add fmt::Display for CGroupLimitValue

src/cgroup/cgroup.rs

@@ -1,4 +1,5 @@
 use std::{
+    fmt,
     fs::{self, File},
     io::{Read, Write},
     path::PathBuf,
@@ -148,7 +149,7 @@ impl CGroup {
 
     fn get_limit_value<T>(&self, name: &str) -> Result<CGroupLimitValue<T>, std::io::Error>
     where
-        T: FromStr,
+        T: FromStr + fmt::Display,
     {
         let value = self.read(name)?;
 

src/cgroup/limit_value.rs

@@ -1,9 +1,9 @@
-use std::str::FromStr;
+use std::{fmt, str::FromStr};
 
 #[derive(Debug)]
 pub enum CGroupLimitValue<T>
 where
-    T: FromStr,
+    T: FromStr + std::fmt::Display,
 {
     Max,
     Value(T),
@@ -14,7 +14,7 @@ pub struct ParseCGroupLimitValueError;
 
 impl<T> FromStr for CGroupLimitValue<T>
 where
-    T: FromStr,
+    T: FromStr + std::fmt::Display,
 {
     type Err = ParseCGroupLimitValueError;
 
@@ -30,3 +30,15 @@ where
         }
     }
 }
+
+impl<T> fmt::Display for CGroupLimitValue<T>
+where
+    T: FromStr + fmt::Display,
+{
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            CGroupLimitValue::Max => write!(f, "max"),
+            CGroupLimitValue::Value(value) => write!(f, "{value}"),
+        }
+    }
+}