Add plugin properties to settings cache key (#559)

src/flake8_quotes/settings.rs

@@ -2,7 +2,7 @@
 
 use serde::{Deserialize, Serialize};
 
-#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize, Hash)]
 #[serde(deny_unknown_fields, rename_all = "kebab-case")]
 pub enum Quote {
     Single,
@@ -18,7 +18,7 @@ pub struct Options {
     pub avoid_escape: Option<bool>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Hash)]
 pub struct Settings {
     pub inline_quotes: Quote,
     pub multiline_quotes: Quote,

src/pep8_naming/settings.rs

@@ -29,7 +29,7 @@ pub struct Options {
     pub staticmethod_decorators: Option<Vec<String>>,
 }
 
-#[derive(Debug)]
+#[derive(Debug, Hash)]
 pub struct Settings {
     pub ignore_names: Vec<String>,
     pub classmethod_decorators: Vec<String>,

src/settings/mod.rs

@@ -84,14 +84,19 @@ impl Settings {
 
 impl Hash for Settings {
     fn hash<H: Hasher>(&self, state: &mut H) {
-        self.line_length.hash(state);
+        // Add base properties in alphabetical order.
         self.dummy_variable_rgx.as_str().hash(state);
         for value in self.enabled.iter() {
             value.hash(state);
         }
+        self.line_length.hash(state);
         for value in self.per_file_ignores.iter() {
             value.hash(state);
         }
+        self.target_version.hash(state);
+        // Add plugin properties in alphabetical order.
+        self.flake8_quotes.hash(state);
+        self.pep8_naming.hash(state);
     }
 }
 

src/settings/types.rs

@@ -11,7 +11,7 @@ use crate::checks::CheckCode;
 use crate::checks_gen::CheckCodePrefix;
 use crate::fs;
 
-#[derive(Clone, Debug, PartialOrd, PartialEq, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialOrd, PartialEq, Eq, Serialize, Deserialize, Hash)]
 pub enum PythonVersion {
     Py33,
     Py34,