From 05a8fe9aacc2711222c2798a269ea1ad42ff3d3c Mon Sep 17 00:00:00 2001
From: kciesielski <kciesielski@users.noreply.github.com>
Date: Fri, 12 Jul 2024 09:13:43 +0200
Subject: [PATCH] Replace mergify with automerge action

---
 .github/labeler.yml      | 12 +++++++++
 .github/workflows/ci.yml | 38 ++++++++++++++++++++++++++++
 .mergify.yml             | 54 ----------------------------------------
 3 files changed, 50 insertions(+), 54 deletions(-)
 create mode 100644 .github/labeler.yml
 delete mode 100644 .mergify.yml

diff --git a/.github/labeler.yml b/.github/labeler.yml
new file mode 100644
index 00000000..4f1047b0
--- /dev/null
+++ b/.github/labeler.yml
@@ -0,0 +1,12 @@
+version: 1
+labels:
+  - label: "automerge"
+    authors: ["softwaremill-ci"]
+    files:
+      - "build.sbt"
+      - "project/plugins.sbt"
+  - label: "dependency"
+    authors: ["softwaremill-ci"]
+    files:
+      - "build.sbt"
+      - "project/plugins.sbt"
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2cc8c4d1..db931330 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -52,6 +52,44 @@ jobs:
       - name: Check MiMa # disable for major releases
         run: sbt -v core3/mimaReportBinaryIssues
 
+  # `automerge` label is attached iff there is exactly one file changed by steward and this file belongs to a
+  # whitelist specified by `labeler.yml`
+  label:
+    name: Attach automerge label
+    # only for PRs by softwaremill-ci
+    if: github.event.pull_request.user.login == 'softwaremill-ci'
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
+      # count number of files changed
+      - name: Count number of files changed
+        id: count-changed-files
+        run: |
+               N=$(git diff --name-only -r HEAD^1 HEAD | wc -w)
+               echo "changed_files_num=$N" >> $GITHUB_OUTPUT
+      - name: Launch labeler
+        # skip if more than one file changed
+        if: steps.count-changed-files.outputs.changed_files_num == 1
+        uses: srvaroa/labeler@master
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+
+  auto-merge:
+    name: Auto merge
+    # only for PRs by softwaremill-ci
+    if: github.event.pull_request.user.login == 'softwaremill-ci'
+    needs: [ ci, mima, label ]
+    runs-on: ubuntu-22.04
+    steps:
+      - id: automerge
+        name: automerge
+        uses: "pascalgn/automerge-action@v0.16.3"
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+          MERGE_METHOD: "squash"
+
   publish:
     name: Publish release
     needs: [ci]
diff --git a/.mergify.yml b/.mergify.yml
deleted file mode 100644
index 6074b01c..00000000
--- a/.mergify.yml
+++ /dev/null
@@ -1,54 +0,0 @@
-pull_request_rules:
-  - name: delete head branch after merge
-    conditions: []
-    actions:
-      delete_head_branch: {}
-  - name: automatic merge for softwaremill-ci pull requests affecting build.sbt
-    conditions:
-      - author=softwaremill-ci
-      - check-success=ci
-      - check-success=mima
-      - "#files=1"
-      - files=build.sbt
-    actions:
-      merge:
-        method: merge
-  - name: automatic merge for softwaremill-ci pull requests affecting project plugins.sbt
-    conditions:
-      - author=softwaremill-ci
-      - check-success=ci
-      - check-success=mima
-      - "#files=1"
-      - files=project/plugins.sbt
-    actions:
-      merge:
-        method: merge
-  - name: semi-automatic merge for softwaremill-ci pull requests
-    conditions:
-      - author=softwaremill-ci
-      - check-success=ci
-      - check-success=mima
-      - "#approved-reviews-by>=1"
-    actions:
-      merge:
-        method: merge
-  - name: automatic merge for softwaremill-ci pull requests affecting project build.properties
-    conditions:
-      - author=softwaremill-ci
-      - check-success=ci
-      - check-success=mima
-      - "#files=1"
-      - files=project/build.properties
-    actions:
-      merge:
-        method: merge
-  - name: automatic merge for softwaremill-ci pull requests affecting .scalafmt.conf
-    conditions:
-      - author=softwaremill-ci
-      - check-success=ci
-      - check-success=mima
-      - "#files=1"
-      - files=.scalafmt.conf
-    actions:
-      merge:
-        method: merge