src/Pure/Tools/doc.scala
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/*  Title:      Pure/Tools/doc.scala
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    Author:     Makarius
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Access to Isabelle documentation.
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*/
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package isabelle
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import scala.util.matching.Regex
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object Doc
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{
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  /* dirs */
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  def dirs(): List[Path] =
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    Path.split(Isabelle_System.getenv("ISABELLE_DOCS")).map(dir =>
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      if (dir.is_dir) dir
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      else error("Bad documentation directory: " + dir))
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  /* contents */
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  private def contents_lines(): List[(Path, String)] =
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    for {
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      dir <- dirs()
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      catalog = dir + Path.basic("Contents")
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      if catalog.is_file
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      line <- split_lines(Library.trim_line(File.read(catalog)))
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    } yield (dir, line)
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  sealed abstract class Entry
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  case class Section(text: String, important: Boolean) extends Entry
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  case class Doc(name: String, title: String, path: Path) extends Entry
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  case class Text_File(name: String, path: Path) extends Entry
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  def text_file(name: Path): Option[Text_File] =
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  {
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    val path = Path.variable("ISABELLE_HOME") + name
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    if (path.is_file) Some(Text_File(name.implode, path))
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    else None
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  }
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  private val Section_Entry = new Regex("""^(\S.*)\s*$""")
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  private val Doc_Entry = new Regex("""^\s+(\S+)\s+(.+)\s*$""")
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  private def release_notes(): List[Entry] =
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    Section("Release notes", true) ::
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      Path.split(Isabelle_System.getenv_strict("ISABELLE_DOCS_RELEASE_NOTES")).flatMap(text_file(_))
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  private def examples(): List[Entry] =
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    Section("Examples", true) ::
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      Path.split(Isabelle_System.getenv_strict("ISABELLE_DOCS_EXAMPLES")).map(file =>
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        text_file(file) match {
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          case Some(entry) => entry
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          case None => error("Bad entry in ISABELLE_DOCS_EXAMPLES: " + file)
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        })
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  def contents(): List[Entry] =
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    (for {
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      (dir, line) <- contents_lines()
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      entry <-
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        line match {
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          case Section_Entry(text) =>
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            Library.try_unsuffix("!", text) match {
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              case None => Some(Section(text, false))
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              case Some(txt) => Some(Section(txt, true))
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            }
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          case Doc_Entry(name, title) => Some(Doc(name, title, dir + Path.basic(name)))
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          case _ => None
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        }
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    } yield entry) ::: release_notes() ::: examples()
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  /* view */
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  def view(path: Path)
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  {
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    if (path.is_file) Console.println(Library.trim_line(File.read(path)))
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    else {
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      val pdf = path.ext("pdf")
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      if (pdf.is_file) Isabelle_System.pdf_viewer(pdf)
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      else error("Bad Isabelle documentation file: " + pdf)
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    }
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  }
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  /* command line entry point */
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  def main(args: Array[String])
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  {
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    Command_Line.tool0 {
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      val entries = contents()
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      if (args.isEmpty) Console.println(cat_lines(contents_lines().map(_._2)))
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      else {
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        args.foreach(arg =>
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          entries.collectFirst { case Doc(name, _, path) if arg == name => path } match {
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            case Some(path) => view(path)
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            case None => error("No Isabelle documentation entry: " + quote(arg))
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          }
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        )
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      }
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    }
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  }
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}
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