enhance commandline parsing

* prefere settings in Cargo.toml
* introduce option dbdriver

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

src/cli.yml

@@ -1,8 +1,8 @@
-name: AdvoTracker
+name: myapp
-version: "0.0.1"
+version: "1.0"
-author: Ralf Zerres <ralf.zerres@networkx.de>
+author: Networkx GmbH <info@networkx.de>
-#about: AdvoTracker unterstützt Anwälte bei der Erfassung relevanter Mandatsdaten in einer Online-Beratung 
+about: capture relevant data encountered during an online legal advice
-about: AdvoTracker supports lawyers to capture relevant data encountered during an online legal advice
+after_help: in Zusammenarbeit mit HIEDEMANN Rechtsanwälte
 args:
     - config:
         short: c
@@ -10,8 +10,18 @@ args:
         value_name: FILE
         help: Sets a custom config file
         takes_value: true
+    - dbdriver:
+        short: D
+        long: dbdriver
+        help: Driver used to connect to database
+        possible_values:
+           - mysql
+           - postgres
+           - sqlite
+        takes_value: true
     - verbose:
         short: v
+        long: verbose
         multiple: true
         help: Sets the level of verbosity
 subcommands:

src/main.rs

@@ -14,8 +14,31 @@ fn main() {
     println!("{}", &res);
 
     let yaml = load_yaml!("cli.yml");
-    let _matches = App::from_yaml(yaml).get_matches();
+    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"),
+    }
+
+
+    // Starting the program logic
     let res = t!("main.start", lang);
     println!("{}", &res);
 }