an agent gets one todo when its pr starts conflicting with the target branch

swarm-controller/src/forge/base_pulls.rs

@@ -0,0 +1,42 @@
+//! The open pull requests that target one branch.
+
+use anyhow::{Context, Result};
+use forgejo_api::structs::{
+    PullRequest, RepoListPullRequestsQuery, RepoListPullRequestsQueryState,
+};
+
+use super::Client;
+
+impl Client {
+    /// Every open pull request in `owner/repo` whose target branch is `base`,
+    /// as the forge lists them: one call per page of 50.
+    ///
+    /// # Errors
+    ///
+    /// The forge refused or did not answer.
+    pub async fn open_pulls_on(
+        &self,
+        owner: &str,
+        repo: &str,
+        base: &str,
+    ) -> Result<Vec<PullRequest>> {
+        let query = RepoListPullRequestsQuery {
+            state: Some(RepoListPullRequestsQueryState::Open),
+            sort: None,
+            milestone: None,
+            labels: None,
+            poster: None,
+            base: Some(base.to_owned()),
+            head: None,
+        };
+        self.api
+            .call(|api| {
+                Box::pin(
+                    api.repo_list_pull_requests(owner, repo, query.clone())
+                        .all(),
+                )
+            })
+            .await
+            .with_context(|| format!("list open pull requests on {base} in {owner}/{repo}"))
+    }
+}