Port history::start_private_mode to Rust

fish-rust/src/history.rs

@@ -0,0 +1,8 @@
+use crate::env::{EnvMode, EnvStack};
+use crate::wchar::prelude::*;
+
+/// Sets private mode on. Once in private mode, it cannot be turned off.
+pub fn start_private_mode(vars: &EnvStack) {
+    vars.set_one(L!("fish_history"), EnvMode::GLOBAL, "".into());
+    vars.set_one(L!("fish_private_mode"), EnvMode::GLOBAL, "1".into());
+}

fish-rust/src/lib.rs

@@ -41,6 +41,7 @@
 mod future_feature_flags;
 mod global_safety;
 mod highlight;
+mod history;
 mod io;
 mod job_group;
 mod kill;