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+# http://sass-lang.com
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.](sass) %{
+    set-option buffer filetype sass
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=sass %<
+    require-module sass
+
+    hook window ModeChange pop:insert:.* -group sass-trim-indent sass-trim-indent
+    hook window InsertChar \} -group sass-indent sass-indent-on-closing-brace
+    hook window InsertChar \n -group sass-insert sass-insert-on-new-line
+    hook window InsertChar \n -group sass-indent sass-indent-on-new-line
+    set-option buffer extra_word_chars '_' '-'
+
+    hook -once -always window WinSetOption filetype=.* %{ remove-hooks window sass-.+ }
+>
+
+hook -group sass-highlight global WinSetOption filetype=sass %{
+    add-highlighter window/sass ref sass
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/sass }
+}
+
+
+provide-module sass %§
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/sass regions
+add-highlighter shared/sass/code default-region group
+add-highlighter shared/sass/single_string  region '"' (?<!\\)(\\\\)*" fill string
+add-highlighter shared/sass/double_string  region "'" "'"             fill string
+add-highlighter shared/sass/comment        region '//' '$'            fill comment
+add-highlighter shared/sass/css_comment    region /[*] [*]/           fill comment
+
+add-highlighter shared/sass/code/ regex [*]|[#.][A-Za-z][A-Za-z0-9_-]* 0:variable
+add-highlighter shared/sass/code/ regex &|@[A-Za-z][A-Za-z0-9_-]* 0:meta
+add-highlighter shared/sass/code/ regex (#[0-9A-Fa-f]+)|((\d*\.)?\d+(em|px)) 0:value
+add-highlighter shared/sass/code/ regex ([A-Za-z][A-Za-z0-9_-]*)\h*: 1:keyword
+add-highlighter shared/sass/code/ regex :(before|after) 0:attribute
+add-highlighter shared/sass/code/ regex !important 0:keyword
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden sass-trim-indent %{
+    # remove trailing white spaces
+    try %{ execute-keys -draft -itersel x s \h+$ <ret> d }
+}
+
+define-command -hidden sass-indent-on-closing-brace %<
+    evaluate-commands -draft -itersel %<
+        # align closing brace to same indentation as the line that the opening brace resides on
+        try %[ execute-keys -draft <a-h> <a-k> ^\h+\}$ <ret> m <a-S> 1<a-&> ]
+    >
+>
+
+define-command -hidden sass-insert-on-new-line %<
+    evaluate-commands -draft -itersel %<
+        # copy // comment prefix and following white spaces
+        try %{ execute-keys -draft k x s ^\h*\K/{2,}\h* <ret> y gh j P }
+    >
+>
+
+define-command -hidden sass-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 : sass-trim-indent <ret> }
+        # avoid indent after properties and comments
+        try %{ execute-keys -draft k x <a-K> [:/] <ret> j <a-gt> }
+        # deindent closing brace when after cursor
+        try %[ execute-keys -draft x <a-k> ^\h*\} <ret> gh / \} <ret> m <a-S> 1<a-&> ]
+    >
+>
+
+§