############################################################################
#
#	File:     tryfont.icn
#
#	Subject:  Program to demonstrate X font rankings
#
#	Author:   Gregg M. Townsend
#
#	Date:     July 18, 1995
#
############################################################################
#
#   This file is in the public domain.
#
############################################################################
#
#     tryfont repeatedly reads a font specification from standard input
#  and displays, with their scores, a windowfull of available fonts that
#  best match that specification.  The window can be resized when tryfont
#  is paused at a prompt; the new size is used for the next list.
#
#     Note that tryfont uses the library procedure BestFont() for ranking;
#  this can differ from the rankings used by the Icon runtime system's
#  font selection logic.
#
#     tryfont can also be run in ASCII mode, without using X windows, by
#  passing a file name as a command argument.  The file should contain
#  a list of X fonts, such as from the xlsfonts program.  The number of
#  fonts printed on standard output can be specified as a second argument.
#
#     For details of font specifications, see BestFont().
#
############################################################################
#
#  Requires:  Version 9 graphics
#
############################################################################
#
#  Links: options, optwindw, xbfont, graphics
#
############################################################################


link options
link optwindw
link xbfont
link graphics


procedure main(args)
   if *args > 0 & args[1][1] ~== "-" then
      filemode(args)
   else
      windowmode(args)
end


procedure filemode(args)
   local fname, limit, f, fontlist, request, a

   fname := args[1]
   limit := integer(args[2]) | 20
   f := open(fname) | stop("can't open ", fname)
   every put(fontlist := [], !f)
   repeat {
      writes("> ")
      request := trim(read()) | return
      if *request = 0 then
         next
      every a := RankFonts(fontlist, request) \ limit do
         write(right(a.val, 5), "\t", a.str)
      write()
      }
end


procedure windowmode(args)
   local opts, win, fwin, request, a, h, y

   opts := options(args, winoptions())
   /opts["W"] := 900
   /opts["H"] := 300
   /opts["M"] := -1
   win := optwindow(opts, "cursor=off", "echo=off")
   fwin := Clone(win)

   &error := 1
   WAttrib(win, "resize=on")
   &error := 0

   repeat {
      writes("> ")
      request := trim(read()) | return
      if *request = 0 then
         next
      h := WAttrib(win, "height")
      y := 0
      EraseArea(win)
      every a := RankFonts(win, request) do {
         Font(fwin, a.str)
         y +:= WAttrib(fwin, "fheight") - WAttrib(fwin, "descent")
         GotoXY(win, 10, y)
         writes(win, right(a.val, 4), "  ")
         writes(fwin, a.str)
         y +:= WAttrib(fwin, "descent")
         if y >= h then
            break
         }
      }
end