history of visited directories

1 files changed, 73 insertions, 0 deletions

diff --git a/src/visited.rs b/src/visited.rs
new file mode 100644
index 0000000..c9b27bf
--- /dev/null
+++ b/src/visited.rs
@@ -0,0 +1,73 @@
+use std::path::PathBuf;
+
+#[derive(Clone, Debug)]
+pub struct History {
+    pub visited: Vec<PathBuf>,
+    pub index: usize,
+}
+
+impl Default for History {
+    fn default() -> Self {
+        Self {
+            visited: vec![],
+            index: 0,
+        }
+    }
+}
+
+impl History {
+    pub fn push(&mut self, path: &PathBuf) {
+        if !self.visited.contains(path) {
+            self.visited.push(path.to_owned());
+            self.index = self.len() - 1
+        }
+    }
+
+    pub fn pop(&mut self) -> Option<PathBuf> {
+        self.visited.pop()
+    }
+
+    pub fn is_empty(&self) -> bool {
+        self.visited.is_empty()
+    }
+
+    pub fn len(&self) -> usize {
+        self.visited.len()
+    }
+
+    pub fn next(&mut self) {
+        if self.is_empty() {
+            self.index = 0
+        } else if self.index > 0 {
+            self.index -= 1;
+        } else {
+            self.index = self.len() - 1
+        }
+    }
+
+    pub fn prev(&mut self) {
+        if self.is_empty() {
+            self.index = 0;
+        } else {
+            self.index = (self.index + 1) % self.len()
+        }
+    }
+
+    pub fn selected(&self) -> Option<PathBuf> {
+        if self.index < self.len() {
+            Some(self.visited[self.index].clone())
+        } else {
+            None
+        }
+    }
+
+    pub fn drop_queue(&mut self) {
+        let final_length = self.len() - self.index;
+        self.visited.truncate(final_length);
+        if self.is_empty() {
+            self.index = 0
+        } else {
+            self.index = self.len() - 1
+        }
+    }
+}