all: make comptime templates usable outside of vweb via $tmpl

examples/tetris/tetris.v

@@ -333,7 +333,7 @@ fn (g &Game) draw_tetro() {
 fn (g &Game) draw_next_tetro() {
 	if g.state != .gameover {
 		idx := g.next_tetro_idx * tetro_size * tetro_size
-		next_tetro := g.tetros_cache[idx..idx + tetro_size]
+		next_tetro := g.tetros_cache[idx..idx + tetro_size].clone()
 		pos_y := 0
 		pos_x := field_width / 2 - tetro_size / 2
 		for i in 0 .. tetro_size {

vlib/v/checker/checker.v

@@ -1823,20 +1823,20 @@ pub fn (mut c Checker) selector_expr(mut selector_expr ast.SelectorExpr) table.T
 // TODO: non deferred
 pub fn (mut c Checker) return_stmt(mut return_stmt ast.Return) {
 	c.expected_type = c.cur_fn.return_type
-	if return_stmt.exprs.len > 0 && c.expected_type == table.void_type {
+	expected_type := c.unwrap_generic(c.expected_type)
+	expected_type_sym := c.table.get_type_symbol(expected_type)
+	if return_stmt.exprs.len > 0 && c.cur_fn.return_type == table.void_type {
 		c.error('too many arguments to return, current function does not return anything',
 			return_stmt.pos)
 		return
 	} else if return_stmt.exprs.len == 0 && !(c.expected_type == table.void_type ||
-		c.table.get_type_symbol(c.expected_type).kind == .void) {
+		expected_type_sym.kind == .void) {
 		c.error('too few arguments to return', return_stmt.pos)
 		return
 	}
 	if return_stmt.exprs.len == 0 {
 		return
 	}
-	expected_type := c.unwrap_generic(c.expected_type)
-	expected_type_sym := c.table.get_type_symbol(expected_type)
 	exp_is_optional := expected_type.has_flag(.optional)
 	mut expected_types := [expected_type]
 	if expected_type_sym.kind == .multi_return {
@@ -2879,7 +2879,11 @@ pub fn (mut c Checker) expr(node ast.Expr) table.Type {
 				c.nr_warnings += c2.nr_warnings
 				c.nr_errors += c2.nr_errors
 			}
+			if node.method_name == 'html' {
 				return c.table.find_type_idx('vweb.Result')
+			} else {
+				return table.string_type
+			}
 			// return table.void_type
 		}
 		ast.ConcatExpr {

vlib/v/gen/comptime.v

@@ -9,18 +9,28 @@ import v.util
 
 fn (mut g Gen) comptime_call(node ast.ComptimeCall) {
 	if node.is_vweb {
+		is_html := node.method_name == 'html'
 		for stmt in node.vweb_tmpl.stmts {
 			if stmt is ast.FnDecl {
 				// insert stmts from vweb_tmpl fn
 				if stmt.name.starts_with('main.vweb_tmpl') {
+					if is_html {
 						g.inside_vweb_tmpl = true
+					}
 					g.stmts(stmt.stmts)
 					g.inside_vweb_tmpl = false
 					break
 				}
 			}
 		}
+		if is_html {
+			// return vweb html template
 			g.writeln('vweb__Context_html(&app->vweb, _tmpl_res_$g.fn_decl.name); strings__Builder_free(&sb); string_free(&_tmpl_res_$g.fn_decl.name);')
+		} else {
+			// return $tmpl string
+			fn_name := g.fn_decl.name.replace('.', '__')
+			g.writeln('return _tmpl_res_$fn_name;')
+		}
 		return
 	}
 	g.writeln('// $' + 'method call. sym="$node.sym.name"')

