diff --git a/Cargo.lock b/Cargo.lock
index 5d300d1..0165d09 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -658,6 +658,15 @@ version = "0.9.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c2459377285ad874054d797f3ccebf984978aa39129f6eafde5cdc8315b612f8"
 
+[[package]]
+name = "convert_case"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec182b0ca2f35d8fc196cf3404988fd8b8c739a4d270ff118a398feb0cbec1ca"
+dependencies = [
+ "unicode-segmentation",
+]
+
 [[package]]
 name = "cookie"
 version = "0.17.0"
@@ -2701,6 +2710,13 @@ dependencies = [
  "tokio",
 ]
 
+[[package]]
+name = "kifu-l10n"
+version = "0.1.0"
+dependencies = [
+ "messages-codegen",
+]
+
 [[package]]
 name = "kv-log-macro"
 version = "1.0.7"
@@ -2904,6 +2920,13 @@ dependencies = [
 [[package]]
 name = "messages-codegen"
 version = "0.1.0"
+dependencies = [
+ "convert_case",
+ "quote",
+ "serde 1.0.193",
+ "serde_yaml",
+ "syn 2.0.48",
+]
 
 [[package]]
 name = "mime"
@@ -4160,6 +4183,19 @@ dependencies = [
  "serde 1.0.193",
 ]
 
+[[package]]
+name = "serde_yaml"
+version = "0.9.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a15e0ef66bf939a7c890a0bf6d5a733c70202225f9888a89ed5c62298b019129"
+dependencies = [
+ "indexmap",
+ "itoa",
+ "ryu",
+ "serde 1.0.193",
+ "unsafe-libyaml",
+]
+
 [[package]]
 name = "sgf"
 version = "0.1.0"
@@ -5087,6 +5123,12 @@ dependencies = [
  "traitobject",
 ]
 
+[[package]]
+name = "unsafe-libyaml"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab4c90930b95a82d00dc9e9ac071b4991924390d46cbd0dfe566148667605e4b"
+
 [[package]]
 name = "url"
 version = "1.7.2"
diff --git a/Cargo.toml b/Cargo.toml
index d4565b7..a23b4e6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,7 @@ members = [
     "ifc",
     "kifu/core",
     "kifu/gtk",
+    "kifu/l10n",
     "l10n",
     "memorycache",
     "messages-codegen",
diff --git a/messages-codegen/Cargo.toml b/messages-codegen/Cargo.toml
index 426f5d7..c62ac76 100644
--- a/messages-codegen/Cargo.toml
+++ b/messages-codegen/Cargo.toml
@@ -5,4 +5,12 @@ edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
+[lib]
+proc-macro = true
+
 [dependencies]
+convert_case    = { version = "0.6" }
+quote           = { version = "*" }
+syn             = { version = "*" }
+serde_yaml      = { version = "*" }
+serde           = { version = "*", features = [ "derive" ] }
diff --git a/messages-codegen/src/lib.rs b/messages-codegen/src/lib.rs
index 6e5422d..cb17e37 100644
--- a/messages-codegen/src/lib.rs
+++ b/messages-codegen/src/lib.rs
@@ -9,6 +9,47 @@
  * For overall file structure, I want the messages, L10N, and FluentErgo tied together.
  */
 
+use proc_macro::TokenStream;
+use quote::quote;
+use syn;
+
+/* I want to write a macro that reads something like this:
+ * messages! {
+ *     Welcome(name: String) => "Hello, ${name}",
+ *     GamesInDatabase(count: usize) => "{$count ->
+ *     [one] There is one game in the database
+ *     *[other] There are ${count} games in the database
+ * }",
+ *
+ * It generates an enumeration with all of the named values (Welcome, GamesInDatabase), it
+ * generates corresponding structures (Welcome{ name: String }, GamesInDatabase{ count: usize }),
+ * and it generates two implementations. One is an implementation that can be used to write all of
+ * the strings after => into a file. The other is an implementation that can be imported into a
+ * program, but which *does not* contain the strings. That would look more like this:
+ *
+ * messages.rs:
+ *
+ * enum Messages {
+ *   Welcome(Welcome),
+ *   GamesInDatabase(GamesInDatabase),
+ * }
+ *
+ * struct Welcome{ name: String }
+ * struct GamesInDatabase{ count: usize }
+ *
+ * message_strings.ftl:
+ *
+ * welcome = "Hello, ${name}",
+ * games-in-database = "{$count ->
+ *     [one] There is one game in the database
+ *     *[other] There are ${count} games in the database
+ * }",
+ *
+ * messages.rs can be imported into the resulting program, and the names of the strings are thus a
+ * part of the program, but the strings themselves are still data files.
+ */
+
+/*
 #[macro_export]
 macro_rules! messages {
     ($($name:ident($($arg:ident: $argtype:ty)*) => $message:literal,)+) => {
@@ -29,25 +70,18 @@ macro_rules! messages {
         })+
     }
 }
+*/
 
-#[cfg(test)]
-mod test {
-    use super::*;
+#[proc_macro_derive(Messages)]
+pub fn messages_macro(input: TokenStream) -> TokenStream {
+    let syn::DeriveInput { ident, .. } = syn::parse_macro_input! {input};
 
