }

    if {[info exists ::eskil($top,aligns)]} {
        foreach {align1 align2} $::eskil($top,aligns) {
            if {$n == 1 && $line == $align1} {
                set label "Remove alignment with line $align2"
                set cmd [list clearAlign $top $align1]
            } elseif {$n == 2 && $line == $align2} {
                set label "Remove alignment with line $align1"
                set cmd [list clearAlign $top $align1]
            }

proc startAlignDrag {top n x y X Y} {
    # Get the row that was clicked
    set w $::widgets($top,wLine$n)
    set index [$w index @$x,$y]
    set row [lindex [split $index "."] 0]

    set data [$w get $row.0 $row.end]
    set ::eskil($top,alignDrag,state) none
    # Must be a line number
    if {![regexp {\d+} $data line]} {
        return 1
    }
    # Set up information about start of drag
    set text [$::widgets($top,wDiff$n) get $row.0 $row.end]
    set other [expr {$n == 1 ? 2 : 1}]
    set ::eskil($top,alignDrag,X) $X
    set ::eskil($top,alignDrag,Y) $Y
    set ::eskil($top,alignDrag,from) $n
    set ::eskil($top,alignDrag,line$n) $line
    set ::eskil($top,alignDrag,text$n) $text
    set ::eskil($top,alignDrag,line$other) "?"
    set ::eskil($top,alignDrag,state) press
}

# Mouse moves with button down
proc motionAlignDrag {top n shift x y X Y} {
    if {$::eskil($top,alignDrag,state) eq "press"} {
        # Have we moved enough to call it dragging?
        set dX [expr {abs($X - $::eskil($top,alignDrag,X))}]
        set dY [expr {abs($Y - $::eskil($top,alignDrag,Y))}]
        if {$dX + $dY > 3} {
            # Start a drag action
            set w $top.alignDrag
            destroy $w
            toplevel $w
            wm overrideredirect $w 1
            label $w.l -borderwidth 1 -relief solid -justify left
            pack $w.l
            set ::eskil($top,alignDrag,W) $w
            set ::eskil($top,alignDrag,state) "drag"
        }
    }
    if {$::eskil($top,alignDrag,state) eq "drag"} {
        set w $::eskil($top,alignDrag,W)
        # Move drag label with cursor
        wm geometry $w +[expr {$X + 1}]+[expr {$Y + 1}]
        
        set n $::eskil($top,alignDrag,from)
        set other [expr {$n == 1 ? 2 : 1}]
        set w2 $::widgets($top,wLine$other)
        # Are we over the other line window?
        if {[winfo containing $X $Y] eq $w2} {
            set x [expr {$X - [winfo rootx $w2]}]
            set y [expr {$Y - [winfo rooty $w2]}]
            set index [$w2 index @$x,$y]
            set row [lindex [split $index "."] 0]
            set data [$w2 get $row.0 $row.end]
            if {![regexp {\d+} $data line]} {
                set ::eskil($top,alignDrag,line$other) "?"
            } else {
                set ::eskil($top,alignDrag,line$other) $line
                set text [$::widgets($top,wDiff$other) get $row.0 $row.end]
                set ::eskil($top,alignDrag,text$other) $text
            }
        } else {
            set ::eskil($top,alignDrag,line$other) "?"
        }
        set txt "Align Left $::eskil($top,alignDrag,line1)"
        append txt "\nwith Right $::eskil($top,alignDrag,line2)"
        set ::eskil($top,alignDrag,shift) $shift
        if {$shift} {
            append txt "\nAnd Redo Diff"
        }
        $w.l configure -text $txt
    }
}

# Button has been released
proc endAlignDrag {top n x y X Y} {
    if {$::eskil($top,alignDrag,state) eq "drag"} {
        destroy $::eskil($top,alignDrag,W)
        # Are both line numbers valid? I.e. is this a full align operation?
        if {$::eskil($top,alignDrag,line1) ne "?" && \
                $::eskil($top,alignDrag,line2) ne "?"} {
            NoMarkAlign $top
            markAlign $top 1 $::eskil($top,alignDrag,line1) \
                    $::eskil($top,alignDrag,text1)
            set marked [markAlign $top 2 $::eskil($top,alignDrag,line2) \
                    $::eskil($top,alignDrag,text2)]
            if {$::eskil($top,alignDrag,shift) && $marked} {
                redoDiff $top
            }
        }
    }
    set ::eskil($top,alignDrag,state) none
}

