Complete refactor to new routing API

src/main/kotlin/html5up/forty/common.kt

@@ -1,8 +1,7 @@
 package html5up.forty
 
 import kotlinx.html.*
-import space.kscience.snark.SiteData
+import space.kscience.snark.PageBuilder
-import space.kscience.snark.resolveRef
 
 
 internal fun FlowContent.fortyMenu() {
@@ -201,7 +200,7 @@ internal fun FlowContent.fortyFooter() {
     }
 }
 
-context(SiteData) internal fun BODY.fortyScripts() {
+context(PageBuilder) internal fun BODY.fortyScripts() {
     script {
         src = resolveRef("assets/js/jquery.min.js")
     }

src/main/kotlin/html5up/forty/landing.kt

@@ -1,9 +1,9 @@
 package html5up.forty
 
 import kotlinx.html.*
-import space.kscience.snark.SiteData
+import space.kscience.snark.PageBuilder
 
-context(SiteData) internal fun HTML.landing(){
+context(PageBuilder) internal fun HTML.landing(){
     head {
         title {
         }

src/main/kotlin/html5up/forty/page.kt

@@ -1,10 +1,9 @@
 package html5up.forty
 
 import kotlinx.html.*
-import space.kscience.snark.SiteData
+import space.kscience.snark.PageBuilder
-import space.kscience.snark.resolveRef
 
-context(SiteData) internal fun HTML.fortyPage(){
+context(PageBuilder) internal fun HTML.fortyPage(){
     head {
         title {
         }

src/main/kotlin/ru/mipt/spc/Application.kt

@@ -1,16 +1,14 @@
 package ru.mipt.spc
 
 import io.ktor.server.application.Application
-import io.ktor.server.application.install
 import io.ktor.server.application.log
-import io.ktor.server.plugins.httpsredirect.HttpsRedirect
 import kotlinx.css.CssBuilder
 import kotlinx.html.CommonAttributeGroupFacade
 import kotlinx.html.style
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.fetch
 import space.kscience.snark.SnarkPlugin
-import space.kscience.snark.site
+import space.kscience.snark.snarkSite
 import java.net.URI
 import java.nio.file.FileSystems
 import java.nio.file.Files
@@ -49,7 +47,7 @@ const val BUILD_DATE_FILE = "/buildDate"
 
 @Suppress("unused")
 fun Application.spcModule() {
-    install(HttpsRedirect)
+//    install(HttpsRedirect)
 
     val context = Context("spc-site") {
         plugin(SnarkPlugin)
@@ -65,7 +63,7 @@ fun Application.spcModule() {
 
     val inProduction: Boolean = environment.config.propertyOrNull("ktor.environment.production") != null
 
-    if(inProduction){
+    if (inProduction) {
         log.info("Production mode activated")
         log.info("Build date: $buildDate")
         log.info("Deploy date: $deployDate")
@@ -90,7 +88,7 @@ fun Application.spcModule() {
         dataPath.resolve(DEPLOY_DATE_FILE).writeText(date)
     }
 
-    snark.site {
+    snarkSite(snark) {
         val homeDataPath = resolveData(
             this@spcModule.javaClass.getResource("/home")!!.toURI(),
             dataPath / "home"

src/main/kotlin/ru/mipt/spc/master.kt

@@ -34,14 +34,14 @@ import kotlin.collections.set
 private val HtmlData.imagePath: String? get() = meta["image"]?.string ?: meta["image.path"].string
 private val HtmlData.name: String get() = meta["name"].string ?: error("Name not found")
 
-class MagProgSection(
+context(PageBuilder) class MagProgSection(
     val id: String,
     val title: String,
     val style: String,
     val content: FlowContent.() -> Unit,
 )
 
-private fun wrapSection(
+context(PageBuilder) private fun wrapSection(
     id: String,
     title: String,
     sectionContent: FlowContent.() -> Unit,
@@ -52,7 +52,7 @@ private fun wrapSection(
     }
 }
 
-private fun wrapSection(
+context(PageBuilder) private fun wrapSection(
     block: HtmlData,
     idOverride: String? = null,
 ): MagProgSection = wrapSection(
@@ -70,9 +70,9 @@ private val PROGRAM_PATH: Name = CONTENT_NODE_NAME + "program"
 private val RECOMMENDED_COURSES_PATH: Name = CONTENT_NODE_NAME + "recommendedCourses"
 private val PARTNERS_PATH: Name = CONTENT_NODE_NAME + "partners"
 
-context(SiteData) private fun FlowContent.programSection() {
+context(PageBuilder) private fun FlowContent.programSection() {
-    val programBlock = resolveHtml(PROGRAM_PATH)!!
+    val programBlock = data.resolveHtml(PROGRAM_PATH)!!
-    val recommendedBlock = resolveHtml(RECOMMENDED_COURSES_PATH)!!
+    val recommendedBlock = data.resolveHtml(RECOMMENDED_COURSES_PATH)!!
     div("inner") {
         h2 { +"Учебная программа" }
         htmlData(programBlock)
@@ -87,7 +87,7 @@ context(SiteData) private fun FlowContent.programSection() {
     }
 }
 
