Add google-java-format for java (#261)

Author: sunng87

README.md

@@ -59,7 +59,7 @@ Supported languages
 * **HLSL** ([*clang-format*](https://clang.llvm.org/docs/ClangFormat.html))
 * **HTML/XHTML/XML** ([*tidy*](http://www.html-tidy.org/))
 * **Hy** (Emacs)
-* **Java** ([*clang-format*](https://clang.llvm.org/docs/ClangFormat.html), [*astyle*](http://astyle.sourceforge.net/))
+* **Java** ([*astyle*](http://astyle.sourceforge.net/), [*clang-format*](https://clang.llvm.org/docs/ClangFormat.html), [*google-java-format*](https://github.com/google/google-java-format))
 * **JavaScript/JSON/JSX** ([*prettier*](https://prettier.io/), [*standard*](https://standardjs.com/), [*prettierd*](https://github.com/fsouza/prettierd), [*deno*](https://deno.land/manual/tools/formatter))
 * **Jsonnet** ([*jsonnetfmt*](https://jsonnet.org/))
 * **Kotlin** ([*ktlint*](https://github.com/shyiko/ktlint))

format-all.el

@@ -60,7 +60,7 @@
 ;; - HLSL (clang-format)
 ;; - HTML/XHTML/XML (tidy)
 ;; - Hy (Emacs)
-;; - Java (clang-format, astyle)
+;; - Java (astyle, clang-format, google-java-format)
 ;; - JavaScript/JSON/JSX (prettier, standard, prettierd, deno)
 ;; - Jsonnet (jsonnetfmt)
 ;; - Kotlin (ktlint)
@@ -162,7 +162,7 @@
     ("HTML+EEX" mix-format)
     ("HTML+ERB" erb-format)
     ("Hy" emacs-hy)
-    ("Java" clang-format)
+    ("Java" google-java-format)
     ("JavaScript" prettier)
     ("JSON" prettier)
     ("JSON5" prettier)
@@ -985,6 +985,13 @@ Consult the existing formatters for examples of BODY."
   (:features)
   (:format (format-all--buffer-easy executable)))
 
+(define-format-all-formatter google-java-format
+  (:executable "google-java-format")
+  (:install)
+  (:languages "Java")
+  (:features)
+  (:format (format-all--buffer-easy executable "-")))
+
 (define-format-all-formatter hclfmt
   (:executable "hclfmt")
   (:install "go install github.com/hashicorp/hcl/v2/cmd/hclfmt@latest")