derive Error for PrintfError

Author: tjol

COPYING

@@ -1,4 +1,4 @@
-Copyright (c) 2021 Thomas Jollans
+Copyright (c) 2021-2024 Thomas Jollans
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

Cargo.toml

@@ -12,6 +12,7 @@ categories = ["template-engine", "wasm"]
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+thiserror = "1.0.57"
 
 [dev-dependencies]
 libc = "0.2"

src/lib.rs

@@ -20,25 +20,31 @@
 //! The types of the arguments are checked at runtime.
 //!
 
+use thiserror::Error;
+
 mod format;
 pub mod parser;
 
 pub use format::Printf;
-
 use parser::{parse_format_string, ConversionType, FormatElement, NumericParam};
 
 /// Error type
-#[derive(Debug, Clone, Copy)]
+#[derive(Debug, Clone, Copy, Error)]
 pub enum PrintfError {
     /// Error parsing the format string
+    #[error("Error parsing the format string")]
     ParseError,
     /// Incorrect type passed as an argument
+    #[error("Incorrect type passed as an argument")]
     WrongType,
     /// Too many arguments passed
+    #[error("Too many arguments passed")]
     TooManyArgs,
     /// Too few arguments passed
+    #[error("Too few arguments passed")]
     NotEnoughArgs,
     /// Other error (should never happen)
+    #[error("Other error (should never happen)")]
     Unknown,
 }
 

src/parser.rs

@@ -76,7 +76,6 @@ pub enum ConversionType {
     PercentSign,
 }
 
-
 /// Parses a string to a vector of [FormatElement]
 ///
 /// Takes a printf-style format string `fmt`