code: strinto

strinto/.gitignore

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+/target

strinto/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.78"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2422ad645d89c99f8f3e6b88a9fdeca7fabeac836b1002371c4367c8f984aae"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.35"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "291ec9ab5efd934aaf503a6466c5d5251535d108ee747472c3977cc5acc868ef"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "strinto"
+version = "0.1.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.48"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f3531638e407dfc0814761abb7c00a5b54992b849452a0646b7f65c9f770f3f"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"

strinto/Cargo.toml

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+[package]
+name = "strinto"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+proc-macro = true
+
+[dependencies]
+syn = { version = "2.0", features = ["full"] }
+quote = "1.0"
+
+[dev-dependencies]
+proc-macro2 = "1.0"

strinto/src/lib.rs

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+extern crate proc_macro;
+use proc_macro::TokenStream;
+use quote::quote;
+use syn::{parse_macro_input, Expr, ExprStruct};
+
+/// # literal strings in a struct insantiation are converted .into().
+///
+/// ```rust
+/// use strinto::strinto;
+///    #[derive(Debug)]
+///    struct TestStruct {
+///        name: String,
+///        title: String,
+///        description: String,
+///        age: usize,
+///    }
+///
+///    let descr = "description";
+///
+///    let output = strinto!(TestStruct {
+///        name: "John", // Literal string.
+///        title: String::from("Wicked"),
+///        description: descr.to_string(),
+///        age: 30,
+///    });
+///
+///    let output_string = format!("{:?}", output);
+///    assert_eq!(
+///        output_string,
+///        "TestStruct { name: \"John\", title: \"Wicked\", description: \"description\", age: 30 }"
+///    );
+/// ```
+
+#[proc_macro]
+pub fn strinto(input: TokenStream) -> TokenStream {
+    let expr_struct = parse_macro_input!(input as ExprStruct);
+
+    // Extract struct name and fields
+    let struct_name = &expr_struct.path;
+    let fields = expr_struct.fields.iter().map(|field| {
+        let field_name = field.member.clone();
+        let field_value = &field.expr;
+        // Determine if the field value is a string literal and transform it
+        if let Expr::Lit(expr_lit) = field_value {
+            if let syn::Lit::Str(_) = expr_lit.lit {
+                quote! { #field_name: #field_value.into() }
+            } else {
+                quote! { #field_name: #field_value }
+            }
+        } else {
+            quote! { #field_name: #field_value }
+        }
+    });
+
+    let expanded = quote! {
+        #struct_name {
+            #(#fields,)*
+        }
+    };
+
+    expanded.into()
+}