Add script to automate updating compatibility key.

current-compatibility-key.json

@@ -1 +0,0 @@
-1

generator/compatibility-key.js

@@ -0,0 +1 @@
+module.exports = { compatibilityKey: 1 };

generator/src/render.js

@@ -9,6 +9,7 @@ const preRenderHtml = require("./pre-render-html.js");
 const { lookupOrPerform } = require("./request-cache.js");
 const kleur = require("kleur");
 const cookie = require("cookie-signature");
+const { compatibilityKey } = require("../compatibility-key.js");
 kleur.enabled = true;
 
 process.on("unhandledRejection", (error) => {
@@ -17,7 +18,6 @@ process.on("unhandledRejection", (error) => {
 let foundErrors;
 let pendingDataSourceResponses;
 let pendingDataSourceCount;
-const compatibilityKey = 1;
 
 module.exports =
   /**

src/Pages/Internal/Platform/Cli.elm

@@ -23,6 +23,7 @@ import PageServerResponse exposing (PageServerResponse)
 import Pages.Flags
 import Pages.Http
 import Pages.Internal.NotFoundReason as NotFoundReason exposing (NotFoundReason)
+import Pages.Internal.Platform.CompatibilityKey
 import Pages.Internal.Platform.Effect as Effect exposing (Effect)
 import Pages.Internal.Platform.StaticResponses as StaticResponses exposing (StaticResponses)
 import Pages.Internal.Platform.ToJsPayload as ToJsPayload
@@ -49,7 +50,7 @@ type alias Flags =
 {-| -}
 currentCompatibilityKey : Int
 currentCompatibilityKey =
-    1
+    Pages.Internal.Platform.CompatibilityKey.currentCompatibilityKey
 
 
 {-| -}

src/Pages/Internal/Platform/CompatibilityKey.elm

@@ -0,0 +1,6 @@
+module Pages.Internal.Platform.CompatibilityKey exposing (currentCompatibilityKey)
+
+
+currentCompatibilityKey : Int
+currentCompatibilityKey =
+    1

update-compatibility-keys.js

@@ -0,0 +1,33 @@
+#!/usr/bin/node
+
+const fs = require("fs");
+
+const currentCompatibilityKey = 1;
+
+fs.writeFileSync(
+  "src/Pages/Internal/Platform/CompatibilityKey.elm",
+  `module Pages.Internal.Platform.CompatibilityKey exposing (currentCompatibilityKey)
+
+
+currentCompatibilityKey : Int
+currentCompatibilityKey =
+    ${currentCompatibilityKey}
+`
+);
+
+fs.writeFileSync(
+  "generator/compatibility-key.js",
+  `module.exports = { compatibilityKey: ${currentCompatibilityKey} };
+`
+);
+
+fs.writeFileSync(
+  "./README.md",
+  fs
+    .readFileSync("./README.md")
+    .toString()
+    .replace(
+      /Current Compatibility Key: \d+\./,
+      `Current Compatibility Key: ${currentCompatibilityKey}.`
+    )
+);