-context(SiteData) private fun FlowContent.partners() {
+context(PageBuilder) private fun FlowContent.partners() {
     //val partnersData: Meta = resolve<Any>(PARTNERS_PATH)?.meta ?: Meta.EMPTY
     val partnersData: Meta = runBlocking { data.getByType<Meta>(PARTNERS_PATH)?.await() } ?: Meta.EMPTY
     div("inner") {
@@ -117,8 +117,8 @@ context(SiteData) private fun FlowContent.partners() {
 //    val photo: String? by meta.string()
 //}
 
-context(SiteData) private fun FlowContent.team() {
+context(PageBuilder) private fun FlowContent.team() {
-    val team = findByType("magprog_team").values.sortedBy { it.order }
+    val team = data.findByContentType("magprog_team").values.sortedBy { it.order }
 
     div("inner") {
         h2 { +"Команда" }
@@ -172,8 +172,8 @@ context(SiteData) private fun FlowContent.team() {
 //    }
 }
 
-context(SiteData) private fun FlowContent.mentors() {
+context(PageBuilder) private fun FlowContent.mentors() {
-    val mentors = findByType("magprog_mentor").entries.sortedBy { it.value.id }
+    val mentors = data.findByContentType("magprog_mentor").entries.sortedBy { it.value.id }
 
     div("inner") {
         h2 {
@@ -183,7 +183,7 @@ context(SiteData) private fun FlowContent.mentors() {
     mentors.forEach { (name, mentor) ->
         section {
             id = mentor.id
-            val ref = resolvePage("mentor-${mentor.id}")
+            val ref = resolvePageRef("mentor-${mentor.id}")
             a(classes = "image", href = ref) {
                 mentor.imagePath?.let { photoPath ->
                     img(
@@ -200,7 +200,7 @@ context(SiteData) private fun FlowContent.mentors() {
                     h2 {
                         a(href = ref) { +mentor.name }
                     }
-                    val info = resolveHtml(name.withIndex("info"))
+                    val info = data.resolveHtml(name.withIndex("info"))
                     if (info != null) {
                         htmlData(info)
                     }
@@ -210,7 +210,7 @@ context(SiteData) private fun FlowContent.mentors() {
     }
 }
 
-context(SiteData) internal fun HTML.magProgHead(title: String) {
+context(PageBuilder) internal fun HTML.magProgHead(title: String) {
     head {
         this.title = title
         meta {
@@ -237,7 +237,7 @@ context(SiteData) internal fun HTML.magProgHead(title: String) {
     }
 }
 
-context(SiteData) internal fun BODY.magProgFooter() {
+context(PageBuilder) internal fun BODY.magProgFooter() {
     footer("wrapper style1-alt") {
         id = "footer"
         div("inner") {
@@ -282,13 +282,13 @@ internal fun SiteBuilder.spcMaster(dataPath: Path, prefix: Name = "magprog".asNa
 
     val magProgSiteContext = snark.readDirectory(dataPath.resolve("content"))
 
-    mountSite(prefix, magProgSiteContext) {
+    route(prefix, magProgSiteContext, setAsRoot = true) {
         assetDirectory("assets", dataPath.resolve("assets"))
         assetDirectory("images", dataPath.resolve("images"))
 
         page {
             val sections = listOf<MagProgSection>(
-                wrapSection(resolveHtml(INTRO_PATH)!!, "intro"),
+                wrapSection(data.resolveHtml(INTRO_PATH)!!, "intro"),
                 MagProgSection(
                     id = "partners",
                     title = "Партнеры",
@@ -311,12 +311,13 @@ internal fun SiteBuilder.spcMaster(dataPath: Path, prefix: Name = "magprog".asNa
                 ) {
                     programSection()
                 },
-                wrapSection(resolveHtml(ENROLL_PATH)!!, "enroll"),
+                wrapSection(data.resolveHtml(ENROLL_PATH)!!, "enroll"),
                 wrapSection(id = "contacts", title = "Контакты") {
-                    htmlData(resolveHtml(CONTACTS_PATH)!!)
+                    htmlData(data.resolveHtml(CONTACTS_PATH)!!)
                     team()
                 }
             )
+
             magProgHead("Магистратура \"Научное программирование\"")
             body("is-preload magprog-body") {
                 section {
@@ -355,9 +356,10 @@ internal fun SiteBuilder.spcMaster(dataPath: Path, prefix: Name = "magprog".asNa
                 magProgFooter()
             }
         }
+    }
 
 
-        val mentors = data.findByType("magprog_mentor").values.sortedBy {
+    val mentors = data.findByContentType("magprog_mentor").values.sortedBy {
         it.order
     }
 
