elixir-error-tracker · sglyon · Jun 2, 2026
diff --git a/assets/js/app.js b/assets/js/app.js
@@ -52,6 +52,45 @@ const Hooks = {
     mounted() {
       Theme.init();
     }
+  },
+  CopyToClipboard: {
+    mounted() {
+      this.label = this.el.dataset.copyLabel || this.el.textContent;
+      this.copiedLabel = this.el.dataset.copiedLabel || "Copied";
+      this.timeout = null;
+      this.onClick = () => this.copy();
+      this.el.addEventListener("click", this.onClick);
+    },
+    destroyed() {
+      this.el.removeEventListener("click", this.onClick);
+      clearTimeout(this.timeout);
+    },
+    copy() {
+      const target = document.getElementById(this.el.dataset.copyTarget);
+      if (!target) return;
+
+      const text = target.value || target.textContent;
+      if (!text) return;
+
+      const writeText = navigator.clipboard
+        ? navigator.clipboard.writeText(text).catch(() => this.writeTextFallback(target))
+        : this.writeTextFallback(target);
+
+      writeText.then(() => {
+        this.el.textContent = this.copiedLabel;
+        clearTimeout(this.timeout);
+        this.timeout = setTimeout(() => {
+          this.el.textContent = this.label;
+        }, 2000);
+      });
+    },
+    writeTextFallback(target) {
+      target.select();
+      document.execCommand("copy");
+      target.blur();
+
+      return Promise.resolve();
+    }
   }
 };
 

diff --git a/lib/error_tracker/web/live/show.ex b/lib/error_tracker/web/live/show.ex
@@ -41,6 +41,10 @@ defmodule ErrorTracker.Web.Live.Show do
     socket =
       socket
       |> assign(occurrence: occurrence)
+      |> assign(
+        :copy_error_text,
+        copy_error_text(socket.assigns.error, occurrence, socket.assigns.app)
+      )
       |> load_related_occurrences()
 
     {:noreply, socket}
@@ -156,4 +160,67 @@ defmodule ErrorTracker.Web.Live.Show do
     |> limit(^num_results)
     |> Repo.all()
   end
+
+  @doc false
+  def copy_error_text(%Error{} = error, %Occurrence{} = occurrence, app) do
+    [
+      "Error ##{error.id}",
+      "Occurrence ##{occurrence.id}",
+      "Kind: #{error.kind}",
+      "Message:\n#{occurrence.reason}",
+      source_section(error),
+      breadcrumbs_section(occurrence.breadcrumbs),
+      stacktrace_section(occurrence.stacktrace, app),
+      context_section(occurrence.context)
+    ]
+    |> Enum.reject(&is_nil/1)
+    |> Enum.join("\n\n")
+  end
+
+  defp source_section(%Error{} = error) do
+    if Error.has_source_info?(error) do
+      String.trim("""
+      Source:
+      #{error.source_function}
+      #{error.source_line}
+      """)
+    end
+  end
+
+  defp breadcrumbs_section([]), do: nil
+  defp breadcrumbs_section(nil), do: nil
+
+  defp breadcrumbs_section(breadcrumbs) do
+    breadcrumbs =
+      breadcrumbs
+      |> Enum.reverse()
+      |> Enum.with_index(1)
+      |> Enum.map_join("\n", fn {breadcrumb, index} -> "#{index}. #{breadcrumb}" end)
+
+    "Breadcrumbs:\n#{breadcrumbs}"
+  end
+
+  defp stacktrace_section(%{lines: []}, _app), do: nil
+  defp stacktrace_section(nil, _app), do: nil
+
+  defp stacktrace_section(stacktrace, app) do
+    lines =
+      Enum.map_join(stacktrace.lines, "\n", fn line ->
+        application = line.application || to_string(app)
+        location = if line.line, do: "#{line.file}:#{line.line}", else: "(nofile)"
+
+        "(#{application}) #{line.module}.#{line.function}/#{line.arity}\n    #{location}"
+      end)
+
+    "Stacktrace:\n#{lines}"
+  end
+
+  defp context_section(context) do
+    json =
+      context
+      |> ErrorTracker.__default_json_encoder__().encode_to_iodata!()
