write-json-file - npm Package Compare versions

Comparing version 2.1.0 to 2.2.0

index.js

@@ -8,4 +8,5 @@ 'use strict';
 const pify = require('pify');
+const detectIndent = require('detect-indent');
 
-const main = (fn, fp, data, opts) => {
+const init = (fn, fp, data, opts) => {
 	if (!fp) {
@@ -31,14 +32,44 @@ throw new TypeError('Expected a filepath');
 
-	const json = JSON.stringify(data, opts.replacer, opts.indent);
+	return fn(fp, data, opts);
+};
 
-	return fn(fp, `${json}\n`, {mode: opts.mode});
+const readFile = fp => pify(fs.readFile)(fp, 'utf8').catch(() => {});
+
+const main = (fp, data, opts) => {
+	return (opts.detectIndent ? readFile(fp) : Promise.resolve())
+		.then(str => {
+			const indent = str ? detectIndent(str).indent : opts.indent;
+			const json = JSON.stringify(data, opts.replacer, indent);
+
+			return pify(writeFileAtomic)(fp, `${json}\n`, {mode: opts.mode});
+		});
 };
 
-module.exports = (fp, data, opts) =>
-	makeDir(path.dirname(fp), {fs})
-		.then(() => main(pify(writeFileAtomic), fp, data, opts));
+const mainSync = (fp, data, opts) => {
+	let indent = opts.indent;
 
+	if (opts.detectIndent) {
+		try {
+			const file = fs.readFileSync(fp, 'utf8');
+			indent = detectIndent(file).indent;
+		} catch (err) {
+			if (err.code !== 'ENOENT') {
+				throw err;
+			}
+		}
+	}
+
+	const json = JSON.stringify(data, opts.replacer, indent);
+
+	return writeFileAtomic.sync(fp, `${json}\n`, {mode: opts.mode});
+};
+
+module.exports = (fp, data, opts) => {
+	return makeDir(path.dirname(fp), {fs})
+		.then(() => init(main, fp, data, opts));
+};
+
 module.exports.sync = (fp, data, opts) => {
 	makeDir.sync(path.dirname(fp), {fs});
-	main(writeFileAtomic.sync, fp, data, opts);
+	init(mainSync, fp, data, opts);
 };

package.json

 {
   "name": "write-json-file",
-  "version": "2.1.0",
+  "version": "2.2.0",
   "description": "Stringify and write JSON to a file atomically",
@@ -36,2 +36,3 @@ "license": "MIT",
   "dependencies": {
+    "detect-indent": "^5.0.0",
     "graceful-fs": "^4.1.2",
@@ -38,0 +39,0 @@ "make-dir": "^1.0.0",

readme.md

@@ -46,2 +46,9 @@ # write-json-file [![Build Status](https://travis-ci.org/sindresorhus/write-json-file.svg?branch=master)](https://travis-ci.org/sindresorhus/write-json-file)
 
+##### detectIndent
+
+Type: `boolean`<br>
+Default: `false`
+
+Detect indentation automatically if the file exists.
+
 ##### sortKeys
@@ -48,0 +55,0 @@

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License

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Found 1 instance in 1 package

Fixed alerts

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License

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Found 1 instance in 1 package

Improved metrics

Total package byte prevSize

5497

increased by18.6%

Lines of code

59

increased by73.53%

Number of lines in readme file

84

increased by9.09%

Worsened metrics

Dependency count

6

increased by20%

Dependency changes

• + Addeddetect-indent@^5.0.0

• + Addeddetect-indent@5.0.0(transitive)