@@ -377,7 +379,7 @@ internal fun SiteBuilder.spcMaster(dataPath: Path, prefix: Name = "magprog".asNa
                             mentors.forEach {
                                 li {
                                     a {
-                                            href = resolvePage(it.mentorPageId)
+                                        href = resolvePageRef(it.mentorPageId)
                                         +it.name.substringAfterLast(" ")
                                     }
                                 }
@@ -408,5 +410,4 @@ internal fun SiteBuilder.spcMaster(dataPath: Path, prefix: Name = "magprog".asNa
             }
         }
     }
-    }
 }

src/main/kotlin/ru/mipt/spc/spcCollection.kt

@@ -15,7 +15,7 @@ import kotlin.collections.component1
 import kotlin.collections.component2
 import kotlin.collections.set
 
-context(SiteData, FlowContent) private fun spcSpotlightContent(
+context(PageBuilder) private fun FlowContent.spcSpotlightContent(
     landing: HtmlData,
     content: Map<Name, HtmlData>,
 ) {
@@ -44,11 +44,11 @@ context(SiteData, FlowContent) private fun spcSpotlightContent(
         id = "main"
         //TODO add smart SNARK ordering
         section("spotlights") {
-            content.entries.sortedBy { it.value.meta["order"].int ?: Int.MAX_VALUE }.forEach { (name, data) ->
+            content.entries.sortedBy { it.value.meta["order"].int ?: Int.MAX_VALUE }.forEach { (name, entry) ->
-                val ref = resolvePage(name)
+                val ref = resolvePageRef(name)
                 section {
-                    id = data.meta["id"].string ?: name.toString()
+                    id = entry.meta["id"].string ?: name.toString()
-                    data.meta["image"]?.let { imageMeta: Meta ->
+                    entry.meta["image"]?.let { imageMeta: Meta ->
                         val imagePath =
                             imageMeta.value?.string ?: imageMeta["path"].string ?: error("Image path not provided")
                         a(classes = "image") {
@@ -63,11 +63,11 @@ context(SiteData, FlowContent) private fun spcSpotlightContent(
                     div("content") {
                         div("inner") {
                             header("major") {
-                                h3 { +(data.meta["title"].string ?: "???") }
+                                h3 { +(entry.meta["title"].string ?: "???") }
                             }
-                            val infoData = resolveHtml(name.withIndex("info"))
+                            val infoData = data.resolveHtml(name.withIndex("info"))
                             if (infoData == null) {
-                                htmlData(data)
+                                htmlData(entry)
                             } else {
                                 htmlData(infoData)
                             }

src/main/kotlin/ru/mipt/spc/spcHome.kt

@@ -15,7 +15,7 @@ import java.nio.file.Path
 import kotlin.reflect.typeOf
 
 
-context(SiteData) internal fun HTML.spcPageContent(
+context(PageBuilder) internal fun HTML.spcPageContent(
     meta: Meta,
     title: String = meta["title"].string ?: SPC_TITLE,
     fragment: FlowContent.() -> Unit,
@@ -65,7 +65,7 @@ internal val FortyDataRenderer: SiteBuilder.(Data<*>) -> Unit = { data ->
 }
 
 
-context(SiteData, HTML) private fun spcHome() {
+context(PageBuilder) private fun HTML.spcHome() {
     spcHead()
     body("is-preload") {
         wrapper {
@@ -150,7 +150,7 @@ context(SiteData, HTML) private fun spcHome() {
                         header("major") {
                             h3 {
                                 a(classes = "link") {
-                                    href = resolvePage("magprog")
+                                    href = resolvePageRef("magprog")
                                     +"""Master's program"""
                                 }
                             }
@@ -167,7 +167,7 @@ context(SiteData, HTML) private fun spcHome() {
                         header("major") {
                             h3 {
                                 a(classes = "link") {
-                                    href = resolvePage("research")
+                                    href = resolvePageRef("research")
                                     +"""Research"""
                                 }
                             }
@@ -186,7 +186,7 @@ context(SiteData, HTML) private fun spcHome() {
                         header("major") {
                             h3 {
                                 a(classes = "link") {
-                                    href = resolvePage("consulting")
+                                    href = resolvePageRef("consulting")
                                     +"""Consulting"""
                                 }
                             }
@@ -203,7 +203,7 @@ context(SiteData, HTML) private fun spcHome() {
                         header("major") {
                             h3 {
                                 a(classes = "link") {
-                                    href = resolvePage("team")
+                                    href = resolvePageRef("team")
                                     +"""Team"""
                                 }
                             }
@@ -256,7 +256,7 @@ internal fun SiteBuilder.spcHome(rootPath: Path, prefix: Name = Name.EMPTY) {
 
     val homePageData = snark.readDirectory(rootPath.resolve("content"))
 
