From 6a5893a26927e3c0329a510f870d2277387aaf30 Mon Sep 17 00:00:00 2001
From: Yoshiya Hinosawa <stibium121@gmail.com>
Date: Thu, 16 May 2019 23:11:35 +0900
Subject: fmt: use --write option of prettier/main.ts (#2363)

This is step 1 of the plan outlined here:
https://github.com/denoland/deno/issues/2090#issuecomment-492897028
---
 cli/flags.rs | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/cli/flags.rs b/cli/flags.rs
index fa632513a..171c05ad0 100644
--- a/cli/flags.rs
+++ b/cli/flags.rs
@@ -448,6 +448,9 @@ pub fn flags_from_vec(
         .collect();
       argv.extend(files);
 
+      // `deno fmt` writes to the files by default
+      argv.push("--write".to_string());
+
       DenoSubcommand::Run
     }
     ("info", Some(info_match)) => {
@@ -726,7 +729,13 @@ mod tests {
     assert_eq!(subcommand, DenoSubcommand::Run);
     assert_eq!(
       argv,
-      svec!["deno", PRETTIER_URL, "script_1.ts", "script_2.ts"]
+      svec![
+        "deno",
+        PRETTIER_URL,
+        "script_1.ts",
+        "script_2.ts",
+        "--write"
+      ]
     );
   }
 
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