introduce a new settings update system

meilisearch-core/src/settings.rs

@@ -0,0 +1,85 @@
+use std::collections::{BTreeMap, BTreeSet};
+
+use serde::{Deserialize, Serialize};
+
+#[derive(Default, Clone, Serialize, Deserialize)]
+pub struct Settings {
+    pub ranking_rules: Option<Vec<String>>,
+    pub ranking_distinct: Option<String>,
+    pub attribute_identifier: Option<String>,
+    pub attributes_searchable: Option<Vec<String>>,
+    pub attributes_displayed: Option<Vec<String>>,
+    pub attributes_ranked: Option<Vec<String>>,
+    pub stop_words: Option<BTreeSet<String>>,
+    pub synonyms: Option<BTreeMap<String, Vec<String>>>,
+}
+
+impl Into<SettingsUpdate> for Settings {
+    fn into(self) -> SettingsUpdate {
+        let settings = self.clone();
+        SettingsUpdate {
+            ranking_rules: settings.ranking_rules.into(),
+            ranking_distinct: settings.ranking_distinct.into(),
+            attribute_identifier: settings.attribute_identifier.into(),
+            attributes_searchable: settings.attributes_searchable.into(),
+            attributes_displayed: settings.attributes_displayed.into(),
+            attributes_ranked: settings.attributes_ranked.into(),
+            stop_words: settings.stop_words.into(),
+            synonyms: settings.synonyms.into(),
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum UpdateState<T> {
+    Update(T),
+    Add(T),
+    Delete(T),
+    Clear,
+    Nothing,
+}
+
+impl <T> From<Option<T>> for UpdateState<T> {
+    fn from(opt: Option<T>) -> UpdateState<T> {
+        match opt {
+            Some(t) => UpdateState::Update(t),
+            None => UpdateState::Nothing,
+        }
+    }
+}
+
+impl<T> UpdateState<T> {
+    pub fn is_changed(&self) -> bool {
+        match self {
+            UpdateState::Nothing => false,
+            _ => true,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SettingsUpdate {
+    pub ranking_rules: UpdateState<Vec<String>>,
+    pub ranking_distinct: UpdateState<String>,
+    pub attribute_identifier: UpdateState<String>,
+    pub attributes_searchable: UpdateState<Vec<String>>,
+    pub attributes_displayed: UpdateState<Vec<String>>,
+    pub attributes_ranked: UpdateState<Vec<String>>,
+    pub stop_words: UpdateState<BTreeSet<String>>,
+    pub synonyms: UpdateState<BTreeMap<String, Vec<String>>>,
+}
+
+impl Default for SettingsUpdate {
+    fn default() -> Self {
+        Self {
+            ranking_rules: UpdateState::Nothing,
+            ranking_distinct: UpdateState::Nothing,
+            attribute_identifier: UpdateState::Nothing,
+            attributes_searchable: UpdateState::Nothing,
+            attributes_displayed: UpdateState::Nothing,
+            attributes_ranked: UpdateState::Nothing,
+            stop_words: UpdateState::Nothing,
+            synonyms: UpdateState::Nothing,
+        }
+    }
+}