Merge pull request 'bufferwriter' (#3) from bufferwriter into main

Reviewed-on: #3

src/xlsxtocsv.rs

@@ -1,3 +1,4 @@
+use std::io::{BufWriter, Write, stdout};
 use std::path::Path;
 use umya_spreadsheet::{Cell, Range, Worksheet, reader};
 
@@ -101,6 +102,9 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
         return Err(Error::new("Number of rows < number of rows to skip"));
     }
 
+    let stdout = stdout();
+    let mut writer = BufWriter::new(stdout.lock());
+    
     // for each row...
     let mut seq_row_num = 0;
     for i in (args.skip_rows+1)..=num_rows {
@@ -114,16 +118,18 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
                 }
                 None => {
                     seq_row_num += 1;
-                    number_row(&args.number_rows, args.separator, seq_row_num, i);
-                    print!("{}", empty_row);
+                    writer.write(number_row(&args.number_rows, args.separator, seq_row_num, i).as_bytes()).unwrap();
+                    writer.write(empty_row.as_bytes()).unwrap();
                     continue;
                 }
             }
         }
 
+        let mut line = String::from("");
+
         // number the row
         seq_row_num += 1;
-        number_row(&args.number_rows, args.separator, seq_row_num, i);
+        line += number_row(&args.number_rows, args.separator, seq_row_num, i).as_str();
 
         // for each column in row...
         let mut first = true;
@@ -135,7 +141,7 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
             if first {
                 first = false;
             } else {
-                print!("{}", args.separator);
+                line.push(args.separator);
             }
 
             let cell = match sheet.get_cell((j, i)) {
@@ -192,19 +198,20 @@ pub fn xlsxtocsv(args: &Arguments) -> Result<(), Error> {
                     ));
                 }
             }
-            print!("{}", value);
+            line += value.as_str();
         }
-        print!("{}", args.end_of_line);
+        line += args.end_of_line.as_str();
+        writer.write(line.as_bytes()).unwrap();
     }
 
     Ok(())
 }
 
-fn number_row(number_row: &NumberRows, separator: char, seqrownum: u32, i: u32) {
+fn number_row(number_row: &NumberRows, separator: char, seqrownum: u32, i: u32) -> String {
     match number_row {
-        NumberRows::AsIs => print!("{}{}", i, separator),
-        NumberRows::Sequential => print!("{}{}", seqrownum, separator),
-        NumberRows::None => {}
+        NumberRows::AsIs => format!("{}{}", i, separator),
+        NumberRows::Sequential => format!("{}{}", seqrownum, separator),
+        NumberRows::None => String::from(""),
     }
 }