add basic window abstraction

1 files changed, 43 insertions, 0 deletions

diff --git a/src/window.rs b/src/window.rs
new file mode 100644
index 0000000..178c484
--- /dev/null
+++ b/src/window.rs
@@ -0,0 +1,43 @@
+//! A window is an abstraction for the UI. Buffers (like [Threads]) draw "to" windows.
+
+use std::io::Write;
+use termion::{clear, color, cursor};
+
+pub enum Line {
+    Normal(String),
+    Highlight(String),
+}
+
+pub struct Window {
+    pub lines: Vec<Line>,
+}
+
+impl Window {
+    pub fn new() -> Self {
+        Self {
+            lines: Vec::new(),
+        }
+    }
+
+    pub fn draw<W: Write>(&mut self, out: &mut W) -> Result<(), std::io::Error> {
+        write!(out, "{}", clear::All)?;
+
+        for (i, line) in self.lines.iter().enumerate() {
+            write!(out, "{}", cursor::Goto(1, (i + 1) as u16))?;
+            match line {
+                Line::Normal(s) => write!(out, "{}", s)?,
+                Line::Highlight(s) => write!(
+                    out,
+                    "{}{}{}",
+                    color::Fg(color::Red),
+                    s,
+                    color::Fg(color::Reset),
+                )?,
+            }
+        }
+        out.flush()?;
+
+        self.lines.clear();
+        Ok(())
+    }
+}