feat: new-sheet command

src/book/mod.rs

@@ -83,6 +83,14 @@ impl Book {
         Ok(())
     }
 
+    pub fn new_sheet(&mut self, sheet_name: Option<&str>) -> Result<()> {
+        let (_, idx) = self.model.new_sheet();
+        if let Some(name) = sheet_name {
+            self.set_sheet_name(idx as usize, name)?;
+        }
+        Ok(())
+    }
+
     /// Get the sheet data for the current worksheet.
     pub fn get_sheet_data(&self) -> Result<&SheetData> {
         Ok(&self.get_sheet()?.sheet_data)

src/ui/cmd.rs

@@ -8,6 +8,7 @@ pub enum Cmd<'a> {
     InsertRow(usize),
     InsertColumns(usize),
     RenameSheet(Option<usize>, &'a str),
+    NewSheet(Option<&'a str>),
     Edit(&'a str),
     Help(Option<&'a str>),
     Quit,
@@ -20,6 +21,9 @@ pub fn parse<'cmd, 'i: 'cmd>(input: &'i str) -> Result<Option<Cmd<'cmd>>, &'stat
     if let Some(cmd) = try_consume_write(cursor.clone())? {
         return Ok(Some(cmd));
     }
+    if let Some(cmd) = try_consume_new_sheet(cursor.clone())? {
+        return Ok(Some(cmd));
+    }
     // try consume insert-row command.
     if let Some(cmd) = try_consume_insert_row(cursor.clone())? {
         return Ok(Some(cmd));
@@ -89,6 +93,28 @@ fn try_consume_write<'cmd, 'i: 'cmd>(
     })));
 }
 
+fn try_consume_new_sheet<'cmd, 'i: 'cmd>(
+    mut input: StrCursor<'i>,
+) -> Result<Option<Cmd<'cmd>>, &'static str> {
+    const LONG: &'static str = "new-sheet";
+
+    if compare(input.clone(), LONG) {
+        input.seek(LONG.len());
+    } else {
+        return Ok(None);
+    }
+    if input.remaining() > 0 && !is_ws(&mut input) {
+        return Err("Invalid command: Did you mean to type `write <arg>`?");
+    }
+    let arg = input.span(0..).trim();
+    return Ok(Some(Cmd::NewSheet(if arg.is_empty() {
+        None
+    } else {
+        Some(arg)
+    })));
+}
+
+
 fn try_consume_insert_row<'cmd, 'i: 'cmd>(
     mut input: StrCursor<'i>,
 ) -> Result<Option<Cmd<'cmd>>, &'static str> {

src/ui/mod.rs

@@ -289,6 +289,10 @@ impl<'ws> Workspace<'ws> {
                 }
                 Ok(true)
             }
+            Ok(Some(Cmd::NewSheet(name))) => {
+                self.book.new_sheet(name)?;
+                Ok(true)
+            }
             Ok(Some(Cmd::Quit)) => {
                 // TODO(zaphar): We probably need to do better than this
                 std::process::exit(0);