Add URL parsing function and its unit tests

pkg/url.go

@@ -0,0 +1,28 @@
+package pkg
+
+import (
+	"net/url"
+	"path"
+	"strings"
+
+	"github.com/pkg/errors"
+)
+
+// TODO: maybe use https://github.com/whilp/git-urls?
+
+func URLToPath(rawurl string) (string, error) {
+	parsed, err := url.Parse(rawurl)
+	if err != nil {
+		return "", errors.Wrap(err, "Failed parsing URL")
+	}
+
+	repoHost := strings.Split(parsed.Host, ":")[0]
+
+	repoPath := parsed.Path
+	//repoPath = strings.TrimSuffix(repoPath, ".git/")
+	//repoPath = strings.TrimSuffix(repoPath, ".git")
+
+	localPath := path.Join(repoHost, repoPath)
+	localPath = strings.TrimSuffix(localPath, ".git")
+	return localPath, nil
+}

pkg/url_test.go

@@ -0,0 +1,63 @@
+package pkg
+
+import "testing"
+
+// Following URLs are considered valid according to https://git-scm.com/docs/git-clone#_git_urls:
+// ssh://[user@]host.xz[:port]/path/to/repo.git
+// ssh://[user@]host.xz[:port]/~[user]/path/to/repo.git/
+// [user@]host.xz:path/to/repo.git/
+// [user@]host.xz:/~[user]/path/to/repo.git/
+// git://host.xz[:port]/path/to/repo.git/
+// git://host.xz[:port]/~[user]/path/to/repo.git/
+// http[s]://host.xz[:port]/path/to/repo.git/
+// ftp[s]://host.xz[:port]/path/to/repo.git/
+// /path/to/repo.git/
+// file:///path/to/repo.git/
+
+func TestURLParse(t *testing.T) {
+	tests := []struct {
+		in   string
+		want string
+	}{
+
+		{"ssh://github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"ssh://user@github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"ssh://user@github.com/~user/grdl/git-get.git", "github.com/~user/grdl/git-get"}, // TODO: is this what we want or should the result be github.com/grdl/git-get?
+		{"git@github.com:grdl/git-get.git", "github.com/grdl/git-get"},
+		{"git@github.com:/~user/grdl/git-get.git", "github.com/grdl/git-get"},
+
+		{"https://github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+
+		{"https://github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"http://github.com/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get", "github.com/grdl/git-get"},
+		{"https://github.com/git-get.git", "github.com/git-get"},
+		{"https://github.com/git-get", "github.com/git-get"},
+		{"https://github.com/grdl/sub/path/git-get.git", "github.com/grdl/sub/path/git-get"},
+		{"https://github.com:1234/grdl/git-get.git", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get.git/", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get/", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get/////", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get.git/////", "github.com/grdl/git-get"},
+
+		{"local/grdl/git-get/", "local/grdl/git-get"},
+		{"file://local/grdl/git-get", "local/grdl/git-get"},
+		{"https://github.com/grdl/git-get/////", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get/////", "github.com/grdl/git-get"},
+		{"https://github.com/grdl/git-get/////", "github.com/grdl/git-get"},
+	}
+
+	for _, test := range tests {
+		got, err := URLToPath(test.in)
+		if err != nil {
+			t.Errorf("Error parsing URL: %+v", err)
+		}
+
+		if got != test.want {
+			t.Errorf("Wrong result of parsing URL: %s, got: %s; want: %s", test.in, got, test.want)
+		}
+	}
+}