src/Pure/Build/browser_info.scala

+/*  Title:      Pure/Build/browser_info.scala
+    Author:     Makarius
+
+HTML/PDF presentation of PIDE document information.
+*/
+
+package isabelle
+
+
+import scala.annotation.tailrec
+import scala.collection.immutable.SortedMap
+import scala.collection.mutable
+
+
+object Browser_Info {
+  /* browser_info store configuration */
+
+  object Config {
+    val none: Config = new Config { def enabled: Boolean = false }
+    val standard: Config = new Config { def enabled: Boolean = true }
+
+    def dir(path: Path): Config =
+      new Config {
+        def enabled: Boolean = true
+        override def presentation_dir(store: Store): Path = path
+      }
+
+    def make(s: String): Config =
+      if (s == ":") standard else dir(Path.explode(s))
+  }
+
+  abstract class Config private {
+    def enabled: Boolean
+    def enabled(info: Sessions.Info): Boolean = enabled || info.browser_info
+    def presentation_dir(store: Store): Path = store.presentation_dir
+  }
+
+
+  /* meta info within the file-system */
+
+  object Meta_Info {
+    /* directory */
+
+    val PATH: Path = Path.explode(".browser_info")
+
+    def check_directory(dir: Path): Unit = {
+      if (dir.is_dir && !(dir + PATH).is_dir && File.read_dir(dir).nonEmpty) {
+        error("Existing content in " + dir.expand + " lacks " + PATH + " meta info.\n" +
+          "To avoid potential disaster, it has not been changed automatically.\n" +
+          "If this is the intended directory, please move/remove/empty it manually.")
+      }
+    }
+
+    def init_directory(dir: Path): Path = {
+      check_directory(dir)
+      Isabelle_System.make_directory(dir + PATH)
+      dir
+    }
+
+    def clean_directory(dir: Path): Path = {
+      check_directory(dir)
+      Isabelle_System.rm_tree(dir)  // guarded by check_directory!
+      Isabelle_System.new_directory(dir + PATH)
+    }
+
+
+    /* content */
+
+    def make_path(dir: Path, name: String): Path =
+      dir + PATH + Path.basic(name)
+
+    def value(dir: Path, name: String): String = {
+      val path = make_path(dir, name)
+      if (path.is_file) File.read(path) else ""
+    }
+
+    def change(dir: Path, name: String)(f: String => String): Unit = {
+      val path = make_path(dir, name)
+      val x = value(dir, name)
+      val y =
+        try { f(x) }
+        catch { case ERROR(msg) => error("Failed to change " + path.expand + ":\n" + msg)}
+      if (x != y) File.write(path, y)
+    }
+
+
+    /* build_uuid */
+
+    val BUILD_UUID = "build_uuid"
+
+    def check_build_uuid(dir: Path, uuid: String): Boolean = {
+      val uuid0 = value(dir, BUILD_UUID)
+      uuid0.nonEmpty && uuid.nonEmpty && uuid0 == uuid
+    }
+
+    def set_build_uuid(dir: Path, uuid: String): Unit =
+      change(dir, BUILD_UUID)(_ => uuid)
+
+
+    /* index */
+
+    val INDEX = "index.json"
+
+    object Item {
+      def parse(json: JSON.T): Item = {
+        def err(): Nothing =
+          error("Bad JSON object for item:\n" + JSON.Format.pretty_print(json))
+        val obj = JSON.Object.unapply(json) getOrElse err()
+
+        val name = JSON.string(obj, "name") getOrElse err()
+        val description = JSON.string(obj, "description") getOrElse ""
+        Item(name, description = Symbol.trim_blank_lines(description))
+      }
+    }
+
+    sealed case class Item(name: String, description: String = "") {
+      override def toString: String = name
+
+      def json: JSON.T = JSON.Object("name" -> name, "description" -> description)
+    }
+
+    object Index {
+      def parse(s: JSON.S, kind: String): Index = {
+        if (s.isEmpty) Index(kind, Nil)
+        else {
+          def err(): Nothing = error("Bad JSON object " + kind + " index:\n" + s)
+
+          val json = JSON.parse(s)
+          val obj = JSON.Object.unapply(json) getOrElse err()
