implement section

src/section.rs

@@ -0,0 +1,38 @@
+use std::{collections::HashSet, hash::Hash};
+
+use crate::Package;
+
+#[derive(Debug, Eq)]
+pub struct Section {
+    pub name: String,
+    pub packages: HashSet<Package>,
+}
+
+impl Section {
+    pub(crate) fn new(name: String, packages: HashSet<Package>) -> Self {
+        Self { name, packages }
+    }
+
+    pub fn from_lines<'a>(iter: &mut impl Iterator<Item = &'a str>) -> Self {
+        let name = iter.find(|line| line.starts_with('[')).unwrap().to_string();
+        let packages = iter
+            .take_while(|line| !line.starts_with('['))
+            .filter(|line| !line.contains(char::is_alphabetic))
+            .map(Package::from)
+            .collect();
+
+        Self::new(name, packages)
+    }
+}
+
+impl Hash for Section {
+    fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
+        self.name.hash(state);
+    }
+}
+
+impl PartialEq for Section {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name
+    }
+}