vlib/v/parser/comptime.v

@@ -46,32 +46,58 @@ fn (mut p Parser) hash() ast.HashStmt {
 
 fn (mut p Parser) vweb() ast.ComptimeCall {
 	p.check(.dollar)
-	p.check(.name) // skip `vweb.html()` TODO
+	error_msg := 'only `\$tmpl()` and `\$vweb.html()` comptime functions are supported right now'
+	if p.peek_tok.kind == .dot {
+		n := p.check_name() // skip `vweb.html()` TODO
+		if n != 'vweb' {
+			p.error(error_msg)
+		}
 		p.check(.dot)
-	p.check(.name)
+	}
+	n := p.check_name() // (.name)
+	if n != 'html' && n != 'tmpl' {
+		p.error(error_msg)
+	}
+	is_html := n == 'html'
 	p.check(.lpar)
+	s := if is_html { '' } else { p.tok.lit }
+	if !is_html {
+		p.check(.string)
+	}
+	println('SSSS "$s"')
 	p.check(.rpar)
 	// Compile vweb html template to V code, parse that V code and embed the resulting V function
 	// that returns an html string.
 	fn_path := p.cur_fn_name.split('_')
-	html_name := '${fn_path.last()}.html'
+	tmpl_path := if is_html { '${fn_path.last()}.html' } else { s }
 	// Looking next to the vweb program
 	dir := os.dir(p.scanner.file_path)
 	mut path := os.join_path(dir, fn_path.join('/'))
 	path += '.html'
+	if !is_html {
+		path = tmpl_path
+	}
 	if !os.exists(path) {
 		// can be in `templates/`
+		if is_html {
 			path = os.join_path(dir, 'templates', fn_path.join('/'))
 			path += '.html'
+		}
 		if !os.exists(path) {
+			if is_html {
 				p.error('vweb HTML template "$path" not found')
+			} else {
+				p.error('template file "$path" not found')
+			}
 		}
 		// println('path is now "$path"')
 	}
-	if p.pref.is_verbose {
-		println('>>> compiling vweb HTML template "$path"')
+	if true || p.pref.is_verbose {
+		println('>>> compiling comptime template file "$path"')
 	}
-	v_code := tmpl.compile_file(path, p.cur_fn_name)
+	tmp_fn_name := p.cur_fn_name.replace('.', '__')
+	v_code := tmpl.compile_file(path, tmp_fn_name)
+	println('done')
 	$if print_vweb_template_expansions ? {
 		lines := v_code.split('\n')
 		for i, line in lines {
@@ -82,22 +108,22 @@ fn (mut p Parser) vweb() ast.ComptimeCall {
 		start_pos: 0
 		parent: p.global_scope
 	}
-	mut file := parse_text(v_code, p.table, p.pref, scope, p.global_scope)
-	if p.pref.is_verbose {
+	if true || p.pref.is_verbose {
 		println('\n\n')
 		println('>>> vweb template for $path:')
 		println(v_code)
 		println('>>> end of vweb template END')
 		println('\n\n')
 	}
+	mut file := parse_text(v_code, p.table, p.pref, scope, p.global_scope)
 	file = {
 		file |
-		path: html_name
+		path: tmpl_path
 	}
 	// copy vars from current fn scope into vweb_tmpl scope
 	for stmt in file.stmts {
 		if stmt is ast.FnDecl {
-			if stmt.name == 'main.vweb_tmpl_$p.cur_fn_name' {
+			if stmt.name == 'main.vweb_tmpl_$tmp_fn_name' {
 				mut tmpl_scope := file.scope.innermost(stmt.body_pos.pos)
 				for _, obj in p.scope.objects {
 					if obj is ast.Var {
@@ -105,7 +131,7 @@ fn (mut p Parser) vweb() ast.ComptimeCall {
 						v.pos = stmt.body_pos
 						tmpl_scope.register(v.name, v)
 						// set the controller action var to used
-						// if its unused in the template it will warn
+						// if it's unused in the template it will warn
 						v.is_used = true
 					}
 				}
@@ -116,6 +142,7 @@ fn (mut p Parser) vweb() ast.ComptimeCall {
 	return ast.ComptimeCall{
 		is_vweb: true
 		vweb_tmpl: file
+		method_name: n
 	}
 }
 

vlib/v/tests/prod_test.v

@@ -5,7 +5,9 @@ import benchmark
 
 fn test_all_v_prod_files() {
 	// TODO: Fix running this test on Windows:
-	$if !windows {
+	$if windows {
+		return
+	}
 	options := runner.new_prod_options()
 	mut bmark := benchmark.new_benchmark()
 	for file in options.files {
@@ -24,4 +26,3 @@ fn test_all_v_prod_files() {
 	bmark.stop()
 	println(bmark.total_message('total time spent running PROD files'))
 }
-}

vlib/v/tests/tmpl/1.txt

@@ -0,0 +1,9 @@
+name: @name
+
+age: @age
+
+numbers: @numbers
+
+@for number in numbers
+@number
+@end

vlib/v/tests/tmpl_test.v

@@ -0,0 +1,21 @@
+fn one() string {
+	name := 'Peter'
+	age := 25
+	numbers := [1, 2, 3]
+	return $tmpl('tmpl/1.txt')
+}
+
+fn test_tmpl() {
+	assert one().trim_space() == 'name: Peter
+
+age: 25
+
+numbers: [1, 2, 3]
+
+
+1
+
+2
+
+3'
+}