Move multi-module-span.go to cmd/prchecker

Makefile

@@ -72,6 +72,11 @@ $(MYGOBIN)/pluginator:
 	cd cmd/pluginator; \
 	go install .
 
+# Build from local source.
+$(MYGOBIN)/prchecker:
+	cd cmd/prchecker; \
+	go install .
+
 # Build from local source.
 $(MYGOBIN)/kustomize:
 	cd kustomize; \
@@ -79,12 +84,13 @@ $(MYGOBIN)/kustomize:
 
 .PHONY: install-tools
 install-tools: \
+	$(MYGOBIN)/gh \
 	$(MYGOBIN)/goimports \
 	$(MYGOBIN)/golangci-lint-kustomize \
-	$(MYGOBIN)/gh \
 	$(MYGOBIN)/gorepomod \
 	$(MYGOBIN)/mdrip \
 	$(MYGOBIN)/pluginator \
+	$(MYGOBIN)/prchecker \
 	$(MYGOBIN)/stringer
 
 ### Begin kustomize plugin rules.

cmd/prchecker/go.mod

@@ -0,0 +1,8 @@
+module sigs.k8s.io/kustomize/cmd/prchecker
+
+go 1.15
+
+require (
+	github.com/google/go-github v17.0.0+incompatible
+	github.com/google/go-querystring v1.0.0 // indirect
+)

cmd/prchecker/go.sum

@@ -0,0 +1,4 @@
+github.com/google/go-github v17.0.0+incompatible h1:N0LgJ1j65A7kfXrZnUDaYCs/Sf4rEjNlfyDHW9dolSY=
+github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
+github.com/google/go-querystring v1.0.0 h1:Xkwi/a1rcvNg1PPYe5vI8GbeBY/jrVuDX5ASuANWTrk=
+github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=

cmd/prchecker/main.go

@@ -1,12 +1,16 @@
-// multi-module-span script:
+// prchecker examines pull requests
-// A script which can detect when a pull request would make changes which
-// span a series of restricted directories (ex: multiple go modules or projects)
 //
-// When a pull request includes files which span two modules the script will
+// - When a PR includes files from multiple modules that we'd rather not
-// exit with a non-zero exit code.
+//   modify at the same time (in an effort to  have more self-contained
+//   release notes), the script will exit with a non-zero exit code.
 //
-// Running:
+// Usage:
-// go run multi-module-span.go -owner=kubernetes-sigs -repo=kustomize -pr=2997 cmd/config  api/ kustomize/ kyaml/
+//
+//    go run . \
+//      -owner=kubernetes-sigs \
+//      -repo=kustomize \
+//      -pr=2997 \
+//     cmd/config api kustomize kyaml
 
 package main