feat: implement hierachical config

.gitignore

@@ -3,10 +3,6 @@
 # will have compiled files and executables
 /target/
 
-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk
 

Cargo.lock

@@ -0,0 +1,324 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
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+]
+
+[[package]]
+name = "arrayvec"
+version = "0.4.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
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+
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+version = "1.0.0"
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+
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+
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+
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+
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Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "ERRMS"
+name = "errms"
 version = "0.1.0"
 authors = ["Keanu Doelle <ares@anghenfil.de>"]
 edition = "2018"
@@ -7,3 +7,6 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+config = "0.10.1"
+serde_derive = "1.0.104"
+serde = "1.0.104"

config/default.toml

@@ -0,0 +1,7 @@
+[database]
+connection_string = "mysql://mysql:qwertz@localhost:3306/ERRMS"
+
+[application]
+default_language = "de-DE"
+fallback_language = "en-US"
+loglevel = "debug"

src/helper/mod.rs

@@ -0,0 +1,3 @@
+extern crate config;
+
+pub mod settings;

src/helper/settings.rs

@@ -0,0 +1,50 @@
+use config::{Config, ConfigError, Environment, File};
+use std::env;
+
+#[derive(Debug, Deserialize)]
+pub struct Database {
+    pub connection_string: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Application {
+    pub default_language: String,
+    pub fallback_language: String,
+    pub loglevel: String,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Settings {
+    pub database: Database,
+    pub application: Application,
+}
+
+impl Settings {
+    pub fn new() -> Result<Self, ConfigError> {
+        let mut s = Config::new();
+
+        // Start off by merging in the "default" configuration file
+        s.merge(File::with_name("config/default"))?;
+
+        // Add in the current environment file
+        // Default to 'development' env
+        // Note that this file is _optional_
+        let env = env::var("RUN_MODE").unwrap_or("development".into());
+        s.merge(File::with_name(&format!("config/{}", env)).required(false))?;
+
+        // Add in a local configuration file
+        // This file shouldn't be checked in to git
+        s.merge(File::with_name("config/local").required(false))?;
+
+        // Add in settings from the environment (with a prefix of APP)
+        // Eg.. `APP_DEBUG=1 ./target/app` would set the `debug` key
+        s.merge(Environment::with_prefix("app"))?;
+
+        // Now that we're done, let's access our configuration
+        // println!("debug: {:?}", s.get_bool("debug"));
+        // println!("database: {:?}", s.get::<String>("database.url"));
+
+        // You can deserialize (and thus freeze) the entire configuration as
+        s.try_into()
+    }
+}

src/main.rs

@@ -1,3 +1,20 @@
+extern crate config;
+extern crate serde;
+#[macro_use]
+extern crate serde_derive;
+
+pub mod helper;
+
+use helper::settings::Settings;
+
 fn main() {
-    println!("Hello, world! Test1");
+    let settings_result = Settings::new();
+
+    if settings_result.is_err() {
+        println!("Failed to read config: {:#?}", settings_result.err());
+        std::process::exit(1)
+    }
+
+    let settings = settings_result.unwrap();
+    println!("Hello, world! Default Language: {}", settings.application.default_language);
 }