Merge pull request #17 from kazhuravlev/ka/support-local-installation

Ka/support local installation

cmd/gt/main.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	repomanager "github.com/kazhuravlev/git-tools/internal/repo-manager"
+	"github.com/kazhuravlev/git-tools/internal/which"
 	"github.com/urfave/cli/v3"
 	"io"
 	"os"
@@ -310,15 +311,25 @@ func cmdHooksInstallAll(ctx context.Context, c *cli.Command, m *repomanager.Mana
 			content.WriteString(fmt.Sprintf("# hook file (%s) is backed up into (%s) at (%s)\n", hookFilename, hookFilenameBackup, time.Now().Format(time.DateTime)))
 		}
 
+		gtExecutable := "gt"
+		if _, err := which.Executable(os.DirFS("/"), "gt"); err != nil {
+			p, err := os.Executable()
+			if err != nil {
+				return fmt.Errorf("cannot get executable: %w", err)
+			}
+
+			gtExecutable = p
+		}
+
 		content.WriteString(fmt.Sprintf(`
 if command -v gt >/dev/null 2>&1; then
-  gt hooks exec %s $1
+  %s hooks exec %s $1
 else
   echo "Can't find git-tools (gt binary)"
   echo "Check the docs https://github.com/kazhuravlev/git-tools"
 	exit 1
 fi
-`, hooks[i]))
+`, gtExecutable, hooks[i]))
 		content.WriteString("\n")
 
 		target, err := os.Create(hookFilename)

internal/which/which.go

@@ -0,0 +1,58 @@
+package which
+
+import (
+	"errors"
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+var ErrNotExecutable = errors.New("not executable")
+
+// Executable returns a full path to first executable program in $PATH.
+func Executable(fSys fs.FS, program string) (string, error) {
+	for _, path := range getPaths() {
+		filename := filepath.Join(path, program)
+		executable, err := isExecutable(fSys, filename)
+		if err != nil {
+			if errors.Is(err, os.ErrNotExist) {
+				continue
+			}
+			return "", fmt.Errorf("check executable for file (%s): %w", filename, err)
+		}
+
+		if executable {
+			return filename, nil
+		}
+	}
+
+	return "", ErrNotExecutable
+}
+
+func isExecAny(mode os.FileMode) bool {
+	return mode&0x0111 != 0
+}
+
+func isExecutable(fSys fs.FS, path string) (bool, error) {
+	info, err := fs.Stat(fSys, path[1:])
+	if err != nil {
+		return false, fmt.Errorf("get file stat: %w", err)
+	}
+
+	if info.IsDir() {
+		return false, nil
+	}
+
+	if isExecAny(info.Mode()) {
+		return true, nil
+	}
+
+	return runtime.GOOS == "windows", nil
+}
+
+func getPaths() []string {
+	return strings.Split(os.Getenv("PATH"), string(os.PathListSeparator))
+}