+      |> IO.iodata_to_binary()
+
+    "Context:\n#{json}"
+  end
 end
diff --git a/lib/error_tracker/web/live/show.html.heex b/lib/error_tracker/web/live/show.html.heex
@@ -8,11 +8,28 @@
   <p class="text-sm uppercase font-semibold text-gray-400 light:text-gray-500">
     Error #{@error.id} @ {format_datetime(@occurrence.inserted_at)}
   </p>
-  <h1 class="my-1 text-2xl w-full font-semibold whitespace-nowrap text-ellipsis overflow-hidden">
-    ({sanitize_module(@error.kind)}) {@error.reason
-    |> String.replace("\n", " ")
-    |> String.trim()}
-  </h1>
+  <div class="flex flex-col gap-3 md:flex-row md:items-start md:justify-between">
+    <h1 class="my-1 text-2xl w-full font-semibold whitespace-nowrap text-ellipsis overflow-hidden">
+      ({sanitize_module(@error.kind)}) {@error.reason
+      |> String.replace("\n", " ")
+      |> String.trim()}
+    </h1>
+    <button
+      id="copy-error-button"
+      type="button"
+      class={[
+        "shrink-0 rounded-lg border border-gray-700 light:border-gray-300 px-3 py-2 text-sm font-semibold",
+        "text-sky-500 light:text-sky-600 hover:bg-gray-300/10 light:hover:bg-gray-100"
+      ]}
+      phx-hook="CopyToClipboard"
+      data-copy-target="copy-error-text"
+      data-copy-label="Copy error"
+      data-copied-label="Copied"
+    >
+      Copy error
+    </button>
+  </div>
+  <textarea id="copy-error-text" class="sr-only" readonly><%= @copy_error_text %></textarea>
 </div>
 
 <div class="grid grid-cols-1 md:grid-cols-4 md:space-x-3 mt-6 gap-2">

diff --git a/priv/static/app.js b/priv/static/app.js
@@ -1 +1,147 @@
-var x=Object.create;var{defineProperty:g,getPrototypeOf:E,getOwnPropertyNames:F}=Object;var I=Object.prototype.hasOwnProperty;var w=(e,i,u)=>{u=e!=null?x(E(e)):{};const t=i||!e||!e.__esModule?g(u,"default",{value:e,enumerable:!0}):u;for(let o of F(e))if(!I.call(t,o))g(t,o,{get:()=>e[o],enumerable:!0});return t};var A=(e,i)=>()=>(i||e((i={exports:{}}).exports,i),i.exports);var m=A((y,f)=>{(function(e,i){function u(){t.width=e.innerWidth,t.height=5*r.barThickness;var n=t.getContext("2d");n.shadowBlur=r.shadowBlur,n.shadowColor=r.shadowColor;var s,a=n.createLinearGradient(0,0,t.width,0);for(s in r.barColors)a.addColorStop(s,r.barColors[s]);n.lineWidth=r.barThickness,n.beginPath(),n.moveTo(0,r.barThickness/2),n.lineTo(Math.ceil(o*t.width),r.barThickness/2),n.strokeStyle=a,n.stroke()}var t,o,c,d=null,p=null,h=null,r={autoRun:!0,barThickness:3,barColors:{0:"rgba(26,  188, 156, .9)",".25":"rgba(52,  152, 219, .9)",".50":"rgba(241, 196, 15,  .9)",".75":"rgba(230, 126, 34,  .9)","1.0":"rgba(211, 84,  0,   .9)"},shadowBlur:10,shadowColor:"rgba(0,   0,   0,   .6)",className:null},l={config:function(n){for(var s in n)r.hasOwnProperty(s)&&(r[s]=n[s])},show:function(n){var s,a;c||(n?h=h||setTimeout(()=>l.show(),n):(c=!0,p!==null&&e.cancelAnimationFrame(p),t||((a=(t=i.createElement("canvas")).style).position="fixed",a.top=a.left=a.right=a.margin=a.padding=0,a.zIndex=100001,a.display="none",r.className&&t.classList.add(r.className),s="resize",n=u,(a=e).addEventListener?a.addEventListener(s,n,!1):a.attachEvent?a.attachEvent("on"+s,n):a["on"+s]=n),t.parentElement||i.body.appendChild(t),t.style.opacity=1,t.style.display="block",l.progress(0),r.autoRun&&function T(){d=e.requestAnimationFrame(T),l.progress("+"+0.05*Math.pow(1-Math.sqrt(o),2))}()))},progress:function(n){return n===void 0||(typeof n=="string"&&(n=(0<=n.indexOf("+")||0<=n.indexOf("-")?o:0)+parseFloat(n)),o=1<n?1:n,u()),o},hide:function(){clearTimeout(h),h=null,c&&(c=!1,d!