Hide no-merge comments once merge commits removed

src/github.rs

@@ -391,6 +391,8 @@ impl ZulipGitHubReference {
 
 #[derive(Debug, serde::Deserialize)]
 pub struct Comment {
+    pub id: u64,
+    pub node_id: String,
     #[serde(deserialize_with = "opt_string")]
     pub body: String,
     pub html_url: String,
@@ -403,6 +405,17 @@ pub struct Comment {
     pub pr_review_state: Option<PullRequestReviewState>,
 }
 
+#[derive(Debug, serde::Deserialize, serde::Serialize, Eq, PartialEq)]
+#[serde(rename_all = "SCREAMING_SNAKE_CASE")]
+pub enum ReportedContentClassifiers {
+    Abuse,
+    Duplicate,
+    OffTopic,
+    Outdated,
+    Resolved,
+    Spam,
+}
+
 #[derive(Debug, serde::Deserialize, Eq, PartialEq)]
 #[serde(rename_all = "snake_case")]
 pub enum PullRequestReviewState {
@@ -581,24 +594,24 @@ impl Issue {
         client: &GithubClient,
         id: u64,
         new_body: &str,
-    ) -> anyhow::Result<()> {
+    ) -> anyhow::Result<Comment> {
         let comment_url = format!("{}/issues/comments/{}", self.repository().url(client), id);
         #[derive(serde::Serialize)]
         struct NewComment<'a> {
             body: &'a str,
         }
-        client
-            .send_req(
+        let comment = client
+            .json(
                 client
                     .patch(&comment_url)
                     .json(&NewComment { body: new_body }),
             )
             .await
             .context("failed to edit comment")?;
-        Ok(())
+        Ok(comment)
     }
 
-    pub async fn post_comment(&self, client: &GithubClient, body: &str) -> anyhow::Result<()> {
+    pub async fn post_comment(&self, client: &GithubClient, body: &str) -> anyhow::Result<Comment> {
         #[derive(serde::Serialize)]
         struct PostComment<'a> {
             body: &'a str,
@@ -608,10 +621,32 @@ impl Issue {
             .strip_prefix("https://api.github.com")
             .expect("expected api host");
         let comments_url = format!("{}{comments_path}", client.api_url);
-        client
-            .send_req(client.post(&comments_url).json(&PostComment { body }))
+        let comment = client
+            .json(client.post(&comments_url).json(&PostComment { body }))
             .await
             .context("failed to post comment")?;
+        Ok(comment)
+    }
+
+    pub async fn hide_comment(
+        &self,
+        client: &GithubClient,
+        node_id: &str,
+        reason: ReportedContentClassifiers,
+    ) -> anyhow::Result<()> {
+        client
+            .graphql_query(
+                "mutation($node_id: ID!, $reason: ReportedContentClassifiers!) {
+                    minimizeComment(input: {subjectId: $node_id, classifier: $reason}) {
+                        __typename
+                    }
+                }",
+                serde_json::json!({
+                    "node_id": node_id,
+                    "reason": reason,
+                }),
+            )
+            .await?;
         Ok(())
     }
 

src/handlers/no_merges.rs

@@ -4,7 +4,7 @@
 use crate::{
     config::NoMergesConfig,
     db::issue_data::IssueData,
-    github::{IssuesAction, IssuesEvent, Label},
+    github::{IssuesAction, IssuesEvent, Label, ReportedContentClassifiers},
     handlers::Context,
 };
 use anyhow::Context as _;
@@ -24,6 +24,9 @@ pub(super) struct NoMergesInput {
 struct NoMergesState {
     /// Hashes of merge commits that have already been mentioned by triagebot in a comment.
     mentioned_merge_commits: HashSet<String>,
+    /// List of all the no_merge comments as GitHub GraphQL NodeId.
+    #[serde(default)]
+    no_merge_comments: Vec<String>,
     /// Labels that the bot added as part of the no-merges check.
     #[serde(default)]
     added_labels: Vec<String>,
@@ -124,10 +127,22 @@ pub(super) async fn handle_input(
                 .context("failed to remove label")?;
         }
 
-        // FIXME: Minimize prior no_merges comments.
+        // Minimize prior no_merges comments.
+        for node_id in state.data.no_merge_comments.iter() {
+            event
+                .issue
+                .hide_comment(
+                    &ctx.github,
+                    node_id.as_str(),
+                    ReportedContentClassifiers::Resolved,
+                )
+                .await
+                .context("failed to hide previous merge commit comment")?;
+        }
 
         // Clear from state.
         state.data.mentioned_merge_commits.clear();
+        state.data.no_merge_comments.clear();
         state.data.added_labels.clear();
         state.save().await?;
         return Ok(());
@@ -202,11 +217,13 @@ pub(super) async fn handle_input(
             .context("failed to set no_merges labels")?;
 
         // Post comment
-        event
+        let comment = event
             .issue
             .post_comment(&ctx.github, &message)
             .await
             .context("failed to post no_merges comment")?;
+
+        state.data.no_merge_comments.push(comment.node_id);
         state.save().await?;
     }
     Ok(())

src/interactions.rs

@@ -26,7 +26,8 @@ impl<'a> ErrorComment<'a> {
             "Please file an issue on GitHub at [triagebot](https://github.com/rust-lang/triagebot) if there's \
             a problem with this bot, or reach out on [#t-infra](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra) on Zulip."
         )?;
-        self.issue.post_comment(client, &body).await
+        self.issue.post_comment(client, &body).await?;
+        Ok(())
     }
 }
 
@@ -45,7 +46,8 @@ impl<'a> PingComment<'a> {
         for user in self.users {
             write!(body, "@{} ", user)?;
         }
-        self.issue.post_comment(client, &body).await
+        self.issue.post_comment(client, &body).await?;
+        Ok(())
     }
 }