termscp/CLAUDE.md

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Project Overview

termscp is a terminal file transfer client with a TUI (Terminal User Interface), supporting SFTP, SCP, FTP/FTPS, Kube, S3, SMB, and WebDAV protocols. It features a dual-pane file explorer (local + remote), bookmarks, system keyring integration, file watching/sync, an embedded terminal, and customizable themes.

• Language: Rust (edition 2024, MSRV 1.89.0)
• UI Framework: tuirealm v3 (built on crossterm)
• File Transfer: remotefs ecosystem

Build & Development Commands

# Build
cargo build
cargo build --release
cargo build --no-default-features              # minimal build without SMB/keyring

# Test (CI-equivalent)
cargo test --no-default-features --features github-actions --no-fail-fast

# Run a single test
cargo test <test_name> -- --nocapture

# Run tests for a module
cargo test --lib filetransfer::
cargo test --lib config::params::tests

# Lint
cargo clippy -- -Dwarnings

# Format
cargo fmt --all -- --check      # check only
cargo fmt --all                 # fix

System Dependencies (for building)

• Linux: libdbus-1-dev, libsmbclient-dev
• macOS: pkg-config, samba (brew, with force link)

Feature Flags

• smb (default): SMB/Samba protocol support
• keyring (default): System keyring integration for password storage
• smb-vendored: Vendored SMB library (for static builds)
• github-actions: CI flag — disables real keyring in tests, uses file-based storage
• isolated-tests: For parallel test isolation

Architecture

Application Lifecycle

main.rs → parse CLI args → ActivityManager::new() → ActivityManager::run()
                                                        ↓
                                              Activity loop (draw → poll → update)
                                              ├── AuthActivity (login/bookmarks)
                                              ├── FileTransferActivity (dual-pane explorer)
                                              └── SetupActivity (configuration)

ActivityManager owns a Context that is passed between activities. Each activity takes ownership of the Context on on_create() and returns it on on_destroy().

Key Modules

Module	Path	Purpose
activity_manager	src/activity_manager.rs	Orchestrates activity lifecycle and transitions
ui/activities	src/ui/activities/{auth,filetransfer,setup}/	Three main screens, each implementing the Activity trait
ui/context	src/ui/context.rs	Shared Context struct (terminal, config, bookmarks, theme)
filetransfer	src/filetransfer/	Protocol enum, RemoteFsBuilder, connection parameters
host	src/host/	HostBridge trait — abstracts local (Localhost) and remote (RemoteBridged) file operations
explorer	src/explorer/	FileExplorer — directory navigation, sorting, filtering, transfer queue
system	src/system/	BookmarksClient, ConfigClient, ThemeProvider, SshKeyStorage, KeyStorage trait
config	src/config/	TOML-based serialization for themes, bookmarks, user params

Core Traits

• Activity (src/ui/activities/mod.rs): on_create, on_draw, will_umount, on_destroy — UI screen lifecycle
• HostBridge (src/host/bridge.rs): Unified file operations interface (connect, list_dir, open_file, mkdir, remove, rename, copy, etc.)
• KeyStorage (src/system/keys/mod.rs): get_key/set_key — password storage abstraction (keyring or encrypted file fallback)

Conditional Compilation

The build.rs defines cfg aliases via cfg_aliases:

• posix, macos, linux, win — platform shortcuts
• smb, smb_unix, smb_windows — feature + platform combinations

Platform-specific dependencies: SSH and FTP crates use different TLS backends on Unix vs Windows. SMB support is completely gated behind the smb feature flag.

File Transfer Protocols

FileTransferProtocol enum maps to protocol-specific parameter types (ProtocolParams enum) and RemoteFsBuilder constructs the appropriate RemoteFs client. Each protocol has its own params struct (e.g., GenericProtocolParams for SSH-based, AwsS3Params, KubeProtocolParams, SmbParams, WebDAVProtocolParams).

Code Conventions

• rustfmt: group_imports = "StdExternalCrate", imports_granularity = "Module"
• Error handling: Custom error types with thiserror, module-level Result aliases (e.g., HostResult<T>)
• Builder pattern: Used for RemoteFsBuilder, HostBridgeBuilder
• Client pattern: System services wrapped as clients (BookmarksClient, ConfigClient)
• Tests: Unit tests in #[cfg(test)] blocks within source files. Tests requiring serial execution use #[serial] from serial_test
• Encryption: Bookmark passwords encrypted with magic-crypt; keys stored in system keyring or encrypted file

Other conventions

• Always put plans to ./.claude/plans/