=null&&(e.cancelAnimationFrame(d),d=null),function n(){return 1<=l.progress("+.1")&&(t.style.opacity-=0.05,t.style.opacity<=0.05)?(t.style.display="none",void(p=null)):void(p=e.requestAnimationFrame(n))}())}};typeof f=="object"&&typeof y=="object"?f.exports=l:typeof define=="function"&&define.amd?define(function(){return l}):this.topbar=l}).call(y,window,document)});var b=w(m(),1),B=document.querySelector("meta[name='csrf-token']").getAttribute("content"),M=document.querySelector("meta[name='live-path']").getAttribute("content"),N=document.querySelector("meta[name='live-transport']").getAttribute("content"),v={STORAGE_KEY:"error-tracker-theme",init(){if(localStorage.getItem(this.STORAGE_KEY)==="light")document.body.classList.add("light-theme")},toggle(){const e=document.body.classList.toggle("light-theme");localStorage.setItem(this.STORAGE_KEY,e?"light":"dark")},isLight(){return document.body.classList.contains("light-theme")}},q={JsonPrettyPrint:{mounted(){this.formatJson()},updated(){this.formatJson()},formatJson(){try{const e=this.el.textContent.trim(),i=JSON.stringify(JSON.parse(e),null,2);this.el.textContent=i}catch(e){console.error("Error formatting JSON:",e)}}},ThemeInit:{mounted(){v.init()}}},C=new LiveView.LiveSocket(M,Phoenix.Socket,{transport:N==="longpoll"?Phoenix.LongPoll:WebSocket,params:{_csrf_token:B},hooks:q});b.default.config({barColors:{0:"#29d"},shadowColor:"rgba(0, 0, 0, .3)"});window.addEventListener("phx:page-loading-start",(e)=>b.default.show(300));window.addEventListener("phx:page-loading-stop",(e)=>b.default.hide());document.addEventListener("click",function(e){var i=e.target.closest("[data-theme-toggle]");if(i)v.toggle()});C.connect();window.liveSocket=C;
+var __create = Object.create;
+var __getProtoOf = Object.getPrototypeOf;
+var __defProp = Object.defineProperty;
+var __getOwnPropNames = Object.getOwnPropertyNames;
+var __hasOwnProp = Object.prototype.hasOwnProperty;
+var __toESM = (mod, isNodeMode, target) => {
+  target = mod != null ? __create(__getProtoOf(mod)) : {};
+  const to = isNodeMode || !mod || !mod.__esModule ? __defProp(target, "default", { value: mod, enumerable: true }) : target;
+  for (let key of __getOwnPropNames(mod))
+    if (!__hasOwnProp.call(to, key))
+      __defProp(to, key, {
+        get: () => mod[key],
+        enumerable: true
+      });
+  return to;
+};
+var __commonJS = (cb, mod) => () => (mod || cb((mod = { exports: {} }).exports, mod), mod.exports);
+
+// ../node_modules/topbar/topbar.min.js
+var require_topbar_min = __commonJS((exports, module) => {
+  (function(window2, document2) {
+    function repaint() {
+      canvas.width = window2.innerWidth, canvas.height = 5 * options.barThickness;
+      var ctx = canvas.getContext("2d");
+      ctx.shadowBlur = options.shadowBlur, ctx.shadowColor = options.shadowColor;
+      var stop, lineGradient = ctx.createLinearGradient(0, 0, canvas.width, 0);
+      for (stop in options.barColors)
+        lineGradient.addColorStop(stop, options.barColors[stop]);
+      ctx.lineWidth = options.barThickness, ctx.beginPath(), ctx.moveTo(0, options.barThickness / 2), ctx.lineTo(Math.ceil(currentProgress * canvas.width), options.barThickness / 2), ctx.strokeStyle = lineGradient, ctx.stroke();
+    }
+    var canvas, currentProgress, showing, progressTimerId = null, fadeTimerId = null, delayTimerId = null, options = { autoRun: true, barThickness: 3, barColors: { 0: "rgba(26,  188, 156, .9)", ".25": "rgba(52,  152, 219, .9)", ".50": "rgba(241, 196, 15,  .9)", ".75": "rgba(230, 126, 34,  .9)", "1.0": "rgba(211, 84,  0,   .9)" }, shadowBlur: 10, shadowColor: "rgba(0,   0,   0,   .6)", className: null }, topbar = { config: function(opts) {
