From bde7c576e3e5e7c8899e3ee8311e38bd932e8220 Mon Sep 17 00:00:00 2001
From: Ben Visness <bvisness@gmail.com>
Date: Fri, 30 Jul 2021 21:36:37 -0500
Subject: [PATCH] Don't crash while listing migrations

---
 public/js/editorpreviews.js | 33 ---------------------------------
 public/style.css            | 31 ++++++++++---------------------
 src/migration/migration.go  | 14 ++++++++++++--
 3 files changed, 22 insertions(+), 56 deletions(-)
 delete mode 100644 public/js/editorpreviews.js

diff --git a/public/js/editorpreviews.js b/public/js/editorpreviews.js
deleted file mode 100644
index 6f51f81..0000000
--- a/public/js/editorpreviews.js
+++ /dev/null
@@ -1,33 +0,0 @@
-importScripts('../go_wasm_exec.js');
-
-/*
-NOTE(ben): The structure here is a little funny but allows for some debouncing. Any postMessages
-that got queued up can run all at once, then it can process the latest one.
- */
-
-let ready = false;
-let inputData = null;
-
-onmessage = ({ data }) => {
-    inputData = data;
-    setTimeout(doPreview, 0);
-}
-
-const go = new Go();
-WebAssembly.instantiateStreaming(fetch('../parsing.wasm'), go.importObject)
-    .then(result => {
-        go.run(result.instance); // don't await this; we want it to be continuously running
-        ready = true;
-        setTimeout(doPreview, 0);
-    });
-
-const doPreview = () => {
-    if (!ready || inputData === null) {
-        return;
-    }
-
-    const result = parseMarkdown(inputData);
-    inputData = null;
-
-    postMessage(result);
-}
diff --git a/public/style.css b/public/style.css
index 41b17fa..3bcc7d1 100644
--- a/public/style.css
+++ b/public/style.css
@@ -7289,6 +7289,9 @@ hr {
   border-top-style: solid;
   max-width: 300px; }
 
+.mono {
+  font-family: "Fira Mono", monospace; }
+
 article code {
   font-family: "Fira Mono", monospace; }
 
@@ -7443,6 +7446,9 @@ article code {
 .minh-5 {
   min-height: 16rem; }
 
+.minh-6 {
+  min-height: 32rem; }
+
 .fira {
   font-family: "Fira Sans", sans-serif; }
 
@@ -8004,27 +8010,10 @@ pre {
     border: 0px solid transparent;
     /* Not themed */ }
 
-.editor .toolbar {
-  width: 95%;
-  margin: 10px auto; }
-  .editor .toolbar select {
-    font-size: 10pt;
-    border: 0px; }
-    .editor .toolbar select:hover {
-      border: 0px; }
-    .editor .toolbar select:focus {
-      border: 0px; }
-  .editor .toolbar #bold {
-    font-weight: bold; }
-  .editor .toolbar #italic {
-    font-style: italic; }
-  .editor .toolbar #underline {
-    text-decoration: underline; }
-  .editor .toolbar #monospace {
-    font-family: monospace; }
-  .editor .toolbar #url {
-    text-decoration: underline;
-    font-style: italic; }
+@media screen and (min-width: 30em) {
+  #preview-container {
+    max-height: calc(100vh - 20rem);
+    overflow: auto; } }
 
 .edit-form .error {
   margin-left: 5em;
diff --git a/src/migration/migration.go b/src/migration/migration.go
index 84a46ec..82a1410 100644
--- a/src/migration/migration.go
+++ b/src/migration/migration.go
@@ -115,13 +115,23 @@ func getCurrentVersion(ctx context.Context, conn *pgx.Conn) (types.MigrationVers
 	return types.MigrationVersion(currentVersion), nil
 }
 
-func ListMigrations() {
-	ctx := context.Background()
+func tryGetCurrentVersion(ctx context.Context) types.MigrationVersion {
+	defer func() {
+		recover()
+	}()
 
 	conn := db.NewConn()
 	defer conn.Close(ctx)
 
 	currentVersion, _ := getCurrentVersion(ctx, conn)
+
+	return currentVersion
+}
+
+func ListMigrations() {
+	ctx := context.Background()
+
+	currentVersion := tryGetCurrentVersion(ctx)
 	for _, version := range getSortedMigrationVersions() {
 		migration := migrations.All[version]
 		indicator := "  "