feat: output to file

src/args.rs

@@ -8,6 +8,7 @@ pub enum PlistFormat {
 pub struct ParsedArgs {
     pub in_file: String,
     pub format: PlistFormat,
+    pub out_file: Option<String>,
 }
 
 pub fn parse_args(matches: ArgMatches<'static>) -> ParsedArgs {
@@ -18,6 +19,7 @@ pub fn parse_args(matches: ArgMatches<'static>) -> ParsedArgs {
             Some("bin") | Some("binary") => PlistFormat::Binary,
             _ => failure_and_exit!("Plist format error."),
         },
+        out_file: matches.value_of("out").map(ToString::to_string),
     }
 }
 
@@ -30,6 +32,8 @@ pub fn get_args_matches() -> ArgMatches<'static> {
             .default_value("xml")
             .possible_values(&["xml", "binary", "bin"])
             .help("Output plist format")
-        ).arg(Arg::with_name("FILE").required(true).index(1).help("plist file name"))
+        )
+        .arg(Arg::with_name("out").short("o").long("out").takes_value(true).help("Output plist file"))
+        .arg(Arg::with_name("FILE").required(true).index(1).help("Input plist file name"))
         .get_matches()
 }