CLI and indexer config

[passy]

Build a CLI for cindex, store the directories etc. in an XDG-compliant config.

Scope

Set up a CLI for the index management, persist and read the settings. Don't actually do anything with it yet.

Dependencies

• clap for interface
• rust-xdg for directory constants
• log for basic logging, we probably want to use log4rs once we have a background daemon

Unsure about configuration/persistence:

• rust-ini
• rust-config - Better docs and list types which we need, but seems over-engineered. Why not YAML/JSON/TOML?
• toml-config - Works with Serde which seems quite interesting. Example usage here.

  UI

For v0.1, very basic management of directories.

# Add one new directory
gt-indexer add <dir>
gt-indexer rm <dir>
gt-indexer ls

Testing

The parser is heavily string-based, so even if it's just the direct user interface, I really want to have tests for them. Unit tests should be fine here. Should also get tests for the disk storage.

[daithiocrualaoich]

If you need a tie-breaker for the config question go with TOML.