chore(go): scaffold module and add failing link tests

internal/homesick/core/core.go

@@ -0,0 +1,185 @@
+package core
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"io/fs"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"sort"
+	"strings"
+)
+
+type App struct {
+	HomeDir  string
+	ReposDir string
+	Stdout   io.Writer
+	Stderr   io.Writer
+	Verbose  bool
+}
+
+func New(stdout io.Writer, stderr io.Writer) (*App, error) {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return nil, fmt.Errorf("resolve home directory: %w", err)
+	}
+
+	return &App{
+		HomeDir:  home,
+		ReposDir: filepath.Join(home, ".homesick", "repos"),
+		Stdout:   stdout,
+		Stderr:   stderr,
+	}, nil
+}
+
+func (a *App) Version(version string) error {
+	_, err := fmt.Fprintln(a.Stdout, version)
+	return err
+}
+
+func (a *App) ShowPath(castle string) error {
+	_, err := fmt.Fprintln(a.Stdout, filepath.Join(a.ReposDir, castle))
+	return err
+}
+
+func (a *App) Clone(uri string, destination string) error {
+	if uri == "" {
+		return errors.New("clone requires URI")
+	}
+
+	if destination == "" {
+		destination = deriveDestination(uri)
+	}
+	if destination == "" {
+		return fmt.Errorf("unable to derive destination from uri %q", uri)
+	}
+
+	if err := os.MkdirAll(a.ReposDir, 0o755); err != nil {
+		return fmt.Errorf("create repos directory: %w", err)
+	}
+
+	destinationPath := filepath.Join(a.ReposDir, destination)
+
+	if fi, err := os.Stat(uri); err == nil && fi.IsDir() {
+		if err := os.Symlink(uri, destinationPath); err != nil {
+			return fmt.Errorf("symlink local castle: %w", err)
+		}
+		return nil
+	}
+
+	if err := runGit(a.ReposDir, "clone", "-q", "--config", "push.default=upstream", "--recursive", uri, destination); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func (a *App) List() error {
+	if err := os.MkdirAll(a.ReposDir, 0o755); err != nil {
+		return err
+	}
+
+	var castles []string
+	err := filepath.WalkDir(a.ReposDir, func(path string, d fs.DirEntry, walkErr error) error {
+		if walkErr != nil {
+			return walkErr
+		}
+		if !d.IsDir() || d.Name() != ".git" {
+			return nil
+		}
+
+		castleRoot := filepath.Dir(path)
+		rel, err := filepath.Rel(a.ReposDir, castleRoot)
+		if err != nil {
+			return err
+		}
+		castles = append(castles, rel)
+		return filepath.SkipDir
+	})
+	if err != nil {
+		return err
+	}
+
+	sort.Strings(castles)
+	for _, castle := range castles {
+		castleRoot := filepath.Join(a.ReposDir, castle)
+		remote, remoteErr := gitOutput(castleRoot, "config", "remote.origin.url")
+		if remoteErr != nil {
+			remote = ""
+		}
+		_, writeErr := fmt.Fprintf(a.Stdout, "%s %s\n", castle, strings.TrimSpace(remote))
+		if writeErr != nil {
+			return writeErr
+		}
+	}
+
+	return nil
+}
+
+func (a *App) Status(castle string) error {
+	return runGit(filepath.Join(a.ReposDir, castle), "status")
+}
+
+func (a *App) Diff(castle string) error {
+	return runGit(filepath.Join(a.ReposDir, castle), "diff")
+}
+
+func (a *App) Link(string) error {
+	return errors.New("link is not implemented in Go yet")
+}
+
+func (a *App) Unlink(string) error {
+	return errors.New("unlink is not implemented in Go yet")
+}
+
+func (a *App) Track(string, string) error {
+	return errors.New("track is not implemented in Go yet")
+}
+
+func runGit(dir string, args ...string) error {
+	cmd := exec.Command("git", args...)
+	cmd.Dir = dir
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("git %s failed: %w", strings.Join(args, " "), err)
+	}
+	return nil
+}
+
+func gitOutput(dir string, args ...string) (string, error) {
+	cmd := exec.Command("git", args...)
+	cmd.Dir = dir
+	out, err := cmd.Output()
+	if err != nil {
+		return "", err
+	}
+	return string(out), nil
+}
+
+func deriveDestination(uri string) string {
+	candidate := strings.TrimSpace(uri)
+	candidate = strings.TrimPrefix(candidate, "https://github.com/")
+	candidate = strings.TrimPrefix(candidate, "http://github.com/")
+	candidate = strings.TrimPrefix(candidate, "git://github.com/")
+
+	if strings.HasPrefix(candidate, "file://") {
+		candidate = strings.TrimPrefix(candidate, "file://")
+	}
+
+	candidate = strings.TrimSuffix(candidate, ".git")
+	candidate = strings.TrimSuffix(candidate, "/")
+	if candidate == "" {
+		return ""
+	}
+
+	parts := strings.Split(candidate, "/")
+	last := parts[len(parts)-1]
+	if strings.Contains(last, ":") {
+		a := strings.Split(last, ":")
+		last = a[len(a)-1]
+	}
+	return last
+}

