From 834398111bb56bbc4302594e38beb91fa941291a Mon Sep 17 00:00:00 2001
From: Michael Macias <zaeleus@gmail.com>
Date: Thu, 12 Sep 2024 10:15:00 -0500
Subject: [PATCH] vcf/io/writer/record/info/field/value: Add character writer

---
 .../src/io/writer/record/info/field/value.rs  |  5 ++--
 .../record/info/field/value/character.rs      | 28 +++++++++++++++++++
 2 files changed, 31 insertions(+), 2 deletions(-)
 create mode 100644 noodles-vcf/src/io/writer/record/info/field/value/character.rs

diff --git a/noodles-vcf/src/io/writer/record/info/field/value.rs b/noodles-vcf/src/io/writer/record/info/field/value.rs
index 489c621e3..a9f4b9bf9 100644
--- a/noodles-vcf/src/io/writer/record/info/field/value.rs
+++ b/noodles-vcf/src/io/writer/record/info/field/value.rs
@@ -1,9 +1,10 @@
 mod array;
+mod character;
 mod string;
 
 use std::io::{self, Write};
 
-use self::{array::write_array, string::write_string};
+use self::{array::write_array, character::write_character, string::write_string};
 use crate::variant::record::info::field::Value;
 
 pub(super) fn write_value<W>(writer: &mut W, value: &Value) -> io::Result<()>
@@ -14,7 +15,7 @@ where
         Value::Integer(n) => write!(writer, "{n}"),
         Value::Float(n) => write!(writer, "{n}"),
         Value::Flag => Ok(()),
-        Value::Character(c) => write!(writer, "{c}"),
+        Value::Character(c) => write_character(writer, *c),
         Value::String(s) => write_string(writer, s),
         Value::Array(array) => write_array(writer, array),
     }
diff --git a/noodles-vcf/src/io/writer/record/info/field/value/character.rs b/noodles-vcf/src/io/writer/record/info/field/value/character.rs
new file mode 100644
index 000000000..44837b97b
--- /dev/null
+++ b/noodles-vcf/src/io/writer/record/info/field/value/character.rs
@@ -0,0 +1,28 @@
+use std::io::{self, Write};
+
+pub(super) fn write_character<W>(writer: &mut W, c: char) -> io::Result<()>
+where
+    W: Write,
+{
+    write!(writer, "{c}")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_write_character() -> io::Result<()> {
+        let mut buf = Vec::new();
+
+        buf.clear();
+        write_character(&mut buf, 'n')?;
+        assert_eq!(buf, b"n");
+
+        buf.clear();
+        write_character(&mut buf, ':')?;
+        assert_eq!(buf, b":"); // FIXME
+
+        Ok(())
+    }
+}