Enable Prettier's Lua support

Re-implementation of #65

README.md

@@ -46,7 +46,7 @@ Supported languages
 * **Kotlin** ([*ktlint*](https://github.com/shyiko/ktlint))
 * **LaTeX** ([*latexindent*](https://github.com/cmhughes/latexindent.pl))
 * **Ledger** ([*ledger-mode*](https://github.com/ledger/ledger-mode))
-* **Lua** ([*lua-fmt*](https://github.com/trixnz/lua-fmt))
+* **Lua** ([*lua-fmt*](https://github.com/trixnz/lua-fmt), [*prettier plugin-lua*](https://github.com/prettier/plugin-lua))
 * **Markdown** ([*prettier*](https://prettier.io/))
 * **Nix** ([*nixfmt*](https://github.com/serokell/nixfmt))
 * **OCaml** ([*ocp-indent*](https://opam.ocaml.org/packages/ocp-indent/))

format-all.el

@@ -52,7 +52,7 @@
 ;; - Kotlin (ktlint)
 ;; - LaTeX (latexindent)
 ;; - Ledger (ledger-mode)
-;; - Lua (lua-fmt)
+;; - Lua (lua-fmt, prettier plugin-lua)
 ;; - Markdown (prettier)
 ;; - Nix (nixfmt)
 ;; - OCaml (ocp-indent)
@@ -646,9 +646,9 @@ Consult the existing formatters for examples of BODY."
 
 (define-format-all-formatter prettier
   (:executable "prettier")
-  (:install "npm install --global prettier @prettier/plugin-php prettier-plugin-solidity prettier-plugin-toml")
+  (:install "npm install --global prettier @prettier/plugin-lua @prettier/plugin-php prettier-plugin-solidity prettier-plugin-toml")
   (:languages
-   "CSS" "GraphQL" "JavaScript" "JSON" "JSX" "Less" "Markdown" "PHP"
+   "CSS" "GraphQL" "JavaScript" "JSON" "JSX" "Less" "Lua" "Markdown" "PHP"
    "SCSS" "Solidity" "TOML" "TSX" "TypeScript" "Vue" "YAML"
    ;; TODO: Use html-tidy instead of prettier for plain HTML. Enable
    ;; prettier's HTML support once we have multi-formatter support.