-    mountSite(prefix, homePageData) {
+    route(prefix, homePageData, setAsRoot = true) {
         assetDirectory("assets", rootPath.resolve("assets"))
         assetDirectory("images", rootPath.resolve("images"))
 

src/main/kotlin/ru/mipt/spc/spcMisc.kt

@@ -1,15 +1,14 @@
 package ru.mipt.spc
 
 import kotlinx.html.*
-import space.kscience.snark.SiteData
+import space.kscience.snark.PageBuilder
 import space.kscience.snark.homeRef
-import space.kscience.snark.resolvePage
+import space.kscience.snark.resolvePageRef
-import space.kscience.snark.resolveRef
 
 
 internal const val SPC_TITLE = "Scientific Programming Centre"
 
-context(SiteData) internal fun HTML.spcHead(title: String = SPC_TITLE) {
+context(PageBuilder) internal fun HTML.spcHead(title: String = SPC_TITLE) {
     head {
         title {
             +title
@@ -28,7 +27,7 @@ context(SiteData) internal fun HTML.spcHead(title: String = SPC_TITLE) {
     }
 }
 
-context(SiteData) internal fun FlowContent.spcHomeMenu() {
+context(PageBuilder) internal fun FlowContent.spcHomeMenu() {
     nav {
         id = "menu"
         ul("links") {
@@ -40,25 +39,25 @@ context(SiteData) internal fun FlowContent.spcHomeMenu() {
             }
             li {
                 a {
-                    href = resolvePage("magprog")
+                    href = resolvePageRef("magprog")
                     +"""Master"""
                 }
             }
             li {
                 a {
-                    href = resolvePage("research")
+                    href = resolvePageRef("research")
                     +"""Research"""
                 }
             }
             li {
                 a {
-                    href = resolvePage("consulting")
+                    href = resolvePageRef("consulting")
                     +"""Consulting"""
                 }
             }
             li {
                 a {
-                    href = resolvePage("team")
+                    href = resolvePageRef("team")
                     +"""Team"""
                 }
             }
@@ -80,7 +79,7 @@ context(SiteData) internal fun FlowContent.spcHomeMenu() {
     }
 }
 
-context(SiteData) internal fun FlowContent.spcFooter() {
+context(PageBuilder) internal fun FlowContent.spcFooter() {
     footer {
         id = "footer"
         div("inner") {
@@ -130,7 +129,7 @@ context(SiteData) internal fun FlowContent.spcFooter() {
     }
 }
 
-context(SiteData) internal fun FlowContent.wrapper(contentBody: FlowContent.() -> Unit) {
+context(PageBuilder) internal fun FlowContent.wrapper(contentBody: FlowContent.() -> Unit) {
     div {
         id = "wrapper"
         // Header

src/main/kotlin/space/kscience/snark/KtorSiteBuilder.kt

@@ -7,7 +7,6 @@ import io.ktor.server.application.call
 import io.ktor.server.html.respondHtml
 import io.ktor.server.http.content.*
 import io.ktor.server.plugins.origin
-import io.ktor.server.request.ApplicationRequest
 import io.ktor.server.request.host
 import io.ktor.server.request.port
 import io.ktor.server.routing.Route
@@ -15,10 +14,23 @@ import io.ktor.server.routing.createRouteFromPath
 import io.ktor.server.routing.get
 import io.ktor.server.routing.routing
 import kotlinx.html.HTML
+import space.kscience.dataforge.context.Context
+import space.kscience.dataforge.data.DataTree
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.withDefault
 import space.kscience.dataforge.names.Name
 import java.nio.file.Path
+import kotlin.contracts.InvocationKind
+import kotlin.contracts.contract
 
-class KtorSiteBuilder(override val data: SiteData, private val ktorRoute: Route) : SiteBuilder {
+@PublishedApi
+internal class KtorSiteBuilder(
+    override val snark: SnarkPlugin,
+    override val data: DataTree<*>,
+    override val meta: Meta,
+    private val baseUrl: String,
+    private val ktorRoute: Route,
+) : SiteBuilder {
 
     override fun assetFile(remotePath: String, file: Path) {
         ktorRoute.file(remotePath, file.toFile())
@@ -30,17 +42,57 @@ class KtorSiteBuilder(override val data: SiteData, private val ktorRoute: Route)
         }
     }
 
