feat(repl): add `DENO_REPL_HISTORY` to change history file path (#18047)

cli/args/flags.rs

@@ -593,6 +593,9 @@ static ENV_VARIABLES_HELP: &str = r#"ENVIRONMENT VARIABLES:
     DENO_DIR             Set the cache directory
     DENO_INSTALL_ROOT    Set deno install's output directory
                          (defaults to $HOME/.deno/bin)
+    DENO_REPL_HISTORY    Set REPL history file path
+                         History file is disabled when the value is empty
+                         (defaults to $DENO_DIR/deno_history.txt)
     DENO_NO_PACKAGE_JSON Disables auto-resolution of package.json
     DENO_NO_PROMPT       Set to disable permission prompts on access
                          (alternative to passing --no-prompt on invocation)

cli/cache/deno_dir.rs

@@ -2,6 +2,7 @@
 
 use super::DiskCache;
 
+use std::env;
 use std::path::PathBuf;
 
 /// `DenoDir` serves as coordinator for multiple `DiskCache`s containing them
@@ -109,8 +110,17 @@ impl DenoDir {
   }
 
   /// Path used for the REPL history file.
-  pub fn repl_history_file_path(&self) -> PathBuf {
-    self.root.join("deno_history.txt")
+  /// Can be overridden or disabled by setting `DENO_REPL_HISTORY` environment variable.
+  pub fn repl_history_file_path(&self) -> Option<PathBuf> {
+    if let Some(deno_repl_history) = env::var_os("DENO_REPL_HISTORY") {
+      if deno_repl_history.is_empty() {
+        None
+      } else {
+        Some(PathBuf::from(deno_repl_history))
+      }
+    } else {
+      Some(self.root.join("deno_history.txt"))
+    }
   }
 
   /// Folder path used for downloading new versions of deno.

cli/tests/integration/repl_tests.rs

@@ -654,6 +654,52 @@ fn missing_deno_dir() {
   assert!(err.is_empty());
 }
 
+#[test]
+fn custom_history_path() {
+  use std::fs::read;
+  let temp_dir = TempDir::new();
+  let history_path = temp_dir.path().join("history.txt");
+  let (out, err) = util::run_and_collect_output(
+    true,
+    "repl",
+    Some(vec!["1"]),
+    Some(vec![
+      (
+        "DENO_REPL_HISTORY".to_owned(),
+        history_path.to_str().unwrap().to_owned(),
+      ),
+      ("NO_COLOR".to_owned(), "1".to_owned()),
+    ]),
+    false,
+  );
+  assert!(read(&history_path).is_ok());
+  assert_ends_with!(out, "1\n");
+  assert!(err.is_empty());
+}
+
+#[test]
+fn disable_history_file() {
+  let deno_dir = util::new_deno_dir();
+  let default_history_path = deno_dir.path().join("deno_history.txt");
+  let (out, err) = util::run_and_collect_output(
+    true,
+    "repl",
+    Some(vec!["1"]),
+    Some(vec![
+      (
+        "DENO_DIR".to_owned(),
+        deno_dir.path().to_str().unwrap().to_owned(),
+      ),
+      ("DENO_REPL_HISTORY".to_owned(), "".to_owned()),
+      ("NO_COLOR".to_owned(), "1".to_owned()),
+    ]),
+    false,
+  );
+  assert!(!default_history_path.try_exists().unwrap());
+  assert_ends_with!(out, "1\n");
+  assert!(err.is_empty());
+}
+
 #[test]
 fn save_last_eval() {
   let (out, err) = util::run_and_collect_output(

cli/tools/repl/editor.rs

@@ -401,7 +401,7 @@ impl Highlighter for EditorHelper {
 #[derive(Clone)]
 pub struct ReplEditor {
   inner: Arc<Mutex<Editor<EditorHelper>>>,
-  history_file_path: PathBuf,
+  history_file_path: Option<PathBuf>,
   errored_on_history_save: Arc<AtomicBool>,
   should_exit_on_interrupt: Arc<AtomicBool>,
 }
@@ -409,7 +409,7 @@ pub struct ReplEditor {
 impl ReplEditor {
   pub fn new(
     helper: EditorHelper,
-    history_file_path: PathBuf,
+    history_file_path: Option<PathBuf>,
   ) -> Result<Self, AnyError> {
     let editor_config = Config::builder()
       .completion_type(CompletionType::List)
@@ -418,7 +418,9 @@ impl ReplEditor {
     let mut editor =
       Editor::with_config(editor_config).expect("Failed to create editor.");
     editor.set_helper(Some(helper));
-    editor.load_history(&history_file_path).unwrap_or(());
+    if let Some(history_file_path) = &history_file_path {
+      editor.load_history(history_file_path).unwrap_or(());
+    }
     editor.bind_sequence(
       KeyEvent(KeyCode::Char('s'), Modifiers::CTRL),
       EventHandler::Simple(Cmd::Newline),
@@ -435,13 +437,15 @@ impl ReplEditor {
       })),
     );
 
-    let history_file_dir = history_file_path.parent().unwrap();
-    std::fs::create_dir_all(history_file_dir).with_context(|| {
-      format!(
-        "Unable to create directory for the history file: {}",
-        history_file_dir.display()
-      )
-    })?;
+    if let Some(history_file_path) = &history_file_path {
+      let history_file_dir = history_file_path.parent().unwrap();
+      std::fs::create_dir_all(history_file_dir).with_context(|| {
+        format!(
+          "Unable to create directory for the history file: {}",
+          history_file_dir.display()
+        )
+      })?;
+    }
 
     Ok(ReplEditor {
       inner: Arc::new(Mutex::new(editor)),
@@ -457,13 +461,15 @@ impl ReplEditor {
 
   pub fn update_history(&self, entry: String) {
     self.inner.lock().add_history_entry(entry);
-    if let Err(e) = self.inner.lock().append_history(&self.history_file_path) {
-      if self.errored_on_history_save.load(Relaxed) {
-        return;
-      }
+    if let Some(history_file_path) = &self.history_file_path {
+      if let Err(e) = self.inner.lock().append_history(history_file_path) {
+        if self.errored_on_history_save.load(Relaxed) {
+          return;
+        }
 
-      self.errored_on_history_save.store(true, Relaxed);
-      eprintln!("Unable to save history file: {e}");
+        self.errored_on_history_save.store(true, Relaxed);
+        eprintln!("Unable to save history file: {e}");
+      }
     }
   }