Clean up command line arguments.

src/cli.rs

@@ -0,0 +1,30 @@
+use clap::Parser;
+use std::path::PathBuf;
+
+#[derive(Debug, Parser)]
+#[clap(author, version, about)]
+pub struct Args {
+    /// Path to fallback meta file.
+    #[arg(value_hint = clap::ValueHint::DirPath, required = true)]
+    pub fallback_meta: PathBuf,
+
+    #[clap(flatten)]
+    pub single_or_batch: SingleOrBatch,
+}
+
+#[derive(Debug, Parser)]
+#[group(required = true, multiple = false)]
+pub struct SingleOrBatch {
+    /// Path to a single meta to process.
+    #[arg(short = 'i', long, value_hint = clap::ValueHint::DirPath)]
+    pub single_meta: Option<PathBuf>,
+
+    /// Path to blog root for batch processing.
+    #[arg(
+        short,
+        long,
+        value_hint = clap::ValueHint::DirPath,
+        default_value = format!("../test_tree/")
+    )]
+    pub blog_path: Option<PathBuf>,
+}

src/main.rs

@@ -1,37 +1,23 @@
+use clap::Parser;
 mod blog;
+mod cli;
 mod error;
 mod og;
 
-use clap::Parser;
-use std::path::PathBuf;
-
 use crate::blog::Meta;
 
-#[derive(Debug, Parser)]
-#[clap(author, version, about)]
-struct Args {
-    /// Path to blog root.
-    #[arg(
-        short = 'i',
-        long,
-        value_hint = clap::ValueHint::DirPath,
-        default_value = format!("../test_tree/")
-    )]
-    blog_path: PathBuf,
-
-    #[arg(short, long, value_hint = clap::ValueHint::DirPath)]
-    fallback_meta: PathBuf,
-
-    #[arg(short, long, value_hint = clap::ValueHint::DirPath)]
-    single_meta: PathBuf,
-}
-
 fn main() {
-    let config = Args::parse();
+    let config = cli::Args::parse();
 
     blog::FALLBACK_META_PATH.get_or_init(|| config.fallback_meta);
 
-    let _meta = Meta::try_from(config.single_meta).expect("Failed to deserialize single_meta file");
+    let _meta = Meta::try_from(
+        config
+            .single_or_batch
+            .single_meta
+            .expect("No patch for single file processing."),
+    )
+    .expect("Failed to deserialize single_meta file");
 
     println!("Loaded FallbackMeta");
 }