1 files changed, 122 insertions, 0 deletions
diff --git a/src/client/util/History.ts b/src/client/util/History.ts
new file mode 100644
index 000000000..92d2b2b44
--- /dev/null
+++ b/src/client/util/History.ts
@@ -0,0 +1,122 @@
+import { Doc, Opt, Field } from "../../new_fields/Doc";
+import { DocServer } from "../DocServer";
+import { Main } from "../views/Main";
+import { RouteStore } from "../../server/RouteStore";
+
+export namespace HistoryUtil {
+    export interface DocInitializerList {
+        [key: string]: string | number;
+    }
+
+    export interface DocUrl {
+        type: "doc";
+        docId: string;
+        initializers: {
+            [docId: string]: DocInitializerList;
+        };
+    }
+
+    export type ParsedUrl = DocUrl;
+
+    // const handlers: ((state: ParsedUrl | null) => void)[] = [];
+    function onHistory(e: PopStateEvent) {
+        if (window.location.pathname !== RouteStore.home) {
+            const url = e.state as ParsedUrl || parseUrl(window.location.pathname);
+            if (url) {
+                switch (url.type) {
+                    case "doc":
+                        onDocUrl(url);
+                        break;
+                }
+            }
+        }
+        // for (const handler of handlers) {
+        //     handler(e.state);
+        // }
+    }
+
+    export function pushState(state: ParsedUrl) {
+        history.pushState(state, "", createUrl(state));
+    }
+
+    export function replaceState(state: ParsedUrl) {
+        history.replaceState(state, "", createUrl(state));
+    }
+
+    function copyState(state: ParsedUrl): ParsedUrl {
+        return JSON.parse(JSON.stringify(state));
+    }
+
+    export function getState(): ParsedUrl {
+        return copyState(history.state);
+    }
+
+    // export function addHandler(handler: (state: ParsedUrl | null) => void) {
+    //     handlers.push(handler);
+    // }
+
+    // export function removeHandler(handler: (state: ParsedUrl | null) => void) {
+    //     const index = handlers.indexOf(handler);
+    //     if (index !== -1) {
+    //         handlers.splice(index, 1);
+    //     }
+    // }
+
+    export function parseUrl(pathname: string): ParsedUrl | undefined {
+        let pathnameSplit = pathname.split("/");
+        if (pathnameSplit.length !== 2) {
+            return undefined;
+        }
+        const type = pathnameSplit[0];
+        const data = pathnameSplit[1];
+
+        if (type === "doc") {
+            const s = data.split("?");
+            if (s.length < 1 || s.length > 2) {
+                return undefined;
+            }
+            const docId = s[0];
+            const initializers = s.length === 2 ? JSON.parse(decodeURIComponent(s[1])) : {};
+            return {
+                type: "doc",
+                docId,
+                initializers
+            };
+        }
+
+        return undefined;
+    }
+
+    export function createUrl(params: ParsedUrl): string {
+        let baseUrl = DocServer.prepend(`/${params.type}`);
+        switch (params.type) {
+            case "doc":
+                const initializers = encodeURIComponent(JSON.stringify(params.initializers));
+                const id = params.docId;
+                let url = baseUrl + `/${id}`;
+                if (Object.keys(params.initializers).length) {
+                    url += `?${initializers}`;
+                }
+                return url;
+        }
+        return "";
+    }
+
+    export async function initDoc(id: string, initializer: DocInitializerList) {
+        const doc = await DocServer.GetRefField(id);
+        if (!(doc instanceof Doc)) {
+            return;
+        }
+        Doc.assign(doc, initializer);
+    }
+
+    async function onDocUrl(url: DocUrl) {
+        const field = await DocServer.GetRefField(url.docId);
+        await Promise.all(Object.keys(url.initializers).map(id => initDoc(id, url.initializers[id])));
+        if (field instanceof Doc) {
+            Main.Instance.openWorkspace(field, true);
+        }
+    }
+
+    window.onpopstate = onHistory;
+}