Bring over dev/inode pair changes from bootandy's repo

src/main.rs

@@ -10,7 +10,7 @@ use clap::{App, AppSettings, Arg};
 static DEFAULT_NUMBER_OF_LINES: &'static str = "15";
 
 fn main() {
-    let options = App::new("Trailing args example")
+    let options = App::new("Dust")
         .setting(AppSettings::TrailingVarArg)
         .arg(
             Arg::with_name("number_of_lines")
@@ -19,6 +19,11 @@ fn main() {
                 .takes_value(true)
                 .default_value(DEFAULT_NUMBER_OF_LINES),
         )
+        .arg(
+            Arg::with_name("use_apparent_size")
+                .short("s")
+                .help("If set will use file length. Otherwise we use blocks"),
+        )
         .arg(Arg::with_name("inputs").multiple(true))
         .get_matches();
 
@@ -29,8 +34,9 @@ fn main() {
         }
     };
     let number_of_lines = value_t!(options.value_of("number_of_lines"), usize).unwrap();
+    let use_apparent_size = options.is_present("use_apparent_size");
 
-    let (permissions, results) = get_dir_tree(&filenames);
+    let (permissions, results) = get_dir_tree(&filenames, use_apparent_size);
     let slice_it = find_big_ones(&results, number_of_lines);
     display(permissions, &slice_it);
 }