rustfmt config + format stable files

rustfmt.toml

@@ -0,0 +1,6 @@
+edition = "2021"
+newline_style = "Unix"
+match_block_trailing_comma = true
+fn_params_layout = "Compressed"
+use_field_init_shorthand = true
+use_small_heuristics = "Max"

src/key_value.rs

@@ -1,7 +1,7 @@
-use rusqlite::{Connection, Result, params};
-use std::ops::Index;
+use rusqlite::{params, Connection, Result};
 use std::cell::Cell;
 use std::collections::HashSet;
+use std::ops::Index;
 
 /// Simple SQLite-backed key/value store.
 ///
@@ -27,7 +27,7 @@ impl KeyValueStore {
               )",
             [],
         )?;
-        Ok(Self { conn, has_write_errors: Cell::new(false), })
+        Ok(Self { conn, has_write_errors: Cell::new(false) })
     }
 
     /// Report if any write errors occurred.
@@ -53,11 +53,13 @@ impl KeyValueStore {
     /// Will panic on error. (The idea is to call this a bunch of times at boot,
     /// to populate the DB if missing / newly created, and not use it after.)
     pub fn default(&self, key: &str, value: &str) {
-        self.conn.execute(
+        self.conn
+            .execute(
                 "INSERT INTO kv_store (key, value) VALUES (?1, ?2)
                  ON CONFLICT(key) DO NOTHING",
                 params![key, value],
-        ).expect(&format!("Failed to write default at key: {}", key));
+            )
+            .expect(&format!("Failed to write default at key: {}", key));
     }
 
     /// Write a `key`/`value` pair to the DB.
@@ -74,7 +76,7 @@ impl KeyValueStore {
                 eprintln!("Failed DB write: ({}, {})", key, value);
                 self.has_write_errors.set(true);
                 Err(e)
-            }
+            },
         }
     }
 
@@ -88,7 +90,7 @@ impl KeyValueStore {
                 eprintln!("Failed DB write: ({}, NULL)", key);
                 self.has_write_errors.set(true);
                 Err(e)
-            }
+            },
         }
     }