Add the ability to preview without opening the browser

src/commands/preview/mod.rs

@@ -34,6 +34,7 @@ pub fn preview(
     body: Option<String>,
     livereload: bool,
     verbose: bool,
+    headless: bool,
 ) -> Result<(), failure::Error> {
     commands::build(&target)?;
 
@@ -53,10 +54,12 @@ pub fn preview(
 
         info!("Opened websocket server on port {}", ws_port);
 
-        open_browser(&format!(
+        if !headless {
+            open_browser(&format!(
             "https://cloudflareworkers.com/?wrangler_session_id={0}&wrangler_ws_port={1}&hide_editor#{2}:{3}{4}",
             &session.to_string(), ws_port, script_id, https_str, preview_host,
         ))?;
+        }
 
         //don't do initial GET + POST with livereload as the expected behavior is unclear.
 
@@ -70,10 +73,12 @@ pub fn preview(
             verbose,
         )?;
     } else {
-        open_browser(&format!(
-            "https://cloudflareworkers.com/?hide_editor#{0}:{1}{2}",
-            script_id, https_str, preview_host
-        ))?;
+        if !headless {
+            open_browser(&format!(
+                "https://cloudflareworkers.com/?hide_editor#{0}:{1}{2}",
+                script_id, https_str, preview_host
+            ))?;
+        }
 
         let cookie = format!(
             "__ew_fiddle_preview={}{}{}{}",

src/main.rs

@@ -309,6 +309,12 @@ fn run() -> Result<(), failure::Error> {
                     "{} Preview your code temporarily on cloudflareworkers.com",
                     emoji::MICROSCOPE
                 ))
+                .arg(
+                    Arg::with_name("headless")
+                        .help("Don't open the browser on preview")
+                        .long("headless")
+                        .takes_value(false)
+                )
                 .arg(
                     Arg::with_name("method")
                         .help("Type of request to preview your worker with (get, post)")
@@ -506,8 +512,9 @@ fn run() -> Result<(), failure::Error> {
 
         let watch = matches.is_present("watch");
         let verbose = matches.is_present("verbose");
+        let headless = matches.is_present("headless");
 
-        commands::preview(target, user, method, body, watch, verbose)?;
+        commands::preview(target, user, method, body, watch, verbose, headless)?;
     } else if matches.subcommand_matches("whoami").is_some() {
         log::info!("Getting User settings");
         let user = settings::global_user::GlobalUser::new()?;

tests/preview.rs

@@ -72,5 +72,5 @@ fn preview(fixture: &str) {
 
     let mut preview = Command::cargo_bin(env!("CARGO_PKG_NAME")).unwrap();
     preview.current_dir(utils::fixture_path(fixture));
-    preview.arg("preview").assert().success();
+    preview.arg("preview").arg("--headless").assert().success();
 }