compiler: improve error handling for 'v install'

compiler/main.v

@@ -141,14 +141,19 @@ fn main() {
 		if true {
 			//println('Building vget...')
 			os.chdir(vroot + '/tools')
-			_ := os.exec('$vexec -o $vget vget.v') or {
+			vgetcompilation := os.exec('$vexec -o $vget vget.v') or {
 				panic(err)
 			}
+			if vgetcompilation.exit_code != 0 {
+				panic( vgetcompilation.output )
 			}
-
+		}
-		_ := os.exec('$vget ' + names.join(' ')) or {
+		vgetresult := os.exec('$vget ' + names.join(' ')) or {
 			panic(err)
 		}
+		if vgetresult.exit_code != 0 {
+			panic( vgetresult.output )
+		}
 		return
 	}
 	// TODO quit if the compiler is too old

tools/vget.v

@@ -35,17 +35,32 @@ fn main() {
 	mut errors := 0
 	names := os.args.slice(1, os.args.len)
 	for name in names {
-		s := http.get_text(url + '/jsmod/$name')
+		modurl := url + '/jsmod/$name'
+		r := http.get(modurl) or { panic(err) }
+		
+		if r.status_code == 404 {
+			println('Skipping module "$name", since $url reported that "$name" does not exist.')
+			errors++
+			continue
+        	}
+		
+        	if r.status_code != 200 {
+			println('Skipping module "$name", since $url responded with $r.status_code http status code. Please try again later.')
+			errors++
+			continue
+		}
+		
+		s := r.text
 		mod := json.decode(Mod, s) or {
 			errors++
-			println('Error. Make sure you are online.')
+			println('Skipping module "$name", since its information is not in json format.')
 			continue
 		}
 		
 		if( '' == mod.url || '' == mod.name ){
 			errors++
 			// a possible 404 error, which means a missing module?
-			println('Skipping module "$name", since it does not exist.')
+			println('Skipping module "$name", since it is missing name or url information.')
 			continue
 		}