Ely Office: six offline-first desktop apps in Rust and GPUI

ElyDoc, ElyTable, ElyShow (LibreOfficeKit), ElyPDF (MuPDF), ElyTree (Git),
ElyMark (Milkdown and CodeMirror in CEF). ElyMail and ElyAgent follow.

crates/ely-platform/src/dirs.rs

@@ -0,0 +1,62 @@
+use std::path::{Path, PathBuf};
+
+use anyhow::{Context, Result};
+use directories::BaseDirs;
+
+use crate::AppId;
+
+/// Everything an app stores lives here; uninstall removes only this.
+pub fn data_dir(app: AppId) -> Result<PathBuf> {
+    Ok(root()?.join(app.slug()))
+}
+
+/// The suite's folder: each app's, and the shared settings.
+pub(crate) fn root() -> Result<PathBuf> {
+    let base = BaseDirs::new().context("no home directory")?;
+    Ok(base.data_local_dir().join("ElyOffice"))
+}
+
+/// Omarchy's active theme directory; `ELY_OMARCHY_DIR` overrides it.
+pub fn omarchy_current_dir() -> Option<PathBuf> {
+    let home = BaseDirs::new()?.home_dir().to_path_buf();
+    omarchy_dir(&home, crate::env::value("ELY_OMARCHY_DIR"))
+}
+
+/// Omarchy keeps its state under `~/.local/state`, whatever `XDG_STATE_HOME` says.
+fn omarchy_dir(home: &Path, over: Option<String>) -> Option<PathBuf> {
+    if let Some(dir) = over {
+        return Some(PathBuf::from(dir));
+    }
+    let current = home.join(".local/state/omarchy/current");
+    current.is_dir().then_some(current)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{data_dir, omarchy_dir};
+    use crate::AppId;
+
+    #[test]
+    fn each_app_has_its_own_directory_under_elyoffice() {
+        let doc = data_dir(AppId::Doc).unwrap();
+        let mail = data_dir(AppId::Mail).unwrap();
+
+        assert!(doc.ends_with("ElyOffice/ely-doc"), "{}", doc.display());
+        assert!(mail.ends_with("ElyOffice/ely-mail"), "{}", mail.display());
+        assert_ne!(doc, mail);
+    }
+
+    #[test]
+    fn omarchy_is_found_under_home_and_the_override_wins() {
+        let home = tempfile::tempdir().unwrap();
+        assert_eq!(omarchy_dir(home.path(), None), None);
+
+        let current = home.path().join(".local/state/omarchy/current");
+        std::fs::create_dir_all(&current).unwrap();
+        assert_eq!(omarchy_dir(home.path(), None), Some(current));
+        assert_eq!(
+            omarchy_dir(home.path(), Some("/elsewhere".into())),
+            Some("/elsewhere".into())
+        );
+    }
+}