vis: add go_ext grammar with embedded sql with go templating

vis/.config/vis/lexers/go_ext.lua

@@ -0,0 +1,31 @@
+-- Copyright 2006-2025 Mitchell. See LICENSE.
+-- go with SQL LPeg lexer.
+
+local lexer = lexer
+local starts_line = lexer.starts_line
+local B, P, S = lpeg.B, lpeg.P, lpeg.S
+
+local lex = lexer.new(..., {inherit = lexer.load('go')})
+
+local open_brace = lex:tag(lexer.OPERATOR, P('{'))
+local close_brace = lex:tag(lexer.OPERATOR, P('}'))
+local backtick = lex:tag(lexer.CODE, P('`'))
+local ws = lex:get_rule('whitespace')
+
+local tpl = lexer.new("template")
+tpl:add_rule('keyword', lex:tag(lexer.KEYWORD, lexer.word_match('if else end with range break define continue template block')))
+tpl:add_rule('constant', lex:get_rule('constant'))
+tpl:add_rule('operator', lex:get_rule('operator') + lex:tag(lexer.OPERATOR, S('$')))
+local func = lexer.after_set(' \t\n{|', lexer.word)
+tpl:add_rule('function', lex:tag(lexer.FUNCTION, func))
+tpl:add_rule('identifier', lex:get_rule('identifier'))
+tpl:add_rule('string', lex:get_rule('string'))
+tpl:add_rule('number', lex:get_rule('number'))
+
+local sql = lexer.load('sql')
+local sql_kwd = lexer.word_match('ALTER CREATE DELETE DROP GRANT INSERT SELECT UPDATE WITH')
+sql:embed(tpl, open_brace * open_brace, close_brace * close_brace)
+
+lex:embed(sql, backtick * #(ws^0 * sql_kwd), backtick)
+
+return lex

vis/.config/vis/visrc.lua

@@ -23,6 +23,10 @@ local plugins = {
 
 plug.init(plugins, true)
 
+vis.ftdetect.filetypes.go_ext = vis.ftdetect.filetypes.go
+vis.ftdetect.filetypes.go = nil
+plug.plugins.lspc.ls_map.go_ext = plug.plugins.lspc.ls_map.go
+
 vis.ftdetect.filetypes.templ = {
 	ext = { "%.templ$" },
 }