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+# http://gluon-lang.org
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*[.](glu) %{
+    set-option buffer filetype gluon
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=gluon %{
+    require-module gluon
+
+    set-option window extra_word_chars '_' "'"
+    hook window ModeChange pop:insert:.* -group gluon-trim-indent gluon-trim-indent
+    hook window InsertChar \n -group gluon-insert gluon-insert-on-new-line
+    hook window InsertChar \n -group gluon-indent gluon-indent-on-new-line
+
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-hooks window gluon-.+
+    }
+}
+
+hook -group gluon-highlight global WinSetOption filetype=gluon %{
+    add-highlighter window/gluon ref gluon
+    hook -once -always window WinSetOption filetype=.* %{
+        remove-highlighter window/gluon
+    }
+}
+
+
+provide-module gluon %§
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/gluon regions
+add-highlighter shared/gluon/code default-region group
+add-highlighter shared/gluon/string region (?<!')" (?<!\\)(\\\\)*" fill string
+add-highlighter shared/gluon/raw_string region -match-capture \br(#+)" \"(#+) fill string
+add-highlighter shared/gluon/comment region /\* \*/ fill comment
+add-highlighter shared/gluon/line_comment region // $ fill comment
+add-highlighter shared/gluon/attribute region -recurse \[ '#\[' \] fill meta
+# balance out bracket ]
+
+# matches hexadecimal literals
+add-highlighter shared/gluon/code/ regex \b0x+[A-Fa-f0-9]+ 0:value
+# matches decimal and floating-point literals
+add-highlighter shared/gluon/code/ regex \b\d+([.]\d+)? 0:value
+
+# matches keywords
+add-highlighter shared/gluon/code/ regex \
+    (?<!')\b(type|if|then|else|match|with|let|rec|do|seq|in)\b(?!') 0:keyword
+
+# matches macros
+add-highlighter shared/gluon/code/ regex \b\w+! 0:meta
+
+# matches uppercase identifiers: Monad Some
+add-highlighter shared/gluon/code/ regex \b[A-Z][\w']* 0:variable
+
+# matches operators: ... > < <= ^ <*> <$> etc
+# matches dot: .
+# matches keywords:  @ : ->
+add-highlighter shared/gluon/code/ regex (?<![~<=>|:!?/.@$*&#%+\^\-\\])[~<=>|:!?/.@$*&#%+\^\-\\]+ 0:operator
+
+# matches 'x' '\\' '\'' '\n' '\0'
+# not incomplete literals: '\'
+add-highlighter shared/gluon/code/ regex \B'([^\\]|[\\]['"\w\d\\])' 0:string
+# this has to come after operators so '-' etc is correct
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden gluon-trim-indent %{
+    # remove trailing white spaces
+    try %{ execute-keys -draft -itersel x s \h+$ <ret> d }
+}
+
+define-command -hidden gluon-insert-on-new-line %~
+    evaluate-commands -draft -itersel %_
+        # copy // and /// comments prefix and following white spaces
+        try %{ execute-keys -draft k x s ^\h*\K///?\h* <ret> y gh j P }
+    _
+~
+
+define-command -hidden gluon-indent-on-new-line %~
+    evaluate-commands -draft -itersel %_
+        # preserve previous line indent
+        try %{ execute-keys -draft \; K <a-&> }
+        # filter previous line
+        try %{ execute-keys -draft k : gluon-trim-indent <ret> }
+        # indent after lines ending with (open) braces, =, ->, condition, rec,
+        # or in
+        try %{ execute-keys -draft \; k x <a-k> (\(|\{|\[|=|->|\b(?:then|else|rec|in))$ <ret> j <a-gt> }
+        # deindent closing brace(s) when after cursor
+        try %< execute-keys -draft x <a-k> ^\h*[})\]] <ret> gh / \})\]] <ret> m <a-S> 1<a-&> >
+    _
+~
+
+§