###################
# Diff highlighting
###################

proc hlSelect {top hl} {
    highLightChange $top $hl
}

proc hlSeparate {top n hl} {
    set ::eskil($top,separate$n) $hl
    set wd $::widgets($top,wDiff$n)
    set wl $::widgets($top,wLine$n)

    if {$hl eq ""} {
        set range [$wd tag ranges sel]
    } else {
        set range [$wl tag ranges hl$::eskil($top,separate$n)]
    }
    set text [$wd get {*}$range]
    set ::eskil($top,separatetext$n) $text

    # Get the lines involved in the display
    set from [lindex $range 0]
    set to   [lindex $range 1]
    lassign [split $from "."] froml fromi
    lassign [split $to   "."] tol   toi
    if {$toi == 0} {incr tol -1}
    # Get the corresponding lines in the file
    set t [$wl get $froml.0 $tol.end]
    set lines [lsort -integer [regexp -all -inline {\d+} $t]]
    set froml [lindex $lines 0]
    set tol [lindex $lines end]
    set ::eskil($top,separatelines$n) [list $froml $tol]

    if {[info exists ::eskil($top,separate1)] && \
            [info exists ::eskil($top,separate2)]} {
        if {1} {
            cloneDiff $top [concat $::eskil($top,separatelines1) \
                    $::eskil($top,separatelines2)]
        } else {
            set f1 [tmpFile]
            set f2 [tmpFile]
            set ch [open $f1 w]
            puts $ch $::eskil($top,separatetext1)
            close $ch
            set ch [open $f2 w]
            puts $ch $::eskil($top,separatetext2)
            close $ch

            newDiff $f1 $f2
        }
        unset ::eskil($top,separate1)
        unset ::eskil($top,separate2)
    }
}

proc hlPopup {top n hl X Y x y} {
    if {[info exists ::eskil($top,nopopup)] && $::eskil($top,nopopup)} return
    destroy .lpm
    menu .lpm

    if {![editMenu .lpm $top $n $hl $x $y]} {
        .lpm add separator
    }

    if {$hl != ""} {
        .lpm add command -label "Select" \
                -command [list hlSelect $top $hl]
    }

    set other [expr {$n == 1 ? 2 : 1}]
    if {![info exists ::eskil($top,separate$other)]} {
        set label "Mark for Separate Diff"
    } else {
        set label "Separate Diff"
    }

    .lpm add command -label $label -command [list hlSeparate $top $n $hl]
    alignMenu .lpm $top $n $x $y

    set ::eskil($top,nopopup) 1
    tk_popup .lpm $X $Y
    after idle [list after 1 [list set ::eskil($top,nopopup) 0]]

    return
}

# This is called when right clicking over the line numbers which are not
# marked for changes
proc rowPopup {w X Y x y} {
    set top [winfo toplevel $w]
    if {[info exists ::eskil($top,nopopup)] && $::eskil($top,nopopup)} return
    destroy .lpm
    menu .lpm

    regexp {(\d+)\D*$} $w -> n
    set tmp1 [editMenu  .lpm $top $n "" $x $y]
    if {!$tmp1} {.lpm add separator}
    set tmp2 [alignMenu .lpm $top $n $x $y]
    if {$tmp1 && $tmp2} {
        # Nothing in the menu
        return
    }
    if {!$tmp1 && $tmp2} {.lpm delete last}

    set ::eskil($top,nopopup) 1
    tk_popup .lpm $X $Y
    after idle [list after 1 [list set ::eskil($top,nopopup) 0]]
}

proc nextHighlight {top} {
    set tag hl$::HighLightCount
    foreach n {1 2} {
        $::widgets($top,wLine$n) tag bind $tag <ButtonPress-3> \
                "hlPopup $top $n $::HighLightCount %X %Y %x %y ; break"

    font configure myfont -size $Pref(fontsize) -family $Pref(fontfamily)
}

# Change color settings
proc applyColor {} {
    global dirdiff Pref

    foreach top $::eskil(diffWindows) {
        if {$top eq ".clipdiff"} continue
        if {$top != ".dirdiff"} {
            foreach item {wLine1 wDiff1 wLine2 wDiff2} {
                if {![info exists ::widgets($top,$item)]} continue
                set w $::widgets($top,$item)

