Initial

7 files changed, 1872 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..44761ab
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
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diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..87d4808
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1375 @@
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+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
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+      }
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+      "requires": {
+        "call-bind": "^1.0.0",
+        "get-intrinsic": "^1.0.2",
+        "object-inspect": "^1.9.0"
+      }
+    },
+    "socket.io": {
+      "version": "4.5.1",
+      "resolved": "https://registry.npmjs.org/socket.io/-/socket.io-4.5.1.tgz",
+      "integrity": "sha512-0y9pnIso5a9i+lJmsCdtmTTgJFFSvNQKDnPQRz28mGNnxbmqYg2QPtJTLFxhymFZhAIn50eHAKzJeiNaKr+yUQ==",
+      "requires": {
+        "accepts": "~1.3.4",
+        "base64id": "~2.0.0",
+        "debug": "~4.3.2",
+        "engine.io": "~6.2.0",
+        "socket.io-adapter": "~2.4.0",
+        "socket.io-parser": "~4.0.4"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "4.3.4",
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+          "requires": {
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+          }
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+        }
+      }
+    },
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+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/socket.io-adapter/-/socket.io-adapter-2.4.0.tgz",
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+    },
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+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/socket.io-parser/-/socket.io-parser-4.0.5.tgz",
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+      "requires": {
+        "@types/component-emitter": "^1.2.10",
+        "component-emitter": "~1.3.0",
+        "debug": "~4.3.1"
+      },
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+          }
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+        }
+      }
+    },
+    "statuses": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.1.tgz",
+      "integrity": "sha512-RwNA9Z/7PrK06rYLIzFMlaF+l73iwpzsqRIFgbMLbTcLD6cOao82TaWefPXQvB2fOC4AjuYSEndS7N/mTCbkdQ=="
+    },
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+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
+      "integrity": "sha512-o5sSPKEkg/DIQNmH43V0/uerLrpzVedkUh8tGNvaeXpfpuwjKenlSox/2O/BTlZUtEe+JG7s5YhEz608PlAHRA=="
+    },
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+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
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+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
+    "unpipe": {
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+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
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+    },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
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+    },
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+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha512-BNGbWLfd0eUPabhkXUVm0j8uuvREyTh5ovRa/dyow/BqAbZJyC+5fU+IzQOzmAKzYqYRAISoRhdQr3eIZ/PXqg=="
+    },
+    "ws": {
+      "version": "8.2.3",
+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.2.3.tgz",
+      "integrity": "sha512-wBuoj1BDpC6ZQ1B7DWQBYVLphPWkm8i9Y0/3YdHjHKHiohOJ1ws+3OccDWtH+PoC9DZD5WOTrJvNbWvjS6JWaA==",
+      "requires": {}
+    }
+  }
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..33c1df8
--- /dev/null
+++ b/package.json
@@ -0,0 +1,15 @@
+{
+  "name": "list-screen",
+  "version": "1.0.0",
+  "description": "Interactive list editor during a presentation",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "Tom Smeding",
+  "license": "MIT",
+  "dependencies": {
