chore(chat-cli): switch transport at runtime via --transport flag

Both file and logos-delivery transports are now compiled into a single
binary and selected at runtime (default: logos-delivery), replacing the
env-var-driven build-time cfg.

.github/workflows/ci.yml

@@ -16,8 +16,11 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - run: rustup update stable && rustup default stable
-      - run: cargo build --verbose
+      # chat-cli's build.rs unconditionally links liblogosdelivery and requires
-      - run: cargo test --verbose
+      # LOGOS_DELIVERY_LIB_DIR. The smoketest job builds and exercises it under
+      # Nix; here we keep the toolchain-only job fast by skipping it.
+      - run: cargo build --verbose --workspace --exclude chat-cli
+      - run: cargo test --verbose --workspace --exclude chat-cli
 
   clippy:
     name: Clippy
@@ -26,7 +29,7 @@ jobs:
       - uses: actions/checkout@v4
       - run: rustup update stable && rustup default stable
       - run: rustup component add clippy
-      - run: cargo clippy --all-targets --all-features -- -D warnings
+      - run: cargo clippy --all-targets --all-features --workspace --exclude chat-cli -- -D warnings
 
   fmt:
     name: Format

README.md

@@ -4,16 +4,17 @@ Supporting library for Logos-chat
 ## Example app
 
 [`bin/chat-cli`](bin/chat-cli/) is an end-to-end encrypted CLI chat app
-built on this library.  It uses [logos-delivery](https://github.com/logos-messaging/logos-delivery)
+built on this library. By default it uses [logos-delivery](https://github.com/logos-messaging/logos-delivery)
 (Waku-based) as the transport so two users anywhere in the world can chat by
-sharing an intro bundle.
+sharing an intro bundle. A local file transport is also bundled in; pick at
+runtime with `--transport <logos-delivery|file>`.
 
 ```sh
 # Build logos-delivery with Nix
 nix build .#logos-delivery
 # Build chat-cli with Cargo
 LOGOS_DELIVERY_LIB_DIR=./result/lib cargo build --release -p chat-cli
-# Run binary
+# Run binary (defaults to --transport logos-delivery)
 ./target/release/chat-cli --name alice
 ```
 

bin/chat-cli/Cargo.toml

@@ -21,6 +21,3 @@ base64 = "0.22"
 thiserror = "2"
 tracing = "0.1"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-
-[lints.rust]
-unexpected_cfgs = { level = "warn", check-cfg = ['cfg(logos_delivery)'] }

bin/chat-cli/README.md

@@ -4,8 +4,6 @@ A terminal chat application built on top of libchat. End-to-end encrypted messag
 
 ## Building
 
-### With logos-delivery transport (recommended)
-
 [logos-delivery](https://github.com/logos-messaging/logos-delivery) is exposed as a Nix package.
 Build it once, then point `LOGOS_DELIVERY_LIB_DIR` at the result:
 
@@ -16,31 +14,35 @@ LOGOS_DELIVERY_LIB_DIR=./result/lib cargo build --release -p chat-cli
 
 The binary lands at `target/release/chat-cli`.
 
-### File transport only (no Nix required)
-
-```bash
-cargo build --release -p chat-cli
-```
-
 ## Transports
 
-| Transport | Description |
+Both transports are compiled into the binary and selected at runtime via `--transport`:
-|-----------|-------------|
-| File (default) | Shared directory; no network needed — great for local testing |
-| logos-delivery | Embedded Waku node on the logos.dev network |
 
-The transport is selected automatically at compile time: if `LOGOS_DELIVERY_LIB_DIR` is set when building, logos-delivery is used; otherwise the file transport is used.
+| Value (`--transport`) | Description |
+|-----------------------|-------------|
+| `logos-delivery` (default) | Embedded Waku node on the logos.dev network |
+| `file` | Shared directory; no network needed — great for local testing |
 
-## Quick start (file transport)
+## Quick start
 
-Run two instances in separate terminals, pointing at the same data directory:
+Run two instances in separate terminals:
 
 ```bash
 # Terminal 1
-cargo run -p chat-cli -- --name alice
+cargo run -p chat-cli -- --name alice --port 60001
 
 # Terminal 2
-cargo run -p chat-cli -- --name bob
+cargo run -p chat-cli -- --name bob --port 60002
+```
+
+For local-only testing without any network dependency, use the file transport:
+
+```bash
+# Terminal 1
+cargo run -p chat-cli -- --name alice --transport file
+
+# Terminal 2
+cargo run -p chat-cli -- --name bob --transport file
 ```
 
 ### Establishing a connection
@@ -49,20 +51,14 @@ cargo run -p chat-cli -- --name bob
 2. In Bob's terminal, type `/connect <paste bundle here>`.
 3. Bob's "Hello!" message appears in Alice's terminal. Both can now chat.
 