+
+          val kind1 = JSON.string(obj, "kind") getOrElse err()
+          val items = JSON.list(obj, "items", x => Some(Item.parse(x))) getOrElse err()
+          if (kind == kind1) Index(kind, items)
+          else error("Expected index kind " + quote(kind) + " but found " + quote(kind1))
+        }
+      }
+    }
+
+    sealed case class Index(kind: String, items: List[Item]) {
+      def is_empty: Boolean = items.isEmpty
+
+      def + (item: Item): Index =
+        Index(kind, (item :: items.filterNot(_.name == item.name)).sortBy(_.name))
+
+      def json: JSON.T = JSON.Object("kind" -> kind, "items" -> items.map(_.json))
+      def print_json: JSON.S = JSON.Format.pretty_print(json)
+    }
+  }
+
+
+  /* presentation elements */
+
+  sealed case class Elements(
+    html: Markup.Elements = Markup.Elements.empty,
+    entity: Markup.Elements = Markup.Elements.empty,
+    language: Markup.Elements = Markup.Elements.empty)
+
+  val default_elements: Elements =
+    Elements(
+      html = Rendering.foreground_elements ++ Rendering.text_color_elements +
+        Markup.NUMERAL + Markup.COMMENT + Markup.ENTITY + Markup.LANGUAGE +
+        Markup.PATH + Markup.URL,
+      entity = Markup.Elements(Markup.THEORY, Markup.TYPE_NAME, Markup.CONSTANT, Markup.FACT,
+        Markup.CLASS, Markup.LOCALE, Markup.FREE))
+
+  val extra_elements: Elements =
+    Elements(
+      html = default_elements.html ++ Rendering.markdown_elements,
+      language = Markup.Elements(Markup.Language.DOCUMENT))
+
+
+
+  /** HTML/PDF presentation context **/
+
+  def context(
+    sessions_structure: Sessions.Structure,
+    elements: Elements = default_elements,
+    root_dir: Path = Path.current,
+    document_info: Document_Info = Document_Info.empty
+  ): Context = new Context(sessions_structure, elements, root_dir, document_info)
+
+  class Context private[Browser_Info](
+    sessions_structure: Sessions.Structure,
+    val elements: Elements,
+    val root_dir: Path,
+    val document_info: Document_Info
+  ) {
+    /* directory structure and resources */
+
+    def theory_by_name(session: String, theory: String): Option[Document_Info.Theory] =
+      document_info.theory_by_name(session, theory)
+
+    def theory_by_file(session: String, file: String): Option[Document_Info.Theory] =
+      document_info.theory_by_file(session, file)
+
+    def session_chapter(session: String): String =
+      sessions_structure(session).chapter
+
+    def chapter_dir(session: String): Path =
+      root_dir + Path.basic(session_chapter(session))
+
+    def session_dir(session: String): Path =
+      chapter_dir(session) + Path.basic(session)
+
+    def theory_dir(theory: Document_Info.Theory): Path =
+      session_dir(theory.dynamic_session)
+
+    def theory_html(theory: Document_Info.Theory): Path =
+    {
+      def check(name: String): Option[Path] = {
+        val path = Path.basic(name).html
+        if (Path.eq_case_insensitive(path, Path.index_html)) None
+        else Some(path)
+      }
+      check(theory.print_short) orElse check(theory.name) getOrElse
+        error("Illegal global theory name " + quote(theory.name) +
+          " (conflict with " + Path.index_html + ")")
+    }
+
+    def file_html(file: String): Path =
+      Path.explode(file).squash.html
+
+    def smart_html(theory: Document_Info.Theory, file: String): Path =
+      if (File.is_thy(file)) theory_html(theory) else file_html(file)
+
+
+    /* HTML content */
+
+    def head(title: String, rest: XML.Body = Nil): XML.Tree =
+      HTML.div("head", HTML.chapter(title) :: rest)
+
+    def source(body: XML.Body): XML.Tree = HTML.pre("source", body)
+
+    def contents(
+      heading: String,
+      items: List[XML.Body],
+      css_class: String = "contents"
+    ) : List[XML.Elem] = {
