Implement the shared automation CLI.

crates/bds-core/src/util/app_paths.rs

@@ -0,0 +1,34 @@
+use std::path::PathBuf;
+
+/// Machine-local application data directory shared by every RuDS surface.
+pub fn application_data_dir() -> PathBuf {
+    dirs::data_dir()
+        .unwrap_or_else(|| PathBuf::from("."))
+        .join("bds")
+}
+
+/// SQLite cache/registry used by desktop, CLI, TUI, and remote surfaces.
+pub fn application_database_path() -> PathBuf {
+    application_data_dir().join("bds.db")
+}
+
+/// Default portable project folder used on first launch.
+pub fn default_project_data_dir() -> PathBuf {
+    dirs::home_dir()
+        .unwrap_or_else(|| PathBuf::from("."))
+        .join("bds")
+        .join("my-blog")
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn database_is_inside_application_data_directory() {
+        assert_eq!(
+            application_database_path(),
+            application_data_dir().join("bds.db")
+        );
+    }
+}

crates/bds-core/src/util/mod.rs

@@ -1,3 +1,4 @@
+pub mod app_paths;
 pub mod atomic_write;
 mod checksum;
 pub mod frontmatter;
@@ -7,6 +8,7 @@ mod slug;
 pub mod thumbnail;
 pub mod timestamp;
 
+pub use app_paths::{application_data_dir, application_database_path, default_project_data_dir};
 pub use atomic_write::{atomic_write, atomic_write_str};
 pub use checksum::{content_hash, file_hash};
 pub use paths::*;