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diff --git a/autoload/filetype/haml.kak b/autoload/filetype/haml.kak
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+# http://haml.info
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.](haml) %{
+    set-option buffer filetype haml
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=haml %{
+    require-module haml
+
+    hook window ModeChange pop:insert:.* -group haml-trim-indent haml-trim-indent
+    hook window InsertChar \n -group haml-insert haml-insert-on-new-line
+    hook window InsertChar \n -group haml-indent haml-indent-on-new-line
+
+    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window haml-.+ }
+}
+
+hook -group haml-highlight global WinSetOption filetype=haml %{
+    add-highlighter window/haml ref haml
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/haml }
+}
+
+
+provide-module haml %[
+require-module ruby
+require-module coffee
+require-module sass
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/haml regions
+add-highlighter shared/haml/code    default-region group
+add-highlighter shared/haml/comment region ^\h*/          $             fill comment
+
+# Filters
+# http://haml.info/docs/yardoc/file.REFERENCE.html#filters
+add-highlighter shared/haml/eval1   region -recurse \{ ^\h*%([A-Za-z][A-Za-z0-9_-]*)([#.][A-Za-z][A-Za-z0-9_-]*)?\{\K|#\{\K (?=\}) ref ruby
+add-highlighter shared/haml/eval2   region ^\h*[=-]\K     (?<!\|)(?=\n) ref ruby
+add-highlighter shared/haml/coffee  region ^\h*:coffee\K  ^\h*[%=-]\K   ref coffee
+add-highlighter shared/haml/sass    region ^\h*:sass\K    ^\h*[%=-]\K   ref sass
+
+add-highlighter shared/haml/code/ regex ^\h*(:[a-z]+|-|=)|^(!!!)$ 0:meta
+add-highlighter shared/haml/code/ regex ^\h*%([A-Za-z][A-Za-z0-9_-]*)([#.][A-Za-z][A-Za-z0-9_-]*)? 1:keyword 2:variable
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden haml-trim-indent %{
+    # remove trailing white spaces
+    try %{ execute-keys -draft -itersel x s \h+$ <ret> d }
+}
+
+define-command -hidden haml-insert-on-new-line %{
+    evaluate-commands -draft -itersel %{
+        # copy '/' comment prefix and following white spaces
+        try %{ execute-keys -draft k x s ^\h*\K/\h* <ret> y gh j P }
+    }
+}
+
+define-command -hidden haml-indent-on-new-line %{
+    evaluate-commands -draft -itersel %{
+        # preserve previous line indent
+        try %{ execute-keys -draft <semicolon> K <a-&> }
+        # filter previous line
+        try %{ execute-keys -draft k : haml-trim-indent <ret> }
+        # indent after lines beginning with : or -
+        try %{ execute-keys -draft k x <a-k> ^\h*[:-] <ret> j <a-gt> }
+    }
+}
+
+]