/
mocknn.go
211 lines (176 loc) · 3.81 KB
/
mocknn.go
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package internal
import (
"encoding/json"
"flag"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"github.com/tenntenn/mocknn/internal/goflags"
"github.com/tenntenn/mocknn/internal/overlay"
"go.uber.org/multierr"
"golang.org/x/tools/go/packages"
)
const (
exitSuccess = 0
exitError = 1
)
type Mocknn struct {
Version string
Dir string
Output io.Writer
ErrOutput io.Writer
Input io.Reader
}
func Main(version string, args []string) int {
m := &Mocknn{
Version: version,
Dir: ".",
Output: os.Stdout,
ErrOutput: os.Stderr,
Input: os.Stdin,
}
return m.Main(args)
}
func (m *Mocknn) Main(args []string) int {
if err := m.Run(args); err != nil {
fmt.Fprintln(m.ErrOutput, "mocknn:", err)
return exitError
}
return exitSuccess
}
func (m *Mocknn) Run(args []string) error {
if len(args) == 0 {
args = []string{"."}
}
switch args[0] {
case "-v":
if _, err := fmt.Fprintln(os.Stdout, "mocknn", m.Version); err != nil {
return err
}
case "test":
if err := m.testWithMock(args[1:]); err != nil {
return err
}
default:
if err := m.printOverlayJSON(args); err != nil {
return err
}
}
return nil
}
func (m *Mocknn) load(patterns []string) (_ []*packages.Package, rerr error) {
config := &packages.Config{
Dir: m.Dir,
Tests: true,
Mode: packages.NeedName | packages.NeedTypes |
packages.NeedSyntax | packages.NeedTypesInfo |
packages.NeedModule,
}
pkgs, err := packages.Load(config, patterns...)
if err != nil {
return nil, err
}
packages.Visit(pkgs, nil, func(pkg *packages.Package) {
for _, err := range pkg.Errors {
rerr = multierr.Append(rerr, err)
}
})
if rerr != nil {
return nil, rerr
}
return pkgs, nil
}
func (m *Mocknn) testWithMock(args []string) (rerr error) {
tmpdir, err := os.MkdirTemp("", "mocknn-*")
if err != nil {
return err
}
defer func() {
rerr = multierr.Append(rerr, os.RemoveAll(tmpdir))
}()
var flagOverlay string
flags := flag.NewFlagSet("mocknn test", flag.ContinueOnError)
flags.SetOutput(io.Discard)
flags.StringVar(&flagOverlay, "overlay", "", "overlay json")
goflags.All(flags)
if err := flags.Parse(args); err != nil {
return err
}
var initOverlay *packages.OverlayJSON
if flagOverlay != "" {
f, err := os.Open(flagOverlay)
if err != nil {
return err
}
defer f.Close()
if err := json.NewDecoder(f).Decode(&initOverlay); err != nil {
return err
}
}
pkgs, err := m.load(flags.Args())
if err != nil {
return err
}
g := &overlay.Generator{
Dir: tmpdir,
Pkgs: pkgs,
Overlay: initOverlay,
}
overlayJSON, err := g.Generate()
if err != nil {
return err
}
f, err := os.Create(filepath.Join(tmpdir, "overlay.json"))
if err != nil {
return err
}
if err := json.NewEncoder(f).Encode(overlayJSON); err != nil {
return err
}
defer func() {
rerr = multierr.Append(rerr, f.Close())
}()
opts := make([]string, 0, flags.NFlag())
flags.Visit(func(f *flag.Flag) {
opts = append(opts, fmt.Sprintf("-%s=%v", f.Name, f.Value))
})
goargs := append([]string{"test", "-overlay", f.Name()}, append(opts, flags.Args()...)...)
cmd := exec.Command("go", goargs...)
cmd.Stdout = m.Output
cmd.Stderr = m.ErrOutput
cmd.Stdin = m.Input
cmd.Dir = m.Dir
if err := cmd.Run(); err != nil {
return err
}
return nil
}
func (m *Mocknn) printOverlayJSON(args []string) (rerr error) {
pkgs, err := m.load(args)
if err != nil {
return err
}
g := &overlay.Generator{
Pkgs: pkgs,
}
overlayJSON, err := g.Generate()
if err != nil {
return err
}
f, err := os.CreateTemp("", "mocknn-overlay-*.json")
if err != nil {
return err
}
defer func() {
rerr = multierr.Append(rerr, f.Close())
}()
if err := json.NewEncoder(f).Encode(overlayJSON); err != nil {
return err
}
if _, err := fmt.Fprint(m.Output, f.Name()); err != nil {
return err
}
return nil
}