Use native Windows credential cache default

src/config.rs

@@ -208,7 +208,7 @@ impl Default for ClientConfig {
             predict: true,
             predict_mode: default_predict_mode(),
             cache_attach_tickets: true,
-            credential_cache: "~/.local/share/dosh/credentials".to_string(),
+            credential_cache: default_credential_cache(),
             auth_preference: default_auth_preference(),
             trust_on_first_use: false,
             native_auth_timeout_ms: default_native_auth_timeout_ms(),
@@ -264,6 +264,20 @@ fn default_auth_preference() -> String {
     "native,ssh".to_string()
 }
 
+fn default_credential_cache() -> String {
+    #[cfg(windows)]
+    {
+        if let Some(local_app_data) = std::env::var_os("LOCALAPPDATA") {
+            return PathBuf::from(local_app_data)
+                .join("dosh")
+                .join("credentials")
+                .to_string_lossy()
+                .into_owned();
+        }
+    }
+    "~/.local/share/dosh/credentials".to_string()
+}
+
 fn default_native_auth_timeout_ms() -> u64 {
     700
 }
@@ -343,7 +357,7 @@ pub fn expand_tilde(path: &str) -> PathBuf {
 
 #[cfg(test)]
 mod tests {
-    use super::{ClientConfig, ServerConfig, expand_tilde};
+    use super::{ClientConfig, ServerConfig, default_credential_cache, expand_tilde};
     use std::path::PathBuf;
 
     #[test]
@@ -359,6 +373,7 @@ dosh_port = 50000
         assert!(config.predict);
         assert_eq!(config.predict_mode, "experimental");
         assert_eq!(config.auth_preference, "native,ssh");
+        assert_eq!(config.credential_cache, default_credential_cache());
         assert_eq!(config.native_auth_timeout_ms, 700);
         assert_eq!(config.known_hosts, "~/.config/dosh/known_hosts");
         assert_eq!(config.identity_files, vec!["~/.ssh/id_ed25519"]);
@@ -383,6 +398,22 @@ dosh_port = 50000
         );
     }
 
+    #[test]
+    fn default_credential_cache_matches_platform() {
+        let cache = default_credential_cache();
+        #[cfg(windows)]
+        if let Some(local_app_data) = std::env::var_os("LOCALAPPDATA") {
+            assert_eq!(
+                PathBuf::from(cache),
+                PathBuf::from(local_app_data)
+                    .join("dosh")
+                    .join("credentials")
+            );
+            return;
+        }
+        assert_eq!(cache, "~/.local/share/dosh/credentials");
+    }
+
     #[test]
     fn old_server_configs_fill_new_fields_from_defaults() {
         let raw = r#"