                $w tag configure equal -foreground $Pref(colorequal) \

	uplevel \#0 "trace variable $var w \
		{after idle {$w xview end} ;#}"
    }
}

# Fill in default data for a diff window
proc initDiffData {top} {
    set ::eskil($top,leftOK) 0
    set ::eskil($top,rightOK) 0
    set ::eskil($top,mode) ""
    set ::eskil($top,printFile) ""
    set ::eskil($top,mergeFile) ""
    set ::eskil($top,ancestorFile) ""
    set ::eskil($top,conflictFile) ""
    set ::eskil($top,limitlines) 0
    set ::eskil($top,plugin) ""
}

# Create a new diff window and diff two files
proc newDiff {file1 file2 {range {}}} {
    set top [makeDiffWin]
    update

    set ::eskil($top,leftDir) [file dirname $file1]
    set ::eskil($top,leftFile) $file1
    set ::eskil($top,leftLabel) $file1
    set ::eskil($top,leftOK) 1
    set ::eskil($top,rightDir) [file dirname $file2]
    set ::eskil($top,rightFile) $file2
    set ::eskil($top,rightLabel) $file2
    set ::eskil($top,rightOK) 1
    set ::eskil($top,mode) ""
    set ::eskil($top,range) $range
    wm deiconify $top
    raise $top
    update
    doDiff $top
    return $top
}


# Create a new diff window equal to another, except for possibly a range
proc cloneDiff {other {range {}}} {
    set top [makeDiffWin]
    update

    foreach item [array names ::diff $other,*] {
        regsub {^[^,]*,} $item {} item
        set ::eskil($top,$item) $::eskil($other,$item)
    }
    if {[llength $range] != 0} {
        set ::eskil($top,range) $range
    }
    wm deiconify $top
    raise $top
    update
    doDiff $top
}

    global Pref tcl_platform

    if {$top != "" && [winfo exists $top] && [winfo toplevel $top] eq $top} {
        # Reuse the old window
        destroy {*}[winfo children $top]
    } else {
        # Locate a free toplevel name
        if {[info exists ::eskil(topDiffCnt)]} {
            set t $::eskil(topDiffCnt)
        } else {
            set t 0
        }
        while {[winfo exists .diff$t]} {
            incr t
        }
        set top .diff$t

                -command [list makeDocWin $file] -underline 0
    }
    $top.m.help add separator
    $top.m.help add command -label "About" -command makeAboutWin -underline 0

    ttk::label $top.lr1 -text "Rev 1"
    addBalloon $top.lr1 "Revision number for version diff."
    ttk::entryX $top.er1 -width 12 -textvariable ::eskil($top,doptrev1)
    set ::widgets($top,rev1) $top.er1
    bind $top.er1 <Key-Return> [list redoDiff $top]

    ttk::label $top.lr2 -text "Rev 2"
    addBalloon $top.lr2 "Revision number for version diff."
    ttk::entryX $top.er2 -width 12 -textvariable ::eskil($top,doptrev2)
    set ::widgets($top,rev2) $top.er2
    bind $top.er2 <Key-Return> [list redoDiff $top]

    ttk::button $top.bcm -text Commit -command [list revCommit $top] \
            -state disabled -underline 0
    set ::widgets($top,commit) $top.bcm
    ttk::button $top.blg -text Log -command [list revLog $top] \

    bind $top <Alt-p> [list findDiff $top -1]
    bind $top <Alt-c> [list revCommit $top]
    bind $top <Alt-l> [list revLog $top]

    catch {font delete myfont}
    font create myfont -family $Pref(fontfamily) -size $Pref(fontsize)

    fileLabel $top.l1 -textvariable ::eskil($top,leftLabel)
    fileLabel $top.l2 -textvariable ::eskil($top,rightLabel)

    ttk::frame $top.ft1 -borderwidth 2 -relief sunken
    text $top.ft1.tl -height $Pref(lines) -width 5 -wrap none \
            -font myfont -borderwidth 0 -padx 0 -highlightthickness 0 \
            -takefocus 0
    text $top.ft1.tt -height $Pref(lines) -width $Pref(linewidth) -wrap none \
            -xscrollcommand [list $top.sbx1 set] \

