Remove flags::process

It was doing two independent things:
- print help and exit
- set log level

It's better to do those explicitly in main.rs

src/flags.rs

@@ -2,11 +2,9 @@
 use getopts::Options;
 use libc::c_int;
 use libdeno;
-use log;
 use std::ffi::CStr;
 use std::ffi::CString;
 use std::mem;
-use std::process::exit;
 use std::vec::Vec;
 
 // Creates vector of strings, Vec<String>
@@ -28,20 +26,6 @@ pub struct DenoFlags {
   pub types_flag: bool,
 }
 
-pub fn process(flags: &DenoFlags, usage_string: &str) {
-  if flags.help {
-    println!("{}", &usage_string);
-    exit(0);
-  }
-
-  let log_level = if flags.log_debug {
-    log::LevelFilter::Debug
-  } else {
-    log::LevelFilter::Info
-  };
-  log::set_max_level(log_level);
-}
-
 pub fn get_usage(opts: &Options) -> String {
   format!(
     "Usage: deno script.ts {}

src/main.rs

@@ -81,8 +81,19 @@ fn main() {
       eprintln!("{}", err);
       std::process::exit(1)
     });
+
+  if flags.help {
+    println!("{}", &usage_string);
+    std::process::exit(0);
+  }
+
+  log::set_max_level(if flags.log_debug {
+    log::LevelFilter::Debug
+  } else {
+    log::LevelFilter::Info
+  });
+
   let mut isolate = isolate::Isolate::new(flags, rest_argv, ops::dispatch);
-  flags::process(&isolate.state.flags, &usage_string);
   tokio_util::init(|| {
     isolate
       .execute("deno_main.js", "denoMain();")