+      if (items.isEmpty) Nil
+      else List(HTML.div(css_class, List(HTML.section(heading), HTML.itemize(items))))
+    }
+
+
+    /* preview PIDE document */
+
+    lazy val isabelle_css: String = File.read(HTML.isabelle_css)
+
+    def html_document(title: String, body: XML.Body, fonts_css: String): HTML_Document = {
+      val content =
+        HTML.output_document(
+          List(
+            HTML.style(fonts_css + "\n\n" + isabelle_css),
+            HTML.title(title)),
+          List(HTML.source(body)), css = "", structural = false)
+      HTML_Document(title, content)
+    }
+
+    def preview_document(
+      snapshot: Document.Snapshot,
+      plain_text: Boolean = false,
+      fonts_css: String = HTML.fonts_css()
+    ): HTML_Document = {
+      require(!snapshot.is_outdated, "document snapshot outdated")
+
+      val name = snapshot.node_name
+      if (plain_text) {
+        val title = "File " + Symbol.cartouche_decoded(name.file_name)
+        val body = HTML.text(snapshot.node.source)
+        html_document(title, body, fonts_css)
+      }
+      else {
+        Resources.html_document(snapshot) getOrElse {
+          val title =
+            if (name.is_theory) "Theory " + quote(name.theory_base_name)
+            else "File " + Symbol.cartouche_decoded(name.file_name)
+          val xml = snapshot.xml_markup(elements = elements.html)
+          val body = Node_Context.empty.make_html(elements, xml)
+          html_document(title, body, fonts_css)
+        }
+      }
+    }
+
+
+    /* maintain presentation structure */
+
+    def update_chapter(session_name: String, session_description: String): Unit = synchronized {
+      val dir = Meta_Info.init_directory(chapter_dir(session_name))
+      Meta_Info.change(dir, Meta_Info.INDEX) { text =>
+        val index0 = Meta_Info.Index.parse(text, "chapter")
+        val item = Meta_Info.Item(session_name, description = session_description)
+        val index = index0 + item
+
+        if (index != index0) {
+          val title = "Isabelle/" + session_chapter(session_name) + " sessions"
+          HTML.write_document(dir, "index.html",
+            List(HTML.title(title + Isabelle_System.isabelle_heading())),
+            HTML.chapter(title) ::
+              (if (index.is_empty) Nil
+              else
+                List(HTML.div("sessions",
+                  List(HTML.description(
+                    index.items.map(item =>
+                      (List(HTML.link(item.name + "/index.html", HTML.text(item.name))),
+                        if (item.description.isEmpty) Nil
+                        else HTML.break ::: List(HTML.pre(HTML.text(item.description)))))))))),
+            root = Some(root_dir))
+        }
+
+        index.print_json
+      }
+    }
+
+    def update_root(): Unit = synchronized {
+      Meta_Info.init_directory(root_dir)
+      HTML.init_fonts(root_dir)
+      Isabelle_System.copy_file(Path.explode("~~/lib/logo/isabelle.gif"),
+        root_dir + Path.explode("isabelle.gif"))
+
+      Meta_Info.change(root_dir, Meta_Info.INDEX) { text =>
+        val index0 = Meta_Info.Index.parse(text, "root")
+        val index = {
+          val items1 =
+            sessions_structure.known_chapters
+              .map(ch => Meta_Info.Item(ch.name, description = ch.description))
+          val items2 = index0.items.filterNot(item => items1.exists(_.name == item.name))
+          index0.copy(items = items1 ::: items2)
+        }
+
+        if (index != index0) {
+          val title = "The " + XML.text(Isabelle_System.isabelle_name()) + " Library"
+          HTML.write_document(root_dir, "index.html",
+            List(HTML.title(title + Isabelle_System.isabelle_heading())),
+            HTML.chapter(title) ::
+              (if (index.is_empty) Nil
+              else
+                List(HTML.div("sessions",
