feat(sysctl): support listing parameters by subsection (#44)

systeroid-core/src/sysctl/controller.rs

@@ -64,13 +64,14 @@ impl Sysctl {
 
     /// Returns the parameters that matches the given query.
     pub fn get_parameters(&self, query: &str) -> Vec<&Parameter> {
+        let query = query.replace('/', ".");
         let parameters = self
             .parameters
             .iter()
             .filter(|param| {
-                param.name == query.replace('/', ".")
-                    || param.section.to_string() == query
-                    || param.get_absolute_name() == Some(&query.replace('/', "."))
+                param.name == query
+                    || param.get_absolute_name() == Some(&query)
+                    || param.is_in_section(&query)
             })
             .collect::<Vec<&Parameter>>();
         if parameters.is_empty() && !self.config.cli.ignore_errors {

systeroid-core/src/sysctl/parameter.rs

@@ -196,6 +196,22 @@ impl Parameter {
         }
         Ok(())
     }
+
+    /// Performs a search for given query and returns true if
+    /// the parameter is in the given sub/section.
+    pub fn is_in_section(&self, query: &str) -> bool {
+        let mut subsection = self.section.to_string();
+        let mut components = self.name.split('.').skip(1).peekable();
+        while let Some(component) = components.next() {
+            if query == subsection {
+                return true;
+            }
+            if components.peek().is_some() {
+                subsection = format!("{}.{}", subsection, component)
+            }
+        }
+        false
+    }
 }
 
 #[cfg(test)]
@@ -288,6 +304,19 @@ mod tests {
             .update_value("0", &config, &mut Vec::new())
             .is_err());
 
+        parameter.name = String::from("kernel.fictional.testing.xyz.parameter");
+        assert!(parameter.is_in_section(&parameter.section.to_string()));
+        assert!(parameter.is_in_section("kernel"));
+        assert!(parameter.is_in_section("kernel.fictional"));
+        assert!(parameter.is_in_section("kernel.fictional.testing"));
+        assert!(parameter.is_in_section("kernel.fictional.testing.xyz"));
+        assert!(!parameter.is_in_section("xyz"));
+        assert!(!parameter.is_in_section("test"));
+        assert!(!parameter.is_in_section("ker"));
+        assert!(!parameter.is_in_section("kernel.fi"));
+        assert!(!parameter.is_in_section("kernel.fictional.tes"));
+        assert!(!parameter.is_in_section(&parameter.name));
+
         Ok(())
     }
 }