supply alternate default colors for MCFLY_LIGHT

Author: dmfay

README.md

@@ -8,7 +8,7 @@
 McFly replaces your default `ctrl-r` shell history search with an intelligent search engine that takes into account
 your working directory and the context of recently executed commands. McFly's suggestions are prioritized
 in real time with a small neural network.
- 
+
 TL;DR: an upgraded `ctrl-r` where history results make sense for what you're working on right now.
 
 ## Features
@@ -166,10 +166,13 @@ To avoid McFly's UI messing up your scrollback history in iTerm2, make sure this
 <img src="/docs/iterm2.jpeg" alt="iterm2 UI instructions">
 
 ## Settings
-A number of settings can be set via environment variables. To set a setting you should add the following snippets to your `~/.bashrc` / `~/.zshrc` / `~/.config/fish/config.fish`.
+
+Settings, in particular the interface colors, may be configured in [`~/.mcfly/mcfly.toml`](https://github.com/cantino/mcfly/blob/crossterm-and-colors/mcfly.example.toml).
+
+A number of settings can also be set via environment variables. To set a setting you should add the following snippets to your `~/.bashrc` / `~/.zshrc` / `~/.config/fish/config.fish`.
 
 ### Light Mode
-To swap the color scheme for use in a light terminal, set the environment variable `MCFLY_LIGHT`.
+To swap the default color scheme for use in a light terminal, set the environment variable `MCFLY_LIGHT`.
 
 bash / zsh:
 ```bash

src/settings.rs

@@ -258,7 +258,25 @@ impl Settings {
             )
             .get_matches();
 
-        let mut settings: Settings = Figment::from(Serialized::defaults(Settings::default()))
+        let mut default_settings = Settings::default();
+
+        if env::var("MCFLY_LIGHT").is_ok() {
+            default_settings.colors = Colors {
+                menu_bg: "Blue".to_string(),
+                menu_fg: "White".to_string(),
+                menu_deleting_bg: "Red".to_string(),
+                menu_deleting_fg: "Cyan".to_string(),
+                bg: "White".to_string(),
+                fg: "Black".to_string(),
+                prompt_fg: "Black".to_string(),
+                highlight: "Blue".to_string(),
+                cursor_bg: "Dark_Grey".to_string(),
+                cursor_fg: "White".to_string(),
+                cursor_highlight: "White".to_string(),
+            };
+        }
+
+        let mut settings: Settings = Figment::from(Serialized::defaults(default_settings))
             .merge(Toml::file(Settings::mcfly_config_path()))
             .extract()
             .unwrap();