Split in multiple binaries

src/nixos.rs

@@ -0,0 +1,40 @@
+use std::path::PathBuf;
+
+#[derive(Clone)]
+pub struct NixStorePath {
+    pub hash: String,
+    pub name: String,
+}
+
+impl NixStorePath {
+    pub fn from_str_symlink(path: &str) -> Result<Self, String> {
+        Ok(Self::from_path_buf_symlink(PathBuf::from(path))?)
+    }
+
+    pub fn from_path_buf_symlink(path: PathBuf) -> Result<Self, String> {
+        Ok(Self::from_path_buf(path.read_link().map_err(|err| err.to_string())?)?)
+    }
+
+    pub fn from_path_buf(path: PathBuf) -> Result<Self, String> {
+        let store_path_name = path.iter().nth(3)
+            .ok_or_else(|| String::from("Can't read store path name"))?
+            .to_str()
+            .ok_or_else(|| String::from("Failed converting store path name to string"))?
+            .to_string();
+        Ok(Self::from_store_path_name(store_path_name)?)
+    }
+
+    pub fn from_store_path_name(store_path_name: String) -> Result<Self, String> {
+        let (hash, name) = store_path_name
+            .split_once("-")
+            .ok_or_else(|| String::from("Failed splitting store path name for hash and name"))?;
+        Ok(Self {
+            hash: hash.to_string(),
+            name: name.to_string(),
+        })
+    }
+
+    pub fn to_prometheus_metric(self, infix: String) -> Result<String, String> {
+        return Ok(format!("nixos_{}_hash{{hash=\"{}\"}} 1\nnixos_{}_name{{name=\"{}\"}} 1\n", infix, self.hash, infix, self.name));
+    }
+}