Refactor packages structure

- Isolate files into their own packages
- Create new printer package and interface
- Refactor Repo stuct to embed the go-git *Repository directly
- Simplify cmd package

print/tree_test.go

@@ -0,0 +1,108 @@
+package print
+
+import (
+	"fmt"
+	"git-get/git"
+	"strings"
+	"testing"
+)
+
+func TestTree(t *testing.T) {
+	var tests = []struct {
+		paths []string
+		want  string
+	}{
+		{
+			[]string{
+				"root/github.com/grdl/repo1",
+			}, `
+root/
+github.com/grdl/repo1
+`,
+		},
+		{
+			[]string{
+				"root/github.com/grdl/repo1",
+				"root/github.com/grdl/repo2",
+			}, `
+root/
+github.com/grdl/
+	repo1
+	repo2
+`,
+		},
+		{
+			[]string{
+				"root/gitlab.com/grdl/repo1",
+				"root/github.com/grdl/repo1",
+			}, `
+root/
+gitlab.com/grdl/repo1
+github.com/grdl/repo1
+`,
+		},
+		{
+			[]string{
+				"root/gitlab.com/grdl/repo1",
+				"root/gitlab.com/grdl/repo2",
+				"root/gitlab.com/other/repo1",
+				"root/github.com/grdl/repo1",
+				"root/github.com/grdl/nested/repo2",
+			}, `
+root/
+gitlab.com/
+	grdl/
+		repo1
+		repo2
+	other/repo1
+github.com/grdl/
+	repo1
+	nested/repo2
+`,
+		},
+		{
+			[]string{
+				"root/gitlab.com/grdl/nested/repo1",
+				"root/gitlab.com/grdl/nested/repo2",
+				"root/gitlab.com/other/repo1",
+			}, `
+root/
+gitlab.com/
+	grdl/nested/
+		repo1
+		repo2
+	other/repo1
+`,
+		},
+		{
+			[]string{
+				"root/gitlab.com/grdl/double/nested/repo1",
+				"root/gitlab.com/grdl/nested/repo2",
+				"root/gitlab.com/other/repo1",
+			}, `
+root/
+gitlab.com/
+	grdl/
+		double/nested/repo1
+		nested/repo2
+	other/repo1
+`,
+		},
+	}
+
+	for i, test := range tests {
+		var repos []*git.Repo
+		for _, path := range test.paths {
+			repos = append(repos, git.NewRepo(nil, path)) //&Repo{path: path})
+		}
+
+		tree := BuildTree("root", repos)
+		// Leading and trailing newlines are added to test cases for readability. We also need to add them to the rendering result.
+		got := fmt.Sprintf("\n%s\n", RenderSmartTree(tree))
+
+		// Rendered tree uses spaces for indentation but the test cases use tabs.
+		if got != strings.ReplaceAll(test.want, "\t", "    ") {
+			t.Errorf("Failed test case %d, got: %+v; want: %+v", i, got, test.want)
+		}
+	}
+}