From da463e1ab80793bd87f3ecb523e8a0fe137d89af Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Sat, 6 Mar 2021 14:42:01 -0500
Subject: add a Write implementation for Parser

---
 CHANGELOG.md   |  6 ++++++
 src/parser.rs  | 11 +++++++++++
 tests/write.rs | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 77 insertions(+)
 create mode 100644 tests/write.rs

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 41af44a..277b879 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Changelog
 
+## [Unreleased]
+
+### Added
+
+* Implementation of `std::io::Write` for `Parser`
+
 ## [0.9.0] - 2021-03-05
 
 ### Added
diff --git a/src/parser.rs b/src/parser.rs
index 45bef2f..26431ac 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -61,3 +61,14 @@ impl Default for Parser {
         Self::new(24, 80, 0)
     }
 }
+
+impl std::io::Write for Parser {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        self.process(buf);
+        Ok(buf.len())
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        Ok(())
+    }
+}
diff --git a/tests/write.rs b/tests/write.rs
new file mode 100644
index 0000000..0b1d5fe
--- /dev/null
+++ b/tests/write.rs
@@ -0,0 +1,60 @@
+use std::io::Write as _;
+
+#[test]
+fn write_text() {
+    let mut parser = vt100::Parser::default();
+    let input = b"foo\x1b[31m\x1b[32mb\x1b[3;7;42ma\x1b[23mr";
+    let bytes = parser.write(input).unwrap();
+    assert_eq!(bytes, input.len());
+    assert_eq!(parser.screen().contents(), "foobar");
+}
+
+#[test]
+fn cell_contents() {
+    let mut parser = vt100::Parser::default();
+    let input = b"foo\x1b[31m\x1b[32mb\x1b[3;7;42ma\x1b[23mr";
+    let bytes = parser.write(input).unwrap();
+    assert_eq!(bytes, input.len());
+    assert_eq!(parser.screen().cell(0, 0).unwrap().contents(), "f");
+    assert_eq!(parser.screen().cell(0, 1).unwrap().contents(), "o");
+    assert_eq!(parser.screen().cell(0, 2).unwrap().contents(), "o");
+    assert_eq!(parser.screen().cell(0, 3).unwrap().contents(), "b");
+    assert_eq!(parser.screen().cell(0, 4).unwrap().contents(), "a");
+    assert_eq!(parser.screen().cell(0, 5).unwrap().contents(), "r");
+    assert_eq!(parser.screen().cell(0, 6).unwrap().contents(), "");
+}
+
+#[test]
+fn cell_colors() {
+    let mut parser = vt100::Parser::default();
+    let input = b"foo\x1b[31m\x1b[32mb\x1b[3;7;42ma\x1b[23mr";
+    let bytes = parser.write(input).unwrap();
+    assert_eq!(bytes, input.len());
+
+    assert_eq!(
+        parser.screen().cell(0, 0).unwrap().fgcolor(),
+        vt100::Color::Default
+    );
+    assert_eq!(
+        parser.screen().cell(0, 3).unwrap().fgcolor(),
+        vt100::Color::Idx(2)
+    );
+    assert_eq!(
+        parser.screen().cell(0, 4).unwrap().fgcolor(),
+        vt100::Color::Idx(2)
+    );
+    assert_eq!(
+        parser.screen().cell(0, 4).unwrap().bgcolor(),
+        vt100::Color::Idx(2)
+    );
+}
+
+#[test]
+fn cell_attrs() {
+    let mut parser = vt100::Parser::default();
+    let input = b"foo\x1b[31m\x1b[32mb\x1b[3;7;42ma\x1b[23mr";
+    let bytes = parser.write(input).unwrap();
+    assert_eq!(bytes, input.len());
+
+    assert!(parser.screen().cell(0, 4).unwrap().italic());
+}
-- 
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