-## logos-delivery transport
+## Options
-
-After building with `LOGOS_DELIVERY_LIB_DIR` set, run:
-
-```bash
-./target/release/chat-cli --name alice
-```
-
-Optional flags:
 
 | Flag | Default | Description |
 |------|---------|-------------|
-| `--db <path>` | *(ephemeral)* | SQLite file for persistent identity across restarts |
+| `--transport <kind>` | `logos-delivery` | Transport to use (`logos-delivery` or `file`) |
-| `--preset <name>` | `logos.dev` | Network preset (`logos.dev` or `twn`) |
+| `--data <dir>` | `tmp/chat-cli-data` | Data directory (UI state and default SQLite path) |
+| `--db <path>` | `<data>/<name>.db` | SQLite file for persistent identity |
+| `--preset <name>` | `logos.dev` | logos-delivery network preset |
 | `--port <n>` | `60000` | TCP port for the embedded logos-delivery node |
 | `--log-file <path>` | *(stderr, off)* | Write logs to a file instead of stderr |
 
@@ -80,7 +76,7 @@ Optional flags:
 | `/clear` | Clear current chat's message history |
 | `/quit` · `Esc` · `Ctrl+C` | Exit |
 
-## Storage (file transport)
+## Storage
 
 All data lives under `tmp/chat-cli-data/` by default (override with `--data`):
 
@@ -88,7 +84,7 @@ All data lives under `tmp/chat-cli-data/` by default (override with `--data`):
 |------|----------|
 | `<name>.db` | SQLite — identity keys, ratchet state, chat metadata (encrypted) |
 | `<name>_state.json` | UI state — message history, active chat |
-| `transport/<name>/` | Inbox directory watched for incoming messages |
+| `transport/<name>/` | Inbox directory watched for incoming messages (file transport only) |
 
 The SQLite database can be inspected with *DB Browser for SQLite*: password `chat-cli`, cipher `SQLCipher 4 defaults`.
 
@@ -97,7 +93,7 @@ The SQLite database can be inspected with *DB Browser for SQLite*: password `cha
 ```
 bin/chat-cli/
 ├── src/
-│   ├── main.rs           entry point, CLI arg parsing, transport selection
+│   ├── main.rs           entry point, CLI arg parsing, runtime transport dispatch
 │   ├── app.rs            application state and command handling
 │   ├── ui.rs             ratatui terminal UI
 │   ├── utils.rs          shared helpers
@@ -105,5 +101,5 @@ bin/chat-cli/
 │   └── transport/
 │       ├── file.rs       file-based transport
 │       └── logos_delivery.rs   logos-delivery (Waku) transport + FFI
-└── build.rs              links liblogosdelivery when LOGOS_DELIVERY_LIB_DIR is set
+└── build.rs              links liblogosdelivery (LOGOS_DELIVERY_LIB_DIR required)
 ```

bin/chat-cli/build.rs

@@ -1,20 +1,17 @@
 fn main() {
-    println!("cargo::rustc-check-cfg=cfg(logos_delivery)");
     println!("cargo:rerun-if-env-changed=LOGOS_DELIVERY_LIB_DIR");
 
-    let Ok(lib_dir) = std::env::var("LOGOS_DELIVERY_LIB_DIR") else {
+    let lib_dir = std::env::var("LOGOS_DELIVERY_LIB_DIR").expect(
-        return;
+        "LOGOS_DELIVERY_LIB_DIR must be set; build liblogosdelivery via \
-    };
+         `nix build .#logos-delivery` and point this var at the result/lib directory",
+    );
 
-    println!("cargo:rustc-cfg=logos_delivery");
     println!("cargo:rustc-link-search=native={lib_dir}");
     println!("cargo:rustc-link-lib=dylib=logosdelivery");
 
