vweb: bring back @header

vlib/vweb/tmpl/tmpl.v

@@ -26,22 +26,36 @@ enum State {
 	//span // span.{
 }
 
-pub fn compile_template(content, fn_name string) string {
+pub fn compile_template(html_, fn_name string) string {
 	// lines := os.read_lines(path)
-	mut html := content
-	lines := html.split_into_lines()
+	mut html := html_
+	mut header := ''
+if os.exists('templates/header.html') && html.contains('@header') {
+        h := os.read_file('templates/header.html') or {
+                panic('reading file templates/header.html failed')
+        }
+        header = h.replace("\'", '"')
+        html = header + html
+}
+
+	mut lines := html.split_into_lines()
 	mut s := strings.new_builder(1000)
 	// base := path.all_after_last('/').replace('.html', '')
 	s.writeln("
-	import strings
-	// === vweb html template ===
-	fn vweb_tmpl_${fn_name}() {
-	mut sb := strings.new_builder(${lines.len * 30})\n")
+import strings
+// === vweb html template ===
+fn vweb_tmpl_${fn_name}() {
+mut sb := strings.new_builder(${lines.len * 30})\n
+header := \' \' // TODO remove
+_ = header
+
+")
 	s.writeln(str_start)
 	mut state := State.html
 	mut in_span := false
-	for _line in lines {
-		line := _line.trim_space()
+	//for _line in lines {
+	for i := 0; i < lines.len; i ++ {
+		line := lines[i].trim_space()
 		if line == '<style>' {
 			state = .css
 		} else if line == '</style>' {
@@ -53,7 +67,8 @@ pub fn compile_template(content, fn_name string) string {
 		else if line == '</script>' {
 			state = .html
 		}
-		if line.contains('@include ') {
+		// TODO
+		if line.contains('@include ') && false {
 			pos := line.index('@include ') or {
 				continue
 			}
@@ -63,7 +78,12 @@ pub fn compile_template(content, fn_name string) string {
 				panic('reading file $file_name failed')
 			}
 			file_content = file_content.replace("\'", '"')
-			s.writeln(file_content)
+			lines2 := file_content.split_into_lines()
+			for l in lines2 {
+				lines.insert(i+1, l)
+			}
+			continue
+			//s.writeln(file_content)
 		} else if line.contains('@if ') {
 			s.writeln(str_end)
 			pos := line.index('@if') or {