feat: basic list command

src/backup/manager/meta.rs

@@ -127,4 +127,8 @@ where
             .get(layer)
             .map(|manager| manager.restore_backup(start_time))
     }
+
+    pub fn managers(&self) -> &HashMap<String, Manager<T>> {
+        &self.managers
+    }
 }

src/backup/manager/mod.rs

@@ -181,4 +181,9 @@ where
 
         Err(other("Unknown backup."))
     }
+
+    /// Get a reference to the underlying chains
+    pub fn chains(&self) -> &Vec<Vec<Backup<T>>> {
+        &self.chains
+    }
 }

src/cli/backup.rs

@@ -9,7 +9,7 @@ use std::path::PathBuf;
 #[derive(Subcommand)]
 pub enum BackupCommands {
     /// List all tracked backups
-    List,
+    List(BackupListArgs),
     /// Manually create a new backup
     Create(BackupCreateArgs),
     /// Restore a backup
@@ -28,6 +28,12 @@ pub struct BackupCreateArgs {
     layer: String,
 }
 
+#[derive(Args)]
+pub struct BackupListArgs {
+    /// What layer to list
+    layer: Option<String>,
+}
+
 #[derive(Args)]
 pub struct BackupRestoreArgs {
     /// Path to the backup inside the backup directory
@@ -41,7 +47,7 @@ impl BackupArgs {
     pub fn run(&self, cli: &Cli) -> io::Result<()> {
         match &self.command {
             BackupCommands::Create(args) => args.run(cli),
-            BackupCommands::List => Ok(()),
+            BackupCommands::List(args) => args.run(cli),
             BackupCommands::Restore(args) => args.run(cli),
         }
     }
@@ -120,3 +126,25 @@ impl BackupRestoreArgs {
         }
     }
 }
+
+impl BackupListArgs {
+    pub fn run(&self, cli: &Cli) -> io::Result<()> {
+        let meta = cli.meta()?;
+
+        for (name, manager) in meta.managers().iter() {
+            println!("{}", name);
+
+            for chain in manager.chains().iter().filter(|c| !c.is_empty()) {
+                let mut iter = chain.iter();
+                let first = iter.next().unwrap();
+                println!("  {}", first.start_time.format(Backup::FILENAME_FORMAT));
+
+                for backup in iter {
+                    println!("    {}", backup.start_time.format(Backup::FILENAME_FORMAT));
+                }
+            }
+        }
+
+        Ok(())
+    }
+}