rustic_core: Add NoProgress and NoProgressBars (e.g. for examples)

crates/rustic_core/src/lib.rs

@@ -130,7 +130,7 @@ pub use crate::{
         indexer::Indexer,
         IndexBackend, IndexEntry, IndexedBackend, ReadIndex,
     },
-    progress::{Progress, ProgressBars},
+    progress::{NoProgress, NoProgressBars, Progress, ProgressBars},
     repofile::{
         configfile::ConfigFile,
         indexfile::{IndexBlob, IndexFile, IndexPack},

crates/rustic_core/src/progress.rs

@@ -15,3 +15,32 @@ pub trait ProgressBars {
     fn progress_hidden(&self) -> Self::P;
     fn progress_bytes(&self, prefix: impl Into<Cow<'static, str>>) -> Self::P;
 }
+
+#[derive(Clone)]
+pub struct NoProgress;
+impl Progress for NoProgress {
+    fn is_hidden(&self) -> bool {
+        true
+    }
+    fn set_length(&self, _len: u64) {}
+    fn set_title(&self, _title: &'static str) {}
+    fn inc(&self, _inc: u64) {}
+    fn finish(&self) {}
+}
+
+pub struct NoProgressBars;
+impl ProgressBars for NoProgressBars {
+    type P = NoProgress;
+    fn progress_spinner(&self, _prefix: impl Into<Cow<'static, str>>) -> Self::P {
+        NoProgress
+    }
+    fn progress_counter(&self, _prefix: impl Into<Cow<'static, str>>) -> Self::P {
+        NoProgress
+    }
+    fn progress_hidden(&self) -> Self::P {
+        NoProgress
+    }
+    fn progress_bytes(&self, _prefix: impl Into<Cow<'static, str>>) -> Self::P {
+        NoProgress
+    }
+}