-    override fun page(route: Name, content: context(SiteData, HTML)() -> Unit) {
+    private fun resolveRef(baseUrl: String, ref: String) = if (baseUrl.isEmpty()) {
+        ref
+    } else {
+        "${baseUrl.removeSuffix("/")}/$ref"
+    }
+
+    inner class KtorPageBuilder(
+        val pageBaseUrl: String,
+        override val meta: Meta = this@KtorSiteBuilder.meta,
+    ) : PageBuilder {
+        override val context: Context get() = this@KtorSiteBuilder.context
+        override val data: DataTree<*> get() = this@KtorSiteBuilder.data
+
+        override fun resolveRef(ref: String): String = resolveRef(pageBaseUrl, ref)
+
+        override fun resolvePageRef(pageName: Name): String = resolveRef(pageName.tokens.joinToString(separator = "/"))
+    }
+
+    override fun page(route: Name, content: context(PageBuilder, HTML)() -> Unit) {
         ktorRoute.get(route.toWebPath()) {
             call.respondHtml {
-                val dataWithUrl = data.copyWithRequestHost(call.request)
+                val request = call.request
-                content(dataWithUrl, this)
+                //substitute host for url for backwards calls
+                val url = URLBuilder(baseUrl).apply {
+                    protocol = URLProtocol.createOrDefault(request.origin.scheme)
+                    host = request.host()
+                    port = request.port()
+                }
+                val pageBuilder = KtorPageBuilder(url.buildString())
+                content(pageBuilder, this)
             }
         }
     }
 
-    override fun route(subRoute: Name): SiteBuilder =
+    override fun route(
-        KtorSiteBuilder(data, ktorRoute.createRouteFromPath(subRoute.toWebPath()))
+        routeName: Name,
+        dataOverride: DataTree<*>?,
+        metaOverride: Meta?,
+        setAsRoot: Boolean,
+    ): SiteBuilder = KtorSiteBuilder(
+        snark = snark,
+        data = dataOverride ?: data,
+        meta = metaOverride?.withDefault(meta) ?: meta,
+        baseUrl = if (setAsRoot) {
+            resolveRef(baseUrl, routeName.toWebPath())
+        } else {
+            baseUrl
+        },
+        ktorRoute = ktorRoute.createRouteFromPath(routeName.toWebPath())
+    )
+
 
     override fun assetResourceFile(remotePath: String, resourcesPath: String) {
         ktorRoute.resource(resourcesPath, resourcesPath)
@@ -49,39 +101,27 @@ class KtorSiteBuilder(override val data: SiteData, private val ktorRoute: Route)
     override fun assetResourceDirectory(resourcesPath: String) {
         ktorRoute.resources(resourcesPath)
     }
-
-    override fun withData(newData: SiteData): SiteBuilder = KtorSiteBuilder(newData, ktorRoute)
-}
-
-@PublishedApi
-internal fun SiteData.copyWithRequestHost(request: ApplicationRequest): SiteData {
-    val uri = URLBuilder(
-        protocol = URLProtocol.createOrDefault(request.origin.scheme),
-        host = request.host(),
-        port = request.port(),
-        pathSegments = baseUrlPath.split("/"),
-    )
-    return copy(baseUrlPath = uri.buildString())
 }
 
 inline fun Route.snarkSite(
-    data: SiteData,
+    snark: SnarkPlugin,
+    data: DataTree<*>,
+    meta: Meta = data.meta,
     block: SiteBuilder.() -> Unit,
 ) {
-    block(KtorSiteBuilder(data, this@snarkSite))
+    contract {
+        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
+    }
+    block(KtorSiteBuilder(snark, data, meta, "", this@snarkSite))
 }
 
 fun Application.snarkSite(
-    data: SiteData,
+    snark: SnarkPlugin,
+    data: DataTree<*> = DataTree.empty(),
+    meta: Meta = data.meta,
     block: SiteBuilder.() -> Unit,
 ) {
     routing {
-        snarkSite(data, block)
+        snarkSite(snark, data, meta, block)
     }
 }
-
-context (Application) fun SnarkPlugin.site(
-    block: SiteBuilder.() -> Unit,
-) {
-    snarkSite(SiteData.empty(this), block)
-}

src/main/kotlin/space/kscience/snark/PageBuilder.kt

@@ -0,0 +1,56 @@
+package space.kscience.snark
+
+import space.kscience.dataforge.context.ContextAware
+import space.kscience.dataforge.data.*
+import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.get
+import space.kscience.dataforge.meta.string
+import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.parseAsName
+import space.kscience.dataforge.names.plus
+import space.kscience.dataforge.names.startsWith
+
+internal fun Name.toWebPath() = tokens.joinToString(separator = "/")
+
+interface PageBuilder : ContextAware {
+    val data: DataTree<*>
+
+    val meta: Meta
+
+    fun resolveRef(ref: String): String
+
+    fun resolvePageRef(pageName: Name): String
+}
+
+
+fun PageBuilder.resolvePageRef(pageName: String) = resolvePageRef(pageName.parseAsName())
+
+val PageBuilder.homeRef get() = resolvePageRef(Name.EMPTY)
+
+/**
+ * Resolve a Html builder by its full name
+ */
+fun DataTree<*>.resolveHtml(name: Name): HtmlData? {
+    val resolved = (getByType<HtmlFragment>(name) ?: getByType<HtmlFragment>(name + SiteBuilder.INDEX_PAGE_TOKEN))
+
+    return resolved?.takeIf {
+        it.published //TODO add language confirmation
+    }
+}
+
+/**
+ * Find all Html blocks using given name/meta filter
+ */
+fun DataTree<*>.resolveAllHtml(predicate: (name: Name, meta: Meta) -> Boolean): Map<Name, HtmlData> =
+    filterByType<HtmlFragment> { name, meta ->
+        predicate(name, meta)
+                && meta["published"].string != "false"
+        //TODO add language confirmation
+    }.asSequence().associate { it.name to it.data }
+
+
+fun DataTree<*>.findByContentType(contentType: String, baseName: Name = Name.EMPTY) = resolveAllHtml { name, meta ->
+    name.startsWith(baseName) && meta["content_type"].string == contentType
+}
+
+internal val Data<*>.published: Boolean get() = meta["published"].string != "false"

