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()
 }

src/main.rs

@@ -7,6 +7,7 @@ mod args;
 use plist::Value;
 use crate::utils::print_bytes;
 use crate::args::PlistFormat;
+use std::fs::File;
 
 fn main() {
     let matches = args::get_args_matches();
@@ -15,14 +16,32 @@ fn main() {
     let plist_value = Value::from_file(&parsed_args.in_file).unwrap_or_else(|e| {
         failure_and_exit!("Read plist file: {}, failed: {}", parsed_args.in_file, e);
     });
-    let mut buf = vec![];
-    match parsed_args.format {
-        PlistFormat::Xml => if let Err(e) = plist_value.to_writer_xml(&mut buf) {
-            failure_and_exit!("Write plist failed: {}", e);
+    if let Some(out_file) = parsed_args.out_file {
+        if File::open(&out_file).is_ok() {
+            failure_and_exit!("Output file exits: {}", out_file);
         }
-        PlistFormat::Binary => if let Err(e) = plist_value.to_writer_binary(&mut buf) {
-            failure_and_exit!("Write plist failed: {}", e);
+        match parsed_args.format {
+            PlistFormat::Xml => if let Err(e) = plist_value.to_file_xml(&out_file) {
+                failure_and_exit!("Write xml plist file failed: {}", e);
+            } else {
+                success!("Write xml plist file: {} success", out_file);
+            }
+            PlistFormat::Binary => if let Err(e) = plist_value.to_file_binary(&out_file) {
+                failure_and_exit!("Write binary plist file failed: {}", e);
+            } else {
+                success!("Write binary plist file: {} success", out_file);
+            }
         }
+    } else {
+        let mut buf = vec![];
+        match parsed_args.format {
+            PlistFormat::Xml => if let Err(e) = plist_value.to_writer_xml(&mut buf) {
+                failure_and_exit!("Write xml plist failed: {}", e);
+            }
+            PlistFormat::Binary => if let Err(e) = plist_value.to_writer_binary(&mut buf) {
+                failure_and_exit!("Write binary plist failed: {}", e);
+            }
+        }
+        print_bytes(&buf);
     }
-    print_bytes(&buf);
 }