install: add --force flag and remove yes/no prompt (#3917)

cli/installer.rs

@@ -4,7 +4,6 @@ use regex::{Regex, RegexBuilder};
 use std::env;
 use std::fs;
 use std::fs::File;
-use std::io;
 use std::io::Error;
 use std::io::ErrorKind;
 use std::io::Write;
@@ -23,15 +22,6 @@ lazy_static! {
     ).case_insensitive(true).build().unwrap();
 }
 
-fn yes_no_prompt(msg: &str) -> bool {
-  println!("{} [yN]", msg);
-  let mut buffer = String::new();
-  io::stdin()
-    .read_line(&mut buffer)
-    .expect("Couldn't read from stdin");
-  buffer.starts_with('y') | buffer.starts_with('Y')
-}
-
 fn is_remote_url(module_url: &str) -> bool {
   module_url.starts_with("http://") || module_url.starts_with("https://")
 }
@@ -60,7 +50,6 @@ fn generate_executable_file(
     "% generated by deno install %\ndeno.exe {} %*\n",
     args.join(" ")
   );
-  let file_path = file_path.with_extension(".cmd");
   let mut file = File::create(&file_path)?;
   file.write_all(template.as_bytes())?;
   Ok(())
@@ -71,9 +60,6 @@ fn generate_executable_file(
   file_path: PathBuf,
   args: Vec<String>,
 ) -> Result<(), Error> {
-  // On Windows if user is using Powershell .cmd extension is need to run the
-  // installed module.
-  // Generate batch script to satisfy that.
   let args: Vec<String> = args.iter().map(|c| format!("\"{}\"", c)).collect();
   let template = format!(
     r#"#!/bin/sh
@@ -119,6 +105,7 @@ pub fn install(
   exec_name: &str,
   module_url: &str,
   args: Vec<String>,
+  force: bool,
 ) -> Result<(), Error> {
   let installation_dir = if let Some(dir) = installation_dir {
     PathBuf::from(dir).canonicalize()?
@@ -131,7 +118,7 @@ pub fn install(
     if !metadata.is_dir() {
       return Err(Error::new(
         ErrorKind::Other,
-        "Insallation path is not a directory",
+        "Installation path is not a directory",
       ));
     }
   } else {
@@ -153,16 +140,17 @@ pub fn install(
   };
 
   validate_exec_name(exec_name)?;
-  let file_path = installation_dir.join(exec_name);
+  let mut file_path = installation_dir.join(exec_name);
 
-  if file_path.exists() {
-    let msg = format!(
-      "⚠️  {} is already installed, do you want to overwrite it?",
-      exec_name
-    );
-    if !yes_no_prompt(&msg) {
-      return Ok(());
-    };
+  if cfg!(windows) {
+    file_path = file_path.with_extension(".cmd");
+  }
+
+  if file_path.exists() && !force {
+    return Err(Error::new(
+      ErrorKind::Other,
+      "Existing installation found. Aborting (Use -f to overwrite)",
+    ));
   };
 
   let mut executable_args = vec!["run".to_string()];
@@ -227,6 +215,7 @@ mod tests {
       "echo_test",
       "http://localhost:4545/cli/tests/echo_server.ts",
       vec![],
+      false,
     )
     .expect("Install failed");
 
@@ -260,6 +249,7 @@ mod tests {
       "echo_test",
       "http://localhost:4545/cli/tests/echo_server.ts",
       vec![],
+      false,
     )
     .expect("Install failed");
 
@@ -288,6 +278,7 @@ mod tests {
       "echo_test",
       "http://localhost:4545/cli/tests/echo_server.ts",
       vec!["--foobar".to_string()],
+      false,
     )
     .expect("Install failed");
 
@@ -314,6 +305,7 @@ mod tests {
       "echo_test",
       &local_module_str,
       vec![],
+      false,
     )
     .expect("Install failed");
 
@@ -326,4 +318,69 @@ mod tests {
     let content = fs::read_to_string(file_path).unwrap();
     assert!(content.contains(&local_module_url.to_string()));
   }
+
+  #[test]
+  fn install_force() {
+    let temp_dir = TempDir::new().expect("tempdir fail");
+    let temp_dir_str = temp_dir.path().to_string_lossy().to_string();
+    let original_home = env::var_os("HOME");
+    let original_user_profile = env::var_os("HOME");
+    env::set_var("HOME", &temp_dir_str);
+    env::set_var("USERPROFILE", &temp_dir_str);
+
+    install(
+      DenoFlags::default(),
+      None,
+      "echo_test",
+      "http://localhost:4545/cli/tests/echo_server.ts",
+      vec![],
+      false,
+    )
+    .expect("Install failed");
+
+    let mut file_path = temp_dir.path().join(".deno/bin/echo_test");
+    if cfg!(windows) {
+      file_path = file_path.with_extension(".cmd");
+    }
+    assert!(file_path.exists());
+
+    // No force. Install failed.
+    let no_force_result = install(
+      DenoFlags::default(),
+      None,
+      "echo_test",
+      "http://localhost:4545/cli/tests/cat.ts", // using a different URL
+      vec![],
+      false,
+    );
+    assert!(no_force_result.is_err());
+    assert!(no_force_result
+      .unwrap_err()
+      .to_string()
+      .contains("Existing installation found"));
+    // Assert not modified
+    let file_content = fs::read_to_string(&file_path).unwrap();
+    assert!(file_content.contains("echo_server.ts"));
+
+    // Force. Install success.
+    let force_result = install(
+      DenoFlags::default(),
+      None,
+      "echo_test",
+      "http://localhost:4545/cli/tests/cat.ts", // using a different URL
+      vec![],
+      true,
+    );
+    assert!(force_result.is_ok());
+    // Assert modified
+    let file_content_2 = fs::read_to_string(&file_path).unwrap();
+    assert!(file_content_2.contains("cat.ts"));
+
+    if let Some(home) = original_home {
+      env::set_var("HOME", home);
+    }
+    if let Some(user_profile) = original_user_profile {
+      env::set_var("USERPROFILE", user_profile);
+    }
+  }
 }