diff --git a/rc/extra/protobuf.kak b/rc/extra/protobuf.kak
new file mode 100644
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--- /dev/null
+++ b/rc/extra/protobuf.kak
@@ -0,0 +1,87 @@
+# https://developers.google.com/protocol-buffers/
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*\.proto$ %{
+    set-option buffer filetype protobuf
+}
+
+# Highlighters
+# ‾‾‾‾‾‾‾‾‾‾‾‾
+
+add-highlighter shared/protobuf regions
+add-highlighter shared/protobuf/code default-region group
+add-highlighter shared/protobuf/double_string region '"' (?<!\\)(\\\\)*" fill string
+add-highlighter shared/protobuf/comment region /\* \*/ fill comment
+add-highlighter shared/protobuf/comment_line region '//' $ fill comment
+
+add-highlighter shared/protobuf/code/ regex %{(0x)?[0-9]+\b} 0:value
+
+evaluate-commands %sh{
+    # Grammer
+    keywords="default|deprecated|enum|extend|import|message|oneof|option"
+    keywords="${keywords}|package|service|syntax"
+    attributes="optional|repeated|required"
+    types="double|float|int32|int64|uint32|uint64|sint32|sint64|fixed32|fixed64"
+    types="${types}|sfixed32|sfixed64|bool|string|bytes|rpc"
+    values="false|true"
+
+    # Add the language's grammer to the static completion list
+    printf '%s\n' "hook global WinSetOption filetype=protobuf %{
+        set-option window static_words ${keywords} ${attributes} ${types} ${values}
+    }" | tr '|' ' '
+
+    # Highlight keywords
+    printf %s "
+        add-highlighter shared/protobuf/code/keywords regex \b(${keywords})\b 0:keyword
+        add-highlighter shared/protobuf/code/attributes regex \b(${attributes})\b 0:attribute
+        add-highlighter shared/protobuf/code/types regex \b(${types})\b 0:type
+        add-highlighter shared/protobuf/code/values regex \b(${values})\b 0:value
+    "
+}
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+
+define-command -hidden protobuf-indent-on-newline %~
+    evaluate-commands -draft -itersel %[
+        # preserve previous line indent
+        try %{ execute-keys -draft \;K<a-&> }
+        # indent after lines ending with {
+        try %[ execute-keys -draft k<a-x> <a-k> \{\h*$ <ret> j<a-gt> ]
+        # cleanup trailing white spaces on the previous line
+        try %{ execute-keys -draft k<a-x> s \h+$ <ret>d }
+        # copy // comments prefix
+        try %{ execute-keys -draft \;<c-s>k<a-x> s ^\h*\K/{2,}(\h*(?=\S))? <ret> y<c-o>P<esc> }
+    ]
+~
+
+define-command -hidden protobuf-indent-on-opening-curly-brace %[
+    # align indent with opening paren when { is entered on a new line after the closing paren
+    try %[ execute-keys -draft -itersel h<a-F>)M <a-k> \A\(.*\)\h*\n\h*\{\z <ret> s \A|.\z <ret> 1<a-&> ]
+]
+
+define-command -hidden protobuf-indent-on-closing-curly-brace %[
+    # align to opening curly brace when alone on a line
+    try %[ execute-keys -itersel -draft <a-h><a-k>^\h+\}$<ret>hms\A|.\z<ret>1<a-&> ]
+]
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook -group protobuf-highlight global WinSetOption filetype=protobuf %{ add-highlighter window/protobuf ref protobuf }
+
+hook global WinSetOption filetype=protobuf %[
+    hook -group protobuf-indent window InsertChar \n protobuf-indent-on-newline
+    hook -group protobuf-indent window InsertChar \{ protobuf-indent-on-opening-curly-brace
+    hook -group protobuf-indent window InsertChar \} protobuf-indent-on-closing-curly-brace
+]
+
+hook -group protobuf-highlight global WinSetOption filetype=(?!protobuf).* %{ remove-highlighter window/protobuf }
+
+hook global WinSetOption filetype=(?!protobuf).* %{
+    remove-hooks window protobuf-hooks
+    remove-hooks window protobuf-indent
+}