Merge pull request #19 from shurcooL/add-code.google.com-presenter

Add presenter for code.google.com/p/... Go packages.

presenter/codegoogle.go

@@ -0,0 +1,94 @@
+package presenter
+
+import (
+	"html/template"
+	"net/url"
+	"strings"
+
+	"github.com/shurcooL/go/gists/gist7480523"
+	"github.com/sourcegraph/go-vcs/vcs"
+	"github.com/sourcegraph/vcsstore/vcsclient"
+)
+
+type codeGooglePresenter struct {
+	repo *gist7480523.GoPackageRepo
+
+	comparison codeGoogleComparison
+}
+
+func newCodeGooglePresenter(repo *gist7480523.GoPackageRepo) Presenter {
+	return &codeGooglePresenter{
+		repo:       repo,
+		comparison: newCodeGoogleComparison(repo),
+	}
+}
+
+func (this codeGooglePresenter) Repo() *gist7480523.GoPackageRepo {
+	return this.repo
+}
+func (this codeGooglePresenter) HomePage() *template.URL {
+	url := template.URL("https://" + this.repo.RepoImportPath())
+	return &url
+}
+func (_ codeGooglePresenter) Image() template.URL {
+	return "https://github.com/images/gravatars/gravatar-user-420.png"
+}
+func (this codeGooglePresenter) Changes() <-chan Change {
+	if this.comparison.err != nil {
+		return nil
+	}
+	out := make(chan Change)
+	go func() {
+		foundLocalRev := false
+		for _, commit := range this.comparison.commits {
+			// Break out when/if we reach the current local revision.
+			if commit.ID == vcs.CommitID(this.repo.GoPackages()[0].Dir.Repo.VcsLocal.LocalRev) {
+				foundLocalRev = true
+				break
+			}
+			out <- changeMessage(firstParagraph(commit.Message))
+		}
+		if !foundLocalRev {
+			out <- changeMessage("... (there may be more changes, not shown)")
+		}
+		close(out)
+	}()
+	return out
+}
+
+// firstParagraph returns the first paragraph of a string.
+func firstParagraph(s string) string {
+	if index := strings.Index(s, "\n\n"); index != -1 {
+		return s[:index]
+	}
+	return s
+}
+
+// ---
+
+var sg = vcsclient.New(&url.URL{Scheme: "http", Host: "vcsstore.sourcegraph.com"}, nil)
+
+type codeGoogleComparison struct {
+	commits []*vcs.Commit
+	err     error
+}
+
+func newCodeGoogleComparison(repo *gist7480523.GoPackageRepo) (c codeGoogleComparison) {
+	cloneUrl, err := url.Parse("https://" + repo.RepoImportPath())
+	if err != nil {
+		c.err = err
+		return
+	}
+
+	r, err := sg.Repository("hg", cloneUrl) // code.google.com/p/... repos are known to use Mercurial.
+	if err != nil {
+		c.err = err
+		return
+	}
+
+	c.commits, _, c.err = r.Commits(vcs.CommitsOptions{
+		Head: vcs.CommitID(repo.GoPackages()[0].Dir.Repo.VcsRemote.RemoteRev),
+		N:    20, // Cap for now. TODO: Support arbtirary second revision to go until.
+	})
+	return
+}

presenter/presenter.go

@@ -69,8 +69,7 @@ func init() {
 	addProvider(func(repo *gist7480523.GoPackageRepo) Presenter {
 		goPackage := repo.GoPackages()[0]
 		if strings.HasPrefix(goPackage.Bpkg.ImportPath, "code.google.com/") {
-			// TODO: Add presenter support for code.google.com?
-			return nil
+			return newCodeGooglePresenter(repo)
 		}
 		return nil
 	})