Fossil Wrapper

         incr revcnt
         regexp $rgxrev $line rev
         dict set revnums $rev [expr {$numrev - $revcnt}]
      }
   }
   return $revnums
}

proc cihashLookup {lines} {
   set cihashes {}
   foreach line $lines {
      # FIXME: there must be a nicer way to handle `grep -l' as well,
      # no?
      set fhash [string trimright [first [split $line :]]]

      if { [catch {dict get $cihashes $fhash} dum] }  {
         # no entry, yet, for this file artifact ...
         set report [split [exec fossil whatis $fhash] \n]
         set rgxpat {^[^[]+(\[[0-9a-f]+\])}
         regexp $rgxpat [lindex $report 4] _ cihash
         dict set cihashes $fhash $cihash
      }
   }
   return $cihashes
}

proc fixGrep {lines params} {
   set revnums [computeRevnums $params]
   set cihashes [cihashLookup $lines]
   set greppat [lindex $params end-1]
   foreach line $lines {
      set fhash [string trimright [first [split $line :]]]
      set cihash [dict get $cihashes $fhash]
      set revnum [dict get $revnums $cihash]
      # for now, we just preprend the chronological revision numbers and
      # add a bit of colour
      regsub -all "(.*?)($greppat)(.*)" $line \\1[coloured red \\2]\\3 line
      lappend out [coloured magenta $revnum]:$line
   }
   return $out
}

proc adjustWidth params {
   set widopt {}
   regexp -- {(timeline|finfo|search|descendants).*(-W)} $params widopt
   if {$widopt == ""} then {
      # determine total number of checkins for computation of required
      # additional space. the following works for the current format of

    if {![empty? $chain]} {
        log_user 0;             # disable logging to stdout
    }
    if {![interactive? $params]} {
        set stty_init -onlcr;   # do not map LF to CRLF on output
    }

    # FIXME: reconcider the overall logic of how to handle log_user
    # on/off. it is slowly becoming a mess. previously log_user was
    # off if the filter chain is empty. *re*setting the filter chain
    # to `passthrough' then is not a problem (as is done for
    # 'timeline' etc.) but it _is_ a problem for commands that lead to
    # an empty filter chain while something is done to their output
    # elsewhere, as is the case for `grep' now. maybe we can put
    # everything in a grep filter instead so that this explicit test
    # for grep becomes obsolete:
    if {$command == "grep"} { log_user 0 }

    #ensure that `lines' always exists:
    set lines {}
    # Call to `fossil' binary:
    spawn -noecho fossil {*}$params
    while 1 {
        if {[interactive? $params]} {
            interact; break

          } elseif {[regexp {finfo.*-b} $params]} {
             set revnums [computeRevnums $params]
             set lines [reformFinfo-b $lines $revnums]
          } else {
             set revnums [computeRevnums $params]
             set lines [reformTimeline $lines $revnums $command]
          }
       } elseif {$command == "grep" && [llength $lines] > 1} {
             set lines [fixGrep $lines $params]
             set chain ::config::fslrc::passthrough
       }

       if {$::config::dbglvl > 1} {puts "*** filter chain: [join $chain ", "]"}

       foreach line $lines {
          if {$::config::dbglvl > 98} {
             catch {puts "IN: >$line<"}