diff --git a/rc/coffee.kak b/rc/coffee.kak
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+# http://coffeescript.org
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufSetOption mimetype=text/x-coffee %{
+    set buffer filetype coffee
+}
+
+hook global BufCreate .*[.](coffee) %{
+    set buffer filetype coffee
+}
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+addhl -group / regions -default code coffee     \
+    double_string '"""' '"""'                '' \
+    single_string "'''" "'''"                '' \
+    comment       '###' '###'                '' \
+    regex         '///' ///[gimy]*           '' \
+    double_string '"' (?<!\\)(\\\\)*"        '' \
+    single_string "'" "'"                    '' \
+    regex         '/' (?<!\\)(\\\\)*/[gimy]* '' \
+    comment       '#' '$'                    ''
+
+# Regular expression flags are: g → global match, i → ignore case, m → multi-lines, y → sticky
+# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp
+
+addhl -group /coffee/double_string fill string
+addhl -group /coffee/double_string regions regions interpolation \Q#{ \} \{
+addhl -group /coffee/double_string/regions/interpolation fill meta
+addhl -group /coffee/single_string fill string
+addhl -group /coffee/regex fill meta
+addhl -group /coffee/regex regions regions interpolation \Q#{ \} \{
+addhl -group /coffee/regex/regions/interpolation fill meta
+addhl -group /coffee/comment fill comment
+
+# Keywords are collected at
+# https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Lexical_grammar#Keywords
+# http://coffeescript.org/documentation/docs/lexer.html#section-63
+addhl -group /coffee/code regex [$@]\w* 0:identifier
+addhl -group /coffee/code regex \<(Array|Boolean|Date|Function|Number|Object|RegExp|String)\> 0:type
+addhl -group /coffee/code regex \<(document|false|no|null|off|on|parent|self|this|true|undefined|window|yes)\> 0:value
+addhl -group /coffee/code regex \<(and|is|isnt|not|or)\> 0:operator
+addhl -group /coffee/code regex \<(break|case|catch|class|const|continue|debugger|default|delete|do|else|enum|export|extends|finally|for|function|if|implements|import|in|instanceof|interface|let|native|new|package|private|protected|public|return|static|super|switch|throw|try|typeof|var|void|while|with|yield)\> 0:keyword
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+def -hidden _coffee_filter_around_selections %{
+    eval -draft -itersel %{
+        exec <a-x>
+        # remove trailing white spaces
+        try %{ exec -draft s \h+$ <ret> d }
+    }
+}
+
+def -hidden _coffee_indent_on_new_line %{
+    eval -draft -itersel %{
+        # preserve previous line indent
+        try %{ exec -draft <space> K <a-&> }
+        # filter previous line
+        try %{ exec -draft k : _coffee_filter_around_selections <ret> }
+        # copy '#' comment prefix and following white spaces
+        try %{ exec -draft k x s ^\h*\K#\h* <ret> y j p }
+        # indent after lines beginning with token and ending with ->
+        try %_ exec -draft k x <a-k> ^\h*(case|catch|class|else|finally|for|function|if|switch|try|while|with)|(->)$ <ret> j <a-gt> _
+    }
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=coffee %{
+    addhl ref coffee
+
+    hook window InsertEnd  .* -group coffee-hooks  _coffee_filter_around_selections
+    hook window InsertChar \n -group coffee-indent _coffee_indent_on_new_line
+}
+
+hook global WinSetOption filetype=(?!coffee).* %{
+    rmhl coffee
+    rmhooks window coffee-indent
+    rmhooks window coffee-hooks
+}