structure OutputTutorial =

struct

(* rebuilding the output function from ThyOutput in order to *)

(* enable the options [gray, linenos]                        *)

val gray = Unsynchronized.ref false

val linenos = Unsynchronized.ref false

fun output txt =

let

  val prts = map Pretty.str txt

in   

  prts

  |> (if ! ThyOutput.quotes then map Pretty.quote else I)

  |> (if ! ThyOutput.display then

    map (Output.output o Pretty.string_of o Pretty.indent (! ThyOutput.indent))

    #> space_implode "\\isasep\\isanewline%\n"

    #> (if ! linenos then (enclose "\\begin{linenos}%\n" "%\n\\end{linenos}") else I) 

    #> (if ! gray then (enclose "\\begin{graybox}%\n" "%\n\\end{graybox}") else I) 

    #> enclose "\\begin{isabelle}%\n" "%\n\\end{isabelle}"

  else

    map (Output.output o (if ! ThyOutput.break then Pretty.string_of else Pretty.str_of))

    #> space_implode "\\isasep\\isanewline%\n"

    #> enclose "\\isa{" "}")

end

datatype indstring =

  NoString

| Plain   of string

| Code    of string

| Struct  of string

fun translate_string f = Symbol.explode #> map f #> implode;

val clean_string = translate_string

  (fn "_" => "\\_"

    | "#" => "\\#"

    | "<" => "\\isacharless"

    | ">" => "\\isachargreater"

    | "{" => "\\{"

    | "|" => "\\isacharbar"

    | "}" => "\\}"

    | "$" => "\\isachardollar"

    | "!" => "\\isacharbang"

    | "\<dash>" => "-"

    | c => c)

fun get_word str =

let 

  fun only_letters [] = true

    | only_letters (x::xs) = 

        if (Symbol.is_ascii_blank x) then false else only_letters xs

in

  if only_letters (Symbol.explode str) 

  then clean_string str

  else error ("Only single word allowed! Error with " ^ quote str)

end  

fun get_indstring NoString = ""

  | get_indstring (Plain s) = get_word s

  | get_indstring (Code s) = let val w = get_word s in implode[w, "@{\\tt\\slshape{}", w, "}"] end

  | get_indstring (Struct s) =  implode ["in {\\tt\\slshape{}", get_word s, "}"]

fun get_index {main = m, minor = n} = 

 (if n = NoString

  then implode ["\\index{", get_indstring m, "}"]  

  else implode ["\\index{", get_indstring m, " (", get_indstring n, ")}"])  

fun output_indexed ind txt =

 txt |> output

     |> prefix (get_index ind)

fun boolean "" = true

  | boolean "true" = true

  | boolean "false" = false

  | boolean s = error ("Bad boolean value: " ^ quote s);

val _ = ThyOutput.add_options

 [("gray", Library.setmp_CRITICAL gray o boolean),

  ("linenos", Library.setmp_CRITICAL linenos o boolean)]

end