From 520bdb6c31dd08b6f4e52de5116fd23d6d57fdda Mon Sep 17 00:00:00 2001
From: Daniel Buckmaster <daniel@crabmusket.net>
Date: Thu, 8 Aug 2019 21:25:39 +1000
Subject: Fix repl crash when deno dir doesn't exist (#2727)

---
 cli/repl.rs | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'cli')

diff --git a/cli/repl.rs b/cli/repl.rs
index 7e72b9b10..0cac6c4ea 100644
--- a/cli/repl.rs
+++ b/cli/repl.rs
@@ -76,6 +76,14 @@ impl Repl {
   }
 
   fn save_history(&mut self) -> Result<(), ErrBox> {
+    if !self.history_dir_exists() {
+      eprintln!(
+        "Unable to save REPL history: {:?} directory does not exist",
+        self.history_file
+      );
+      return Ok(());
+    }
+
     self
       .editor
       .save_history(&self.history_file.to_str().unwrap())
@@ -86,6 +94,14 @@ impl Repl {
       })
   }
 
+  fn history_dir_exists(&self) -> bool {
+    self
+      .history_file
+      .parent()
+      .map(|ref p| p.exists())
+      .unwrap_or(false)
+  }
+
   pub fn readline(&mut self, prompt: &str) -> Result<String, ErrBox> {
     self
       .editor
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