From 255bdf21a1f781ad79ce746cf0c320a6b90cd61f Mon Sep 17 00:00:00 2001
From: Noah Dietz <noahdietz@users.noreply.github.com>
Date: Fri, 18 Aug 2023 14:09:59 -0700
Subject: [PATCH] chore(ci): add new_client workflow (#8446)

---
 .github/workflows/new_client.yml            | 66 +++++++++++++++++++++
 internal/actions/cmd/changefinder/README.md |  2 +
 internal/actions/cmd/changefinder/main.go   | 13 +++-
 3 files changed, 80 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/new_client.yml

diff --git a/.github/workflows/new_client.yml b/.github/workflows/new_client.yml
new file mode 100644
index 000000000000..aaef46a0436a
--- /dev/null
+++ b/.github/workflows/new_client.yml
@@ -0,0 +1,66 @@
+---
+name: new_client
+on:
+  push:
+    # Per GitHub Action docs, specifying both branch and paths joins them with AND.
+    branches:
+      - main
+    paths:
+      - '**/version.go'
+  
+permissions:
+  contents: read
+  pull-requests: write
+
+jobs:
+  new_versions:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    - uses: actions/setup-go@v4
+        with:
+          go-version: 1.20.x
+    - name: Find new version files
+      id: versions
+      # Ignore changes to the internal and root directories.
+      # Focus on newly added version.go files generated by GAPIC.
+      # Multiple new version files in a single module file will be deduped.
+      run: |
+        dirs=$(go run ./internal/actions/cmd/changefinder -q --diff-filter=A --path-filter='*version.go' --content-regex='internal\.Version')
+        if [ -z "$dirs" ]
+        then
+          echo "skip=1" >> $GITHUB_OUTPUT
+          echo "No new version files!"
+        else
+          for d in $dirs; do list=${list},\"${d}\"; done
+          echo "new={\"new\":[${list#,}]}" >> $GITHUB_OUTPUT
+          echo "skip=" >> $GITHUB_OUTPUT
+        fi
+     outputs:
+        versions: ${{ steps.versions.outputs.new }}
+        skip: ${{ steps.versions.outputs.skip }}
+  bump_module:
+    needs: new_versions
+    runs-on: ubuntu-latest
+    if: "!needs.new_versions.outputs.skip"
+    continue-on-error: true
+    strategy:
+      matrix: ${{ fromJson(needs.new_versions.outputs.versions) }}
+    steps:
+    - uses: actions/checkout@v3
+    - run: echo >> ${{ matrix.new }}/CHANGES.md
+    - uses: googleapis/code-suggester@v4
+      id: code_suggester
+      env:
+        ACCESS_TOKEN: ${{ secrets.YOSHI_CODE_BOT_TOKEN }}  
+      with:
+        command: pr
+        upstream_owner: googleapis
+        upstream_repo: google-cloud-go
+        description: 'New client(s) generated in ${{ github.commits[0][url] }}, triggering release.'
+        title: 'feat(${{ matrix.new }}): new client(s)'
+        message: 'feat(${{ matrix.new }}): new clients'
+        primary: 'main'
+        branch: release-${{ matrix.new }}-client
+        git_dir: '.'
+        force: true
diff --git a/internal/actions/cmd/changefinder/README.md b/internal/actions/cmd/changefinder/README.md
index b17efdd14815..6cd43655d585 100644
--- a/internal/actions/cmd/changefinder/README.md
+++ b/internal/actions/cmd/changefinder/README.md
@@ -16,6 +16,8 @@ The available flags are as follows:
  format mode. Defaults to `submodules`.
  * `-base=[ref name]`: The base ref to compare `HEAD` to. Default is
  `origin/main`.
+ * `-path-filter=[path filter]`: The path filter to diff for.
+ * `-content-pattern=[regex]`: A regex to match on diff contents.
 
 Example usages from this repo root:
 
diff --git a/internal/actions/cmd/changefinder/main.go b/internal/actions/cmd/changefinder/main.go
index 50b8d48484e0..30d095f35cb8 100644
--- a/internal/actions/cmd/changefinder/main.go
+++ b/internal/actions/cmd/changefinder/main.go
@@ -32,7 +32,9 @@ var (
 	ghVarName = flag.String("gh-var", "submodules", "github format's variable name to set output for, defaults to 'submodules'.")
 	base      = flag.String("base", "origin/main", "the base ref to compare to, defaults to 'origin/main'")
 	// See https://git-scm.com/docs/git-diff#Documentation/git-diff.txt---diff-filterACDMRTUXB82308203
-	filter = flag.String("diff-filter", "", "the git diff filter to apply [A|C|D|M|R|T|U|X|B] - lowercase to exclude")
+	filter         = flag.String("diff-filter", "", "the git diff filter to apply [A|C|D|M|R|T|U|X|B] - lowercase to exclude")
+	pathFilter     = flag.String("path-filter", "", "filter commits by changes to target path(s)")
+	contentPattern = flag.String("content-regex", "", "regular expression to execute against contents of diff")
 )
 
 func main() {
@@ -134,9 +136,18 @@ func gitFilesChanges(dir string) ([]string, error) {
 	if *filter != "" {
 		args = append(args, "--diff-filter", *filter)
 	}
+	if *contentPattern != "" {
+		args = append(args, "-G", *contentPattern)
+	}
 	args = append(args, *base)
 
+	if *pathFilter != "" {
+		args = append(args, "--", *pathFilter)
+	}
+
 	c := exec.Command("git", args...)
+	logg.Printf(c.String())
+
 	c.Dir = dir
 	b, err := c.Output()
 	if err != nil {