src/main/kotlin/space/kscience/snark/SiteBuilder.kt

@@ -4,21 +4,28 @@ import kotlinx.html.HTML
 import space.kscience.dataforge.context.Context
 import space.kscience.dataforge.context.ContextAware
 import space.kscience.dataforge.data.DataTree
-import space.kscience.dataforge.meta.Laminate
+import space.kscience.dataforge.data.DataTreeItem
+import space.kscience.dataforge.meta.Meta
 import space.kscience.dataforge.names.Name
+import space.kscience.dataforge.names.NameToken
 import space.kscience.dataforge.names.parseAsName
 import java.nio.file.Path
+import kotlin.reflect.KType
+import kotlin.reflect.typeOf
 
-internal fun Name.toWebPath() = tokens.joinToString(separator = "/")
 
 /**
  * An abstraction, which is used to render sites to the different rendering engines
  */
 interface SiteBuilder : ContextAware {
 
-    val data: SiteData
+    val data: DataTree<*>
 
-    override val context: Context get() = data.context
+    val snark: SnarkPlugin
+
+    override val context: Context get() = snark.context
+
+    val meta: Meta
 
     fun assetFile(remotePath: String, file: Path)
 
@@ -28,39 +35,62 @@ interface SiteBuilder : ContextAware {
 
     fun assetResourceDirectory(resourcesPath: String)
 
-    fun page(route: Name = Name.EMPTY, content: context(SiteData, HTML) () -> Unit)
+    fun page(route: Name = Name.EMPTY, content: context(PageBuilder, HTML) () -> Unit)
 
     /**
-     * Create a new branch builder with replaced [data]
+     * Create a route with optional data tree override. For example one could use a subtree of the initial tree.
+     * By default, the same data tree is used for route
      */
-    fun withData(newData: SiteData): SiteBuilder
+    fun route(
+        routeName: Name,
+        dataOverride: DataTree<*>? = null,
+        metaOverride: Meta? = null,
+        setAsRoot: Boolean = false,
+    ): SiteBuilder
 
-    /**
+    companion object {
-     * Create a route
+        val INDEX_PAGE_TOKEN: NameToken = NameToken("index")
-     */
-    fun route(subRoute: Name): SiteBuilder
-}
-
-val SiteBuilder.snark get() = data.snark
-
-public inline fun SiteBuilder.route(route: Name, block: SiteBuilder.() -> Unit) {
-    route(route).apply(block)
-}
-
-public inline fun SiteBuilder.route(route: String, block: SiteBuilder.() -> Unit) {
-    route(route.parseAsName()).apply(block)
-}
-
-/**
- * Create a stand-alone site at a given node
- */
-public fun SiteBuilder.mountSite(route: Name, dataRoot: DataTree<*>, block: SiteBuilder.() -> Unit) {
-    val mountedData = data.copy(
-        data = dataRoot,
-        baseUrlPath = data.resolveRef(route.tokens.joinToString(separator = "/")),
-        meta = Laminate(dataRoot.meta, data.meta) //layering dataRoot meta over existing data
-    )
-    route(route) {
-        withData(mountedData).block()
     }
 }
+
+public inline fun SiteBuilder.route(
+    route: Name,
+    dataOverride: DataTree<*>? = null,
+    metaOverride: Meta? = null,
+    setAsRoot: Boolean = false,
+    block: SiteBuilder.() -> Unit,
+) {
+    route(route, dataOverride, metaOverride, setAsRoot).apply(block)
+}
+
+public inline fun SiteBuilder.route(
+    route: String,
+    dataOverride: DataTree<*>? = null,
+    metaOverride: Meta? = null,
+    setAsRoot: Boolean = false,
+    block: SiteBuilder.() -> Unit,
+) {
+    route(route.parseAsName(), dataOverride, metaOverride, setAsRoot).apply(block)
+}
+
+
+///**
+// * Create a stand-alone site at a given node
+// */
+//public fun SiteBuilder.site(route: Name, dataRoot: DataTree<*>, block: SiteBuilder.() -> Unit) {
+//    val mountedData = data.copy(
+//        data = dataRoot,
+//        baseUrlPath = data.resolveRef(route.tokens.joinToString(separator = "/")),
+//        meta = Laminate(dataRoot.meta, data.meta) //layering dataRoot meta over existing data
+//    )
+//    route(route) {
+//        withData(mountedData).block()
+//    }
+//}
+
+//TODO move to DF
+fun DataTree.Companion.empty(meta: Meta = Meta.EMPTY) = object : DataTree<Any> {
+    override val items: Map<NameToken, DataTreeItem<Any>> get() = emptyMap()
+    override val dataType: KType get() = typeOf<Any>()
+    override val meta: Meta get() = meta
+}

