sdk-builder: main function does stuff

sdk-builder/Cargo.toml

@@ -15,3 +15,4 @@ unreal-sdk = {path = "../unreal-sdk"}
 
 quote = "1.0.28"
 proc-macro2 = "1.0.60"
+clap = { version = "4.3.9", features = ["derive"] }

sdk-builder/src/main.rs

@@ -1,9 +1,50 @@
-use std::{borrow::Cow, collections::BTreeMap};
+use std::{borrow::Cow, collections::BTreeMap, path::PathBuf};
 
-use unreal_sdk::sdk::repr::ObjectRef;
+use clap::{Args, Parser, Subcommand};
+use unreal_sdk::sdk::repr::{ObjectRef, Sdk};
 
-fn main() {
+use crate::rust::Builder;
+
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+pub struct Cli {
+    #[command(subcommand)]
+    commands: Option<Commands>,
+}
+
+#[derive(Args)]
+pub struct Build {
+    #[arg(short, long)]
+    in_archive: PathBuf,
+    /// directory into which the sdk will be dumped.
+    #[arg(short, long)]
+    out: Option<PathBuf>,
+    #[arg(short, long, default_value = "false")]
+    single_file: bool,
+    #[arg(short, long, default_value = "true")]
+    feature_gate: bool,
+}
+
+#[derive(Subcommand)]
+pub enum Commands {
+    Build(Build),
+}
+
+fn main() -> anyhow::Result<()> {
     println!("Hello, world!");
+
+    let cli = Cli::parse();
+
+    if let Some(Commands::Build(build)) = &cli.commands {
+        let sdk = Sdk::from_path_ron(&build.in_archive)?;
+        let builder = Builder::new(sdk);
+
+        let path = build.out.clone().unwrap_or(std::env::current_dir()?);
+
+        builder.build_in_dir(path, build)?;
+    }
+
+    Ok(())
 }
 
 struct SplitResult<'a> {
@@ -97,9 +138,10 @@ pub struct CanonicalNames {
 }
 
 pub mod rust {
-    use std::{borrow::Cow, collections::BTreeMap};
+    use std::{borrow::Cow, collections::BTreeMap, path::Path};
 
     use anyhow::Context;
+    use itertools::Itertools;
     use proc_macro2::TokenStream;
     use quote::{format_ident, quote};
     use unreal_sdk::sdk::repr::{
@@ -170,11 +212,18 @@ pub mod rust {
         }
 
         /// returns the absolute path of a type with the assumption that all
-        /// packages are children of the path `::crate::sdk`
+        /// packages are children of the path `crate::sdk`
+        fn get_type_package_path(&self, key: &ObjectRef) -> Option<String> {
+            let pkg = &self.sdk.packages.get(&key.package)?.name;
+            Some(format!("crate::sdk::{pkg}"))
+        }
+
+        /// returns the absolute path of a type with the assumption that all
+        /// packages are children of the path `crate::sdk`
         fn get_type_path(&self, key: &ObjectRef) -> Option<String> {
             let pkg = &self.sdk.packages.get(&key.package)?.name;
             self.get_type_name(key)
-                .map(|name| format!("::crate::sdk::{pkg}::{name}"))
+                .map(|name| format!("crate::sdk::{pkg}::{name}"))
         }
 
         /// returns the precached, prefixed and cannonicalized (for this
@@ -201,11 +250,52 @@ pub mod rust {
             }
         }
 
-        pub fn build(self) -> anyhow::Result<()> {
+        pub fn build(self, args: &super::Build) -> anyhow::Result<BTreeMap<String, TokenStream>> {
-            for pkg in self.sdk.packages.values() {
+            let packages = self
-                self.generate_package(pkg)?;
+                .sdk
+                .packages
+                .values()
+                .map(|pkg| {
+                    let name = pkg.name.clone();
+                    let tokens = self.generate_package(pkg, args.feature_gate)?;
+
+                    anyhow::Ok((name, tokens))
+                })
+                .collect::<Result<BTreeMap<_, _>, _>>()?;
+
+            Ok(packages)
         }
 
+        pub fn build_in_dir<P: AsRef<Path>>(
+            self,
+            path: P,
+            args: &super::Build,
+        ) -> anyhow::Result<()> {
+            let packages = self.build(args)?;
+
+            let path = path.as_ref();
+            std::fs::create_dir_all(&path)?;
+
+            let mut mod_rs = TokenStream::new();
+
+            for (name, tokens) in packages {
+                if args.single_file {
+                    mod_rs.extend(quote! {
+                        pub mod #name {
+                            #tokens
+                        }
+                    });
+                } else {
+                    std::fs::write(path.join(format!("{name}.rs")), tokens.to_string())?;
+
+                    mod_rs.extend(quote! {
+                        pub mod #name;
+                    });
+                }
+            }
+
+            std::fs::write(path.join("mod.rs"), mod_rs.to_string())?;
+
             Ok(())
         }