Check for errors before proceeding.

src/lib.rs

@@ -1,14 +1,3 @@
-pub fn add(left: usize, right: usize) -> usize {
- left + right
-}
-
-#[cfg(test)]
-mod tests {
- use super::*;
-
- #[test]
- fn it_works() {
- let result = add(2, 2);
- assert_eq!(result, 4);
- }
+pub mod error_codes {
+ pub const ERROR_SCHEMA_INVALID: i32 = 1;
 }

src/main.rs

@@ -4,13 +4,26 @@ fn main() {
  // Get the schema file from the command line arguments or use the default.
  let default_schema_file = "schema.graphql".to_string();
  let schema_file = &std::env::args().nth(1).unwrap_or(default_schema_file);
-
  println!("schema_file: {}", schema_file);
 
  // Read the schema file and parse it into a schema object.
- let schema_file = std::fs::read_to_string(schema_file).unwrap();
+ let result = std::fs::read_to_string(schema_file);
+ if result.is_err() {
+ println!("Error reading schema file: {}", result.err().unwrap());
+ std::process::exit(error_codes::ERROR_SCHEMA_FILE_INVALID);
+ }
+
+ let schema_file = result.unwrap();
+ let result = parse_schema::<String>(&schema_file);
+ if result.is_err() {
+ println!("Error parsing schema file: {}", result.err().unwrap());
+ std::process::exit(minigraf::error_codes::ERROR_SCHEMA_INVALID);
+ }
 
- let ast = parse_schema::<String>(&schema_file).unwrap().to_owned();
+ let schema = result.unwrap();
+ println!("schema: {:#?}", schema);
+}
 
- println!("{:#?}", ast);
+mod error_codes {
+ pub const ERROR_SCHEMA_FILE_INVALID: i32 = 0x10000;
 }