Add sudo_command option (#379)

This allows the user to specify the preferred sudo command to be used
instead of the command chosen by Sudo::detect

src/sudo.rs

@@ -4,6 +4,8 @@ use std::path::PathBuf;
 
 use color_eyre::eyre::Context;
 use color_eyre::eyre::Result;
+use serde::Deserialize;
+use strum::AsRefStr;
 
 use crate::command::CommandExt;
 use crate::execution_context::ExecutionContext;
@@ -31,6 +33,11 @@ impl Sudo {
             .map(|(path, kind)| Self { path, kind })
     }
 
+    /// Create Sudo from SudoKind, if found in the system
+    pub fn new(kind: SudoKind) -> Option<Self> {
+        which(kind.as_ref()).map(|path| Self { path, kind })
+    }
+
     /// Elevate permissions with `sudo`.
     ///
     /// This helps prevent blocking `sudo` prompts from stopping the run in the middle of a
@@ -100,8 +107,10 @@ impl Sudo {
     }
 }
 
-#[derive(Clone, Copy, Debug)]
-enum SudoKind {
+#[derive(Clone, Copy, Debug, Deserialize, AsRefStr)]
+#[serde(rename_all = "lowercase")]
+#[strum(serialize_all = "lowercase")]
+pub enum SudoKind {
     Doas,
     Please,
     Sudo,