+    "express": "^4.18.1",
+    "socket.io": "^4.5.1"
+  }
+}
diff --git a/server.js b/server.js
new file mode 100755
index 0000000..21d9094
--- /dev/null
+++ b/server.js
@@ -0,0 +1,180 @@
+#!/usr/bin/env node
+const express = require("express");
+const http = require("http");
+const socketio = require("socket.io");
+const fs = require("fs");
+
+const [DBFILE, PORT] = (() => {
+  if (process.argv.length == 3) {
+    return [process.argv[2], 8000];
+  } else if (process.argv.length == 4) {
+    return [process.argv[2], +process.argv[3]];
+  } else {
+    console.log("Usage: ./server.js <dbfile.txt> [port]");
+    process.exit(1);
+  }
+})();
+
+const app = express();
+const httpServer = http.Server(app);
+const io = socketio(httpServer);
+
+const STATIC = __dirname + "/static";
+
+
+// ------------------------------
+//           "database"
+// ------------------------------
+
+class Database {
+  #filename;
+  #list;
+  #lastbackup;
+
+  constructor(filename) {
+    this.#filename = filename;
+    this.#list = JSON.parse(fs.readFileSync(this.#filename));
+    this.#lastbackup = new Date();
+  }
+
+  add_new(string) {
+    for (let i = 0; i < this.#list.length; i++) {
+      if (this.#list[i][1] == string) {
+        return "already existed";
+      }
+    }
+
+    this.#list.push([0, string]);
+    this.#sort();
+    this.#persist();
+
+    return null;
+  }
+
+  set_votes(string, votes) {
+    for (let i = 0; i < this.#list.length; i++) {
+      if (this.#list[i][1] == string) {
+        this.#list[i][0] = votes;
+        this.#sort();
+        this.#persist();
+        return null;
+      }
+    }
+
+    return `'${string}' does not exist`;
+  }
+
+  remove(string) {
+    for (let i = 0; i < this.#list.length; i++) {
+      if (this.#list[i][1] == string) {
+        this.#list.splice(i, 1);
+        this.#persist();
+        return null;
+      }
+    }
+
+    return "does not exist";
+  }
+
+  get() {
+    return this.#list;
+  }
+
+  #sort() {
+    this.#list.sort((a, b) => {
+      if (a[0] != b[0]) return b[0] - a[0];
+      if (a[1] < b[1]) return -1;
+      if (a[1] > b[1]) return 1;
+      return 0;
+    });
+  }
+
+  #persist() {
+    fs.writeFile(this.#filename, JSON.stringify(this.#list), err => {
+      if (err != null) {
+        console.error("Error writing to file:", err);
+        console.log(JSON.stringify(this.#list));
+      }
+    });
+
+    const now = new Date();
+    if (now - this.#lastbackup > 60 * 1000) {
+      const dotidx = this.#filename.lastIndexOf(".");
+      const bakfname =
+        dotidx == -1
+          ? this.#filename + now.getTime()
+          : this.#filename.slice(0, dotidx) + "." + now.getTime() + this.#filename.slice(dotidx);
+      fs.writeFile(bakfname, JSON.stringify(this.#list), err => {
+        if (err != null) {
+          console.error("Error copying to backup file:", err);
+        } else {
+          console.log(`Copied to ${bakfname}`);
+        }
+      });
+
+      this.#lastbackup = now;
+    }
+  }
+};
+
+const database = new Database(DBFILE);
+
+
+// ------------------------------
+//         Express routes
+// ------------------------------
+
+app.use(express.static(STATIC));
+
+app.get("/", (req, res) => {
+    res.sendFile(STATIC + "/index.html");
+});
+
+
+// ------------------------------
+//       socket.io bindings
+// ------------------------------
+
+let next_socket_id = 1;
+let num_connected = 0;
+
+io.on("connection", socket => {
+  const socket_id = next_socket_id++;
+  if (++num_connected >= 2) {
+    socket.emit("alert", `You're user number ${num_connected}, multi-user settings will mess up!`);
+  }
+  console.log(`new socket connection id=${socket_id} (nc=${num_connected})`);
+
+  socket.on("disconnect", () => {
+    num_connected--;
+    console.log(`disconnect id=${socket_id} (nc=${num_connected})`);
+  });
+
+  socket.on("new", string => {
+    const res = database.add_new(string);
