fnva - Fast Environment Version Alter

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Cross-platform environment switcher for Java, Claude Code (CC), and LLM setups. Rust single binary with fast startup and zero runtime dependencies.

Install

• npm: npm install -g fnva
• Cargo: cargo install fnva
• Binary: download from Releases and add to PATH.

Quick start

• Init shell (Bash/Zsh): eval "$(fnva env env --shell bash)"
  PowerShell: fnva env env --shell powershell | Out-String | Invoke-Expression
• Scan Java: fnva java scan
• Switch Java for current session: eval "$(fnva java use jdk-17)"
• Switch CC profile: eval "$(fnva cc use glmcc)"

What it does

• Manages multiple Java, CC, and generic LLM configurations.
• Generates shell snippets to activate environments per session or by default.
• Stores config at ~/.fnva/config.toml (Windows: %USERPROFILE%\.fnva\config.toml).
• Ships as a single binary; no background daemon.

Build/test locally

cargo fmt && cargo clippy --all-targets -- -D warnings
cargo test
cargo build --release

For platform bundles: npm run build:platforms