Move default Options into impl Default in library

CHANGELOG.md

@@ -1,6 +1,7 @@
-**Version 0.6.1 (unreleased)**
+**Version 0.7.0 (unreleased)**
  - Minor compression improvement on interlaced images
  - Performance optimizations
+ - [SEMVER_MINOR] Move default Options into a Default impl
 
 **Version 0.6.0**
  - Fix issue where output directory would not be created if it did not exist

src/lib.rs

@@ -81,6 +81,50 @@ pub struct Options {
     pub use_heuristics: bool,
 }
 
+impl Default for Options {
+    fn default() -> Options {
+        // Default settings based on -o 2 from the CLI interface
+        let mut filter = HashSet::new();
+        filter.insert(0);
+        filter.insert(5);
+        let mut compression = HashSet::new();
+        compression.insert(9);
+        let mut memory = HashSet::new();
+        memory.insert(9);
+        let mut strategies = HashSet::new();
+        for i in 0..4 {
+            strategies.insert(i);
+        }
+
+        Options {
+            backup: false,
+            out_file: PathBuf::new(),
+            out_dir: None,
+            stdout: false,
+            pretend: false,
+            recursive: false,
+            fix_errors: false,
+            clobber: true,
+            create: true,
+            force: false,
+            preserve_attrs: false,
+            verbosity: Some(0),
+            filter: filter,
+            interlace: None,
+            compression: compression,
+            memory: memory,
+            strategies: strategies,
+            window: 15,
+            bit_depth_reduction: true,
+            color_type_reduction: true,
+            palette_reduction: true,
+            idat_recoding: true,
+            strip: png::Headers::None,
+            use_heuristics: false,
+        }
+    }
+}
+
 /// Perform optimization on the input file using the options provided
 pub fn optimize(filepath: &Path, opts: &Options) -> Result<(), String> {
     type TrialWithData = (u8, u8, u8, u8, Vec<u8>);

src/main.rs

@@ -13,45 +13,6 @@ use std::path::PathBuf;
 const VERSION_STRING: &'static str = "0.6.0";
 
 fn main() {
-    let mut filter = HashSet::new();
-    filter.insert(0);
-    filter.insert(5);
-    let mut compression = HashSet::new();
-    compression.insert(9);
-    let mut memory = HashSet::new();
-    memory.insert(9);
-    let mut strategies = HashSet::new();
-    for i in 0..4 {
-        strategies.insert(i);
-    }
-
-    let default_opts = oxipng::Options {
-        backup: false,
-        out_file: PathBuf::new(),
-        out_dir: None,
-        stdout: false,
-        pretend: false,
-        recursive: false,
-        fix_errors: false,
-        clobber: true,
-        create: true,
-        force: false,
-        preserve_attrs: false,
-        verbosity: Some(0),
-        filter: filter,
-        interlace: None,
-        compression: compression,
-        memory: memory,
-        strategies: strategies,
-        window: 15,
-        bit_depth_reduction: true,
-        color_type_reduction: true,
-        palette_reduction: true,
-        idat_recoding: true,
-        strip: png::Headers::None,
-        use_heuristics: false,
-    };
-
     let matches =
         App::new("oxipng")
             .version(VERSION_STRING)
@@ -228,7 +189,7 @@ fn main() {
     regardless of the order you write the arguments.")
             .get_matches();
 
-    let mut opts = default_opts;
+    let mut opts = oxipng::Options::default();
 
     match parse_opts_into_struct(&matches, &mut opts) {
         Ok(_) => (),