UPDATE: have xlsx_2_icalc specify its output name

This is nice for deployments

xlsx/src/bin/xlsx_2_icalc.rs

@@ -7,7 +7,7 @@
 //! This is primary for QA internal testing and will be superseded by an official
 //! IronCalc CLI.
 //!
-//! Usage: test file.xlsx
+//! Usage: test file.xlsx [output.icalc]
 
 use std::path;
 
@@ -15,15 +15,20 @@ use ironcalc::{export::save_to_icalc, import::load_from_xlsx};
 
 fn main() {
     let args: Vec<_> = std::env::args().collect();
-    if args.len() != 2 {
-        panic!("Usage: {} <file.xlsx>", args[0]);
+    if args.len() != 2 && args.len() != 3 {
+        panic!("Usage: {} <file.xlsx> [output.icalc]", args[0]);
     }
     // first test the file
     let file_name = &args[1];
 
+    let output_file_name = if args.len() == 3 {
+        &args[2]
+    } else {
         let file_path = path::Path::new(file_name);
     let base_name = file_path.file_stem().unwrap().to_str().unwrap();
-    let output_file_name = &format!("{base_name}.ic");
+        &format!("{base_name}.ic")
+    };
+
     let model = load_from_xlsx(file_name, "en", "UTC").unwrap();
     save_to_icalc(&model, output_file_name).unwrap();
 }