            $top.m.md add separator
        }
        $top.m.md add checkbutton -label "Wrap" -variable wrapstate \
                -onvalue char -offvalue none -command \
                "$top.ft1.tt configure -wrap \$wrapstate ;\
                $top.ft2.tt configure -wrap \$wrapstate"
        $top.m.md add command -label "Date Filter" \
                -command {set ::eskil(filter) {^Date}}
        $top.m.md add separator
        $top.m.md add command -label "Reread Source" -underline 0 \
                -command {EskilRereadSource}
        $top.m.md add separator
        $top.m.md add command -label "Redraw Window" \
                -command [list makeDiffWin $top]
        $top.m.md add separator

        font configure tmpfont -size $TmpPref(fontsize)
    }
}

proc UpdateFontBox {lb} {
    $lb delete 0 end
    foreach {f fixed} $::FontCache {
        if {$fixed || !$::eskil(fixedfont)} {
            $lb insert end $f
            if {[string equal -nocase $f $::Pref(fontfamily)]} {
                $lb selection set end
                $lb see end
            }
        }
    }

    ttk::labelframe .fo.ls -text "Size" -padding 3
    spinbox .fo.ls.sp -from 1 -to 30 -increment 1 -width 3 -state readonly \
            -textvariable TmpPref(fontsize) -command [list exampleFont $lb]
    pack .fo.ls.sp -fill both -expand 1

    ttk::label .fo.le -text "Example\n0Ooi1Il" -anchor w -font tmpfont \
            -width 1 -justify left
    if {![info exists ::eskil(fixedfont)]} {set ::eskil(fixedfont) 1}
    ttk::checkbutton .fo.cb -text "Fixed" -variable ::eskil(fixedfont) \
            -command [list UpdateFontBox $lb]
    ttk::button .fo.bo -text "Ok"    -command "applyFont $lb ; destroy .fo"
    ttk::button .fo.ba -text "Apply" -command "applyFont $lb"
    ttk::button .fo.bc -text "Close" -command "destroy .fo"

    if {![info exists FontCache]} {
        set fam [lsort -dictionary [font families]]

}

###########################
# Editor for ::Pref(regsub)
###########################

proc EditPrefRegsubOk {top w} {
    set exa $::eskil($top,prefregexa)

    set result {}
    for {set t 1} {[info exists ::eskil($top,prefregexp$t)]} {incr t} {
        set RE $::eskil($top,prefregexp$t)
        set Sub $::eskil($top,prefregsub$t)
        if {$RE eq ""} continue

        if {[catch {regsub -all -- $RE $exa $Sub _} err]} {
            return
        }
        lappend result $RE $Sub
    }

    set ::Pref(regsub) $result
    destroy $w

    array unset ::eskil $top,prefregexp*
    array unset ::eskil $top,prefregsub*
}

proc EditPrefRegsubUpdate {top args} {
    set exa $::eskil($top,prefregexa)
    set exa2 $::eskil($top,prefregexa2)
    set ok $::widgets($top,prefRegsubOk)

    for {set t 1} {[info exists ::eskil($top,prefregexp$t)]} {incr t} {
        set RE $::eskil($top,prefregexp$t)
        set Sub $::eskil($top,prefregsub$t)

        if {$RE eq ""} continue

        if {[catch {regsub -all -- $RE $exa $Sub result} err]} {
            set ::eskil($top,prefregresult) "$t ERROR: $err"
            $ok configure -state disabled
            return
        } else {
            set exa $result
        }
        if {[catch {regsub -all -- $RE $exa2 $Sub result} err]} {
            set ::eskil($top,prefregresult2) "$t ERROR: $err"
            $ok configure -state disabled
            return
        } else {
            set exa2 $result
        }
    }
    set ::eskil($top,prefregresult2) $exa2
    set ::eskil($top,prefregresult) $exa
    $ok configure -state normal
}