src/main/kotlin/space/kscience/snark/SiteData.kt

@@ -1,102 +0,0 @@
-package space.kscience.snark
-
-import space.kscience.dataforge.context.Context
-import space.kscience.dataforge.context.ContextAware
-import space.kscience.dataforge.data.*
-import space.kscience.dataforge.meta.Meta
-import space.kscience.dataforge.meta.get
-import space.kscience.dataforge.meta.string
-import space.kscience.dataforge.names.*
-import space.kscience.snark.SiteData.Companion.INDEX_PAGE_TOKEN
-import kotlin.reflect.KType
-import kotlin.reflect.typeOf
-
-data class SiteData(
-    val snark: SnarkPlugin,
-    val data: DataTree<*>,
-    val baseUrlPath: String,
-    override val meta: Meta,
-) : ContextAware, DataTree<Any> by data {
-
-    override val context: Context get() = snark.context
-
-    val language: String? by meta.string()
-
-    companion object {
-        fun empty(
-            snark: SnarkPlugin,
-            baseUrlPath: String = "",
-            meta: Meta = Meta.EMPTY,
-        ): SiteData {
-            //TODO use empty data from DF
-            val emptyData = object : DataTree<Any> {
-                override val items: Map<NameToken, DataTreeItem<Any>> get() = emptyMap()
-                override val dataType: KType get() = typeOf<Any>()
-                override val meta: Meta get() = meta
-            }
-            return SiteData(snark, emptyData, baseUrlPath, meta)
-        }
-
-        val INDEX_PAGE_TOKEN: NameToken = NameToken("index")
-    }
-}
-
-/**
- * Resolve a resource full path by its name
- */
-fun SiteData.resolveRef(name: String): String = if (baseUrlPath.isEmpty()) {
-    name
-} else {
-    "${baseUrlPath.removeSuffix("/")}/$name"
-}
-
-/**
- * Resolve a page designated by given name. Depending on rendering specifics, some prefixes or suffixes could be added.
- */
-fun SiteData.resolvePage(name: Name): String {
-    return resolveRef(name.tokens.joinToString("/")) + (meta["pageSuffix"].string ?: "")
-}
-
-/**
- *
- */
-fun SiteData.resolvePage(name: String): String = resolvePage(name.parseAsName())
-
-val SiteData.homeRef get() = resolvePage(Name.EMPTY)
-
-/**
- * Resolve a Html builder by its full name
- */
-fun DataTree<*>.resolveHtml(name: Name): HtmlData? {
-    val resolved = (getByType<HtmlFragment>(name) ?: getByType<HtmlFragment>(name + INDEX_PAGE_TOKEN))
-
-    return resolved?.takeIf {
-        it.published //TODO add language confirmation
-    }
-}
-
-/**
- * Find all Html blocks using given name/meta filter
- */
-fun DataTree<*>.resolveAllHtml(predicate: (name: Name, meta: Meta) -> Boolean): Map<Name, HtmlData> =
-    filterByType<HtmlFragment> { name, meta ->
-        predicate(name, meta)
-                && meta["published"].string != "false"
-        //TODO add language confirmation
-    }.asSequence().associate { it.name to it.data }
-
-
-fun SiteData.findByType(contentType: String, baseName: Name = Name.EMPTY) = resolveAllHtml { name, meta ->
-    name.startsWith(baseName) && meta["content_type"].string == contentType
-}
-
-internal val Data<*>.published: Boolean get() = meta["published"].string != "false"
-//
-//fun SnarkPlugin.readData(data: DataTree<*>, rootUrl: String = "/"): SiteData =
-//    SiteData(this, data, rootUrl)
-//
-//fun SnarkPlugin.readDirectory(path: Path, rootUrl: String = "/"): SiteData {
-//    val parsedData: DataTree<Any> = readDirectory(path)
-//
-//    return readData(parsedData, rootUrl)
-//}

src/main/kotlin/space/kscience/snark/SiteLayout.kt

@@ -60,7 +60,7 @@ fun SiteBuilder.pages(
     val layoutMeta = data.meta[LAYOUT_KEY]
     if (layoutMeta != null) {
         //use layout if it is defined
-        this.data.snark.layout(layoutMeta).render(data)
+        snark.layout(layoutMeta).render(data)
     } else {
         when (data) {
             is DataTreeItem.Node -> {

