TM - The alacritty Theme Changer

I change themes frequently during my Terminal sessions in alacritty. For base16 themes, there is also a lot of overlap between themes used by the terminal as well as themes used by vim.

This tool is just a small little wrapper that will allow theme changes.

Rust learnings

• Pattern matching (need to learn more patterns of Pattern Matching!)
• log und env_logger
• std::fs::read_dir
• Splitting up a chain of .unwrap() into let bindings to resolve borrow-checker errors.
• const types need types to be provided.
• .collect<T>() where T can be Vec<&str> or other types. AKA .collect<Vec<&str>>().
• s("foo") convenience fn which internally does .to_string() (reduces noise)
• Single match can be just a let statement, as per Clippy (variable pattern matching like Python)
• &String can usually be converted to &str, and Clippy will remind you of this. So use him!
• fold_ok: Does a fold over an input collection of Option types. fold has an accumulator. If there is a None that is encountered, we can choose to just skip over it.
• .is_ok() can be used instead of redundant single-use if let Ok(_) statements.
• There are only limited things we can do when defining const values:
  • calls in constants are limited to constant functions, tuple structs and tuple variants

Questions

• How does the use statement work? Does it matter if we add use in a method call and don't hoist it to the top?
• When should we decide b/w using &str and String types?
• .clone(): when to use and how to avoid.
• pattern-matching with variables: possible if we have an if pattern == variable in our arms.
• What is a constant function ?