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+ 2005-12-25"
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}

    } else {
        wm title $top "Eskil: $tail2 vs $tail1"
    }

    # Run diff and parse the result.
    set opts $Pref(ignore)
    if {$Pref(nocase)} {lappend opts -nocase}

    if {[info exists ::diff($top,aligns)] && \
            [llength $::diff($top,aligns)] > 0} {
        lappend opts -align $::diff($top,aligns)
    }
    set range {}
    if {[info exists ::diff($top,range)] && \
            [llength $::diff($top,range)] == 4} {
        set range $::diff($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}

    set differr [catch {eval DiffUtil::diffFiles $opts \
            \$::diff($top,leftFile) \$::diff($top,rightFile)} 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.

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

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

        if {$RE eq ""} continue

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

  -b          : Ignore space changes. Default.
  -w          : Ignore all spaces.
  -nocase     : Ignore case changes.
  -nodigit    : Ignore digit changes.
  -nokeyword  : In directory diff, ignore $ Keywords: $

  -prefix <str> : Care mainly about words starting with "str".
  -preprocess <pair> : TBW

  -r <ver>    : Version info for CVS/RCS/ClearCase diff.

  -conflict   : Treat file as a merge conflict file and enter merge
                mode.
  -o <file>   : Specify merge result output file.

        return
    }
    
    set allOpts {
        -w --help -help -b -noignore -i -nocase -nodigit -nokeyword -prefix
        -noparse -line -smallblock -block -char -word -limit -nodiff -dir
        -clip -patch -browse -conflict -print -server -o -r -context
        -foreach -preprocess
    }

    # If the first option is "--query", use it to ask about options.
    if {$::eskil(argc) == 2 && [lindex $::eskil(argv) 0] == "--query"} {
        set arg [lindex $::eskil(argv) 1]
        if {[lsearch -exact $allOpts $arg] < 0} {
            set match [lsearch -glob -all -inline $allOpts $arg*]

            } elseif {$nextArg eq "context"} {
                set Pref(context) $arg
            } elseif {$nextArg eq "prefix"} {
                set RE [string map [list % $arg] {^.*?\m(%\w+).*$}]
                if {$Pref(nocase)} {
                    set RE "(?i)$RE"
                }
                lappend ::Pref(regsub) $RE {\1}
            } elseif {$nextArg eq "preprocess"} {
                if {[catch {llength $arg} len]} {

                } elseif {[llength $arg] % 2 == 1} {

                } else {
                    # FIXA: better validity check
                    foreach {RE sub} $arg {
                        lappend ::Pref(regsub) $RE $sub
                    }
                }
            }
            set nextArg ""
            continue
        }
        # Take care of the special case of RCS style -r<rev>
        if {[string range $arg 0 1] eq "-r" && [string length $arg] > 2} {
            set opts(doptrev$revNo) [string range $arg 2 end]

            set Pref(nocase) 1
        } elseif {$arg eq "-nodigit"} {
            set Pref(nodigit) 1
        } elseif {$arg eq "-nokeyword"} {
            set Pref(dir,ignorekey) 1
        } elseif {$arg eq "-prefix"} {
            set nextArg prefix
        } elseif {$arg eq "-preprocess"} {
            set nextArg preprocess
        } elseif {$arg eq "-context"} {
            set nextArg context
        } elseif {$arg eq "-noparse"} {
            set Pref(parse) 0
        } elseif {$arg eq "-line"} {
            set Pref(parse) 1
        } elseif {$arg eq "-smallblock"} {