1 files changed, 39 insertions, 5 deletions

diff --git a/cli/flags.rs b/cli/flags.rs
index f42dd771c..2371445c3 100644
--- a/cli/flags.rs
+++ b/cli/flags.rs
@@ -91,7 +91,9 @@ pub enum DenoSubcommand {
     rules: bool,
     json: bool,
   },
-  Repl,
+  Repl {
+    eval: Option<String>,
+  },
   Run {
     script: String,
   },
@@ -119,7 +121,7 @@ pub enum DenoSubcommand {
 
 impl Default for DenoSubcommand {
   fn default() -> DenoSubcommand {
-    DenoSubcommand::Repl
+    DenoSubcommand::Repl { eval: None }
   }
 }
 
@@ -955,6 +957,13 @@ Ignore linting a file by adding an ignore comment at the top of the file:
 fn repl_subcommand<'a, 'b>() -> App<'a, 'b> {
   runtime_args(SubCommand::with_name("repl"), false, true)
     .about("Read Eval Print Loop")
+    .arg(
+      Arg::with_name("eval")
+        .long("eval")
+        .help("Evaluates the provided code when the REPL starts.")
+        .takes_value(true)
+        .value_name("code"),
+    )
 }
 
 fn run_subcommand<'a, 'b>() -> App<'a, 'b> {
@@ -1701,7 +1710,9 @@ fn lint_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
 fn repl_parse(flags: &mut Flags, matches: &clap::ArgMatches) {
   runtime_args_parse(flags, matches, false, true);
   flags.repl = true;
-  flags.subcommand = DenoSubcommand::Repl;
+  flags.subcommand = DenoSubcommand::Repl {
+    eval: matches.value_of("eval").map(ToOwned::to_owned),
+  };
   flags.allow_net = Some(vec![]);
   flags.allow_env = Some(vec![]);
   flags.allow_run = Some(vec![]);
@@ -2706,7 +2717,7 @@ mod tests {
       r.unwrap(),
       Flags {
         repl: true,
-        subcommand: DenoSubcommand::Repl,
+        subcommand: DenoSubcommand::Repl { eval: None },
         allow_net: Some(vec![]),
         allow_env: Some(vec![]),
         allow_run: Some(vec![]),
@@ -2727,7 +2738,7 @@ mod tests {
       r.unwrap(),
       Flags {
         repl: true,
-        subcommand: DenoSubcommand::Repl,
+        subcommand: DenoSubcommand::Repl { eval: None },
         import_map_path: Some("import_map.json".to_string()),
         no_remote: true,
         config_path: Some("tsconfig.json".to_string()),
@@ -2754,6 +2765,29 @@ mod tests {
   }
 
   #[test]
+  fn repl_with_eval_flag() {
+    #[rustfmt::skip]
+    let r = flags_from_vec(svec!["deno", "repl", "--eval", "console.log('hello');"]);
+    assert_eq!(
+      r.unwrap(),
+      Flags {
+        repl: true,
+        subcommand: DenoSubcommand::Repl {
+          eval: Some("console.log('hello');".to_string()),
+        },
+        allow_net: Some(vec![]),
+        allow_env: Some(vec![]),
+        allow_run: Some(vec![]),
+        allow_read: Some(vec![]),
+        allow_write: Some(vec![]),
+        allow_plugin: true,
+        allow_hrtime: true,
+        ..Flags::default()
+      }
+    );
+  }
+
+  #[test]
   fn allow_read_allowlist() {
     use tempfile::TempDir;
     let temp_dir = TempDir::new().expect("tempdir fail").path().to_path_buf();