Update Rust binary crates

Installation

cargo install --locked cargo-syu

After that, the command can update itself.

Usage

The default operation is to list and update packages.

cargo syu

Don't update packages, but list available updates.

cargo syu --list

Take git packages into consideration.

cargo syu --git

Development plan

• Find cargo install root from ~/.cargo/config.toml.
• List installed packages.
• Update installed packages.
• Find and update git packages.
• Detect registry URL from .crates.toml.
• Print progress bar for metadata fetching.
• Improved handling of errors
  1. Don't fail immediately if one package operation failed.
  2. Display warning for failed package, but continue for remaining packages.
• Allow more or less verbose output.
• Allow printing of outdated packages only.
• Add more code documentation.
• Write unit and integration tests.
• Add --ask flag to require user confirmation before installing packages.