Pg to bun (#148)

* start moving to bun

* changing more stuff

* more

* and yet more

* tests passing

* seems stable now

* more big changes

* small fix

* little fixes

vendor/github.com/uptrace/bun/internal/hex.go

@@ -0,0 +1,43 @@
+package internal
+
+import (
+	fasthex "github.com/tmthrgd/go-hex"
+)
+
+type HexEncoder struct {
+	b       []byte
+	written bool
+}
+
+func NewHexEncoder(b []byte) *HexEncoder {
+	return &HexEncoder{
+		b: b,
+	}
+}
+
+func (enc *HexEncoder) Bytes() []byte {
+	return enc.b
+}
+
+func (enc *HexEncoder) Write(b []byte) (int, error) {
+	if !enc.written {
+		enc.b = append(enc.b, '\'')
+		enc.b = append(enc.b, `\x`...)
+		enc.written = true
+	}
+
+	i := len(enc.b)
+	enc.b = append(enc.b, make([]byte, fasthex.EncodedLen(len(b)))...)
+	fasthex.Encode(enc.b[i:], b)
+
+	return len(b), nil
+}
+
+func (enc *HexEncoder) Close() error {
+	if enc.written {
+		enc.b = append(enc.b, '\'')
+	} else {
+		enc.b = append(enc.b, "NULL"...)
+	}
+	return nil
+}