+      for (var key in opts)
+        options.hasOwnProperty(key) && (options[key] = opts[key]);
+    }, show: function(handler) {
+      var type, elem;
+      showing || (handler ? delayTimerId = delayTimerId || setTimeout(() => topbar.show(), handler) : (showing = true, fadeTimerId !== null && window2.cancelAnimationFrame(fadeTimerId), canvas || ((elem = (canvas = document2.createElement("canvas")).style).position = "fixed", elem.top = elem.left = elem.right = elem.margin = elem.padding = 0, elem.zIndex = 100001, elem.display = "none", options.className && canvas.classList.add(options.className), type = "resize", handler = repaint, (elem = window2).addEventListener ? elem.addEventListener(type, handler, false) : elem.attachEvent ? elem.attachEvent("on" + type, handler) : elem["on" + type] = handler), canvas.parentElement || document2.body.appendChild(canvas), canvas.style.opacity = 1, canvas.style.display = "block", topbar.progress(0), options.autoRun && function loop() {
+        progressTimerId = window2.requestAnimationFrame(loop), topbar.progress("+" + 0.05 * Math.pow(1 - Math.sqrt(currentProgress), 2));
+      }()));
+    }, progress: function(to) {
+      return to === undefined || (typeof to == "string" && (to = (0 <= to.indexOf("+") || 0 <= to.indexOf("-") ? currentProgress : 0) + parseFloat(to)), currentProgress = 1 < to ? 1 : to, repaint()), currentProgress;
+    }, hide: function() {
+      clearTimeout(delayTimerId), delayTimerId = null, showing && (showing = false, progressTimerId != null && (window2.cancelAnimationFrame(progressTimerId), progressTimerId = null), function loop() {
+        return 1 <= topbar.progress("+.1") && (canvas.style.opacity -= 0.05, canvas.style.opacity <= 0.05) ? (canvas.style.display = "none", void (fadeTimerId = null)) : void (fadeTimerId = window2.requestAnimationFrame(loop));
+      }());
+    } };
+    typeof module == "object" && typeof module.exports == "object" ? module.exports = topbar : typeof define == "function" && define.amd ? define(function() {
+      return topbar;
+    }) : this.topbar = topbar;
+  }).call(exports, window, document);
+});
+
+// app.js
+var import_topbar = __toESM(require_topbar_min(), 1);
+var csrfToken = document.querySelector("meta[name='csrf-token']").getAttribute("content");
+var livePath = document.querySelector("meta[name='live-path']").getAttribute("content");
+var liveTransport = document.querySelector("meta[name='live-transport']").getAttribute("content");
+var Theme = {
+  STORAGE_KEY: "error-tracker-theme",
+  init() {
+    const saved = localStorage.getItem(this.STORAGE_KEY);
+    if (saved === "light") {
+      document.body.classList.add("light-theme");
+    }
+  },
+  toggle() {
+    const isLight = document.body.classList.toggle("light-theme");
+    localStorage.setItem(this.STORAGE_KEY, isLight ? "light" : "dark");
+  },
+  isLight() {
+    return document.body.classList.contains("light-theme");
+  }
+};
+var Hooks = {
+  JsonPrettyPrint: {
+    mounted() {
+      this.formatJson();
+    },
+    updated() {
+      this.formatJson();
+    },
+    formatJson() {
+      try {
+        const rawJson = this.el.textContent.trim();
+        const formattedJson = JSON.stringify(JSON.parse(rawJson), null, 2);
+        this.el.textContent = formattedJson;
+      } catch (error) {
+        console.error("Error formatting JSON:", error);
+      }
+    }
+  },
+  ThemeInit: {
+    mounted() {
+      Theme.init();
+    }
+  },
+  CopyToClipboard: {
+    mounted() {
+      this.label = this.el.dataset.copyLabel || this.el.textContent;
