Move entrypoint from src/bin.rs to src/main.rs

src/main.rs

@@ -0,0 +1,75 @@
+use std::{env, panic, process};
+
+use backtrace::Backtrace;
+use structopt::StructOpt;
+
+use librojo::cli::Options;
+
+fn main() {
+    panic::set_hook(Box::new(|panic_info| {
+        // PanicInfo's payload is usually a &'static str or String.
+        // See: https://doc.rust-lang.org/beta/std/panic/struct.PanicInfo.html#method.payload
+        let message = match panic_info.payload().downcast_ref::<&str>() {
+            Some(&message) => message.to_string(),
+            None => match panic_info.payload().downcast_ref::<String>() {
+                Some(message) => message.clone(),
+                None => "<no message>".to_string(),
+            },
+        };
+
+        log::error!("Rojo crashed!");
+        log::error!("This is probably a Rojo bug.");
+        log::error!("");
+        log::error!(
+            "Please consider filing an issue: {}/issues",
+            env!("CARGO_PKG_REPOSITORY")
+        );
+        log::error!("");
+        log::error!("Details: {}", message);
+
+        if let Some(location) = panic_info.location() {
+            log::error!("in file {} on line {}", location.file(), location.line());
+        }
+
+        // When using the backtrace crate, we need to check the RUST_BACKTRACE
+        // environment variable ourselves. Once we switch to the (currently
+        // unstable) std::backtrace module, we won't need to do this anymore.
+        let should_backtrace = env::var("RUST_BACKTRACE")
+            .map(|var| var == "1")
+            .unwrap_or(false);
+
+        if should_backtrace {
+            eprintln!("{:?}", Backtrace::new());
+        } else {
+            eprintln!(
+                "note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace."
+            );
+        }
+
+        process::exit(1);
+    }));
+
+    let options = Options::from_args();
+
+    let log_filter = match options.global.verbosity {
+        0 => "info",
+        1 => "info,librojo=debug",
+        2 => "info,librojo=trace",
+        _ => "trace",
+    };
+
+    let log_env = env_logger::Env::default().default_filter_or(log_filter);
+
+    env_logger::Builder::from_env(log_env)
+        .format_module_path(false)
+        .format_timestamp(None)
+        // Indent following lines equal to the log level label, like `[ERROR] `
+        .format_indent(Some(8))
+        .write_style(options.global.color.into())
+        .init();
+
+    if let Err(err) = options.run() {
+        log::error!("{:?}", err);
+        process::exit(1);
+    }
+}