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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build go1.18
// +build go1.18
package main
import (
"bytes"
"context"
"encoding/json"
"flag"
"fmt"
"log"
"os"
"os/exec"
"github.com/google/go-cmp/cmp"
"golang.org/x/tools/gopls/internal/lsp/source"
)
const usage = `api-diff <previous version> [<current version>]
Compare the API of two gopls versions. If the second argument is provided, it
will be used as the new version to compare against. Otherwise, compare against
the current API.
`
func main() {
flag.Parse()
if flag.NArg() < 1 || flag.NArg() > 2 {
fmt.Fprint(os.Stderr, usage)
os.Exit(2)
}
oldVer := flag.Arg(0)
newVer := ""
if flag.NArg() == 2 {
newVer = flag.Arg(1)
}
apiDiff, err := diffAPI(oldVer, newVer)
if err != nil {
log.Fatal(err)
}
fmt.Println("\n" + apiDiff)
}
func diffAPI(oldVer, newVer string) (string, error) {
ctx := context.Background()
previousAPI, err := loadAPI(ctx, oldVer)
if err != nil {
return "", fmt.Errorf("loading %s: %v", oldVer, err)
}
var currentAPI *source.APIJSON
if newVer == "" {
currentAPI = source.GeneratedAPIJSON
} else {
var err error
currentAPI, err = loadAPI(ctx, newVer)
if err != nil {
return "", fmt.Errorf("loading %s: %v", newVer, err)
}
}
return cmp.Diff(previousAPI, currentAPI), nil
}
func loadAPI(ctx context.Context, version string) (*source.APIJSON, error) {
ver := fmt.Sprintf("golang.org/x/tools/gopls@%s", version)
cmd := exec.Command("go", "run", ver, "api-json")
stdout := &bytes.Buffer{}
stderr := &bytes.Buffer{}
cmd.Stdout = stdout
cmd.Stderr = stderr
if err := cmd.Run(); err != nil {
return nil, fmt.Errorf("go run failed: %v; stderr:\n%s", err, stderr)
}
apiJson := &source.APIJSON{}
if err := json.Unmarshal(stdout.Bytes(), apiJson); err != nil {
return nil, fmt.Errorf("unmarshal: %v", err)
}
return apiJson, nil
}
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