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

hive-forge/src/verbs/assign.rs

@@ -0,0 +1,58 @@
+//! `assign <number> <user> [--remove]` — add or remove a user from an
+//! issue/PR's assignee list. Forgejo has no dedicated POST endpoint —
+//! we read the current list, mutate, and PATCH the issue back (closes
+//! #353's "no such endpoint" trap; matches the bash helper's logic).
+
+use anyhow::Result;
+use clap::Args as ClapArgs;
+use serde_json::{Value, json};
+
+use crate::client::Client;
+use crate::verbs::print_json;
+
+#[derive(ClapArgs)]
+pub struct Args {
+    /// Issue or PR number.
+    number: u64,
+    /// User login to assign (or unassign with `--remove`).
+    user: String,
+    /// Remove the user instead of adding.
+    #[arg(long)]
+    remove: bool,
+}
+
+pub fn run(client: &Client, args: Args) -> Result<()> {
+    let repo = client.repo(None);
+    let current = client.get_json(&format!("/repos/{repo}/issues/{}", args.number))?;
+    let mut assignees: Vec<String> = current
+        .get("assignees")
+        .and_then(Value::as_array)
+        .map(|a| {
+            a.iter()
+                .filter_map(|u| u.get("login").and_then(Value::as_str).map(str::to_owned))
+                .collect()
+        })
+        .unwrap_or_default();
+    if args.remove {
+        assignees.retain(|u| u != &args.user);
+    } else if !assignees.contains(&args.user) {
+        assignees.push(args.user.clone());
+    }
+    let resp = client.patch_json(
+        &format!("/repos/{repo}/issues/{}", args.number),
+        &json!({ "assignees": assignees }),
+    )?;
+    let logins: Vec<&str> = resp
+        .get("assignees")
+        .and_then(Value::as_array)
+        .map(|a| {
+            a.iter()
+                .filter_map(|u| u.get("login").and_then(Value::as_str))
+                .collect()
+        })
+        .unwrap_or_default();
+    print_json(&json!({
+        "number": resp.get("number"),
+        "assignees": logins,
+    }))
+}