+    if (res != null) socket.emit("error", res);
+  });
+
+  socket.on("set_votes", (string, votes) => {
+    const res = database.set_votes(string, votes);
+    if (res != null) socket.emit("error", res);
+  });
+
+  socket.on("delete", string =>{
+    const res = database.remove(string);
+    if (res != null) socket.emit("error", res);
+  });
+
+  socket.emit("init", database.get());
+});
+
+
+// ------------------------------
+//             setup
+// ------------------------------
+
+const server = httpServer.listen(PORT, () => {
+	const host = server.address().address;
+	const port = server.address().port;
+	console.log("Server listening at http://" + host + ":" + port);
+});
diff --git a/static/index.css b/static/index.css
new file mode 100644
index 0000000..1d1c542
--- /dev/null
+++ b/static/index.css
@@ -0,0 +1,91 @@
+body {
+  font-family: sans-serif;
+}
+
+#list {
+  font-size: 30px;
+}
+
+.item {
+  margin-bottom: 4px;
+}
+
+.item.flash {
+  background-color: #fdd;
+}
+
+.item.negative {
+  color: #999;
+}
+
+.item.make-new {
+  margin-top: 7px;
+}
+
+.item .item-buttons {
+  display: none;
+  user-select: none;
+}
+.item:hover .item-buttons {
+  display: inline;
+}
+
+.item-bullet {
+  color: #444;
+  user-select: none;
+  margin-right: 10px;
+}
+.item.negative .item-bullet {
+  color: #aaa;
+}
+
+.item-votes {
+  display: inline-block;
+  font-size: 18px;
+  color: #444;
+  vertical-align: 3px;
+  margin-left: 15px;
+}
+
+.item-upvote {
+  border: 1px #888 solid;
+  border-radius: 4px;
+  background-color: #eee;
+  color: green;
+  font-weight: bold;
+  cursor: pointer;
+  margin-left: 15px;
+  padding-left: 8px;
+  padding-right: 8px;
+}
+
+.item-downvote {
+  font-size: 23px;
+  color: blue;
+  cursor: pointer;
+  margin-left: 15px;
+  vertical-align: 2px;
+}
+
+.item-delete {
+  font-weight: bold;
+  font-family: mononoki;
+  color: #f00;
+  font-size: 28px;
+  margin-left: 11px;
+  cursor: pointer;
+}
+
+.new-item-bullet {
+  color: #888;
+  font-weight: bold;
+  font-family: mononoki;
+  margin-left: 1px;
+  margin-right: 8px;
+  user-select: none;
+  vertical-align: 1px;
+}
+
+.new-item-input {
+  font-size: 26px;
+}
diff --git a/static/index.html b/static/index.html
new file mode 100644
index 0000000..67ba2f8
--- /dev/null
+++ b/static/index.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html>
+<head>
+<meta charset="utf-8">
+<title>List</title>
+<script src="/socket.io/socket.io.js"></script>
+<script src="/index.js"></script>
+<link rel="stylesheet" href="/index.css">
+</head>
+<body>
+  <div id="list"></div>
+</body>
+</html>
diff --git a/static/index.js b/static/index.js
new file mode 100644
index 0000000..23d53ea
--- /dev/null
+++ b/static/index.js
@@ -0,0 +1,196 @@
+var socket = null;
+var is_initialised = false;
+var glist = [];  // [(int, string, element)]
+var el_list = null;
+
+function setupSocket() {
+  socket = io();
+
+  socket.on("init", function(list) {
+    // Reload if server restarted
+    if (!is_initialised) is_initialised = true;
+    else { location.reload(); return; }
+
+    glist = list;
+    for (var i = 0; i < glist.length; i++) glist[i].push(null);
+    initialiseList();
+  });
+
+  socket.on("error", function(err) {
+    alert("Error: " + err);
+  });
+
+  socket.on("alert", function(text) {
+    alert(text);
+  });
+}
+
+// Returns element
+function createItemElement(votes, string) {
+  var el;
+
+  var el_item = document.createElement("div");
+  el_item.classList.add("item");
+  if (votes < 0) el_item.classList.add("negative");
+
+  el = document.createElement("span");
+  el.classList.add("item-bullet");
+  el.appendChild(document.createTextNode("•"));
+  el_item.appendChild(el);
+
+  el = document.createElement("span");
+  el.classList.add("item-label");
+  el.appendChild(document.createTextNode(string));
+  el_item.appendChild(el);
+
+  el = document.createElement("span");
+  el.classList.add("item-votes");
