#	LABELS
#
#	Format mailing labels
#
#	Ralph E. Griswold
#
#	Last modified 12/25/85
#

global line, lsize, repet, llength, ldepth, first

procedure main(x)
   local selectors, use, y, i
   line := ""
   selectors := '#'
   lsize := 9
   ldepth := 8
   llength := 40
   repet := 1
   i := 0
   use := "usage: labels [-c n] [-s s] [-t] [-d n] [-w n] [-l n] [-f]"
   while y := x[i +:= 1] do
      case y of {
         "-f":  first := 1
         "-s": selectors := cset(x[i +:= 1]) | stop(use)
         "-t":  {
            lsize := 12
            if ldepth > lsize then ldepth := lsize
            }
         "-w":  llength := (0 < integer(x[i +:= 1])) | stop(use)
         "-l":  {
            ldepth := (0 < integer(x[i +:= 1])) | stop(use)
            if lsize < ldepth then lsize := ldepth
            }
         "-d":  {
            lsize := (0 < integer(x[i +:= 1])) | stop(use)
            if ldepth > lsize then ldepth := lsize
            }
         "-c": repet := (0 < integer(x[i +:= 1])) | stop(use)
         default: stop(use)
         }
   repeat {				# processing loop
      if line[1] == "#" & upto(selectors,line)
         then obtain() else {
            line := read() | break
            }
      }
end

#  Obtain next label
#
procedure obtain()
   local label, max
   label := []
   max := 0
   line := ""
   while line := read() do {
      if line[1] == "*" then next
      if line[1] == "#" then break
      if \first then {
         write(line)
         return
         }
      else put(label,line)
      max <:= *line
      if *label > ldepth then {
         error(label[1],1)
         return
         }
      if max > llength then {
         error(label[1],2)
         return
         }
      }
   every 1 to repet do format(label,max)
end

#  Format a label
#
procedure format(label,width)
   local j, indent
   indent := repl(" ",(llength - width) / 2)
   j := lsize - *label
   every 1 to j / 2 do write()
   every write(indent,!label)
   every 1 to (j + 1) / 2 do write()
end

#  Issue label for an error
#
procedure error(name,type)
   static badform
   initial badform := list(lsize)
   case type of {
      1:  badform[3] := "     **** too many lines"
      2:  badform[3] := "     **** line too long"
      }
   badform[1] := name
   every write(&errout,!badform)
end