Triagebot: merge-conflicts

Author: ehuss

src/SUMMARY.md

@@ -24,6 +24,7 @@
     - [Labeling](./triagebot/labeling.md)
     - [Major Changes](./triagebot/major-changes.md)
     - [Mentions](./triagebot/mentions.md)
+    - [Merge Conflicts](./triagebot/merge-conflicts.md)
     - [No Merge Policy](./triagebot/no-merge.md)
     - [Nominate](./triagebot/nominate.md)
     - [Note](./triagebot/note.md)

src/triagebot/merge-conflicts.md

@@ -0,0 +1,38 @@
+# Merge Conflicts
+
+The `merge-conflicts` feature detects if a Pull Request has a merge conflict, and will post a comment asking the author to resolve the conflicts.
+
+## Usage
+
+This is triggered automatically when a commit is made to a branch that causes existing, open PRs to have a merge conflict. The bot will post a comment to the PR that roughly looks like this:
+
+> ☔ The latest upstream changes (possibly #152) made this pull request unmergeable. Please [resolve the merge conflicts](https://rustc-dev-guide.rust-lang.org/git.html#rebasing-and-conflicts).
+
+Note that it may take a minute or so for the comments to be posted.
+
+## Configuration
+
+This feature is enabled on a repository by having a `[merge-conflicts]` table in `triagebot.toml`:
+
+```toml
+[merge-conflicts]
+```
+
+There are several optional keys that you can include:
+
+- `remove` --- A list of labels to remove from the PR when a conflict is detected.
+- `add` --- A list of labels to add to the PR when a conflict is detected.
+- `unless` --- A list of labels that, if already present on the PR, will prevent triagebot from adding or removing labels.
+
+## Example
+
+```toml
+[merge-conflicts]
+remove = ['S-waiting-on-bors']
+add = ['S-waiting-on-author']
+unless = ['S-blocked', 'S-waiting-on-crater', 'S-waiting-on-team', 'S-waiting-on-review']
+```
+
+## Implementation
+
+See [`src/handlers/merge_conflicts.rs`](https://github.com/rust-lang/triagebot/blob/HEAD/src/handlers/merge_conflicts.rs).