+  el.appendChild(document.createTextNode("[" + votes + "]"));
+  el_item.appendChild(el);
+
+  var buttons = document.createElement("span");
+  buttons.classList.add("item-buttons");
+
+  el = document.createElement("span");
+  el.classList.add("item-upvote");
+  el.appendChild(document.createTextNode("⇧"));
+  el.addEventListener("click", function() {
+    upvoteItem(string, 1);
+  });
+  buttons.appendChild(el);
+
+  el = document.createElement("span");
+  el.classList.add("item-downvote");
+  el.appendChild(document.createTextNode("↓"));
+  el.addEventListener("click", function() {
+    upvoteItem(string, -1);
+  });
+  buttons.appendChild(el);
+
+  el = document.createElement("span");
+  el.classList.add("item-delete");
+  el.appendChild(document.createTextNode("⨯"));
+  el.addEventListener("click", function() {
+    if (votes < 0) deleteItem(string);
+    else negateItem(string);
+  });
+  buttons.appendChild(el);
+
+  el_item.appendChild(buttons);
+
+  return el_item;
+}
+
+function initialiseList() {
+  var el_item, el;
+  el_list.innerHTML = "";
+
+  for (var i = 0; i < glist.length; i++) {
+    el_item = createItemElement(glist[i][0], glist[i][1]);
+    glist[i][2] = el_item;
+    el_list.appendChild(el_item);
+  }
+
+  el_item = document.createElement("div");
+  el_item.classList.add("item");
+  el_item.classList.add("make-new");
+
+  el = document.createElement("span");
+  el.classList.add("new-item-bullet");
+  el.appendChild(document.createTextNode("+"));
+  el_item.appendChild(el);
+
+  el = document.createElement("input");
+  el.type = "text";
+  el.setAttribute("size", 21);
+  el.setAttribute("placeholder", "New item...");
+  el.classList.add("new-item-input");
+  el.addEventListener("keypress", function(ev) {
+    if (ev.key == "Enter" || ev.keyCode == 10 || ev.keyCode == 13) {
+      submitNewItem(ev.target.value);
+      ev.target.value = "";
+    }
+  });
+  el_item.appendChild(el);
+
+  el_list.appendChild(el_item);
+}
+
+function submitNewItem(string) {
+  for (var i = 0; i < glist.length; i++) {
+    if (glist[i][1] == string) {
+      var el = glist[i][2];
+      el.classList.add("flash");
+      setTimeout(function(i) { el.classList.remove("flash"); }, 200);
+      return;
+    }
+  }
+
+  socket.emit("new", string);
+
+  insertItem(0, string);
+}
+
+function upvoteItem(string, incr) {
+  for (var i = 0; i < glist.length; i++) {
+    if (glist[i][1] == string) {
+      glist[i][0] += incr;
+      socket.emit("set_votes", string, glist[i][0]);
+      reinsertItem(i);
+      break;
+    }
+  }
+}
+
+function negateItem(string) {
+  for (var i = 0; i < glist.length; i++) {
+    if (glist[i][1] == string) {
+      glist[i][0] = -1;
+      socket.emit("set_votes", string, -1);
+      reinsertItem(i);
+      break;
+    }
+  }
+}
+
+function deleteItem(string) {
+  for (var i = 0; i < glist.length; i++) {
+    if (glist[i][1] == string) {
+      socket.emit("delete", string);
+      glist[i][2].parentElement.removeChild(glist[i][2]);
+      glist.splice(i, 1);
+      break;
+    }
+  }
+}
+
+function insertItem(votes, string) {
+  var i;
+  for (i = 0; i < glist.length; i++) {
+    if (glist[i][0] > votes) continue;
+    if (glist[i][0] < votes || glist[i][1] > string) break;
+  }
+  var el = createItemElement(votes, string);
+  if (i == glist.length) {
+    glist.push([votes, string, el]);
+    el_list.insertBefore(el, document.querySelector(".item.make-new"));
+  } else {
+    var refel = glist[i][2];
+    glist.splice(i, 0, [votes, string, el]);
+    el_list.insertBefore(el, refel);
+  }
+}
+
+function reinsertItem(index) {
+  glist[index][2].parentElement.removeChild(glist[index][2]);
+  var votes = glist[index][0];
+  var string = glist[index][1];
+  glist.splice(index, 1);
+
+  insertItem(votes, string);
+}
+
+window.addEventListener("load", function() {
+  el_list = document.getElementById("list");
+  setupSocket();
+});