proc AddPrefRegsub {top parent} {
    for {set t 1} {[winfo exists $parent.fr$t]} {incr t} {
        #Empty
    }
    set w [ttk::frame $parent.fr$t -borderwidth 2 -relief groove -padding 3]
    ttk::label $w.l1 -text "Regexp:" -anchor "w"
    ttk::entryX $w.e1 -textvariable ::eskil($top,prefregexp$t) -width 60
    ttk::label $w.l2 -text "Subst:" -anchor "w"
    ttk::entryX $w.e2 -textvariable ::eskil($top,prefregsub$t)

    grid $w.l1 $w.e1 -sticky we -padx 3 -pady 3
    grid $w.l2 $w.e2 -sticky we -padx 3 -pady 3
    grid columnconfigure $w 1 -weight 1

    pack $w -side "top" -fill x -padx 3 -pady 3

    trace add variable ::eskil($top,prefregexp$t) write \
            [list EditPrefRegsubUpdate $top]
    trace add variable ::eskil($top,prefregsub$t) write \
            [list EditPrefRegsubUpdate $top]
}

# Editor for ::Pref(regsub)
proc EditPrefRegsub {top} {
    set w $top.prefregsub

    if {[winfo exists $w] && [winfo toplevel $w] eq $w} {
        wm deiconify $w
        raise $w
        focus $w
    } else {
        toplevel $w -padx 3 -pady 3
        wm title $w "Preferences: Preprocess"
    }

    ttk::button $w.b -text "Add" -command [list AddPrefRegsub $top $w]

    # Result example part
    if {![info exists ::eskil($top,prefregexa)]} {
        set ::eskil($top,prefregexa) \
                "An example TextString FOR_REGSUB /* Comment */"
        set ::eskil($top,prefregexa2) \
                "An example TextString FOR_REGSUB /* Comment */"
    }
    ttk::labelframe $w.res -text "Preprocessing result" -padding 3
    ttk::label $w.res.l3 -text "Example 1:" -anchor "w"
    ttk::entryX $w.res.e3 -textvariable ::eskil($top,prefregexa) -width 60
    ttk::label $w.res.l4 -text "Result 1:" -anchor "w"
    ttk::label $w.res.e4 -textvariable ::eskil($top,prefregresult) \
            -anchor "w" -width 10
    ttk::label $w.res.l5 -text "Example 2:" -anchor "w"
    ttk::entryX $w.res.e5 -textvariable ::eskil($top,prefregexa2)
    ttk::label $w.res.l6 -text "Result 2:" -anchor "w"
    ttk::label $w.res.e6 -textvariable ::eskil($top,prefregresult2) \
            -anchor "w" -width 10

    grid $w.res.l3 $w.res.e3 -sticky we -padx 3 -pady 3
    grid $w.res.l4 $w.res.e4 -sticky we -padx 3 -pady 3
    grid $w.res.l5 $w.res.e5 -sticky we -padx 3 -pady 3
    grid $w.res.l6 $w.res.e6 -sticky we -padx 3 -pady 3
    grid columnconfigure $w.res 1 -weight 1

    # Fill in existing or an empty line
    if {[llength $::Pref(regsub)] == 0} {
        AddPrefRegsub $top $w
    } else {
        set t 1
        foreach {RE Sub} $::Pref(regsub) {
            set ::eskil($top,prefregexp$t) $RE
            set ::eskil($top,prefregsub$t) $Sub
            AddPrefRegsub $top $w
            incr t
        }
    }

    trace add variable ::eskil($top,prefregexa) write \
            [list EditPrefRegsubUpdate $top]
    trace add variable ::eskil($top,prefregexa2) write \
            [list EditPrefRegsubUpdate $top]
    EditPrefRegsubUpdate $top
}

proc defaultGuiOptions {} {
    catch {package require griffin}

    }

    # Ok, we have a normal diff
    set top [makeDiffWin]
    update
    # Copy the previously collected options
    foreach {item val} [array get opts] {
        set ::eskil($top,$item) $val
    }

