1 files changed, 109 insertions, 0 deletions
diff --git a/autoload/filetype/protobuf.kak b/autoload/filetype/protobuf.kak
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+++ b/autoload/filetype/protobuf.kak
@@ -0,0 +1,109 @@
+# https://developers.google.com/protocol-buffers/
+
+# Detection
+# ‾‾‾‾‾‾‾‾‾
+
+hook global BufCreate .*\.proto$ %{
+    set-option buffer filetype protobuf
+}
+
+# Initialization
+# ‾‾‾‾‾‾‾‾‾‾‾‾‾‾
+
+hook global WinSetOption filetype=protobuf %[
+    require-module protobuf
+
+    set-option window static_words %opt{protobuf_static_words}
+
+    hook window ModeChange pop:insert:.* -group protobuf-trim-indent protobuf-trim-indent
+    hook -group protobuf-insert window InsertChar \n protobuf-insert-on-newline
+    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 -once -always window WinSetOption filetype=.* %{ remove-hooks window protobuf-.+ }
+]
+
+hook -group protobuf-highlight global WinSetOption filetype=protobuf %{
+    add-highlighter window/protobuf ref protobuf
+    hook -once -always window WinSetOption filetype=.* %{ remove-highlighter window/protobuf }
+}
+
+provide-module 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
+              package service syntax'
+    attributes='optional repeated required'
+    types='double float int32 int64 uint32 uint64 sint32 sint64 fixed32 fixed64
+           sfixed32 sfixed64 bool string bytes rpc'
+    values='false true'
+
+    join() { sep=$2; eval set -- $1; IFS="$sep"; echo "$*"; }
+
+    # Add the language's grammer to the static completion list
+    printf %s\\n "declare-option str-list protobuf_static_words $(join "${keywords} ${attributes} ${types} ${values}" ' ')"
+
+    # Highlight keywords
+    printf %s "
+        add-highlighter shared/protobuf/code/keywords regex \b($(join "${keywords}" '|'))\b 0:keyword
+        add-highlighter shared/protobuf/code/attributes regex \b($(join "${attributes}" '|'))\b 0:attribute
+        add-highlighter shared/protobuf/code/types regex \b($(join "${types}" '|'))\b 0:type
+        add-highlighter shared/protobuf/code/values regex \b($(join "${values}" '|'))\b 0:value
+    "
+}
+
+# Commands
+# ‾‾‾‾‾‾‾‾
+
+define-command -hidden protobuf-trim-indent %{
+    evaluate-commands -no-hooks -draft -itersel %{
+        execute-keys x
+        # remove trailing white spaces
+        try %{ execute-keys -draft s \h + $ <ret> d }
+    }
+}
+
+define-command -hidden protobuf-insert-on-newline %{
+    evaluate-commands -draft -itersel %[
+        # copy // comments prefix
+        try %{ execute-keys -draft <semicolon><c-s>kx s ^\h*\K/{2,}(\h*(?=\S))? <ret> y<c-o>P<esc> }
+    ]
+}
+
+define-command -hidden protobuf-indent-on-newline %~
+    evaluate-commands -draft -itersel %[
+        # preserve previous line indent
+        try %{ execute-keys -draft <semicolon>K<a-&> }
+        # indent after lines ending with {
+        try %[ execute-keys -draft kx <a-k> \{\h*$ <ret> j<a-gt> ]
+        # cleanup trailing white spaces on the previous line
+        try %{ execute-keys -draft kx s \h+$ <ret>d }
+        # deindent closing brace(s) when after cursor
+        try %[ execute-keys -draft x <a-k> ^\h*\} <ret> gh / \} <ret> m <a-S> 1<a-&> ]
+    ]
+~
+
+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-&> ]
+]
+
+]