Add lang/faust module (#1898)

modules/lang/faust/config.el

@@ -0,0 +1,29 @@
+;;; lang/faust/config.el -*- lexical-binding: t; -*-
+
+(use-package! faustine
+  :mode ("\\.dsp\\'" . faustine-mode)
+  :config
+
+  (set-company-backend! '(faust-mode faustine-mode) '+faust-company-backend)
+
+  (defadvice! +faust--suppress-ac-warnings-a (orig-fn &rest args)
+    "Silence obnoxious 'You really should install and use auto-complete' warnings
+when starting faust-mode *and* faustine-mode. You really should *not* install
+nor use auto-complete."
+    :around '(faust-mode faustine-mode)
+    (let (ac-modes ac-sources)
+      (apply orig-fn args)))
+
+  (map! :localleader
+        :map faustine-mode-map
+        "b" #'faustine-build
+        "c" #'faustine-syntax-check
+        "d" #'faustine-diagram
+        "h" #'faustine-online-doc
+        "RET" #'faustine-mdoc
+        "o" #'faustine-toggle-output-buffer
+        "s" #'faustine-source-code
+        "r" #'faustine-run
+        "S-b" #'faustine-build-all
+        "S-d" #'faustine-diagram-all
+        ))