fix(windows): fix windows terminal ANSI escape sequences (#2258)

* fix(windows): don't inherit stdin when executing commands

On Windows, inheriting stdin from starship might lead to leaking the
console reference to the command we're executing. `id.exe` supplied with
Git has been observed to disable the ENABLE_VIRTUAL_TERMINAL_PROCESSING
console flag if it inherits stdin -- leading to Windows Terminal not
processing ANSI escape sequences.

This change fixes #2254 by explicitly disabling stdin inheritance.

The fix was suggested by David Knaack.

* fix(username): don't call `id -u` on Windows

This was done to check if user is root by comparing the UID to 0. Windows
does not have a concept of UID 0 anyway, so it's pointless to call `id.exe`
(which is installed with MSYS2 or Git, for example).

src/modules/username.rs

@@ -21,10 +21,14 @@ pub fn module<'a>(context: &'a Context) -> Option<Module<'a>> {
     let username = context.get_env(USERNAME_ENV_VAR)?;
     let logname = context.get_env("LOGNAME");
 
-    let user_uid = get_uid();
+    let is_root = if cfg!(not(target_os = "windows")) {
+        let user_uid = get_uid();
+        user_uid == ROOT_UID
+    } else {
+        false
+    };
 
     let is_not_login = logname.is_some() && username != logname.unwrap();
-    let is_root = user_uid == ROOT_UID;
 
     let mut module = context.new_module("username");
     let config: UsernameConfig = UsernameConfig::try_load(module.config);

src/utils.rs

@@ -277,6 +277,7 @@ fn internal_exec_cmd(cmd: &str, args: &[&str]) -> Option<CommandOutput> {
         .args(args)
         .stderr(Stdio::piped())
         .stdout(Stdio::piped())
+        .stdin(Stdio::null())
         .spawn()
     {
         Ok(process) => process,