vweb: fix duplicate fn error with multiple templates

vlib/strings/strings.v

@@ -0,0 +1,16 @@
+module strings
+
+//import rand
+
+// random returns a random string with `n` characters
+/*
+// TODO
+pub fn random(n int) string {
+	buf := vmalloc(n)
+	for i in 0..n {
+		buf[i] = rand.next()
+	}
+	return tos(buf)
+}
+*/
+

vlib/v/gen/comptime.v

@@ -12,7 +12,7 @@ fn (g &Gen) comptime_call(node ast.ComptimeCall) {
 			if stmt is ast.FnDecl {
 				fn_decl := stmt as ast.FnDecl
 				// insert stmts from vweb_tmpl fn
-				if fn_decl.name == 'vweb_tmpl' {
+				if fn_decl.name.starts_with('vweb_tmpl') {
 					g.stmts(fn_decl.stmts)
 					break
 				}

vlib/v/parser/comptime.v

@@ -100,7 +100,7 @@ fn (mut p Parser) vweb() ast.ComptimeCall {
 		}
 		// println('path is now "$path"')
 	}
-	v_code := tmpl.compile_file(path)
+	v_code := tmpl.compile_file(path, p.cur_fn_name)
 	mut scope := &ast.Scope{
 		start_pos: 0
 		parent: p.global_scope
@@ -117,7 +117,7 @@ fn (mut p Parser) vweb() ast.ComptimeCall {
 	for stmt in file.stmts {
 		if stmt is ast.FnDecl {
 			fn_decl := stmt as ast.FnDecl
-			if fn_decl.name == 'vweb_tmpl' {
+			if fn_decl.name.starts_with('vweb_tmpl') {
 				body_scope := file.scope.innermost(fn_decl.body_pos.pos)
 				for _, obj in p.scope.objects {
 					if obj is ast.Var {

vlib/vweb/tmpl/tmpl.v

@@ -12,14 +12,14 @@ const (
 )
 
 // compile_file compiles the content of a file by the given path as a template
-pub fn compile_file(path string) string {
+pub fn compile_file(path, fn_name string) string {
 	mut html := os.read_file(path) or {
 		panic('html failed')
 	}
-	return compile_template(html)
+	return compile_template(html, fn_name)
 }
 
-pub fn compile_template(content string) string {
+pub fn compile_template(content, fn_name string) string {
 	// lines := os.read_lines(path)
 	mut html := content
 	mut header := ''
@@ -36,7 +36,7 @@ pub fn compile_template(content string) string {
 	s.writeln("
 	import strings
 	// === vweb html template ===
-	fn vweb_tmpl() {
+	fn vweb_tmpl_${fn_name}() {
 	mut sb := strings.new_builder(${lines.len * 30})
 	header := \' \' // TODO remove
 	_ = header