src/main/kotlin/space/kscience/snark/StaticSiteBuilder.kt

@@ -3,19 +3,30 @@ package space.kscience.snark
 import kotlinx.html.HTML
 import kotlinx.html.html
 import kotlinx.html.stream.createHTML
+import space.kscience.dataforge.context.Context
+import space.kscience.dataforge.data.DataTree
 import space.kscience.dataforge.meta.Meta
+import space.kscience.dataforge.meta.withDefault
 import space.kscience.dataforge.names.Name
 import space.kscience.dataforge.names.isEmpty
 import java.nio.file.Files
 import java.nio.file.Path
+import kotlin.contracts.InvocationKind
+import kotlin.contracts.contract
 import kotlin.io.path.*
 
 
-class StaticSiteBuilder(override val data: SiteData, private val path: Path) : SiteBuilder {
+internal class StaticSiteBuilder(
+    override val snark: SnarkPlugin,
+    override val data: DataTree<*>,
+    override val meta: Meta,
+    private val baseUrl: String,
+    private val path: Path,
+) : SiteBuilder {
     private fun Path.copyRecursively(target: Path) {
         Files.walk(this).forEach { source: Path ->
             val destination: Path = target.resolve(source.relativeTo(this))
-            if(!destination.isDirectory()) {
+            if (!destination.isDirectory()) {
                 //avoid re-creating directories
                 source.copyTo(destination, true)
             }
@@ -37,7 +48,7 @@ class StaticSiteBuilder(override val data: SiteData, private val path: Path) : S
     override fun assetResourceFile(remotePath: String, resourcesPath: String) {
         val targetPath = path.resolve(remotePath)
         targetPath.parent.createDirectories()
-        javaClass.getResource(resourcesPath)?.let { Path.of(it.toURI()) }?.copyTo(targetPath,true)
+        javaClass.getResource(resourcesPath)?.let { Path.of(it.toURI()) }?.copyTo(targetPath, true)
     }
 
     override fun assetResourceDirectory(resourcesPath: String) {
@@ -45,11 +56,27 @@ class StaticSiteBuilder(override val data: SiteData, private val path: Path) : S
         javaClass.getResource(resourcesPath)?.let { Path.of(it.toURI()) }?.copyRecursively(path)
     }
 
-    override fun page(route: Name, content: context(SiteData, HTML) () -> Unit) {
+    inner class StaticPageBuilder : PageBuilder {
+        override val data: DataTree<*> get() = this@StaticSiteBuilder.data
+        override val meta: Meta get() = this@StaticSiteBuilder.meta
+        override val context: Context get() = this@StaticSiteBuilder.context
+
+
+        override fun resolveRef(ref: String): String {
+            TODO("Not yet implemented")
+        }
+
+        override fun resolvePageRef(pageName: Name): String {
+            TODO("Not yet implemented")
+        }
+    }
+
+
+    override fun page(route: Name, content: context(PageBuilder, HTML) () -> Unit) {
         val htmlBuilder = createHTML()
 
         htmlBuilder.html {
-            content(data, this)
+            content(StaticPageBuilder(), this)
         }
 
         val newPath = if (route.isEmpty()) {
@@ -62,19 +89,23 @@ class StaticSiteBuilder(override val data: SiteData, private val path: Path) : S
         newPath.writeText(htmlBuilder.finalize())
     }
 
-    override fun route(subRoute: Name): SiteBuilder = StaticSiteBuilder(data, path.resolve(subRoute.toWebPath()))
+    override fun route(
-
+        routeName: Name,
-    override fun withData(newData: SiteData): SiteBuilder = StaticSiteBuilder(newData, path)
+        dataOverride: DataTree<*>?,
-
+        metaOverride: Meta?,
-}
+        setAsRoot: Boolean,
-
+    ): SiteBuilder = StaticSiteBuilder(
-fun SnarkPlugin.static(path: Path, block: SiteBuilder.() -> Unit) {
+        snark = snark,
-    val base = SiteData.empty(
+        data = dataOverride ?: data,
-        this,
+        meta = metaOverride?.withDefault(meta) ?: meta,
-        baseUrlPath = path.absolutePathString(),
+        baseUrl = baseUrl,
-        meta = Meta {
+        path = path.resolve(routeName.toWebPath())
-            "pageSuffix" put ".html"
-        }
     )
-    StaticSiteBuilder(base, path).block()
+}
+
+fun SnarkPlugin.static(outputPath: Path, data: DataTree<*> = DataTree.empty(), block: SiteBuilder.() -> Unit) {
+    contract {
+        callsInPlace(block, InvocationKind.EXACTLY_ONCE)
+    }
+    StaticSiteBuilder(this, data, meta, "", outputPath).block()
 }