-    // Set rpath so the binary finds the shared library at runtime.
     let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
     match target_os.as_str() {
-        "macos" => println!("cargo:rustc-link-arg=-Wl,-rpath,{lib_dir}"),
+        "macos" | "linux" => println!("cargo:rustc-link-arg=-Wl,-rpath,{lib_dir}"),
-        "linux" => println!("cargo:rustc-link-arg=-Wl,-rpath,{lib_dir}"),
         other => panic!("unsupported OS for logos-delivery transport: {other}"),
     }
 }

bin/chat-cli/src/main.rs

@@ -3,14 +3,22 @@ mod transport;
 mod ui;
 mod utils;
 
-use std::path::PathBuf;
+use std::path::{Path, PathBuf};
+use std::sync::mpsc;
 
 use anyhow::{Context, Result};
-use clap::Parser;
+use clap::{Parser, ValueEnum};
 use client::DeliveryService;
 
 use app::ChatApp;
 
+#[derive(Copy, Clone, Debug, ValueEnum)]
+#[value(rename_all = "kebab-case")]
+enum TransportKind {
+    File,
+    LogosDelivery,
+}
+
 #[derive(Parser, Debug)]
 #[command(name = "chat-cli", about = "End-to-end encrypted terminal chat")]
 struct Cli {
@@ -18,17 +26,20 @@ struct Cli {
     #[arg(long, short)]
     name: String,
 
-    // ── File-transport options ────────────────────────────────────────────────
+    /// Which delivery transport to use.
-    /// Shared data directory for file transport (both peers must use the same path).
+    #[arg(long, value_enum, default_value_t = TransportKind::LogosDelivery)]
+    transport: TransportKind,
+
+    /// Data directory (used for UI state and the default SQLite path).
     #[arg(long, default_value = "tmp/chat-cli-data")]
     data: PathBuf,
 
-    // ── logos-delivery transport options ──────────────────────────────────────
+    /// Override the SQLite database path (defaults to `<data>/<name>.db`).
-    /// Persistent SQLite database for logos-delivery transport (omit for ephemeral identity).
     #[arg(long)]
     db: Option<PathBuf>,
 
-    /// logos-delivery network preset (`logos.dev` or `twn`).
+    // ── logos-delivery transport options ──────────────────────────────────────
+    /// logos-delivery network preset (e.g. `logos.dev`).
     #[arg(long, default_value = "logos.dev")]
     preset: String,
 
@@ -48,30 +59,54 @@ struct Cli {
 fn main() -> Result<()> {
     let cli = Cli::parse();
     setup_logging(cli.log_file.as_deref())?;
-    #[cfg(logos_delivery)]
-    return run_logos_delivery(cli);
-    #[cfg(not(logos_delivery))]
-    run_file(cli)
-}
-
-#[cfg(not(logos_delivery))]
-fn run_file(cli: Cli) -> Result<()> {
-    use transport::file::FileTransport;
 
     std::fs::create_dir_all(&cli.data).context("failed to create data directory")?;
 
-    println!("Starting chat as '{}'...", cli.name);
+    match cli.transport {
-    println!("Data dir: {}", cli.data.display());
+        TransportKind::File => {
+            let transport_dir = cli.data.join("transport");
+            let (transport, inbound) = transport::file::FileTransport::new(&transport_dir)
+                .context("failed to create file transport")?;
+            run(transport, inbound, &cli)
+        }
+        TransportKind::LogosDelivery => {
+            use transport::logos_delivery::{Config, Service};
 
-    let transport_dir = cli.data.join("transport");
+            eprintln!("Starting logos-delivery node (preset={})...", cli.preset);
-    let (transport, inbound) =
+            eprintln!("This may take a few seconds while connecting to the network.");
-        FileTransport::new(&transport_dir).context("failed to create file transport")?;
+
+            let cfg = Config {
+                preset: cli.preset.clone(),
+                tcp_port: cli.port,
+                ..Default::default()
+            };
+            let (transport, inbound) =
+                Service::start(cfg).context("failed to start logos-delivery")?;
+
+            eprintln!("Node connected. Initializing chat client...");
+            run(transport, inbound, &cli)
+        }
+    }
+}
+
+fn run<D: DeliveryService>(
+    transport: D,
+    inbound: mpsc::Receiver<Vec<u8>>,
+    cli: &Cli,
+) -> Result<()> {
+    let db_path = cli
+        .db
+        .clone()
+        .unwrap_or_else(|| cli.data.join(format!("{}.db", cli.name)));
+    let db_str = db_path
+        .to_str()
+        .context("db path contains non-UTF-8 characters")?
+        .to_string();
 