+                  List(HTML.description(
+                    index.items.map(item =>
+                      (List(HTML.link(item.name + "/index.html", HTML.text(item.name))),
+                        if (item.description.isEmpty) Nil
+                        else HTML.break ::: List(HTML.pre(HTML.text(item.description)))))))))),
+            root = Some(root_dir))
+        }
+
+        index.print_json
+      }
+    }
+  }
+
+  sealed case class HTML_Document(title: String, content: String)
+
+
+  /* formal entities */
+
+  object Theory_Ref {
+    def unapply(props: Properties.T): Option[String] =
+      (props, props) match {
+        case (Markup.Kind(Markup.THEORY), Markup.Name(theory)) => Some(theory)
+        case _ => None
+      }
+  }
+
+  object Entity_Ref {
+    def unapply(props: Properties.T): Option[(String, String, String)] =
+      (props, props, props, props) match {
+        case (Markup.Entity.Ref.Prop(_), Position.Def_File(file), Markup.Kind(kind), Markup.Name(name))
+        if Path.is_wellformed(file) => Some((file, kind, name))
+        case _ => None
+      }
+  }
+
+  object Node_Context {
+    val empty: Node_Context = new Node_Context
+
+    def make(
+      context: Context,
+      session_name: String,
+      theory_name: String,
+      file_name: String,
+      node_dir: Path,
+    ): Node_Context =
+      new Node_Context {
+        private val seen_ranges: mutable.Set[Symbol.Range] = mutable.Set.empty
+
+        override def make_def(range: Symbol.Range, body: XML.Body): Option[XML.Elem] =
+          body match {
+            case List(XML.Elem(Markup("span", List("id" -> _)), _)) => None
+            case _ =>
+              for (theory <- context.theory_by_name(session_name, theory_name))
+              yield {
+                val body1 =
+                  if (seen_ranges.contains(range)) {
+                    HTML.entity_def(HTML.span(HTML.id(offset_id(range)), body))
+                  }
+                  else HTML.span(body)
+                theory.get_defs(file_name, range).foldLeft(body1) {
+                  case (elem, entity) =>
+                    HTML.entity_def(HTML.span(HTML.id(entity.kname), List(elem)))
+                }
+              }
+          }
+
+        private def offset_id(range: Text.Range): String =
+          "offset_" + range.start + ".." + range.stop
+
+        override def make_file_ref(file: String, body: XML.Body): Option[XML.Elem] = {
+          for (theory <- context.theory_by_file(session_name, file))
+          yield {
+            val html_path = context.theory_dir(theory) + context.smart_html(theory, file)
+            val html_link = HTML.relative_href(html_path, base = Some(node_dir))
+            HTML.link(html_link, body)
+          }
+        }
+
+        override def make_ref(props: Properties.T, body: XML.Body): Option[XML.Elem] = {
+          props match {
+            case Theory_Ref(thy_name) =>
+              for (theory <- context.theory_by_name(session_name, thy_name))
+              yield {
+                val html_path = context.theory_dir(theory) + context.theory_html(theory)
+                val html_link = HTML.relative_href(html_path, base = Some(node_dir))
+                HTML.link(html_link, body)
+              }
+            case Entity_Ref(def_file, kind, name) =>
+              def logical_ref(theory: Document_Info.Theory): Option[String] =
+                theory.get_def(def_file, kind, name).map(_.kname)
+
+              def physical_ref(theory: Document_Info.Theory): Option[String] =
+                props match {
+                  case Position.Def_Range(range) if theory.name == theory_name =>
+                    seen_ranges += range
+                    Some(offset_id(range))
+                  case _ => None
+                }
+
+              for {
