feat: shebang support

- rename "isSupportedExtension" function to "isFileSupported"
- use `prettier.getFileInfo` to detect shebangs
- upgrade prettier to 1.15.0+ (where shebang support was added)

package.json

@@ -40,7 +40,7 @@
     "precommit": "./bin/pretty-quick.js --staged"
   },
   "peerDependencies": {
-    "prettier": ">=1.13.0"
+    "prettier": ">=1.15.0"
   },
   "devDependencies": {
     "babel-cli": "^6.26.0",
@@ -53,7 +53,7 @@
     "husky": "^0.14.3",
     "jest": "^23.6.0",
     "mock-fs": "^4.4.2",
-    "prettier": "1.13.0",
+    "prettier": "1.15.0",
     "semantic-release": "^11.0.2"
   }
 }

src/index.js

@@ -1,7 +1,7 @@
 import scms from './scms';
 import formatFiles from './formatFiles';
 import createIgnorer from './createIgnorer';
-import isSupportedExtension from './isSupportedExtension';
+import isFileSupported from './isFileSupported';
 
 export default (
   currentDirectory,
@@ -32,13 +32,13 @@ export default (
 
   const changedFiles = scm
     .getChangedFiles(rootDirectory, revision, staged)
-    .filter(isSupportedExtension)
+    .filter(isFileSupported)
     .filter(createIgnorer(rootDirectory));
 
   const unstagedFiles = staged
     ? scm
         .getUnstagedChangedFiles(rootDirectory, revision)
-        .filter(isSupportedExtension)
+        .filter(isFileSupported)
         .filter(createIgnorer(rootDirectory))
     : [];
 

src/isFileSupported.js

@@ -0,0 +1,11 @@
+import { extname } from 'path';
+import { getFileInfo, getSupportInfo } from 'prettier';
+
+const extensions = getSupportInfo().languages.reduce(
+  (prev, language) => prev.concat(language.extensions || []),
+  []
+);
+
+export default file =>
+  extensions.includes(extname(file)) ||
+  getFileInfo.sync(file).inferredParser !== null;

yarn.lock

@@ -4549,10 +4549,10 @@ preserve@^0.2.0:
   resolved "https://registry.yarnpkg.com/preserve/-/preserve-0.2.0.tgz#815ed1f6ebc65926f865b310c0713bcb3315ce4b"
   integrity sha1-gV7R9uvGWSb4ZbMQwHE7yzMVzks=
 
-prettier@1.13.0:
-  version "1.13.0"
-  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.13.0.tgz#054de8d5fb1a4405c845d16183f58a2c301f6f16"
-  integrity sha512-ubNahzMwHtdrSVGMMNabOHSeBKvZu+N5Z7Tu2CvbTexffL6aHwwOc7/fvEaWYTtvu4CtXnniHGA2vxV/NIH6KQ==
+prettier@1.15.0:
+  version "1.15.0"
+  resolved "https://registry.yarnpkg.com/prettier/-/prettier-1.15.0.tgz#c6191a50fbc9056ff770577d64ebd9987cca1dd7"
+  integrity sha512-NtSOnDRmJaNuruoX0KhDdQ3UGyLNJaSuP2eJn6Q6uSvzQBAJQHZbXgraFPbv8sYbNaMR9nz7scMy55WC+78E6w==
 
 pretty-format@^23.6.0:
   version "23.6.0"