From c3c4116dc0153734ba1f1323f92e35dd4c943f0f Mon Sep 17 00:00:00 2001
From: Daisuke Maki <lestrrat+github@gmail.com>
Date: Tue, 17 Feb 2026 18:03:46 +0900
Subject: [PATCH] Check for generated files

---
 .github/workflows/ci.yml                      | 31 +++++++++++++++++++
 hub/paging.go                                 |  2 +-
 ...e_string.go => paging_request_type_gen.go} |  2 +-
 peco.go                                       |  2 +-
 stringer_vertical_anchor.go                   | 17 ----------
 vertical_anchor_gen.go                        | 25 +++++++++++++++
 6 files changed, 59 insertions(+), 20 deletions(-)
 rename hub/{pagingrequesttype_string.go => paging_request_type_gen.go} (90%)
 delete mode 100644 stringer_vertical_anchor.go
 create mode 100644 vertical_anchor_gen.go

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e13607e..f38ee33 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,3 +29,34 @@ jobs:
         run: make test
       - name: Build all targets
         run: make all
+
+  generate:
+    runs-on: ubuntu-latest
+    name: Check generated code
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - name: Cache Go modules
+        uses: actions/cache@cdf6c1fa76f9f475f3d7449005a359c84ca0f306 # v5.0.3
+        with:
+          path: |
+            ~/go/pkg/mod
+            ~/.cache/go-build
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
+      - name: Setup Go
+        uses: actions/setup-go@7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5 # v6.2.0
+        with:
+          go-version: stable
+          check-latest: true
+      - name: Install stringer
+        run: go install golang.org/x/tools/cmd/stringer@latest
+      - name: Run go generate
+        run: go generate ./...
+      - name: Check for uncommitted changes
+        run: |
+          if ! git diff --exit-code; then
+            echo "::error::Generated code is out of date. Run 'go generate ./...' and commit the result."
+            exit 1
+          fi
diff --git a/hub/paging.go b/hub/paging.go
index a7e2c22..d7d4702 100644
--- a/hub/paging.go
+++ b/hub/paging.go
@@ -1,4 +1,4 @@
-//go:generate stringer -type PagingRequestType
+//go:generate stringer -type PagingRequestType -output paging_request_type_gen.go
 
 package hub
 
diff --git a/hub/pagingrequesttype_string.go b/hub/paging_request_type_gen.go
similarity index 90%
rename from hub/pagingrequesttype_string.go
rename to hub/paging_request_type_gen.go
index ca7f7af..91c86cc 100644
--- a/hub/pagingrequesttype_string.go
+++ b/hub/paging_request_type_gen.go
@@ -1,4 +1,4 @@
-// Code generated by "stringer -type PagingRequestType"; DO NOT EDIT.
+// Code generated by "stringer -type PagingRequestType -output paging_request_type_gen.go"; DO NOT EDIT.
 
 package hub
 
diff --git a/peco.go b/peco.go
index 9f1133f..571888e 100644
--- a/peco.go
+++ b/peco.go
@@ -1,4 +1,4 @@
-//go:generate stringer -type VerticalAnchor -output stringer_vertical_anchor.go .
+//go:generate stringer -type VerticalAnchor -output vertical_anchor_gen.go .
 
 package peco
 
diff --git a/stringer_vertical_anchor.go b/stringer_vertical_anchor.go
deleted file mode 100644
index 74986d9..0000000
--- a/stringer_vertical_anchor.go
+++ /dev/null
@@ -1,17 +0,0 @@
-// Code generated by "stringer -type VerticalAnchor -output stringer_vertical_anchor.go ."; DO NOT EDIT.
-
-package peco
-
-import "fmt"
-
-const _VerticalAnchor_name = "AnchorTopAnchorBottom"
-
-var _VerticalAnchor_index = [...]uint8{0, 9, 21}
-
-func (i VerticalAnchor) String() string {
-	i -= 1
-	if i < 0 || i >= VerticalAnchor(len(_VerticalAnchor_index)-1) {
-		return fmt.Sprintf("VerticalAnchor(%d)", i+1)
-	}
-	return _VerticalAnchor_name[_VerticalAnchor_index[i]:_VerticalAnchor_index[i+1]]
-}
diff --git a/vertical_anchor_gen.go b/vertical_anchor_gen.go
new file mode 100644
index 0000000..ee34e78
--- /dev/null
+++ b/vertical_anchor_gen.go
@@ -0,0 +1,25 @@
+// Code generated by "stringer -type VerticalAnchor -output vertical_anchor_gen.go ."; DO NOT EDIT.
+
+package peco
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[AnchorTop-1]
+	_ = x[AnchorBottom-2]
+}
+
+const _VerticalAnchor_name = "AnchorTopAnchorBottom"
+
+var _VerticalAnchor_index = [...]uint8{0, 9, 21}
+
+func (i VerticalAnchor) String() string {
+	idx := int(i) - 1
+	if i < 1 || idx >= len(_VerticalAnchor_index)-1 {
+		return "VerticalAnchor(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _VerticalAnchor_name[_VerticalAnchor_index[idx]:_VerticalAnchor_index[idx+1]]
+}