+                theory <- context.theory_by_file(session_name, def_file)
+                html_ref <- logical_ref(theory) orElse physical_ref(theory)
+              }
+              yield {
+                val html_path = context.theory_dir(theory) + context.smart_html(theory, def_file)
+                val html_link = HTML.relative_href(html_path, base = Some(node_dir))
+                HTML.entity_ref(HTML.link(html_link + "#" + html_ref, body))
+              }
+            case _ => None
+          }
+        }
+      }
+  }
+
+  class Node_Context {
+    def make_def(range: Symbol.Range, body: XML.Body): Option[XML.Elem] = None
+    def make_ref(props: Properties.T, body: XML.Body): Option[XML.Elem] = None
+    def make_file_ref(file: String, body: XML.Body): Option[XML.Elem] = None
+
+    val div_elements: Set[String] =
+      Set(HTML.div.name, HTML.pre.name, HTML.par.name, HTML.list.name, HTML.`enum`.name,
+        HTML.descr.name)
+
+    def make_html(elements: Elements, xml: XML.Body): XML.Body = {
+      def html_div(html: XML.Body): Boolean =
+        html exists {
+          case XML.Elem(markup, body) => div_elements.contains(markup.name) || html_div(body)
+          case XML.Text(_) => false
+        }
+
+      def html_class(c: String, html: XML.Body): XML.Body =
+        if (c == "") html
+        else if (html_div(html)) List(HTML.div(c, html))
+        else List(HTML.span(c, html))
+
+      def html_body(xml_body: XML.Body, end_offset: Symbol.Offset): (XML.Body, Symbol.Offset) =
+        xml_body.foldRight((List.empty[XML.Tree], end_offset)) { case (tree, (res, end_offset1)) =>
+          val (res1, offset) = html_body_single(tree, end_offset1)
+          (res1 ++ res, offset)
+        }
+
+      @tailrec
+      def html_body_single(xml_tree: XML.Tree, end_offset: Symbol.Offset): (XML.Body, Symbol.Offset) =
+        xml_tree match {
+          case XML.Wrapped_Elem(markup, _, body) => html_body_single(XML.Elem(markup, body), end_offset)
+          case XML.Elem(Markup(Markup.ENTITY, props @ Markup.Kind(kind)), body) =>
+            val (body1, offset) = html_body(body, end_offset)
+            if (elements.entity(kind)) {
+              make_ref(props, body1) match {
+                case Some(link) => (List(link), offset)
+                case None => (body1, offset)
+              }
+            }
+            else (body1, offset)
+          case XML.Elem(Markup.Path(file), body) =>
+            val (body1, offset) = html_body(body, end_offset)
+            make_file_ref(file, body1) match {
+              case Some(link) => (List(link), offset)
+              case None => (body1, offset)
+            }
+          case XML.Elem(Markup.Url(href), body) =>
+            val (body1, offset) = html_body(body, end_offset)
+            (List(HTML.link(href, body1)), offset)
+          case XML.Elem(Markup(Markup.LANGUAGE, Markup.Name(name)), body) =>
+            val (body1, offset) = html_body(body, end_offset)
+            (html_class(if (elements.language(name)) name else "", body1), offset)
+          case XML.Elem(Markup(Markup.MARKDOWN_PARAGRAPH, _), body) =>
+            val (body1, offset) = html_body(body, end_offset)
+            (List(HTML.par(body1)), offset)
+          case XML.Elem(Markup(Markup.MARKDOWN_ITEM, _), body) =>
+            val (body1, offset) = html_body(body, end_offset)
+            (List(HTML.item(body1)), offset)
+          case XML.Elem(Markup(Markup.Markdown_Bullet.name, _), text) =>
+            (Nil, end_offset - XML.symbol_length(text))
+          case XML.Elem(Markup.Markdown_List(kind), body) =>
+            val (body1, offset) = html_body(body, end_offset)
+            if (kind == Markup.ENUMERATE) (List(HTML.`enum`(body1)), offset)
+            else (List(HTML.list(body1)), offset)
+          case XML.Elem(markup, body) =>
