feat: add --scratch command line parameter

src/main.zig

@@ -72,6 +72,7 @@ pub fn main() anyerror!void {
             .syntax_report_timing = "Report syntax highlighting time",
             .exec = "Execute a command on startup",
             .literal = "Disable :LINE and +LINE syntax",
+            .scratch = "Open a scratch (temporary) buffer on start",
             .version = "Show build version and exit",
         };
 
@@ -85,6 +86,7 @@ pub fn main() anyerror!void {
             .language = 'l',
             .exec = 'e',
             .literal = 'L',
+            .scratch = 'S',
             .version = 'v',
         };
 
@@ -106,6 +108,7 @@ pub fn main() anyerror!void {
         syntax_report_timing: bool,
         exec: ?[]const u8,
         literal: bool,
+        scratch: bool,
         version: bool,
     };
 
@@ -316,6 +319,10 @@ pub fn main() anyerror!void {
         try tui_proc.send(.{ "cmd", "show_home" });
     }
 
+    if (args.scratch) {
+        try tui_proc.send(.{ "cmd", "create_scratch_buffer", .{} });
+    }
+
     if (args.exec) |exec_str| {
         var cmds = std.mem.splitScalar(u8, exec_str, ';');
         while (cmds.next()) |cmd| try tui_proc.send(.{ "cmd", cmd, .{} });