hive-forge: rewrite bash CLI helper as a rust binary (closes #280)

hive-forge/src/verbs/branches.rs

@@ -0,0 +1,34 @@
+//! `branches [pattern] [repo]` — list branches, optionally filtered.
+
+use anyhow::Result;
+use clap::Args as ClapArgs;
+use serde_json::Value;
+
+use crate::client::Client;
+
+#[derive(ClapArgs)]
+pub struct Args {
+    /// Substring pattern to filter branch names.
+    pattern: Option<String>,
+    /// Repo override.
+    repo: Option<String>,
+}
+
+pub fn run(client: &Client, args: Args) -> Result<()> {
+    let repo = client.repo(args.repo.as_deref());
+    let v = client.get_json(&format!("/repos/{repo}/branches?limit=100"))?;
+    let names: Vec<&str> = v
+        .as_array()
+        .map(|a| {
+            a.iter()
+                .filter_map(|b| b.get("name").and_then(Value::as_str))
+                .collect()
+        })
+        .unwrap_or_default();
+    for n in names {
+        if args.pattern.as_deref().is_none_or(|p| n.contains(p)) {
+            println!("{n}");
+        }
+    }
+    Ok(())
+}