+            val name = markup.name
+            val (body1, offset) = html_body(body, end_offset)
+            val html =
+              markup.properties match {
+                case Markup.Kind(kind) if kind == Markup.COMMAND || kind == Markup.KEYWORD =>
+                  html_class(kind, body1)
+                case _ =>
+                  body1
+              }
+            Rendering.foreground.get(name) orElse Rendering.text_color.get(name) match {
+              case Some(c) => (html_class(c.toString, html), offset)
+              case None => (html_class(name, html), offset)
+            }
+          case XML.Text(text) =>
+            val offset = end_offset - Symbol.length(text)
+            val body = HTML.text(Symbol.decode(text))
+            make_def(Text.Range(offset, end_offset), body) match {
+              case Some(body1) => (List(body1), offset)
+              case None => (body, offset)
+            }
+        }
+
+      html_body(xml, XML.symbol_length(xml) + 1)._1
+    }
+  }
+
+
+
+  /** build presentation **/
+
+  val session_graph_path: Path = Path.explode("session_graph.pdf")
+
+  def build_session(
+    context: Context,
+    session_context: Export.Session_Context,
+    progress: Progress = new Progress,
+  ): Unit = {
+    progress.expose_interrupt()
+
+    val session_name = session_context.session_name
+    val session_info = session_context.sessions_structure(session_name)
+
+    val session_dir = context.session_dir(session_name).expand
+    progress.echo("Presenting " + session_name + " in " + session_dir + " ...")
+
+    Meta_Info.init_directory(context.chapter_dir(session_name))
+    Meta_Info.clean_directory(session_dir)
+
+    val session = context.document_info.the_session(session_name)
+
+    Bytes.write(session_dir + session_graph_path,
+      graphview.Graph_File.make_pdf(session_info.options,
+        session_context.session_base.session_graph_display))
+
+    val document_variants =
+      for {
+        doc <- session_info.document_variants
+        db <- session_context.session_db()
+        document <- Document_Build.read_document(db, session_name, doc.name)
+      }
+      yield {
+        val doc_path = session_dir + doc.path.pdf
+        if (Path.eq_case_insensitive(doc.path.pdf, session_graph_path)) {
+          error("Illegal document variant " + quote(doc.name) +
+            " (conflict with " + session_graph_path + ")")
+        }
+        progress.echo("Presenting document " + session_name + "/" + doc.name, verbose = true)
+        if (session_info.document_echo) progress.echo("Document at " + doc_path)
+        Bytes.write(doc_path, document.pdf)
+        doc
+      }
+
+    val document_links = {
+      val link1 = HTML.link(session_graph_path, HTML.text("theory dependencies"))
+      val links2 = document_variants.map(doc => HTML.link(doc.path.pdf, HTML.text(doc.name)))
+      Library.separate(HTML.break ::: HTML.nl,
+        (link1 :: links2).map(link => HTML.text("View ") ::: List(link))).flatten
+    }
+
+    def present_theory(theory_name: String): XML.Body = {
+      progress.expose_interrupt()
+
+      def err(): Nothing =
+        error("Missing document information for theory: " + quote(theory_name))
+
+      val snapshot = Build.read_theory(session_context.theory(theory_name)) getOrElse err()
+      val theory = context.theory_by_name(session_name, theory_name) getOrElse err()
+
+      progress.echo("Presenting theory " + quote(theory_name), verbose = true)
+
+      val thy_elements = theory.elements(context.elements)
+
+      def node_context(file_name: String, node_dir: Path): Node_Context =
+        Node_Context.make(context, session_name, theory_name, file_name, node_dir)
+
+      val thy_html =
+        context.source(
+          node_context(theory.thy_file, session_dir).
