feat: add option to auto detect encoding and do it by default

src/lib/openFile.js

@@ -386,14 +386,21 @@ export default async function openFile(file, options = {}) {
 
 		const binData = await fs.readFile();
 
-		// Detect encoding if not explicitly provided
+		// Determine encoding: if explicit provided use it, otherwise
+		// if settings.defaultFileEncoding === 'auto' then detect; else use the default as-is
 		let detectedEncoding = file.encoding || encoding;
 		if (!detectedEncoding) {
-			try {
-				detectedEncoding = await detectEncoding(binData);
-			} catch (error) {
-				console.warn("Encoding detection failed, using default:", error);
-				detectedEncoding = appSettings.value.defaultFileEncoding;
+			const defaultSetting = appSettings.value.defaultFileEncoding;
+			if (defaultSetting === "auto") {
+				try {
+					detectedEncoding = await detectEncoding(binData);
+					if (detectedEncoding === "auto") detectedEncoding = "UTF-8";
+				} catch (error) {
+					console.warn("Encoding detection failed, using UTF-8:", error);
+					detectedEncoding = "UTF-8";
+				}
+			} else {
+				detectedEncoding = defaultSetting || "UTF-8";
 			}
 		}
 

src/settings/appSettings.js

@@ -178,11 +178,15 @@ export default function otherSettings() {
 			key: "defaultFileEncoding",
 			text: strings["default file encoding"],
 			value: values.defaultFileEncoding,
-			valueText: (value) => getEncoding(value).label,
-			select: Object.keys(encodings).map((id) => {
-				const encoding = encodings[id];
-				return [id, encoding.label];
-			}),
+			valueText: (value) =>
+				value === "auto" ? strings.auto || "Auto" : getEncoding(value).label,
+			select: [
+				["auto", strings.auto || "Auto"],
+				...Object.keys(encodings).map((id) => {
+					const encoding = encodings[id];
+					return [id, encoding.label];
+				}),
+			],
 		},
 	];
 

src/utils/encodings.js

@@ -91,7 +91,8 @@ function isValidUTF8(bytes) {
 
 export async function detectEncoding(buffer) {
 	if (!buffer || buffer.byteLength === 0) {
-		return settings.value.defaultFileEncoding || "UTF-8";
+		const def = settings.value.defaultFileEncoding;
+		return def === "auto" ? "UTF-8" : def || "UTF-8";
 	}
 
 	const bytes = new Uint8Array(buffer);
@@ -115,7 +116,9 @@ export async function detectEncoding(buffer) {
 	const encodings = [
 		...new Set([
 			"UTF-8",
-			settings.value.defaultFileEncoding || "UTF-8",
+			settings.value.defaultFileEncoding === "auto"
+				? "UTF-8"
+				: settings.value.defaultFileEncoding || "UTF-8",
 			"windows-1252",
 			"ISO-8859-1",
 		]),
@@ -144,7 +147,8 @@ export async function detectEncoding(buffer) {
 		}
 	}
 
-	return settings.value.defaultFileEncoding || "UTF-8";
+	const def = settings.value.defaultFileEncoding;
+	return def === "auto" ? "UTF-8" : def || "UTF-8";
 }
 
 /**
@@ -165,6 +169,8 @@ export async function decode(buffer, charset) {
 		charset = settings.value.defaultFileEncoding;
 	}
 
+	if (charset === "auto") charset = "UTF-8";
+
 	charset = getEncoding(charset).name;
 	const text = await execDecode(buffer, charset);
 
@@ -186,6 +192,8 @@ export function encode(text, charset) {
 		charset = settings.value.defaultFileEncoding;
 	}
 
+	if (charset === "auto") charset = "UTF-8";
+
 	charset = getEncoding(charset).name;
 	return execEncode(text, charset);
 }