move db files command w/ filter args; misc related cleanup

Signed-off-by: Jason Volk <jason@zemos.net>

src/database/engine/files.rs

@@ -1,32 +1,15 @@
-use std::fmt::Write;
-
 use conduwuit::{implement, Result};
+use rocksdb::LiveFile as SstFile;
 
 use super::Engine;
+use crate::util::map_err;
 
 #[implement(Engine)]
-pub fn file_list(&self) -> Result<String> {
-	match self.db.live_files() {
-		| Err(e) => Ok(String::from(e)),
-		| Ok(mut files) => {
-			files.sort_by_key(|f| f.name.clone());
-			let mut res = String::new();
-			writeln!(res, "| lev  | sst  | keys | dels | size | column |")?;
-			writeln!(res, "| ---: | :--- | ---: | ---: | ---: | :---   |")?;
-			for file in files {
-				writeln!(
-					res,
-					"| {} | {:<13} | {:7}+ | {:4}- | {:9} | {} |",
-					file.level,
-					file.name,
-					file.num_entries,
-					file.num_deletions,
-					file.size,
-					file.column_family_name,
-				)?;
-			}
-
-			Ok(res)
-		},
-	}
+pub fn file_list(&self) -> impl Iterator<Item = Result<SstFile>> + Send {
+	self.db
+		.live_files()
+		.map_err(map_err)
+		.into_iter()
+		.flat_map(Vec::into_iter)
+		.map(Ok)
 }