Fossil with Commonmark

@     }
@   }
@   
@   foreach c {.lnA .lnB .mkr} {
@     $c config -width $gDiffs($idx,[colType $c]-width)
@   }
@   
@   # Add whitespace to equalize line lengths.
@   regexp {\d+} [.txtA index {end -1c}] numLines
@   set width $gDiffs($idx,txt-width)
@   foreach c {.txtA .txtB} {
@     for {set ln 1} {$ln <= $numLines} {incr ln} {
@       regexp {\d+$} [$c index $ln.end] len
@       $c insert $ln.end [string repeat " " [expr {$width-$len}]] ws
@     }
@   }
@   
@   foreach c [cols] {
@     $c config -state disabled
@   }
@ }
@ 
@ proc cycleDiffs {{inc 1}} {
@   global gIdx

@     } else {
@       grid $sb
@       $sb set $first $last
@     }
@   }
@ }
@ 
@ proc copyText {c} {
@   set txt ""
@   # Copy selection without excess trailing whitespace
@   $c tag config ws -elide 1
@   catch {
@     $c tag add sel sel.first sel.last
@     set txt [selection get]
@   }
@   $c tag config ws -elide 0
@   clipboard clear
@   clipboard append $txt
@ }
@ 
@ wm withdraw .
@ wm title . $CFG(TITLE)
@ wm iconname . $CFG(TITLE)
@ bind . <q> exit
@ bind . <Tab> {cycleDiffs; break}
@ bind . <<PrevWindow>> {cycleDiffs -1; break}
@ bind . <Return> {

@   set txt .txt$side
@   text $txt -width $CFG(WIDTH) -height $CFG(HEIGHT) -wrap none \
@     -xscroll {scrollSync x {.sbxA .sbxB}}
@   foreach tag {add rm chng} {
@     $txt tag config $tag -background $CFG([string toupper $tag]_BG)
@     $txt tag lower $tag
@   }
@   bind $txt <<Copy>> {copyText %W; break}
@   bind $txt <<Cut>> {copyText %W; break}
@ }
@ text .mkr
@ 
@ font create mono -family courier -size $CFG(FONT_SIZE)
@ foreach font $CFG(FONTS) {
@   if {[lsearch -exact [font families] $font] != -1} {
@      font config mono -family $font