fix a bug in strings.Builder and wrap up vfmt

vlib/compiler/scanner.v

@@ -76,7 +76,7 @@ fn new_scanner_file(file_path string) &Scanner {
 fn new_scanner(text string) &Scanner {
 	return &Scanner {
 		text: text
-		fmt_out: strings.new_builder(10000)
+		fmt_out: strings.new_builder(1000)
 		should_print_line_on_error: true
 		should_print_errors_in_color: true
 		should_print_relative_paths_on_error: true

vlib/compiler/struct.v

@@ -238,7 +238,6 @@ fn (p mut Parser) struct_init(typ string) string {
 		p.warn('type `$t.name` is private')
 	}	
 	if p.gen_struct_init(typ, t) { return typ }
-	p.scanner.fmt_out.cut(typ.len)
 	ptr := typ.contains('*')
 	mut did_gen_something := false
 	// Loop thru all struct init keys and assign values

vlib/compiler/vfmt.v

@@ -13,6 +13,8 @@ fn (scanner mut Scanner) fgen(s_ string) {
 	if scanner.fmt_line_empty {
 		s = strings.repeat(`\t`, scanner.fmt_indent) + s
 	}
+	
+	//scanner.fmt_out << s
 	scanner.fmt_out.write(s)
 	scanner.fmt_line_empty = false
 }
@@ -23,6 +25,8 @@ fn (scanner mut Scanner) fgenln(s_ string) {
 	if scanner.fmt_line_empty {
 		s = strings.repeat(`\t`, scanner.fmt_indent) + s
 	}
+	//scanner.fmt_out << s
+	//scanner.fmt_out << '\n'
 	scanner.fmt_out.writeln(s)
 	scanner.fmt_line_empty = true
 }
@@ -111,6 +115,7 @@ fn (p mut Parser) fnext() {
 	}
 }
 
+
 [if vfmt]
 fn (p mut Parser) gen_fmt() {
 	if p.pass != .main {
@@ -120,6 +125,7 @@ fn (p mut Parser) gen_fmt() {
 		return
 	}	
 	s := p.scanner.fmt_out.str().trim_space()
+	//s := p.scanner.fmt_out.join('').trim_space()
 	if s == '' {
 		return
 	}	
@@ -128,8 +134,7 @@ fn (p mut Parser) gen_fmt() {
 		verror('failed to create fmt.v')
 		return
 	}
-	//println(p.scanner.fmt_out.str())
-	out.writeln(p.scanner.fmt_out.str().trim_space())
+	out.writeln(s)//p.scanner.fmt_out.str().trim_space())
 	out.close()
 }
 

vlib/strings/builder_c.v

@@ -13,17 +13,23 @@ pub:
 
 pub fn new_builder(initial_size int) Builder {
 	return Builder {
-		buf: make(0, initial_size, sizeof(byte))
+		buf: make(0, initial_size, 1)
 	}
 }
 
 pub fn (b mut Builder) write(s string) {
 	b.buf.push_many(s.str, s.len)
+	//for c in s {
+		//b.buf << c
+	//}	
 	//b.buf << []byte(s)  // TODO
 	b.len += s.len
 }
 
 pub fn (b mut Builder) writeln(s string) {
+	//for c in s {
+		//b.buf << c
+	//}	
 	b.buf.push_many(s.str, s.len)
 	//b.buf << []byte(s)  // TODO
 	b.buf << `\n`
@@ -34,10 +40,6 @@ pub fn (b Builder) str() string {
 	return string(b.buf, b.len)
 }
 
-pub fn (b mut Builder) cut(n int) {
-	b.len -= n
-}
-
 pub fn (b mut Builder) free() {
 	//free(b.buf.data)
 }

vlib/strings/builder_test.v

@@ -6,11 +6,13 @@ fn test_sb() {
 	sb.write('!')
 	sb.write('hello')
 	assert sb.str() == 'hi!hello'
+	assert sb.len == 8
 	sb = strings.new_builder(10)
 	sb.write('a')
 	sb.write('b')
 	println(sb.str())
 	assert sb.str() == 'ab'
+	assert sb.len == 2
 }
 
 const (
@@ -19,8 +21,10 @@ const (
 
 fn test_big_sb() {
 	mut sb := strings.new_builder(100)
+	mut sb2 := strings.new_builder(10000)
 	for i in 0..n {
 		sb.writeln(i.str())
+		sb2.write('+')
 	}	
 	s := sb.str()
 	lines := s.split_into_lines()
@@ -29,6 +33,8 @@ fn test_big_sb() {
 	assert lines[1] == '1'
 	assert lines[777] == '777'
 	assert lines[98765] == '98765'
+	println(sb2.len)
+	assert sb2.len == n
 	
 }