v orm: select

vlib/strings/builder.c.v

@@ -49,6 +49,24 @@ pub fn (mut b Builder) go_back(n int) {
 	b.len -= n
 }
 
+pub fn (mut b Builder) cut_last(n int) string {
+	buf := b.buf[b.len-n..]
+	s := string(buf.clone())
+	b.buf.trim(b.buf.len-n)
+	b.len -= n
+	return s
+}
+
+/*
+pub fn (mut b Builder) cut_to(pos int) string {
+	buf := b.buf[pos..]
+	s := string(buf.clone())
+	b.buf.trim(pos)
+	b.len = pos
+	return s
+}
+*/
+
 pub fn (mut b Builder) go_back_to(pos int) {
 	b.buf.trim(pos)
 	b.len = pos

vlib/strings/builder_test.v

@@ -8,11 +8,25 @@ fn test_sb() {
 	assert sb.len == 8
 	assert sb.str() == 'hi!hello'
 	assert sb.len == 0
+	///
 	sb = strings.new_builder(10)
 	sb.write('a')
 	sb.write('b')
 	assert sb.len == 2
 	assert sb.str() == 'ab'
+	///
+	sb = strings.new_builder(10)
+	sb.write('123456')
+	assert sb.cut_last(2) == '56'
+	assert sb.str() == '1234'
+	///
+	/*
+	sb = strings.new_builder(10)
+	sb.write('123456')
+	x := sb.cut_to(2)
+	assert x == '456'
+	assert sb.str() == '123'
+	*/
 }
 
 const (