-    messages! {
-        Welcome(name: String) => "Hello, ${name}",
-        GamesInDatabase(count: usize) => "{$count ->
-    [one] There is one game in the database
-    *[other] There are ${count} games in the database
-}",
-    }
-
-    #[test]
-    fn it_can_generate_an_ftl() {
-        for s in Messages::gen_strings() {
-            println!("{}", s);
+    let gen = quote! {
+        impl Messages for #ident {
+            fn hello() {
+                println!("Hello from {}", stringify!(#ident));
+            }
         }
-
-        assert!(false);
-    }
+    };
+    gen.into()
 }
diff --git a/messages-codegen/src/main.rs b/messages-codegen/src/main.rs
new file mode 100644
index 0000000..f41b3af
--- /dev/null
+++ b/messages-codegen/src/main.rs
@@ -0,0 +1,135 @@
+use convert_case::{Case, Casing};
+use serde::Deserialize;
+use serde_yaml;
+use std::{collections::HashMap, fmt, fs::File};
+
+#[derive(Debug, Clone, Deserialize)]
+struct MessageJS {
+    #[serde(default)]
+    parameters: HashMap<String, String>,
+    content: String,
+}
+
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+enum Ty {
+    String,
+    Number,
+    Count,
+}
+
+impl fmt::Display for Ty {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
+        match self {
+            Ty::String => write!(f, "String")?,
+            Ty::Number => write!(f, "i32")?,
+            Ty::Count => write!(f, "usize")?,
+        }
+        Ok(())
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Eq)]
+struct Parameter {
+    name: String,
+    ty: Ty,
+}
+
+impl From<&str> for Parameter {
+    fn from(val: &str) -> Self {
+        Self {
+            name: "Nothing".to_owned(),
+            ty: Ty::String,
+        }
+    }
+}
+
+impl From<(String, String)> for Parameter {
+    fn from((name, val): (String, String)) -> Self {
+        let ty = match val.as_ref() {
+            "string" => Ty::String,
+            "number" => Ty::Number,
+            "count" => Ty::Count,
+            _ => panic!("invalid value"),
+        };
+        Self { name, ty }
+    }
+}
+
+#[derive(Debug, Clone)]
+struct Message {
+    name: String,
+    parameters: Vec<Parameter>,
+    content: String,
+}
+
+impl Message {
+    fn from_js(name: String, source: MessageJS) -> Self {
+        Self {
+            name,
+            parameters: source
+                .parameters
+                .into_iter()
+                .map(|param| Parameter::from(param))
+                .collect(),
+            content: source.content,
+        }
+    }
+
+    fn rust_code(&self) -> String {
+        if self.parameters.is_empty() {
+            format!(r"pub struct {}; ", self.name.to_case(Case::Pascal))
+        } else {
+            let mut struct_strs = vec![];
+
+            struct_strs.push(format!("pub struct {} {{", self.name.to_case(Case::Pascal)));
+            let mut parameters: Vec<String> = self
+                .parameters
+                .iter()
+                .map(|param| format!("    {}: {},", param.name, param.ty))
+                .collect();
+
+            struct_strs.append(&mut parameters);
+            struct_strs.push("}".to_owned());
+            struct_strs.push("".to_owned());
+
+            struct_strs.push(format!(
+                "impl Message for {} {{",
+                self.name.to_case(Case::Pascal)
+            ));
+            struct_strs.push(format!("    pub fn localize(&self, bundle: &FluentBundle) -> String {{"));
+            struct_strs.push("        let mut args = FluentArgs::new();".to_owned());
+            let mut parameters: Vec<String> = self
+                .parameters
+                .iter()
+                .map(|param| format!("        args.set(\"{}\", self.{})", param.name, param.name))
+                .collect();
+            struct_strs.append(&mut parameters);
+            struct_strs.push("".to_owned());
+            struct_strs.push(format!("        let msg = bundle.get_message(\"{}\").unwrap();", self.name));
+            struct_strs.push(format!("        let mut errors = vec![]"));
+            struct_strs.push(format!("        msg.format_pattern(&msg.value().unwrap(), args, &mut errors)"));
+            struct_strs.push("    }".to_owned());
+            struct_strs.push("}".to_owned());
+
+            struct_strs.join("\n")
+        }
+    }
+
+    fn content(&self) -> String {
+        format!("{} = {}", self.name, self.content.clone())
+    }
+}
+
+fn main() {
+    let messages: HashMap<String, MessageJS> =
+        serde_yaml::from_reader(File::open("test-data/messages.yaml").unwrap()).unwrap();
+
+    let messages = messages
+        .into_iter()
+        .map(|(name, msg)| Message::from_js(name, msg));
+    for message in messages {
+        println!();
+        println!("{}", message.rust_code());
+        // println!("{}", message.content());
+    }
+}
diff --git a/messages-codegen/test-data/messages.yaml b/messages-codegen/test-data/messages.yaml
new file mode 100644
index 0000000..3b67f31
--- /dev/null
+++ b/messages-codegen/test-data/messages.yaml
@@ -0,0 +1,14 @@
+welcome:
+  content: "Welcome to Kifu"
+hello:
+  parameters:
+    name: string
+  content: "Hello, ${name}"
+games-in-database:
+  parameters:
+    count: count
+  content: |
+    {$count ->
+      [one] There is one game in the database
+      *[other] There are ${count} games in the database
+    }