From 201588268884440a868f20fb184fdd2bbf8fd989 Mon Sep 17 00:00:00 2001
From: Joseph Garrone <joseph.garrone.gj@gmail.com>
Date: Sun, 9 Jun 2024 10:28:06 +0200
Subject: [PATCH] Avoid loop rebuild in watch mode

---
 src/bin/shared/generateKcGenTs.ts | 82 +++++++++++++++++--------------
 1 file changed, 46 insertions(+), 36 deletions(-)

diff --git a/src/bin/shared/generateKcGenTs.ts b/src/bin/shared/generateKcGenTs.ts
index c0134d33..128cab82 100644
--- a/src/bin/shared/generateKcGenTs.ts
+++ b/src/bin/shared/generateKcGenTs.ts
@@ -3,6 +3,7 @@ import type { BuildContext } from "./buildContext";
 import { getThemeSrcDirPath } from "./getThemeSrcDirPath";
 import * as fs from "fs/promises";
 import { join as pathJoin } from "path";
+import { existsAsync } from "../tools/fs.existsAsync";
 
 export type BuildContextLike = {
     projectDirPath: string;
@@ -21,41 +22,50 @@ export async function generateKcGenTs(params: {
         projectDirPath: buildContext.projectDirPath
     });
 
-    await fs.writeFile(
-        pathJoin(themeSrcDirPath, "kc.gen.ts"),
-        Buffer.from(
-            [
-                `/* prettier-ignore-start */`,
-                ``,
-                `/* eslint-disable */`,
-                ``,
-                `// @ts-nocheck`,
-                ``,
-                `// noinspection JSUnusedGlobalSymbols`,
-                ``,
-                `// This file is auto-generated by Keycloakify`,
-                ``,
-                `export type ThemeName = ${buildContext.themeNames.map(themeName => `"${themeName}"`).join(" | ")};`,
-                ``,
-                `export const themeNames: ThemeName[] = [${buildContext.themeNames.map(themeName => `"${themeName}"`).join(", ")}];`,
-                ``,
-                `export type KcEnvName = ${buildContext.environmentVariables.length === 0 ? "never" : buildContext.environmentVariables.map(({ name }) => `"${name}"`).join(" | ")};`,
-                ``,
-                `export const KcEnvNames: KcEnvName[] = [${buildContext.environmentVariables.map(({ name }) => `"${name}"`).join(", ")}];`,
-                ``,
-                `export const kcEnvDefaults: Record<KcEnvName, string> = ${JSON.stringify(
-                    Object.fromEntries(
-                        buildContext.environmentVariables.map(
-                            ({ name, default: defaultValue }) => [name, defaultValue]
-                        )
-                    ),
-                    null,
-                    2
-                )};`,
-                ``,
-                `/* prettier-ignore-end */`
-            ].join("\n"),
-            "utf8"
-        )
+    const filePath = pathJoin(themeSrcDirPath, "kc.gen.ts");
+
+    const currentContent = (await existsAsync(filePath))
+        ? await fs.readFile(filePath)
+        : undefined;
+
+    const newContent = Buffer.from(
+        [
+            `/* prettier-ignore-start */`,
+            ``,
+            `/* eslint-disable */`,
+            ``,
+            `// @ts-nocheck`,
+            ``,
+            `// noinspection JSUnusedGlobalSymbols`,
+            ``,
+            `// This file is auto-generated by Keycloakify`,
+            ``,
+            `export type ThemeName = ${buildContext.themeNames.map(themeName => `"${themeName}"`).join(" | ")};`,
+            ``,
+            `export const themeNames: ThemeName[] = [${buildContext.themeNames.map(themeName => `"${themeName}"`).join(", ")}];`,
+            ``,
+            `export type KcEnvName = ${buildContext.environmentVariables.length === 0 ? "never" : buildContext.environmentVariables.map(({ name }) => `"${name}"`).join(" | ")};`,
+            ``,
+            `export const KcEnvNames: KcEnvName[] = [${buildContext.environmentVariables.map(({ name }) => `"${name}"`).join(", ")}];`,
+            ``,
+            `export const kcEnvDefaults: Record<KcEnvName, string> = ${JSON.stringify(
+                Object.fromEntries(
+                    buildContext.environmentVariables.map(
+                        ({ name, default: defaultValue }) => [name, defaultValue]
+                    )
+                ),
+                null,
+                2
+            )};`,
+            ``,
+            `/* prettier-ignore-end */`
+        ].join("\n"),
+        "utf8"
     );
+
+    if (currentContent !== undefined && currentContent.equals(newContent)) {
+        return;
+    }
+
+    await fs.writeFile(filePath, newContent);
 }