veb: deprecate vweb (part 1); update the blog tutorial

cmd/tools/gen_vc.v

@@ -4,7 +4,7 @@ import os
 import log
 import flag
 import time
-import vweb
+import veb
 import net.urllib
 
 // This tool regenerates V's bootstrap .c files
@@ -79,11 +79,14 @@ mut:
 
 // webhook server
 struct WebhookServer {
-	vweb.Context
 mut:
 	gen_vc &GenVC = unsafe { nil } // initialized in init_server
 }
 
+struct Context {
+	veb.Context
+}
+
 // storage for flag options
 struct FlagOptions {
 	work_dir string
@@ -116,7 +119,8 @@ fn main() {
 	}
 	// webhook server mode
 	if flag_options.serve {
-		vweb.run[WebhookServer](&WebhookServer{}, flag_options.port)
+		mut server := &WebhookServer{}
+		veb.run_at[WebhookServer, Context](mut server, port: flag_options.port)!
 	} else {
 		// cmd mode
 		mut gen_vc := new_gen_vc(flag_options)
@@ -152,18 +156,17 @@ pub fn (mut ws WebhookServer) index() {
 }
 
 // gen webhook
-pub fn (mut ws WebhookServer) genhook() {
+pub fn (mut ws WebhookServer) genhook() veb.Result {
 	// request data
 	// println(ws.vweb.req.data)
 	// TODO: parse request. json or urlencoded
 	// json.decode or net.urllib.parse
 	ws.gen_vc.generate()
 	// error in generate
 	if ws.gen_vc.gen_error {
-		ws.json('{status: "failed"}')
-		return
+		return ctx.json('{status: "failed"}')
 	}
-	ws.json('{status: "ok"}')
+	return ctx.json('{status: "ok"}')
 }
 
 pub fn (ws &WebhookServer) reset() {