cli: fix windows yarn error (#1965)

* fix windows yarn error

* add install_node_modules function

cli/src/lib.rs

@@ -589,21 +589,10 @@ fn init(
         mocha.write_all(template::ts_mocha(&project_name).as_bytes())?;
     }
 
-    // Install node modules.
-    let yarn_result = std::process::Command::new("yarn")
-        .stdout(Stdio::inherit())
-        .stderr(Stdio::inherit())
-        .output()
-        .map_err(|e| anyhow::format_err!("yarn install failed: {}", e.to_string()))?;
+    let yarn_result = install_node_modules("yarn")?;
     if !yarn_result.status.success() {
         println!("Failed yarn install will attempt to npm install");
-        std::process::Command::new("npm")
-            .arg("install")
-            .stdout(Stdio::inherit())
-            .stderr(Stdio::inherit())
-            .output()
-            .map_err(|e| anyhow::format_err!("npm install failed: {}", e.to_string()))?;
-        println!("Failed to install node dependencies")
+        install_node_modules("npm")?;
     }
 
     if !no_git {
@@ -623,6 +612,24 @@ fn init(
     Ok(())
 }
 
+fn install_node_modules(cmd: &str) -> Result<std::process::Output> {
+    if cfg!(target_os = "windows") {
+        std::process::Command::new("cmd")
+            .arg(format!("/C {} install", cmd))
+            .stdout(Stdio::inherit())
+            .stderr(Stdio::inherit())
+            .output()
+            .map_err(|e| anyhow::format_err!("{} install failed: {}", cmd, e.to_string()))
+    } else {
+        std::process::Command::new(cmd)
+            .arg("install")
+            .stdout(Stdio::inherit())
+            .stderr(Stdio::inherit())
+            .output()
+            .map_err(|e| anyhow::format_err!("{} install failed: {}", cmd, e.to_string()))
+    }
+}
+
 // Creates a new program crate in the `programs/<name>` directory.
 fn new(cfg_override: &ConfigOverride, name: String) -> Result<()> {
     with_workspace(cfg_override, |cfg| {