refactor: change name from builder to installer

pkgr/src/tmpfs.rs

@@ -0,0 +1,48 @@
+use std::path::PathBuf;
+
+pub struct TempDir {
+    path: PathBuf,
+}
+
+impl TempDir {
+    pub fn new(path: PathBuf) -> TempDir {
+        if !path.exists() {
+            std::fs::create_dir_all(&path).unwrap();
+        }
+        TempDir {
+            path
+        }
+    }
+
+    pub fn push<S: Into<String>>(&mut self, path: S) {
+        self.path.push(path.into());
+    }
+}
+
+impl Default for TempDir {
+    fn default() -> TempDir {
+        TempDir::new({
+            let mut t = std::env::temp_dir();
+            t.push("pkgr");
+            t
+        })
+    }
+}
+
+impl Into<PathBuf> for TempDir {
+    fn into(self) -> PathBuf {
+        self.path
+    }
+}
+
+impl Into<String> for TempDir {
+    fn into(self) -> String {
+        self.path.to_str().unwrap().to_string()
+    }
+}
+
+impl ToString for TempDir {
+    fn to_string(&self) -> String {
+        self.path.to_str().unwrap().to_string()
+    }
+}