logging is disabled by default, add option to enable it

Signed-off-by: Vladimir Markelov <vmatroskin@gmail.com>

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "solkit"
-version = "0.4.4"
+version = "0.4.5"
 authors = ["Vladimir Markelov <vmatroskin@gmail.com>"]
 edition = "2018"
 

changelog

@@ -1,3 +1,10 @@
+solkit (0.4.5) unstable; urgency=medium
+
+  * Logging is disabled by default
+  * Added command-line option `--log` to enable logging
+
+ -- Vladimir Markelov <vmatroskin@gmail.com>  Tue, 22 Dec 2020 13:14:31 -0800
+
 solkit (0.4.4) unstable; urgency=medium
 
   * Added documetation

src/bin/solkit/main.rs

@@ -168,8 +168,10 @@ fn main_loop(cli: &opts::CliOpts) -> Result<()> {
 fn main() -> Result<()> {
     let cli = opts::parse_args();
 
-    let cb = ConfigBuilder::new().set_time_format("[%Y-%m-%d %H:%M:%S%.3f]".to_string()).build();
-    CombinedLogger::init(vec![WriteLogger::new(LevelFilter::Info, cb, File::create("app.log").unwrap())]).unwrap();
+    if cli.logging {
+        let cb = ConfigBuilder::new().set_time_format("[%Y-%m-%d %H:%M:%S%.3f]".to_string()).build();
+        CombinedLogger::init(vec![WriteLogger::new(LevelFilter::Info, cb, File::create("app.log").unwrap())]).unwrap();
+    }
     // info!("started");
 
     let mut stdout = stdout();

src/bin/solkit/opts.rs

@@ -8,6 +8,7 @@ const APP_NAME: &str = "Solitaire Kit";
 pub(crate) struct CliOpts {
     pub(crate) dark: bool,
     pub(crate) filename: String,
+    pub(crate) logging: bool,
 }
 
 fn print_usage(program: &str, opts: &Options) {
@@ -18,12 +19,13 @@ fn print_usage(program: &str, opts: &Options) {
 pub(crate) fn parse_args() -> CliOpts {
     let args: Vec<String> = env::args().collect();
     let program = args[0].clone();
-    let mut cli = CliOpts { dark: true, filename: String::new() };
+    let mut cli = CliOpts { dark: true, filename: String::new(), logging: false };
 
     let mut opts = Options::new();
     opts.optflag("h", "help", "Show this help");
     opts.optopt("t", "theme", "Choose UI theme", "dark | classic");
     opts.optflag("v", "version", "Show application version");
+    opts.optflag("", "log", "Enable logging");
 
     let matches: Matches = match opts.parse(&args[1..]) {
         Ok(m) => m,
@@ -44,6 +46,7 @@ pub(crate) fn parse_args() -> CliOpts {
         print_usage(&program, &opts);
         exit(0);
     }
+    cli.logging = matches.opt_present("log");
 
     if let Some(val) = matches.opt_str("t") {
         cli.dark = match val.to_lowercase().as_str() {