-    let db_path = cli.data.join(format!("{}.db", cli.name));
     let client = client::ChatClient::open(
         cli.name.clone(),
         client::StorageConfig::Encrypted {
-            path: db_path.to_string_lossy().to_string(),
+            path: db_str,
             key: "chat-cli".to_string(),
         },
         transport,
@@ -91,71 +126,6 @@ fn run_file(cli: Cli) -> Result<()> {
     result
 }
 
-#[cfg_attr(not(logos_delivery), allow(dead_code, unused_variables))]
-fn run_logos_delivery(cli: Cli) -> Result<()> {
-    #[cfg(logos_delivery)]
-    {
-        use transport::logos_delivery::{Config, Service};
-
-        eprintln!("Starting logos-delivery node (preset={})...", cli.preset);
-        eprintln!("This may take a few seconds while connecting to the network.");
-
-        let logos_cfg = Config {
-            preset: cli.preset.clone(),
-            tcp_port: cli.port,
-            ..Default::default()
-        };
-        let (delivery, inbound) =
-            Service::start(logos_cfg).context("failed to start logos-delivery")?;
-
-        eprintln!("Node connected. Initializing chat client...");
-
-        let data_dir = cli
-            .db
-            .as_ref()
-            .and_then(|p| p.parent())
-            .map(|p| p.to_path_buf())
-            .unwrap_or_else(|| cli.data.clone());
-
-        let client = match cli.db {
-            Some(ref path) => {
-                let db_str = path
-                    .to_str()
-                    .context("db path contains non-UTF-8 characters")?
-                    .to_string();
-                client::ChatClient::open(
-                    cli.name.clone(),
-                    client::StorageConfig::Encrypted {
-                        path: db_str,
-                        key: "chat-cli".to_string(),
-                    },
-                    delivery,
-                )
-                .map_err(|e| anyhow::anyhow!("{e:?}"))
-                .context("failed to open persistent client")?
-            }
-            None => client::ChatClient::new(cli.name.clone(), delivery),
-        };
-
-        let mut app = ChatApp::new(client, inbound, &cli.name, &data_dir)?;
-
-        if cli.smoketest {
-            return Ok(());
-        }
-
-        let mut terminal = ui::init().context("failed to initialize terminal")?;
-        let result = run_app(&mut terminal, &mut app);
-        ui::restore().context("failed to restore terminal")?;
-        return result;
-    }
-
-    #[cfg(not(logos_delivery))]
-    anyhow::bail!(
-        "logos-delivery transport is not available in this build.\n\
-         Build with LOGOS_DELIVERY_LIB_DIR set to enable it."
-    )
-}
-
 fn run_app<D: DeliveryService>(terminal: &mut ui::Tui, app: &mut ChatApp<D>) -> Result<()> {
     loop {
         app.process_incoming()?;
@@ -167,7 +137,7 @@ fn run_app<D: DeliveryService>(terminal: &mut ui::Tui, app: &mut ChatApp<D>) ->
     Ok(())
 }
 
-fn setup_logging(log_file: Option<&std::path::Path>) -> Result<()> {
+fn setup_logging(log_file: Option<&Path>) -> Result<()> {
     use tracing_subscriber::EnvFilter;
 
     let filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("warn"));

bin/chat-cli/src/transport.rs

@@ -1,4 +1,2 @@
-#[cfg(not(logos_delivery))]
 pub mod file;
-#[cfg(logos_delivery)]
 pub mod logos_delivery;

flake.nix

@@ -57,6 +57,7 @@
             nativeBuildInputs = [ pkgs.perl pkgs.pkg-config pkgs.cmake ];
             buildType = "release";
             doCheck = false;
+            cargoBuildFlags = [ "--workspace" "--exclude" "chat-cli" ];
 
             postBuild = ''
               cargo run --frozen --release --bin generate-headers --features headers -p client-ffi -- crates/client-ffi/client_ffi.h