added NONE Terminator

csv-core/src/lib.rs

@@ -120,6 +120,9 @@ pub enum Terminator {
     CRLF,
     /// Parses the byte given as a record terminator.
     Any(u8),
+    /// Disable line terminator
+    /// This is useful when writing single line field by field with proper qoting
+    NONE,
     /// Hints that destructuring should not be exhaustive.
     ///
     /// This enum may grow additional variants, so this makes sure clients

csv-core/src/writer.rs

@@ -54,6 +54,9 @@ impl WriterBuilder {
             Any(b) => {
                 wtr.requires_quotes[b as usize] = true;
             }
+            NONE => {
+                wtr.requires_quotes[usize::MIN] = true;
+            }
             _ => unreachable!(),
         }
         wtr
@@ -375,6 +378,7 @@ impl Writer {
         let (res, o) = match self.term {
             Terminator::CRLF => write_pessimistic(&[b'\r', b'\n'], output),
             Terminator::Any(b) => write_pessimistic(&[b], output),
+            Terminator::NONE => write_pessimistic(&[], output),
             _ => unreachable!(),
         };
         if o == 0 {

src/lib.rs

@@ -221,6 +221,9 @@ pub enum Terminator {
     CRLF,
     /// Parses the byte given as a record terminator.
     Any(u8),
+    /// Disable line terminator
+    /// This is useful when writing single line field by field with proper qoting
+    NONE,
     /// Hints that destructuring should not be exhaustive.
     ///
     /// This enum may grow additional variants, so this makes sure clients
@@ -236,6 +239,7 @@ impl Terminator {
         match self {
             Terminator::CRLF => csv_core::Terminator::CRLF,
             Terminator::Any(b) => csv_core::Terminator::Any(b),
+            Terminator::NONE => csv_core::Terminator::NONE,
             _ => unreachable!(),
         }
     }

src/writer.rs

@@ -1127,6 +1127,7 @@ impl<W: io::Write> Writer<W> {
                 self.buf.writable()[0] = b;
                 self.buf.written(1);
             }
+            csv_core::Terminator::NONE => {}
             _ => unreachable!(),
         }
         self.state.fields_written = 0;
@@ -1414,4 +1415,14 @@ mod tests {
         wtr.serialize((true, 1.3, "hi")).unwrap();
         assert_eq!(wtr_as_string(wtr), "true,1.3,hi\n");
     }
+
+    #[test]
+    fn quoting_witout_terminator_char() {
+        let mut wtr = WriterBuilder::new()
+            .terminator(crate::Terminator::NONE)
+            .from_writer(vec![]);
+
+        wtr.write_record(&["foo \" bar"]).unwrap();
+        assert_eq!(wtr_as_string(wtr), "\"foo \"\" bar\"");
+    }
 }