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/config.rs

@@ -18,6 +18,7 @@ use tracing::debug;
 use which_crate::which;
 
 use crate::command::CommandExt;
+use crate::sudo::SudoKind;
 
 use super::utils::{editor, hostname};
 
@@ -293,6 +294,7 @@ pub struct Vim {
 #[serde(deny_unknown_fields)]
 /// Configuration file
 pub struct ConfigFile {
+    sudo_command: Option<SudoKind>,
     pre_sudo: Option<bool>,
     pre_commands: Option<Commands>,
     post_commands: Option<Commands>,
@@ -1017,6 +1019,10 @@ impl Config {
             .unwrap_or(false)
     }
 
+    pub fn sudo_command(&self) -> Option<SudoKind> {
+        self.config_file.sudo_command
+    }
+
     /// If `true`, `sudo` should be called after `pre_commands` in order to elevate at the
     /// start of the session (and not in the middle).
     pub fn pre_sudo(&self) -> bool {