Reorganize commands module

src/commands/types.rs

@@ -0,0 +1,43 @@
+use std::fmt;
+
+/// DTC (diagnostic trouble code) metadata
+#[derive(Debug)]
+#[non_exhaustive]
+pub struct DtcsInfo {
+    /// Whether the "check engine" light is illuminated
+    pub malfunction_indicator_light: bool,
+
+    /// Number of DTCs for this ECU
+    pub dtc_count: u8,
+
+    /// Bit field showing availability of seven common tests; the upper bit is currently unused.
+    pub common_test_availability: u8,
+
+    /// Whether the engine is Diesel
+    pub is_compression_engine: bool,
+
+    /// Bit field showing availability of sixteen engine-specific tests. What the tests are is
+    /// based on the value of `is_compression_engine`.
+    pub specific_test_availability: u16,
+}
+
+/// An individual trouble code from an ECU
+#[derive(Debug)]
+pub enum Dtc {
+    Powertrain(u16),
+    Chassis(u16),
+    Body(u16),
+    Network(u16),
+}
+
+impl fmt::Display for Dtc {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let (c, n) = match self {
+            Self::Powertrain(n) => ('P', n),
+            Self::Chassis(n) => ('C', n),
+            Self::Body(n) => ('B', n),
+            Self::Network(n) => ('U', n),
+        };
+        f.write_fmt(format_args!("{}{:03X}", c, n))
+    }
+}