internal/homesick/core/core_test.go

@@ -0,0 +1,24 @@
+package core
+
+import "testing"
+
+func TestDeriveDestination(t *testing.T) {
+	tests := []struct {
+		name string
+		uri  string
+		want string
+	}{
+		{name: "github short", uri: "technicalpickles/pickled-vim", want: "pickled-vim"},
+		{name: "https", uri: "https://github.com/technicalpickles/pickled-vim.git", want: "pickled-vim"},
+		{name: "git ssh", uri: "git@github.com:technicalpickles/pickled-vim.git", want: "pickled-vim"},
+		{name: "file", uri: "file:///tmp/dotfiles.git", want: "dotfiles"},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := deriveDestination(tt.uri); got != tt.want {
+				t.Fatalf("deriveDestination(%q) = %q, want %q", tt.uri, got, tt.want)
+			}
+		})
+	}
+}

internal/homesick/core/link_test.go

@@ -0,0 +1,118 @@
+package core_test
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"testing"
+
+	"git.hrafn.xyz/aether/gosick/internal/homesick/core"
+	"github.com/stretchr/testify/require"
+	"github.com/stretchr/testify/suite"
+)
+
+type LinkSuite struct {
+	suite.Suite
+	tmpDir   string
+	homeDir  string
+	reposDir string
+	app      *core.App
+}
+
+func TestLinkSuite(t *testing.T) {
+	suite.Run(t, new(LinkSuite))
+}
+
+func (s *LinkSuite) SetupTest() {
+	s.tmpDir = s.T().TempDir()
+	s.homeDir = filepath.Join(s.tmpDir, "home")
+	s.reposDir = filepath.Join(s.homeDir, ".homesick", "repos")
+
+	require.NoError(s.T(), os.MkdirAll(s.reposDir, 0o755))
+
+	s.app = &core.App{
+		HomeDir:  s.homeDir,
+		ReposDir: s.reposDir,
+		Stdout:   io.Discard,
+		Stderr:   io.Discard,
+	}
+}
+
+func (s *LinkSuite) createCastle(castle string) string {
+	castleHome := filepath.Join(s.reposDir, castle, "home")
+	require.NoError(s.T(), os.MkdirAll(castleHome, 0o755))
+	return castleHome
+}
+
+func (s *LinkSuite) writeFile(path string, content string) {
+	require.NoError(s.T(), os.MkdirAll(filepath.Dir(path), 0o755))
+	require.NoError(s.T(), os.WriteFile(path, []byte(content), 0o644))
+}
+
+func (s *LinkSuite) TestLink_SymlinksTopLevelFiles() {
+	castleHome := s.createCastle("glencairn")
+	dotfile := filepath.Join(castleHome, ".vimrc")
+	s.writeFile(dotfile, "set number\n")
+
+	err := s.app.Link("glencairn")
+	require.NoError(s.T(), err)
+
+	homePath := filepath.Join(s.homeDir, ".vimrc")
+	info, err := os.Lstat(homePath)
+	require.NoError(s.T(), err)
+	require.True(s.T(), info.Mode()&os.ModeSymlink != 0)
+
+	target, err := os.Readlink(homePath)
+	require.NoError(s.T(), err)
+	require.Equal(s.T(), dotfile, target)
+}
+
+func (s *LinkSuite) TestLink_RespectsHomesickSubdir() {
+	castleHome := s.createCastle("glencairn")
+	configDir := filepath.Join(castleHome, ".config")
+	appDir := filepath.Join(configDir, "myapp")
+	s.writeFile(filepath.Join(appDir, "config.toml"), "ok=true\n")
+	s.writeFile(filepath.Join(s.reposDir, "glencairn", ".homesick_subdir"), ".config\n")
+
+	err := s.app.Link("glencairn")
+	require.NoError(s.T(), err)
+
+	configInfo, err := os.Lstat(filepath.Join(s.homeDir, ".config"))
+	require.NoError(s.T(), err)
+	require.False(s.T(), configInfo.Mode()&os.ModeSymlink != 0)
+
+	homeApp := filepath.Join(s.homeDir, ".config", "myapp")
+	appInfo, err := os.Lstat(homeApp)
+	require.NoError(s.T(), err)
+	require.True(s.T(), appInfo.Mode()&os.ModeSymlink != 0)
+
+	target, err := os.Readlink(homeApp)
+	require.NoError(s.T(), err)
+	require.Equal(s.T(), appDir, target)
+}
+
+func (s *LinkSuite) TestLink_ForceReplacesExistingFile() {
+	castleHome := s.createCastle("glencairn")
+	dotfile := filepath.Join(castleHome, ".zshrc")
+	s.writeFile(dotfile, "export EDITOR=vim\n")
+	s.writeFile(filepath.Join(s.homeDir, ".zshrc"), "existing\n")
+
+	s.app.Force = true
+	err := s.app.Link("glencairn")
+	require.NoError(s.T(), err)
+
+	homePath := filepath.Join(s.homeDir, ".zshrc")
+	info, err := os.Lstat(homePath)
+	require.NoError(s.T(), err)
+	require.True(s.T(), info.Mode()&os.ModeSymlink != 0)
+}
+
+func (s *LinkSuite) TestLink_NoForceErrorsOnConflict() {
+	castleHome := s.createCastle("glencairn")
+	dotfile := filepath.Join(castleHome, ".gitconfig")
+	s.writeFile(dotfile, "[user]\n")
+	s.writeFile(filepath.Join(s.homeDir, ".gitconfig"), "local\n")
+
+	err := s.app.Link("glencairn")
+	require.Error(s.T(), err)
+}