Figment Backend

Updates the config module to use the figment crate internally, which allows us to support default and environment configs.

src/cli.rs

@@ -2,7 +2,7 @@ use std::path::PathBuf;
 
 use clap::{Clap, IntoApp};
 use log::LevelFilter;
-use serde::de::DeserializeOwned;
+use serde::{de::DeserializeOwned, Serialize};
 use thiserror::Error;
 
 use crate::config;
@@ -45,13 +45,13 @@ pub trait AppOpts: Clap {
     }
 }
 
-pub trait ConfigurableAppOpts<C: DeserializeOwned>: AppOpts {
+pub trait ConfigurableAppOpts<C: DeserializeOwned + Default + Serialize>: AppOpts {
     fn try_init_with_config() -> Result<(Self, C), CliError> {
         let opts = Self::try_init()?;
 
         let app = <Self as IntoApp>::into_app();
 
-        let conf = config::from_default_paths(app.get_name(), &opts.get_additional_config_paths())
+        let conf = config::from_defaults(app.get_name(), &opts.get_additional_config_paths())
             .map_err(CliError::Config)?;
 
         Ok((opts, conf))