+      this.copiedLabel = this.el.dataset.copiedLabel || "Copied";
+      this.timeout = null;
+      this.onClick = () => this.copy();
+      this.el.addEventListener("click", this.onClick);
+    },
+    destroyed() {
+      this.el.removeEventListener("click", this.onClick);
+      clearTimeout(this.timeout);
+    },
+    copy() {
+      const target = document.getElementById(this.el.dataset.copyTarget);
+      if (!target)
+        return;
+      const text = target.value || target.textContent;
+      if (!text)
+        return;
+      const writeText = navigator.clipboard ? navigator.clipboard.writeText(text).catch(() => this.writeTextFallback(target)) : this.writeTextFallback(target);
+      writeText.then(() => {
+        this.el.textContent = this.copiedLabel;
+        clearTimeout(this.timeout);
+        this.timeout = setTimeout(() => {
+          this.el.textContent = this.label;
+        }, 2000);
+      });
+    },
+    writeTextFallback(target) {
+      target.select();
+      document.execCommand("copy");
+      target.blur();
+      return Promise.resolve();
+    }
+  }
+};
+var liveSocket = new LiveView.LiveSocket(livePath, Phoenix.Socket, {
+  transport: liveTransport === "longpoll" ? Phoenix.LongPoll : WebSocket,
+  params: { _csrf_token: csrfToken },
+  hooks: Hooks
+});
+import_topbar.default.config({ barColors: { 0: "#29d" }, shadowColor: "rgba(0, 0, 0, .3)" });
+window.addEventListener("phx:page-loading-start", (_info) => import_topbar.default.show(300));
+window.addEventListener("phx:page-loading-stop", (_info) => import_topbar.default.hide());
+document.addEventListener("click", function(e) {
+  var toggle = e.target.closest("[data-theme-toggle]");
+  if (toggle) {
+    Theme.toggle();
+  }
+});
+liveSocket.connect();
+window.liveSocket = liveSocket;
diff --git a/test/error_tracker/web/live/show_test.exs b/test/error_tracker/web/live/show_test.exs
@@ -0,0 +1,56 @@
+defmodule ErrorTracker.Web.Live.ShowTest do
+  use ExUnit.Case, async: true
+
+  alias ErrorTracker.Error
+  alias ErrorTracker.Occurrence
+  alias ErrorTracker.Stacktrace
+  alias ErrorTracker.Web.Live.Show
+
+  test "copy_error_text/3 includes LLM-friendly error details" do
+    error = %Error{
+      id: 123,
+      kind: "Elixir.RuntimeError",
+      source_function: "Demo.run/1",
+      source_line: "lib/demo.ex:10"
+    }
+
+    occurrence = %Occurrence{
+      id: 456,
+      reason: "Something broke",
+      breadcrumbs: ["opened dashboard", "clicked button"],
+      context: %{"request_id" => "req-1"},
+      stacktrace: %Stacktrace{
+        lines: [
+          %Stacktrace.Line{
+            application: "demo",
+            module: "Demo",
+            function: "run",
+            arity: 1,
+            file: "lib/demo.ex",
+            line: 10
+          },
+          %Stacktrace.Line{
+            application: nil,
+            module: "Kernel",
+            function: "apply",
+            arity: 2,
+            file: "nofile",
+            line: nil
+          }
+        ]
+      }
+    }
+
+    text = Show.copy_error_text(error, occurrence, :fallback_app)
+
+    assert text =~ "Error #123"
+    assert text =~ "Occurrence #456"
+    assert text =~ "Kind: Elixir.RuntimeError"
+    assert text =~ "Message:\nSomething broke"
+    assert text =~ "Source:\nDemo.run/1\nlib/demo.ex:10"
+    assert text =~ "Breadcrumbs:\n1. clicked button\n2. opened dashboard"
+    assert text =~ "(demo) Demo.run/1\n    lib/demo.ex:10"
+    assert text =~ "(fallback_app) Kernel.apply/2\n    (nofile)"
+    assert text =~ ~s("request_id":"req-1")
+  end
+end