add opt.rs

src/opt.rs

@@ -0,0 +1,33 @@
+
+use argparse::{ArgumentParser, StoreTrue, Store};
+
+pub struct Options {
+    pub version: bool,
+    pub verbose: bool,
+    pub replace_file: bool,
+    pub tab_width: u16,
+    pub file: String,
+}
+
+impl Options {
+    pub fn new() -> Options {
+        Options {
+            version: false,
+            verbose: false,
+            replace_file: false,
+            tab_width: 4u16,
+            file: String::new(),
+        }
+    }
+
+    pub fn parse_args(&mut self) {
+        let mut ap = ArgumentParser::new();
+        ap.set_description("prettyjson - command line JSON pretty tool.");
+        ap.refer(&mut self.tab_width).add_option(&["-w", "--tab-width"], Store, "Tab width, default 4");
+        ap.refer(&mut self.version).add_option(&["-V", "--version"], StoreTrue, "Print version");
+        ap.refer(&mut self.verbose).add_option(&["-v", "--verbose"], StoreTrue, "Verbose");
+        ap.refer(&mut self.replace_file).add_option(&["-R", "--replace-file"], StoreTrue, "Replace file");
+        ap.refer(&mut self.file).add_argument("FILE", Store, "FILE");
+        ap.parse_args_or_exit();
+    }
+}