wip: feat: method to save sheet rows to csv file

Cargo.toml

@@ -9,7 +9,6 @@ edition = "2021"
 anyhow = { version = "1.0.91", features = ["backtrace"] }
 clap = { version = "4.5.20", features = ["derive"] }
 crossterm = { version = "0.28.1", features = ["event-stream", "serde"] }
-csvx = "0.1.17"
 # this revision introduces a way to get the Model back out of the UserModel
 ironcalc = { git = "https://github.com/ironcalc/IronCalc" }
 futures = "0.3.31"
@@ -21,3 +20,4 @@ slice-utils = { git = "https://dev.zaphar.net/zaphar/slice-cursor-rs.git" }
 serde_json = "1.0.133"
 colorsys = "0.6.7"
 tui-markdown = { version = "0.3.1", features = [] }
+csv = "1.3.1"

src/book/mod.rs

@@ -119,12 +119,23 @@ impl Book {
         )?))
     }
 
+    pub fn csv_for_sheet<W>(&self, sheet: u32, sink: W) -> Result<()>
+        where W: std::io::Write,
+    {
+        let rows = self.get_export_rows_for_sheet(sheet)?;
+        let mut writer = csv::Writer::from_writer(sink);
+        for row in rows {
+            writer.write_record(row)?;
+        }
+        Ok(())
+    }
+
     pub fn get_export_rows(&self) -> Result<Vec<Vec<String>>> {
         let sheet = self.location.sheet;
-        Ok(self.export_rows_for_sheet(sheet)?)
+        Ok(self.get_export_rows_for_sheet(sheet)?)
     }
 
-    pub fn export_rows_for_sheet(&self, sheet: u32) -> Result<Vec<Vec<String>>, anyhow::Error> {
+    pub fn get_export_rows_for_sheet(&self, sheet: u32) -> Result<Vec<Vec<String>>, anyhow::Error> {
         let worksheet = self
             .model
             .get_model()
@@ -170,6 +181,15 @@ impl Book {
         Ok(Self::from_model(load_from_xlsx(path, locale, tz)?))
     }
 
+    /// Save a sheet in the book to a csv file
+    pub fn save_sheet_to_csv(&self, sheet: u32, path: &str) -> Result<()> {
+        let file_path = std::path::Path::new(path);
+        let file = std::fs::File::create(file_path)?;
+        let writer = std::io::BufWriter::new(file);
+        self.csv_for_sheet(sheet, writer)?;
+        Ok(())
+    }
+
     /// Save book to an xlsx file.
     pub fn save_to_xlsx(&mut self, path: &str) -> Result<()> {
         // TODO(zaphar): Currently overwrites. Should we prompt in this case?