+            make_html(thy_elements, snapshot.xml_markup(elements = thy_elements.html)))
+
+      val master_dir = Path.explode(snapshot.node_name.master_dir)
+
+      val files =
+        for {
+          blob_name <- snapshot.node_files.tail
+          xml = snapshot.switch(blob_name).xml_markup(elements = thy_elements.html)
+          if xml.nonEmpty
+        }
+        yield {
+          progress.expose_interrupt()
+
+          val file = blob_name.node
+          progress.echo("Presenting file " + quote(file), verbose = true)
+
+          val file_html = session_dir + context.file_html(file)
+          val file_dir = file_html.dir
+          val html_link = HTML.relative_href(file_html, base = Some(session_dir))
+          val html = context.source(node_context(file, file_dir).make_html(thy_elements, xml))
+
+          val path = Path.explode(file)
+          val src_path = File.relative_path(master_dir, path).getOrElse(path)
+
+          val file_title = "File " + Symbol.cartouche_decoded(src_path.implode_short)
+          HTML.write_document(file_dir, file_html.file_name,
+            List(HTML.title(file_title)), List(context.head(file_title), html),
+            root = Some(context.root_dir))
+          List(HTML.link(html_link, HTML.text(file_title)))
+        }
+
+      val thy_title = "Theory " + theory.print_short
+      HTML.write_document(session_dir, context.theory_html(theory).implode,
+        List(HTML.title(thy_title)), List(context.head(thy_title), thy_html),
+        root = Some(context.root_dir))
+
+      List(HTML.link(context.theory_html(theory),
+        HTML.text(theory.print_short) :::
+        (if (files.isEmpty) Nil else List(HTML.itemize(files)))))
+    }
+
+    val theories = session.used_theories.map(present_theory)
+
+    val title = "Session " + session_name
+      HTML.write_document(session_dir, "index.html",
+        List(HTML.title(title + Isabelle_System.isabelle_heading())),
+        context.head(title, List(HTML.par(document_links))) ::
+          context.contents("Theories", theories),
+        root = Some(context.root_dir))
+
+    Meta_Info.set_build_uuid(session_dir, session.build_uuid)
+
+    context.update_chapter(session_name, session_info.description)
+  }
+
+  def build(
+    browser_info: Config,
+    store: Store,
+    deps: Sessions.Deps,
+    sessions: List[String],
+    progress: Progress = new Progress,
+    server: SSH.Server = SSH.no_server
+  ): Unit = {
+    val root_dir = browser_info.presentation_dir(store).absolute
+    progress.echo("Presentation in " + root_dir)
+
+    using(Export.open_database_context(store, server = server)) { database_context =>
+      val context0 = context(deps.sessions_structure, root_dir = root_dir)
+
+      val sessions1 =
+        deps.sessions_structure.build_requirements(sessions).filter { session_name =>
+          using(database_context.open_database(session_name)) { session_database =>
+            database_context.store.read_build(session_database.db, session_name) match {
+              case None => false
+              case Some(build) =>
+                val session_dir = context0.session_dir(session_name)
+                !Meta_Info.check_build_uuid(session_dir, build.uuid)
+            }
+          }
+        }
+
+      val context1 =
+        context(deps.sessions_structure, root_dir = root_dir,
+          document_info = Document_Info.read(database_context, deps, sessions1))
+
+      context1.update_root()
+
+      Par_List.map({ (session: String) =>
+        using(database_context.open_session(deps.background(session))) { session_context =>
+          build_session(context1, session_context, progress = progress)
+        }
+      }, sessions1)
+    }
+  }
+}