feat: add progress reporting

Sponsored-by: author

1 files changed, 40 insertions, 0 deletions

diff --git a/src/progress.rs b/src/progress.rs
new file mode 100644
index 0000000..52ade35
--- /dev/null
+++ b/src/progress.rs
@@ -0,0 +1,40 @@
+//! Show progress, or not.
+
+#[derive(Debug, Clone, Copy)]
+pub enum MessageKind {
+    OnlyErrors,
+    Steps,
+    Everything,
+}
+
+pub struct Progress {
+    level: MessageKind,
+}
+
+impl Progress {
+    pub fn new(level: MessageKind) -> Self {
+        Self { level }
+    }
+
+    fn message(&self, prefix: &str, msg: &str) {
+        eprintln!("{}: {}", prefix, msg);
+    }
+
+    pub fn chatty(&self, msg: &str) {
+        if let MessageKind::Everything = self.level {
+            self.message("DEBUG", msg);
+        }
+    }
+
+    pub fn step(&self, msg: &str) {
+        match self.level {
+            MessageKind::Everything | MessageKind::Steps => self.message("INFO", msg),
+            _ => (),
+        }
+    }
+
+    pub fn error(&self, msg: &str) {
+        // Errors are always written out.
+        self.message("ERROR", msg);
+    }
+}