functional update

* convert from Rust 2015 to Rust 2018
* convert from slog to tracing
  new module-system handling (macros and crates)

Signed-off-by: Ralf Zerres <ralf.zerres@networkx.de>

Cargo.toml

@@ -5,6 +5,7 @@ authors = ["Ralf Zerres <ralf.zerres@networkx.de>"]
 description = "Supports lawyers to capture relevant data encountered during an online legal advice\n"
 readme = "README.md"
 license = "MIT"
+edition = "2018"
 
 [profile.release]
 # optimize to max speed
@@ -25,4 +26,3 @@ features = [ "postgres", "sqlite" ]
 version = "0.10.0"
 
 [dependencies.locales]
-version = "0.1.0"

src/main.rs

@@ -4,43 +4,23 @@
  * SPDX-License-Identifier: 0BSD
  */
 
-#[macro_use]
-extern crate clap;
-extern crate locales;
+// Rust nightly supports procedural macros!
+//#![feature(proc_macro)]
+//#![deny(rust_2018_idioms)]
 
-use clap::App;
+//use clap::{ArgMatches, Arg, App, SubCommand};
+use clap::ArgMatches;
+use serde::Deserialize;
+use std::{env, process};
+use dotenv::dotenv;
 use locales::t;
+use tracing::{debug, info, instrument, span, Level};
 
-fn main() {
-    // set locale
-    let lang= "de";
+#[derive(Deserialize, Debug)]
+struct Environment {
+    test_lang: String,
+}
 
-    // handle commandline arguments with clap (relative path to cli.yml)
-    let res = t!("parse.arguments", lang);
-    println!("{}", &res);
-
-    let yaml = load_yaml!("cli.yml");
-    let matches = App::from_yaml(yaml)
-        .name(crate_name!())
-        .version(crate_version!())
-        .author(crate_authors!())
-        .about(crate_description!())
-        .get_matches();
-
-    // Gets a options value if supplied by user. otherwise set defaults
-    let config = matches.value_of("config").unwrap_or("default.conf");
-    println!("Value for config: {}", config);
-
-    let dbdriver = matches.value_of("dbdriver").unwrap_or("sqlite3");
-    println!("Value for database driver: {}", dbdriver);
-
-    // Vary the output based on how many times the user used the "verbose" flag
-    // (i.e. ' -v -v -v' or 'myprog -vvv' vs 'myprog -v'
-    match matches.occurrences_of("v") {
-        0 => println!("No verbose info"),
-        1 => println!("Some verbose info"),
-        2 => println!("Tons of verbose info"),
-        3 | _ => println!("Don't be crazy"),
     }
 
     // You can handle information about subcommands by requesting their matches by name
@@ -52,6 +32,39 @@ fn main() {
             println!("Printing normally...");
         }
     }
+fn main() {
+    //initialize tracing eco-system
+    use tracing_subscriber::fmt;
+
+    let span = span!(Level::TRACE, "advotracker_main");
+    let _enter = span.enter();
+    let subscriber = fmt::Subscriber::builder()
+        .with_env_filter("advotracker=trace")
+        .finish();
+
+    tracing::subscriber::with_default(subscriber, || {
+        // get testing environment (.env)
+        debug!(
+            message = "Reading Environment ...",
+            finished = "no!"
+        );
+
+        dotenv().ok();
+        let mut lang = env::var("LANG").unwrap_or("en".to_string());
+        match envy::from_env::<Environment>() {
+            Ok(environment) => {
+                if environment.test_lang != lang { lang = environment.test_lang; }
+            },
+            Err(e) => println!("Couldn't read LANG ({:#?})", e),
+        };
+        let res = t!("parse.environment", lang);
+        info!(target: "advotracker_event", "{}", res);
+        info!(target: "advotracker_event", "{}", lang);
+
+        // handle commandline arguments with clap (relative path to cli.yml)
+        let res = t!("parse.arguments", lang);
+        info!(target: "advotracker_event", "{}", res);
+
 
     // Starting the program logic
     let res = t!("main.start", lang);