add opt.rs

src/opt.rs

@@ -0,0 +1,37 @@
+use rust_util::XResult;
+use argparse::{ArgumentParser, StoreTrue, Store, List};
+
+pub struct Options {
+    pub version: bool,
+    pub algorithm: String,
+    pub file_name_list: Vec<String>,
+}
+
+impl Options {
+    pub fn new() -> Options {
+        Options {
+            version: false,
+            algorithm: "SHA256".to_string(),
+            file_name_list: Vec::new(),
+        }
+    }
+
+    pub fn parse_args(&mut self) -> XResult<()> {
+        {
+            let mut ap = ArgumentParser::new();
+            ap.set_description("digest - command line digest tool.");
+            ap.refer(&mut self.algorithm).add_option(&["-a", "--algorithm"], Store, "Algorithm, e.g. SHA256, SM3");
+            ap.refer(&mut self.version).add_option(&["-v", "--version"], StoreTrue, "Print version");
+            ap.refer(&mut self.file_name_list).add_argument("File names", List, "File names to be digested");
+            ap.parse_args_or_exit();
+        }
+        
+        Ok(())
+    }
+
+    pub fn new_and_parse_args() -> XResult<Options> {
+        let mut options = Options::new();
+        options.parse_args()?;
+        Ok(options)
+    }
+}