Quit if Command Extensions are disabled

README.md

@@ -186,11 +186,8 @@ zoxide can be installed in 4 easy steps:
    > Add this to the **end** of your config file or AutoRun command:
    >
    > ```batchfile
-   > zoxide init cmd | cmd /d >nul
+   > zoxide init cmd | cmd /d /k >nul
    > ```
-   >
-   > **Note**
-   > zoxide only supports `cmd.exe` with Command Extensions v2 and above.
 
    </details>
 

src/shell.rs

@@ -104,13 +104,27 @@ mod tests {
         let source = Cmd(&opts).render().unwrap();
 
         Command::new("cmd.exe")
-            .args(["/a", "/d", "/e:on", "/q", "/v:off", "/k", "@doskey", "/macros:all"])
+            .args(["/a", "/d", "/e:on", "/q", "/v:off", "/k", "@doskey /macros:cmd.exe"])
             .write_stdin(source)
             .assert()
             .success()
             .stderr("");
     }
 
+    #[apply(opts)]
+    #[cfg(windows)]
+    fn cmd_dos(cmd: Option<&str>, hook: InitHook, echo: bool, resolve_symlinks: bool) {
+        let opts = Opts { cmd, hook, echo, resolve_symlinks };
+        let source = Cmd(&opts).render().unwrap();
+
+        Command::new("cmd.exe")
+            .args(["/a", "/d", "/e:off", "/q", "/v:off", "/k", "@doskey /macros:cmd.exe"])
+            .write_stdin(source)
+            .assert()
+            .failure()
+            .stderr("zoxide: unable to init with Command Extensions disabled (see `help cmd` for details)");
+    }
+
     #[apply(opts)]
     #[cfg(unix)]
     fn elvish_elvish(cmd: Option<&str>, hook: InitHook, echo: bool, resolve_symlinks: bool) {

templates/cmd.txt

@@ -32,7 +32,11 @@
 {%- let section = "@rem ==========================================================================\n@rem" -%}
 {%- let not_configured = "@rem -- not configured --" -%}
 
-@echo off & setlocal DisableDelayedExpansion EnableExtensions
+@(set ^"^") >nul 2>nul && (echo off) || (
+    echo zoxide: unable to init with Command Extensions disabled ^(see `help cmd` for details^)
+) >&2 && exit /b 1 "Command Extensions are disabled" 2>nul
+
+setlocal DisableDelayedExpansion EnableExtensions
 
 if /i "%~f0"=="%~dpnx0" (
     set ^"$p=%%<nul"
@@ -156,6 +160,4 @@ endlocal & set OLDPWD=
 {{ section }}
 @rem To initialize zoxide, add this to your configuration or AutoRun command:
 @rem
-@rem   zoxide init cmd | cmd /d >nul
-@rem
-@rem Note: zoxide only supports `cmd.exe` with Command Extensions v2 and above.
+@rem   zoxide init cmd | cmd /d /k >nul