Introduce simple git cloner.

pkg/loader/gitcloner_test.go

@@ -17,6 +17,8 @@ limitations under the License.
 package loader
 
 import (
+	"fmt"
+	"path/filepath"
 	"strings"
 	"testing"
 
@@ -38,6 +40,14 @@ func TestIsRepoURL(t *testing.T) {
 			input:    "github.com/org/repo",
 			expected: true,
 		},
+		{
+			input:    "git@github.com:org/repo",
+			expected: true,
+		},
+		{
+			input:    "gh:org/repo",
+			expected: true,
+		},
 		{
 			input:    "git::https://gitlab.com/org/repo",
 			expected: true,
@@ -168,3 +178,52 @@ whatever
 			coRoot+"/"+pathInRepo, l2.Root())
 	}
 }
+
+var repoNames = []string{"someOrg/someRepo", "kubernetes/website"}
+
+var paths = []string{"", "README.md", "foo/index.md"}
+
+var extractFmts = []string{
+	"gh:%s",
+	"GH:%s",
+	"gitHub.com/%s",
+	"https://github.com/%s",
+	"hTTps://github.com/%s",
+	"git::https://gitlab.com/%s",
+	"git@gitHUB.com:%s.git",
+	"github.com:%s",
+}
+
+func TestExtractGithubRepoName(t *testing.T) {
+	for _, repoName := range repoNames {
+		for _, pathName := range paths {
+			for _, extractFmt := range extractFmts {
+				spec := repoName
+				if len(pathName) > 0 {
+					spec = filepath.Join(spec, pathName)
+				}
+				input := fmt.Sprintf(extractFmt, spec)
+				if !isRepoUrl(input) {
+					t.Errorf("Should smell like github arg: %s\n", input)
+					continue
+				}
+				repo, path, err := extractGithubRepoName(input)
+				if err != nil {
+					t.Errorf("problem %v", err)
+				}
+				if repo != repoName {
+					t.Errorf("\n"+
+						"       from %s\n"+
+						"    gotRepo %s\n"+
+						"desiredRepo %s\n", input, repo, repoName)
+				}
+				if path != pathName {
+					t.Errorf("\n"+
+						"       from %s\n"+
+						"    gotPath %s\n"+
+						"desiredPath %s\n", input, path, pathName)
+				}
+			}
+		}
+	}
+}