Add tag filter regex.

check_command.go

@@ -31,6 +31,11 @@ func (c *CheckCommand) Run(request CheckRequest) ([]Version, error) {
 
 	var filteredReleases []*github.RepositoryRelease
 
+	versionParser, err := newVersionParser(request.Source.TagFilter)
+	if err != nil {
+		return []Version{}, err
+	}
+
 	for _, release := range releases {
 		if request.Source.Drafts != *release.Draft {
 			continue
@@ -46,14 +51,26 @@ func (c *CheckCommand) Run(request CheckRequest) ([]Version, error) {
 		if release.TagName == nil {
 			continue
 		}
-		if _, err := version.NewVersionFromString(determineVersionFromTag(*release.TagName)); err != nil {
+		if _, err := version.NewVersionFromString(versionParser.parse(*release.TagName)); err != nil {
 			continue
 		}
 
 		filteredReleases = append(filteredReleases, release)
 	}
 
-	sort.Sort(byVersion(filteredReleases))
+	sort.Slice(filteredReleases, func(i, j int) bool {
+		first, err := version.NewVersionFromString(versionParser.parse(*filteredReleases[i].TagName))
+		if err != nil {
+			return true
+		}
+
+		second, err := version.NewVersionFromString(versionParser.parse(*filteredReleases[j].TagName))
+		if err != nil {
+			return false
+		}
+
+		return first.IsLt(second)
+	})
 
 	if len(filteredReleases) == 0 {
 		return []Version{}, nil
@@ -99,27 +116,3 @@ func (c *CheckCommand) Run(request CheckRequest) ([]Version, error) {
 
 	return reversedVersions, nil
 }
-
-type byVersion []*github.RepositoryRelease
-
-func (r byVersion) Len() int {
-	return len(r)
-}
-
-func (r byVersion) Swap(i, j int) {
-	r[i], r[j] = r[j], r[i]
-}
-
-func (r byVersion) Less(i, j int) bool {
-	first, err := version.NewVersionFromString(determineVersionFromTag(*r[i].TagName))
-	if err != nil {
-		return true
-	}
-
-	second, err := version.NewVersionFromString(determineVersionFromTag(*r[j].TagName))
-	if err != nil {
-		return false
-	}
-
-	return first.IsLt(second)
-}

check_command_test.go

@@ -93,6 +93,34 @@ var _ = Describe("Check Command", func() {
 		})
 
 		Context("when there are releases", func() {
+			Context("and there is a custom tag filter", func() {
+				BeforeEach(func() {
+					returnedReleases = []*github.RepositoryRelease{
+						newRepositoryRelease(1, "package-0.1.4"),
+						newRepositoryRelease(2, "package-0.4.0"),
+						newRepositoryRelease(3, "package-0.1.3"),
+						newRepositoryRelease(4, "package-0.1.2"),
+					}
+				})
+
+				It("returns all of the versions that are newer", func() {
+					command := resource.NewCheckCommand(githubClient)
+
+					response, err := command.Run(resource.CheckRequest{
+						Version: resource.Version{
+							Tag: "package-0.1.3",
+						},
+					})
+					Ω(err).ShouldNot(HaveOccurred())
+
+					Ω(response).Should(Equal([]resource.Version{
+						{Tag: "package-0.1.3"},
+						{Tag: "package-0.1.4"},
+						{Tag: "package-0.4.0"},
+					}))
+				})
+			})
+
 			Context("and the releases do not contain a draft release", func() {
 				BeforeEach(func() {
 					returnedReleases = []*github.RepositoryRelease{

in_command.go

@@ -55,7 +55,11 @@ func (c *InCommand) Run(destDir string, request InRequest) (InResponse, error) {
 			return InResponse{}, err
 		}
 
-		version := determineVersionFromTag(*foundRelease.TagName)
+		versionParser, err := newVersionParser(request.Source.TagFilter)
+		if err != nil {
+			return InResponse{}, err
+		}
+		version := versionParser.parse(*foundRelease.TagName)
 		versionPath := filepath.Join(destDir, "version")
 		err = ioutil.WriteFile(versionPath, []byte(version), 0644)
 		if err != nil {

in_command_test.go

@@ -180,6 +180,35 @@ var _ = Describe("In Command", func() {
 					Ω(string(contents)).Should(Equal("*markdown*"))
 				})
 
+				Context("when there is a custom tag filter", func() {
+					BeforeEach(func() {
+						inRequest.Source = resource.Source{
+							TagFilter: "package-(.*)",
+						}
+						githubClient.GetReleaseByTagReturns(buildRelease(1, "package-0.35.0", false), nil)
+						githubClient.GetRefReturns(buildTagRef("package-0.35.0", "f28085a4a8f744da83411f5e09fd7b1709149eee"), nil)
+						inResponse, inErr = command.Run(destDir, inRequest)
+					})
+
+					It("succeeds", func() {
+						inResponse, inErr = command.Run(destDir, inRequest)
+
+						Expect(inErr).ToNot(HaveOccurred())
+					})
+
+					It("does create the body, tag and version files", func() {
+						inResponse, inErr = command.Run(destDir, inRequest)
+
+						contents, err := ioutil.ReadFile(path.Join(destDir, "tag"))
+						Ω(err).ShouldNot(HaveOccurred())
+						Ω(string(contents)).Should(Equal("package-0.35.0"))
+
+						contents, err = ioutil.ReadFile(path.Join(destDir, "version"))
+						Ω(err).ShouldNot(HaveOccurred())
+						Ω(string(contents)).Should(Equal("0.35.0"))
+					})
+				})
+
 				Context("when include_source_tarball is true", func() {
 					var tarballUrl *url.URL
 

resources.go

@@ -14,6 +14,8 @@ type Source struct {
 	PreRelease       bool   `json:"pre_release"`
 	Release          bool   `json:"release"`
 	Insecure         bool   `json:"insecure"`
+
+	TagFilter string `json:"tag_filter"`
 }
 
 type CheckRequest struct {

versions.go

@@ -7,15 +7,29 @@ import (
 	"github.com/google/go-github/github"
 )
 
-// determineVersionFromTag converts git tags v1.2.3 into semver 1.2.3 values
+var defaultTagFilter = "v?([^v].*)"
-func determineVersionFromTag(tag string) string {
+
-	re := regexp.MustCompile("v?([^v].*)")
+type versionParser struct {
-	matches := re.FindStringSubmatch(tag)
+	re *regexp.Regexp
-	if len(matches) > 0 {
+}
-		return matches[1]
+
-	} else {
+func newVersionParser(filter string) (versionParser, error) {
-		return ""
+	if filter == "" {
+		filter = defaultTagFilter
 	}
+	re, err := regexp.Compile(filter)
+	if err != nil {
+		return versionParser{}, err
+	}
+	return versionParser{re: re}, nil
+}
+
+func (vp *versionParser) parse(tag string) string {
+	matches := vp.re.FindStringSubmatch(tag)
+	if len(matches) > 0 {
+		return matches[len(matches)-1]
+	}
+	return ""
 }
 
 func versionFromRelease(release *github.RepositoryRelease) Version {