From 3de8722f63477ba6c8ecae3ae24f457df303b1dd Mon Sep 17 00:00:00 2001
From: Osama Ahmad <osama199915@gmail.com>
Date: Thu, 2 Nov 2023 07:18:26 +0200
Subject: [PATCH] Error when no source files are input

---
 src/main.rs                    | 10 ++++++++--
 src/{ => utils}/compilation.rs |  0
 src/utils/mod.rs               |  1 +
 3 files changed, 9 insertions(+), 2 deletions(-)
 rename src/{ => utils}/compilation.rs (100%)

diff --git a/src/main.rs b/src/main.rs
index 84e245e..9e02f66 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,10 +1,10 @@
 mod code_generation;
-mod compilation;
 mod lexical_analysis;
 mod syntax_analysis;
 mod utils;
 
 use clap::Parser;
+use crate::utils::compilation;
 
 #[derive(Parser, Debug)]
 #[clap(about, long_about = None)]
@@ -34,11 +34,17 @@ fn main() {
         + args.exe_filename.is_some() as usize;
 
     if exclusive_args_count > 1 {
-        panic!("Cannot specify more than one option from [-l, -c, -s, -o] at one time");
+        eprintln!("Error: cannot specify more than one option from [-l, -c, -s, -o] at one time");
+        return;
     } else if exclusive_args_count == 0 {
         args.exe_filename = Some("a.out".to_string());
     }
 
+    if args.input_source_files.is_empty() {
+        eprintln!("Error: at least one source file has to be provided");
+        return;
+    }
+
     let compilation = compilation::Compilation::new();
     for filename in &args.input_source_files {
         let source = std::fs::read_to_string(&filename).unwrap();
diff --git a/src/compilation.rs b/src/utils/compilation.rs
similarity index 100%
rename from src/compilation.rs
rename to src/utils/compilation.rs
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 681d26e..e7224c1 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -1 +1,2 @@
 pub mod test_utils;
+pub mod compilation;