feat: support --check flag (#86)

* feat: `--check` flag

* docs: update readme

* test: add tests

* docs: improve docs

* test: more test

* chore: remove `./`

README.md

@@ -72,6 +72,23 @@ $ sort-package-json packages/*/package.json
 $ sort-package-json my-package/package.json other-package/package.json
 ```
 
+#### `--check` flag
+
+When you want to check if your files are sorted, you can run CLI with the `--check` flag (or `-c`). This will output a list of not sorted files, if any.
+
+```bash
+$ sort-package-json **/package.json --check
+# all files are sorted.
+
+
+$ sort-package-json **/package.json --check
+# foo/package.json
+# bar/package.json
+
+# 2 files are not sorted.
+```
+
+
 ### Run (with [email protected]+)
 
 ```bash

fixtures/another-not-sorted/package.json

@@ -0,0 +1,4 @@
+{
+  "version": "0.0.0-development",
+  "name": "sort-package-json"
+}

fixtures/not-sorted-1/package.json

@@ -0,0 +1,4 @@
+{
+  "version": "0.0.0-development",
+  "name": "sort-package-json"
+}

fixtures/not-sorted-2/package.json

@@ -0,0 +1,4 @@
+{
+  "version": "0.0.0-development",
+  "name": "sort-package-json"
+}

fixtures/sorted-1/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "sort-package-json",
+  "version": "0.0.0-development"
+}

fixtures/sorted-2/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "sort-package-json",
+  "version": "0.0.0-development"
+}

index.js

@@ -216,20 +216,53 @@ module.exports.sortOrder = sortOrder;
 
 if (require.main === module) {
   const fs = require('fs');
+  const isCheckFlag = argument => argument === '--check' || argument === '-c';
 
-  const paths = process.argv[2]
-    ? process.argv.slice(2)
-    : [`${process.cwd()}/package.json`];
+  const cliArguments = process.argv.slice(2);
+  const isCheck = cliArguments.some(isCheckFlag);
 
-  paths.forEach(path => {
-    const filesToProcess = glob.sync(path);
-    filesToProcess.forEach(filePath => {
-      const packageJson = fs.readFileSync(filePath, 'utf8');
-      const sorted = sortPackageJson(packageJson);
-      if (sorted !== packageJson) {
-        fs.writeFileSync(filePath, sorted, 'utf8');
-        console.log(`${filePath} is sorted!`);
+  const patterns = cliArguments.filter(argument => !isCheckFlag(argument));
+
+  if (!patterns.length) {
+    patterns[0] = 'package.json';
+  }
+
+  const files = patterns.reduce(
+    (files, pattern) => files.concat(glob.sync(pattern)), 
+    []
+  );
+
+  let notSortedFiles = 0;
+
+  files.forEach(file => {
+    const packageJson = fs.readFileSync(file, 'utf8');
+    const sorted = sortPackageJson(packageJson);
+
+    if (sorted !== packageJson) {
+      if (isCheck) {
+        notSortedFiles ++;
+        console.log(file);
+      } else {
+        fs.writeFileSync(file, sorted, 'utf8');
+        console.log(`${file} is sorted!`);
       }
-    });
+    }
   });
+
+  if (isCheck) {
+    if (notSortedFiles) {
+      console.log(
+        notSortedFiles === 1 ? 
+        `${notSortedFiles} file is not sorted.`:
+        `\n ${notSortedFiles} files are not sorted.`
+      );
+    } else {
+      console.log(
+        files.length === 1 ?
+        `file is sorted.`:
+        `all files are sorted.`
+      );
+    }
+    process.exit(notSortedFiles)
+  }
 }

test.js

@@ -2,6 +2,7 @@ const assert = require('assert');
 const fs = require('fs');
 const newline = require('newline');
 const sortPackageJson = require('./');
+const { execFile } = require('child_process');
 
 fs.readFile('./package.json', 'utf8', (error, contents) => {
   if (error) {
@@ -117,3 +118,76 @@ fs.readFile('./package.json', 'utf8', (error, contents) => {
   );
 });
 
+
+// CLI `--check` flag tests
+
+// make sure `--check` not fixing file
+// support `-c` as well
+const orignal = fs.readFileSync('fixtures/not-sorted-1/package.json', 'utf8');
+execFile(
+  'node', 
+  ['index.js', 'fixtures/not-sorted-1/package.json', '-c'], 
+  (error, stdout, stderr) => {
+    assert.notEqual(
+      orignal, 
+      sortPackageJson(orignal),
+      'fixtures/not-sorted-1/package.json should be a unsorted file.'
+    );
+    assert.equal(
+      orignal, 
+      fs.readFileSync('fixtures/not-sorted-1/package.json', 'utf8'),
+      'file should not fixed when --check is enabled.'
+    );
+    assert.equal(error.code, 1, 'error.code should equals to unsorted file length');
+    assert.equal(stderr, '');
+    assert.equal(stdout.trim(), 'fixtures/not-sorted-1/package.json\n1 file is not sorted.');
+  }
+);
+
+
+execFile(
+  'node', 
+  ['index.js', 'fixtures/not-sorted-*/package.json','--check'], 
+  (error, stdout, stderr) => {
+    assert.equal(error.code, 2);
+    assert.equal(stderr, '');
+    assert.equal(stdout.includes('fixtures/not-sorted-1/package.json'), true);
+    assert.equal(stdout.includes('fixtures/not-sorted-2/package.json'), true);
+    assert.equal(stdout.includes('2 files are not sorted.'), true);
+  }
+);
+
+execFile(
+  'node', 
+  ['index.js', 'fixtures/sorted-1/package.json','--check'], 
+  (error, stdout, stderr) => {
+    assert.equal(error, null);
+    assert.equal(stderr, '');
+    assert.equal(stdout.trim(), 'file is sorted.');
+  }
+);
+
+execFile(
+  'node', 
+  ['index.js', 'fixtures/sorted-*/package.json','--check'], 
+  (error, stdout, stderr) => {
+    assert.equal(error, null);
+    assert.equal(stderr, '');
+    assert.equal(stdout.trim(), 'all files are sorted.');
+  }
+);
+
+execFile(
+  'node', 
+  ['index.js', 'fixtures/*/package.json','--check'], 
+  (error, stdout, stderr) => {
+    assert.equal(error.code, 3);
+    assert.equal(stderr, '');
+    assert.equal(stdout.includes('fixtures/sorted-1/package.json'), false);
+    assert.equal(stdout.includes('fixtures/sorted-2/package.json'), false);
+    assert.equal(stdout.includes('fixtures/not-sorted-1/package.json'), true);
+    assert.equal(stdout.includes('fixtures/not-sorted-2/package.json'), true);
+    assert.equal(stdout.includes('fixtures/another-not-sorted/package.json'), true);
+    assert.equal(stdout.includes('3 files are not sorted.'), true);
+  }
+);