feat: add render-md json input flow

src/lib.rs

@@ -1,9 +1,33 @@
+use std::path::Path;
+
+use clap::Parser;
+
 pub mod cli;
 pub mod error;
 pub mod model;
 pub mod output;
 pub mod render;
 
+use crate::cli::{Cli, Commands, OutputFormat};
+use crate::output::write_output;
+use crate::render::json::{parse_json, render_json};
+use crate::render::markdown::render_markdown;
+
 pub fn run() -> anyhow::Result<()> {
+    let cli = Cli::parse();
+
+    match cli.command {
+        Commands::RenderMd(args) => {
+            let raw = std::fs::read_to_string(&args.input)?;
+            let doc = parse_json(&raw)?;
+            let md = render_markdown(&doc);
+            write_output(args.out.as_deref().map(Path::new), &md)?;
+        }
+        Commands::Fetch(_args) => {
+            let _ = OutputFormat::Markdown;
+            let _ = render_json;
+        }
+    }
+
     Ok(())
 }

src/render/json.rs

@@ -0,0 +1,9 @@
+use crate::model::PrReviewDocument;
+
+pub fn render_json(doc: &PrReviewDocument) -> anyhow::Result<String> {
+    Ok(serde_json::to_string_pretty(doc)?)
+}
+
+pub fn parse_json(input: &str) -> anyhow::Result<PrReviewDocument> {
+    Ok(serde_json::from_str(input)?)
+}

src/render/mod.rs

@@ -1 +1,2 @@
+pub mod json;
 pub mod markdown;