add: recursive flag

src/main.rs

@@ -2,7 +2,7 @@ use std::env;
 use std::path::PathBuf;
 
 use clap::Parser;
-use typssg::compile_article;
+use typssg::{compile_article, compile_all};
 
 #[derive(Parser)]
 struct Args {
@@ -11,6 +11,9 @@ struct Args {
 
     #[arg(long)]
     prepend: Option<PathBuf>,
+
+    #[arg(short)]
+    recursive: bool,
 }
 
 fn main() {
@@ -21,7 +24,13 @@ fn main() {
 
     let args = Args::parse();
 
-    if let Err(e) = compile_article(&args.dir, &args.prepend) {
+    let result = if args.recursive {
+        compile_all(&args.dir, &args.prepend)
+    } else {
+        compile_article(&args.dir, &args.prepend)
+    };
+
+    if let Err(e) = result {
         eprintln!("{e}");
         std::process::exit(1);
     }