Store repo names and selected repo in state

gdn/src/data.rs

@@ -10,7 +10,7 @@ mod v1;
 
 pub use self::{
     datadir::{LockedDataDir, UnlockedDataDir},
-    v1::{State, VERSION, load_state, save_state},
+    v1::{State, VERSION, load_state, tidy},
 };
 
 fn migrate(dir: &LockedDataDir) -> anyhow::Result<()> {

gdn/src/data/v0.rs

@@ -6,7 +6,7 @@ pub const VERSION: u32 = 0;
 
 pub fn migrate(dir: &LockedDataDir) -> anyhow::Result<()> {
     dir.require_version(VERSION)?;
-    v1::save_state(dir, &v1::State::default())?;
+    v1::save_state(dir, v1::State::default())?;
     dir.write_version(v1::VERSION)?;
     Ok(())
 }

gdn/src/data/v1.rs

@@ -1,24 +1,101 @@
-use std::path::PathBuf;
+use std::{collections::HashMap, fs, path::PathBuf};
 
+use anyhow::anyhow;
 use serde::{Deserialize, Serialize};
 
+use crate::ids::RepoId;
+
 use super::{LockedDataDir, UnlockedDataDir};
 
 pub const VERSION: u32 = 1;
 
 #[derive(Default, Serialize, Deserialize)]
 pub struct State {
-    pub name: Option<String>,
+    pub repos: HashMap<RepoId, String>,
+    pub selected_repo: Option<RepoId>,
+}
+
+impl State {
+    pub fn normalize(&mut self) {
+        if let Some(selected) = self.selected_repo {
+            if !self.repos.contains_key(&selected) {
+                self.selected_repo = None;
+            }
+        }
+    }
 }
 
 pub fn state_file(dir: &UnlockedDataDir) -> PathBuf {
     dir.path().join("state.json")
 }
 
+pub fn repos_dir(dir: &UnlockedDataDir) -> PathBuf {
+    dir.path().join("repos")
+}
+
+pub fn repo_dir(dir: &UnlockedDataDir, id: RepoId) -> PathBuf {
+    repos_dir(dir).join(id.to_string())
+}
+
 pub fn load_state(dir: &UnlockedDataDir) -> anyhow::Result<State> {
     dir.read_json(&state_file(dir))
 }
 
-pub fn save_state(dir: &LockedDataDir, state: &State) -> anyhow::Result<()> {
-    dir.write_json(&state_file(dir), state)
+pub fn save_state(dir: &LockedDataDir, mut state: State) -> anyhow::Result<()> {
+    state.normalize();
+    dir.write_json(&state_file(dir), &state)
+}
+
+pub fn add_repo(dir: &LockedDataDir, name: String) -> anyhow::Result<RepoId> {
+    let id = RepoId::new();
+
+    let mut state = load_state(dir)?;
+    state.repos.insert(id, name);
+    save_state(dir, state)?;
+
+    fs::create_dir_all(repos_dir(dir))?;
+    // TODO Initialize bare repo
+    Ok(id)
+}
+
+pub fn remove_repo(dir: &LockedDataDir, id: RepoId) -> anyhow::Result<()> {
+    let mut state = load_state(dir)?;
+    state.repos.remove(&id).is_none();
+    save_state(dir, state)?;
+
+    // TODO Check if this works with read-only files
+    fs::remove_dir_all(repo_dir(dir, id))?;
+
+    Ok(())
+}
+
+pub fn set_repo_name(dir: &LockedDataDir, id: RepoId, name: String) -> anyhow::Result<()> {
+    let mut state = load_state(dir)?;
+    *state
+        .repos
+        .get_mut(&id)
+        .ok_or_else(|| anyhow!("no repo with id {id}"))? = name;
+    save_state(dir, state)?;
+    Ok(())
+}
+
+pub fn select_repo(dir: &LockedDataDir, id: Option<RepoId>) -> anyhow::Result<()> {
+    let mut state = load_state(dir)?;
+    state.selected_repo = id;
+    save_state(dir, state)?;
+    Ok(())
+}
+
+pub fn tidy(dir: &LockedDataDir) -> anyhow::Result<()> {
+    let state = load_state(dir)?;
+
+    // TODO Detect repo dirs that should not exist, and let the user now.
+    //
+    // The repo dir contains very important user data. To avoid data loss, we
+    // must not delete files or directories that should not exist. Instead, we
+    // should let the user know so they can check if they want to keep them.
+
+    // TODO Create repos that don't exist.
+
+    Ok(())
 }