feat: implement fetch pipeline and e2e coverage

src/lib.rs

@@ -1,3 +1,4 @@
+use std::env;
 use std::path::Path;
 
 use clap::Parser;
@@ -11,6 +12,8 @@ pub mod output;
 pub mod render;
 
 use crate::cli::{Cli, Commands, OutputFormat};
+use crate::gitea::client::GiteaClient;
+use crate::normalize::normalize_bundle;
 use crate::output::write_output;
 use crate::render::json::{parse_json, render_json};
 use crate::render::markdown::render_markdown;
@@ -25,11 +28,27 @@ pub fn run() -> anyhow::Result<()> {
             let md = render_markdown(&doc);
             write_output(args.out.as_deref().map(Path::new), &md)?;
         }
-        Commands::Fetch(_args) => {
-            let _ = OutputFormat::Markdown;
-            let _ = render_json;
+        Commands::Fetch(args) => {
+            let token = required_env("GITEA_PR_CLI_API_TOKEN")?;
+            let base_url = required_env("GITEA_PR_CLI_URL")?;
+            let repo = required_env("GITEA_PR_CLI_REPO")?;
+
+            let client = GiteaClient::new(base_url, token);
+            let bundle = client.fetch_pr_bundle(&repo, args.pr_index)?;
+            let doc = normalize_bundle(&repo, bundle);
+
+            let rendered = match args.format {
+                OutputFormat::Markdown => render_markdown(&doc),
+                OutputFormat::Json => render_json(&doc)?,
+            };
+
+            write_output(args.out.as_deref().map(Path::new), &rendered)?;
         }
     }
 
     Ok(())
 }
+
+fn required_env(name: &'static str) -> anyhow::Result<String> {
+    env::var(name).map_err(|_| anyhow::anyhow!("missing required environment variable: {name}"))
+}