docs: add readme

Cargo.toml

@@ -2,6 +2,23 @@
 name = "from_file"
 version = "0.1.0"
 edition = "2024"
+authors = ["Kristofers Solo <dev@kristofers.xyz>"]
+description = "Procedural macro to derive configuration from files, with optional merging capabilities."
+repository = "https://github.com/kristoferssolo/from_file"
+documentation = "https://docs.rs/from_file"
+homepage = "https://github.com/kristoferssolo/from_file"
+license = "MIT OR Apache-2.0"
+keywords = [
+  "proc-macro",
+  "derive",
+  "configuration",
+  "file-parsing",
+  "defaults",
+  "merge",
+]
+categories = ["development-tools::procedural-macro", "parsing", "config"]
+exclude = ["/.github", "/.gitignore", "/tests", "*.png", "*.md"]
+readme = "README.md"
 
 [features]
 default = []
@@ -17,3 +34,8 @@ merge = { version = "0.2", optional = true }
 
 [lib]
 proc-macro = true
+
+[lints.clippy]
+pedantic = "warn"
+nursery = "warn"
+unwrap_used = "warn"

README.md

@@ -0,0 +1,63 @@
+# `from_file`
+
+Procedural macro to derive configuration from files, with optional merging capabilities.
+
+## Features
+
+- **Derive Configuration:** Easily load configuration from files into your Rust structs.
+- **Default Values:** Specify default values for struct fields using the `#[default = "..."]` attribute.
+- **Optional Merging:** When the `merge` feature is enabled, allows merging multiple configuration sources.
+
+## Usage
+
+```sh
+cargo add hexlab
+```
+
+Example:
+
+```rust
+use from_file::FromFile;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Clone, Default, Deserialize, Serialize, FromFile)]
+pub struct MyConfig {
+    pub host: String,
+    #[default = "8080"]
+    pub port: u16,
+    #[default = "false"]
+    pub enabled: bool,
+}
+
+fn main() {
+    // Simulate loading from a file (e.g., JSON, YAML)
+    let file_content = r#"
+        {
+            "host": "localhost"
+        }
+    "#;
+
+    let config_from_file: MyConfig = serde_json::from_str(file_content).unwrap();
+    let config = MyConfig::from_file(Some(config_from_file));
+
+    println!("Config: {:?}", config);
+    // Expected output: Config { host: "localhost", port: 8080, enabled: false }
+}
+```
+
+## Documentation
+
+Full documentation is available at [docs.rs](https://docs.rs/from_file).
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit a Pull Request.
+
+## License
+
+This project is dual-licensed under either:
+
+- MIT License ([LICENSE-MIT](LICENSE-MIT) or [http://opensource.org/licenses/MIT](http://opensource.org/licenses/MIT))
+- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or [http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0))
+
+at your option.

src/from_file.rs

@@ -1,8 +1,8 @@
-use proc_macro2::TokenStream;
+use proc_macro::TokenStream;
 use quote::{format_ident, quote};
 use syn::{
     Attribute, Data, DeriveInput, Error, Expr, Fields, GenericParam, Generics, Meta, Result,
-    parse_quote,
+    WherePredicate, parse_quote, parse2,
 };
 
 const WITH_MERGE: bool = cfg!(feature = "merge");
@@ -78,8 +78,11 @@ pub fn impl_from_file(input: &DeriveInput) -> Result<TokenStream> {
     } else {
         let mut where_clause = where_clause.cloned();
         if let Some(wc) = &mut where_clause {
-            wc.predicates
-                .extend(default_bounds.into_iter().map(|bound| parse_quote!(#bound)));
+            wc.predicates.extend(
+                default_bounds
+                    .into_iter()
+                    .map(|bound| parse2::<WherePredicate>(bound).unwrap()),
+            );
         } else {
             where_clause = Some(parse_quote!(where #(#default_bounds),*));
         }
@@ -117,8 +120,7 @@ pub fn impl_from_file(input: &DeriveInput) -> Result<TokenStream> {
                 Self::from_file(value)
             }
         }
-    }
-    .into())
+    }.into())
 }
 
 fn add_trait_bouts(mut generics: Generics) -> Generics {
@@ -136,9 +138,8 @@ fn parse_default_attr(attr: &Attribute) -> Result<Option<Expr>> {
     }
 
     let meta = attr.parse_args::<Meta>()?;
-    let name_value = match meta {
-        Meta::NameValue(nv) => nv,
-        _ => return Err(Error::new_spanned(attr, "Expected #[default = \"value\"]")),
+    let Meta::NameValue(name_value) = meta else {
+        return Err(Error::new_spanned(attr, "Expected #[default = \"value\"]"));
     };
 
     match name_value.value {

src/lib.rs

@@ -9,8 +9,5 @@ use syn::{DeriveInput, parse_macro_input};
 #[proc_macro_derive(FromFile, attributes(from_file))]
 pub fn derive_from_file(input: TokenStream) -> TokenStream {
     let inp = parse_macro_input!(input as DeriveInput);
-    match impl_from_file(&inp) {
-        Ok(ts) => ts.into(),
-        Err(e) => e.to_compile_error().into(),
-    }
+    impl_from_file(&inp).unwrap_or_else(|e| e.to_compile_error().into())
 }