tutorials: web blog fixes

tutorials/code/blog/article.v

@@ -7,9 +7,9 @@ struct Article {
 }
 
 pub fn (app &App) find_all_articles() []Article {
-	db := app.db
-	articles := db.select from Article
-	return articles
+	return sql app.db {
+		select from Article
+	}
 }
 
 

tutorials/code/blog/blog.v

@@ -2,17 +2,17 @@ module main
 
 import vweb
 import time
-import pg
+import sqlite
 import json
 
-pub struct App {
-mut:
+struct App {
+pub mut:
 	vweb vweb.Context
-	db pg.DB
+	db sqlite.DB
 }
 
 fn main() {
-	vweb.run<App>(8080)
+	vweb.run<App>(8081)
 }
 
 fn (mut app App) index_text() {
@@ -26,42 +26,39 @@ fn (app &App) index_html() {
 }
 */
 
-fn (app &App) index() {
+fn (app &App) index() vweb.Result {
 	articles := app.find_all_articles()
-	$vweb.html()
+	return $vweb.html()
 }
 
-pub fn (mut app App) init() {
-	db := pg.connect(pg.Config{
-		host:   '127.0.0.1'
-		dbname: 'blog'
-		user:   'alex'
-	}) or { panic(err) }
+pub fn (mut app App) init_once() {
+	db := sqlite.connect(':memory:') 	or { panic(err) }
 	app.db = db
 }
 
-pub fn (mut app App) new() {
-	$vweb.html()
+pub fn (mut app App) init() {
 }
 
-pub fn (mut app App) reset() {
+pub fn (mut app App) new() vweb.Result{
+	return $vweb.html()
 }
 
-pub fn (mut app App) new_article() {
+pub fn (mut app App) new_article() vweb.Result {
 	title := app.vweb.form['title']
 	text := app.vweb.form['text']
 	if title == '' || text == ''  {
 		app.vweb.text('Empty text/titile')
-		return
+		return vweb.Result{}
 	}
 	article := Article{
 		title: title
 		text: text
 	}
 	println(article)
-	db := app.db
-	db.insert(article)
-	app.vweb.redirect('/article/')
+	sql app.db {
+		insert article into Article
+	}
+	return app.vweb.redirect('/article/')
 }
 
 pub fn (mut app App) articles() {

vlib/vweb/vweb.v

@@ -92,10 +92,11 @@ pub fn (mut ctx Context) ok(s string) Result {
 	return Result{}
 }
 
-pub fn (mut ctx Context) redirect(url string) {
-	if ctx.done { return }
+pub fn (mut ctx Context) redirect(url string) Result {
+	if ctx.done { return Result{} }
 	ctx.done = true
-	ctx.conn.send_string('HTTP/1.1 302 Found\r\nLocation: ${url}${ctx.headers}\r\n${headers_close}') or { return }
+	ctx.conn.send_string('HTTP/1.1 302 Found\r\nLocation: ${url}${ctx.headers}\r\n${headers_close}') or { return Result{} }
+	return Result{}
 }
 
 pub fn (mut ctx Context) not_found() Result {