fix: avoid Windows npm cmd shim launches

src-tauri/src/cli_agent_runtime/windows_cmd_shim.rs

@@ -0,0 +1,115 @@
+use super::AgentCommandTarget;
+use std::path::{Path, PathBuf};
+
+pub(super) fn command_target(binary: &Path) -> Result<Option<AgentCommandTarget>, String> {
+    if !is_batch_shim(binary) {
+        return Ok(None);
+    }
+
+    let Some(target) = target_path(binary) else {
+        return Ok(None);
+    };
+
+    if is_node_script(&target) {
+        return Ok(Some(AgentCommandTarget {
+            program: crate::mcp::find_node()?,
+            first_arg: Some(target),
+        }));
+    }
+
+    Ok(Some(AgentCommandTarget {
+        program: target,
+        first_arg: None,
+    }))
+}
+
+fn is_batch_shim(binary: &Path) -> bool {
+    has_extension(binary, &["cmd", "bat"])
+}
+
+fn target_path(binary: &Path) -> Option<PathBuf> {
+    let contents = std::fs::read_to_string(binary).ok()?;
+    contents
+        .split('"')
+        .skip(1)
+        .step_by(2)
+        .find_map(|token| resolve_target_path(binary, token))
+}
+
+fn resolve_target_path(binary: &Path, token: &str) -> Option<PathBuf> {
+    let relative = token
+        .strip_prefix("%dp0%")
+        .or_else(|| token.strip_prefix("%~dp0"))?
+        .trim_start_matches(['\\', '/']);
+    let mut target = binary.parent()?.to_path_buf();
+    for part in relative.split(['\\', '/']).filter(|part| !part.is_empty()) {
+        target.push(part);
+    }
+    is_supported_target(&target)
+        .then_some(target)
+        .filter(|target| target.is_file())
+}
+
+fn is_supported_target(path: &Path) -> bool {
+    is_node_script(path) || is_native_executable(path)
+}
+
+fn is_node_script(path: &Path) -> bool {
+    has_extension(path, &["js", "mjs", "cjs"])
+}
+
+fn is_native_executable(path: &Path) -> bool {
+    has_extension(path, &["exe", "com"]) && !has_file_name(path, "node.exe")
+}
+
+fn has_extension(path: &Path, expected_extensions: &[&str]) -> bool {
+    path.extension()
+        .and_then(|extension| extension.to_str())
+        .is_some_and(|extension| {
+            expected_extensions
+                .iter()
+                .any(|expected| extension.eq_ignore_ascii_case(expected))
+        })
+}
+
+fn has_file_name(path: &Path, expected_name: &str) -> bool {
+    path.file_name()
+        .and_then(|name| name.to_str())
+        .is_some_and(|name| name.eq_ignore_ascii_case(expected_name))
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn command_target_uses_native_exe_from_windows_cmd_shim() {
+        let dir = tempfile::tempdir().unwrap();
+        let shim = dir.path().join("claude.cmd");
+        let native_exe = dir
+            .path()
+            .join("node_modules")
+            .join("@anthropic-ai")
+            .join("claude-code")
+            .join("bin")
+            .join("claude.exe");
+        std::fs::create_dir_all(native_exe.parent().unwrap()).unwrap();
+        std::fs::write(dir.path().join("node.exe"), "node runtime").unwrap();
+        std::fs::write(&native_exe, "native claude launcher").unwrap();
+        std::fs::write(
+            &shim,
+            r#"@ECHO off
+IF EXIST "%~dp0\node.exe" (
+  SET "_prog=%~dp0\node.exe"
+)
+"%~dp0\node_modules\@anthropic-ai\claude-code\bin\claude.exe" %*
+"#,
+        )
+        .unwrap();
+
+        let target = command_target(&shim).unwrap().unwrap();
+
+        assert_eq!(target.program, native_exe);
+        assert_eq!(target.first_arg, None);
+    }
+}