Added some basic code

Added basic settings representation and a way to load them from either
a YAML or Json file.

Cargo.toml

@@ -7,3 +7,8 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+serde = {version = "1.0", features = ["derive"]}
+serde_yaml = "0.7"
+serde_json = "1.0"
+log = "0.4"
+simplelog = "0.7"

src/lib.rs

@@ -1,7 +1,45 @@
+use std::fs::File;
+use std::io::Result;
+use std::path::PathBuf;
+
+extern crate log;
+extern crate simplelog;
+use log::{info, warn};
+use simplelog::*;
+
 #[cfg(test)]
-mod tests {
-    #[test]
-    fn it_works() {
-        assert_eq!(2 + 2, 4);
+mod tests;
+
+mod settings;
+use settings::utils;
+
+#[allow(dead_code)]
+pub fn init() -> std::result::Result<(), log::SetLoggerError> {
+    match CombinedLogger::init(vec![
+        TermLogger::new(
+            LevelFilter::Warn,
+            Config::default(),
+            TerminalMode::Mixed,
+        )
+        .unwrap(),
+        WriteLogger::new(
+            LevelFilter::Info,
+            Config::default(),
+            File::create("core.log").unwrap(),
+        ),
+    ]) {
+        Err(why) => {
+            warn!("Could not initialize logger: {}", why.to_string());
+            Err(why)
+        }
+        Ok(_) => {
+            info!("Logger initialized");
+            Ok(())
+        }
     }
 }
+
+#[allow(dead_code)]
+fn import_words(path: PathBuf) -> Result<String> {
+    utils::read_file(&path)
+}

src/settings/mod.rs

@@ -0,0 +1,94 @@
+extern crate serde;
+extern crate serde_json;
+extern crate serde_yaml;
+use serde::Deserialize;
+
+extern crate log;
+use log::warn;
+
+// mod utils;
+pub mod utils;
+
+#[allow(dead_code)]
+const RULESET_CURRENT_VERSION: &'static str = "1";
+
+pub enum SettingsType {
+    Yaml,
+    Json,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Settings {
+    #[serde(default = "Settings::get_ruleset_version")]
+    version: String,
+    #[serde(default)]
+    categories: Vec<(String, String)>,
+    #[serde(default)]
+    rules: Vec<(String, String)>,
+}
+
+impl Settings {
+    #[allow(dead_code)]
+    pub fn new() -> Self {
+        Self {
+            version: Self::get_ruleset_version(),
+            categories: Vec::new(),
+            rules: Vec::new(),
+        }
+    }
+
+    fn get_ruleset_version() -> String {
+        String::from(RULESET_CURRENT_VERSION)
+    }
+
+    #[allow(dead_code)]
+    pub fn import(path: &std::path::PathBuf) -> std::io::Result<Self> {
+        use SettingsType::*;
+        let display = path.display();
+        let extension = path.extension().unwrap();
+        let extension = extension.to_str().unwrap();
+        let method = match extension {
+            "yaml" => Yaml,
+            "json" => Json,
+            _ => {
+                use std::io::{Error, ErrorKind};
+                return Err(Error::new(
+                    ErrorKind::InvalidInput,
+                    "File must have \"yaml\" or \"json\" extension",
+                ));
+            }
+        };
+        let content = match utils::read_file(&path) {
+            Err(e) => {
+                warn!("Could not read file {}: {}", display, e.to_string());
+                return Err(e);
+            }
+            Ok(content) => content,
+        };
+
+        let settings: Settings = match method {
+            Yaml => match serde_yaml::from_str(&content) {
+                Err(e) => {
+                    warn!("Could not import settings: {}", e.to_string());
+                    return Err(std::io::Error::new(
+                        std::io::ErrorKind::InvalidInput,
+                        e,
+                    ));
+                }
+                Ok(val) => val,
+            },
+            Json => match serde_json::from_str(&content) {
+                Err(e) => {
+                    warn!("Could not import settings: {}", e.to_string());
+                    return Err(std::io::Error::new(
+                        std::io::ErrorKind::InvalidInput,
+                        e,
+                    ));
+                }
+                Ok(val) => val,
+            },
+        };
+
+        Ok(settings)
+    }
+}

src/settings/utils.rs

@@ -0,0 +1,28 @@
+extern crate log;
+use log::{info, warn};
+
+use std::fs::File;
+use std::io::{Read, Result};
+use std::path::PathBuf;
+
+pub fn read_file(path: &PathBuf) -> Result<String> {
+    let display = path.display();
+    let mut file = match File::open(&path) {
+        Err(why) => {
+            warn!("Could not read {}: {}", display, why.to_string());
+            return Err(why);
+        }
+        Ok(file) => file,
+    };
+    let mut content = String::new();
+    match file.read_to_string(&mut content) {
+        Err(why) => {
+            warn!("Could not read {}: {}", display, why.to_string());
+            return Err(why);
+        }
+        Ok(_) => {
+            info!("Content of {} read", display);
+            Ok(content)
+        }
+    }
+}

src/tests.rs

@@ -0,0 +1,4 @@
+#[test]
+fn it_works() {
+    assert_eq!(2 + 2, 4);
+}