    # It is preferable to see the end if the rev string is too long
    $::widgets($top,rev1) xview end
    $::widgets($top,rev2) xview end

    if {$doreview} {
        set rev [detectRevSystem "" $preferedRev]
        set ::eskil($top,modetype) $rev
        set ::eskil($top,mode) "patch"
        set ::eskil($top,patchFile) ""
        set ::eskil($top,patchData) ""
        set ::eskil($top,reviewFiles) $files
        set ::Pref(toolbar) 1
        after idle [list doDiff $top]
        return $top
    }
    if {$len == 1 || $foreach} {
        set ReturnAfterLoop 0
        set first 1
        foreach file $files {
            if {$first} {
                set first 0
            } else {
                # Create new window for other files
                set top [makeDiffWin]
                update
                # Copy the previously collected options
                foreach {item val} [array get opts] {
                    set ::eskil($top,$item) $val
                }
                # It is preferable to see the end if the rev string is too long
                $::widgets($top,rev1) xview end
                $::widgets($top,rev2) xview end
            }
            set fullname $file
            set fulldir [file dirname $fullname]
            if {$::eskil($top,mode) eq "conflict"} {
                startConflictDiff $top $fullname
                after idle [list doDiff $top]
                set ReturnAfterLoop 1
                continue
            }
            if {!$autobrowse && !$dopatch} {
                # Check for revision control
                set rev [detectRevSystem $fullname $preferedRev]
                if {$rev ne ""} {
                    startRevMode $top $rev $fullname
                    if {$noautodiff} {
                        enableRedo $top
                    } else {
                        after idle [list doDiff $top]
                    }
                    set ReturnAfterLoop 1
                    continue
                }
            }
            # No revision control. Is it a patch file?
            set ::eskil($top,leftDir) $fulldir
            set ::eskil($top,leftFile) $fullname
            set ::eskil($top,leftLabel) $fullname
            set ::eskil($top,leftOK) 1
            if {$dopatch                                 || \
                    [regexp {\.(diff|patch)$} $fullname] || \
                    $fullname eq "-"} {
                set ::eskil($top,mode) "patch"
                set ::eskil($top,patchFile) $fullname
                set ::eskil($top,patchData) ""
                set autobrowse 0
                if {$noautodiff} {
                    enableRedo $top
                } else {
                    after idle [list doDiff $top]
                }
                set ReturnAfterLoop 1
                continue
            }
        }
        if {$ReturnAfterLoop} {return $top}
    } elseif {$len >= 2} {
        set fullname [file join [pwd] [lindex $files 0]]
        set fulldir [file dirname $fullname]
        set ::eskil($top,leftDir) $fulldir
        set ::eskil($top,leftFile) $fullname
        set ::eskil($top,leftLabel) $fullname
        set ::eskil($top,leftOK) 1
        set fullname [file join [pwd] [lindex $files 1]]
        set fulldir [file dirname $fullname]
        set ::eskil($top,rightDir) $fulldir
        set ::eskil($top,rightFile) $fullname
        set ::eskil($top,rightLabel) $fullname
        set ::eskil($top,rightOK) 1
        if {$noautodiff} {
            enableRedo $top
        } else {
            after idle [list doDiff $top]
        }
    }
    if {$autobrowse && (!$::eskil($top,leftOK) || !$::eskil($top,rightOK))} {
        if {!$::eskil($top,leftOK) && !$::eskil($top,rightOK)} {
            openBoth $top 0
        } elseif {!$::eskil($top,leftOK)} {
            openLeft $top
        } elseif {!$::eskil($top,rightOK)} {
            openRight $top
        }
        # If we cancel the second file and detect CVS, ask about it.
        if {$::eskil($top,leftOK) && !$::eskil($top,rightOK) && \
                [llength [glob -nocomplain [file join $fulldir CVS]]]} {

            if {[tk_messageBox -title Diff -icon question \
                    -message "Do CVS diff?" -type yesno] eq "yes"} {
                set fullname $::eskil($top,leftFile)
                set ::eskil($top,leftOK) 0
                startRevMode $top "CVS" $fullname
                after idle [list doDiff $top]
            }
        }
    }
    return $top
}

    # Store default preferences, to filter saved preferences
    array set ::DefaultPref [array get Pref]

    # Backward compatibilty option
    set Pref(onlydiffs) -1

    set ::eskil(filter) ""

    if {![info exists ::eskil_testsuite] && [file exists "~/.eskilrc"]} {
        safeLoad "~/.eskilrc" Pref
    }

    if {$Pref(editor) ne ""} {
        set ::util(editor) $Pref(editor)