print help with no arguments

src/cli/mod.rs

@@ -1,15 +1,10 @@
-
-
-
 use std::fmt::Display;
 
 use clap::{Parser, Subcommand, ValueEnum};
 
 #[derive(Parser, Debug)]
-#[command(author, version, about, long_about = None)]
+#[command(author, version, about, long_about = None, arg_required_else_help = true)]
 pub struct Cli {
-
-
     #[command(subcommand)]
     pub comm: Option<Subc>,
 
@@ -20,19 +15,20 @@ pub struct Cli {
 
 #[derive(Subcommand, Debug)]
 pub enum Subc {
-
-    Run {filename: String},
-    Build {filename: String, output: String},
-    View {
-
+    Run {
         filename: String,
-       
-        #[arg(short, long, default_value_t = FormatKind::FancyTable)]
-        format: FormatKind
-
     },
-    Debug {}
+    Build {
+        filename: String,
+        output: String,
+    },
+    View {
+        filename: String,
 
+        #[arg(short, long, default_value_t = FormatKind::FancyTable)]
+        format: FormatKind,
+    },
+    Debug {},
 }
 
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, ValueEnum, Debug)]
@@ -43,7 +39,6 @@ pub enum FormatKind {
     Serializable,
 }
 
-
 impl Display for FormatKind {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
@@ -54,5 +49,3 @@ impl Display for FormatKind {
         }
     }
 }
-
-