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oapi-codegen.go
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// Copyright 2019 DeepMap, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"path"
"path/filepath"
"strings"
"github.com/deepmap/oapi-codegen/pkg/codegen"
"github.com/deepmap/oapi-codegen/pkg/util"
)
func errExit(format string, args ...interface{}) {
_, _ = fmt.Fprintf(os.Stderr, format, args...)
os.Exit(1)
}
func main() {
var (
packageName string
generate string
outputFile string
includeTags string
excludeTags string
templatesDir string
)
flag.StringVar(&packageName, "package", "", "The package name for generated code")
flag.StringVar(&generate, "generate", "types,client,server,spec",
`Comma-separated list of code to generate; valid options: "types", "client", "chi-server", "server", "spec", "skip-fmt", "skip-prune"`)
flag.StringVar(&outputFile, "o", "", "Where to output generated code, stdout is default")
flag.StringVar(&includeTags, "include-tags", "", "Only include operations with the given tags. Comma-separated list of tags.")
flag.StringVar(&excludeTags, "exclude-tags", "", "Exclude operations that are tagged with the given tags. Comma-separated list of tags.")
flag.StringVar(&templatesDir, "templates", "", "Path to directory containing user templates")
flag.Parse()
if flag.NArg() < 1 {
fmt.Println("Please specify a path to a OpenAPI 3.0 spec file")
os.Exit(1)
}
// If the package name has not been specified, we will use the name of the
// swagger file.
if packageName == "" {
path := flag.Arg(0)
baseName := filepath.Base(path)
// Split the base name on '.' to get the first part of the file.
nameParts := strings.Split(baseName, ".")
packageName = codegen.ToCamelCase(nameParts[0])
}
opts := codegen.Options{}
for _, g := range splitCSVArg(generate) {
switch g {
case "client":
opts.GenerateClient = true
case "chi-server":
opts.GenerateChiServer = true
case "server":
opts.GenerateEchoServer = true
case "types":
opts.GenerateTypes = true
case "spec":
opts.EmbedSpec = true
case "skip-fmt":
opts.SkipFmt = true
case "skip-prune":
opts.SkipPrune = true
default:
fmt.Printf("unknown generate option %s\n", g)
flag.PrintDefaults()
os.Exit(1)
}
}
opts.IncludeTags = splitCSVArg(includeTags)
opts.ExcludeTags = splitCSVArg(excludeTags)
if opts.GenerateEchoServer && opts.GenerateChiServer {
errExit("can not specify both server and chi-server targets simultaneously")
}
swagger, err := util.LoadSwagger(flag.Arg(0))
if err != nil {
errExit("error loading swagger spec\n: %s", err)
}
templates, err := loadTemplateOverrides(templatesDir)
if err != nil {
errExit("error loading template overrides: %s\n", err)
}
opts.UserTemplates = templates
code, err := codegen.Generate(swagger, packageName, opts)
if err != nil {
errExit("error generating code: %s\n", err)
}
if outputFile != "" {
err = ioutil.WriteFile(outputFile, []byte(code), 0644)
if err != nil {
errExit("error writing generated code to file: %s", err)
}
} else {
fmt.Println(code)
}
}
func splitCSVArg(input string) []string {
input = strings.TrimSpace(input)
if len(input) == 0 {
return nil
}
splitInput := strings.Split(input, ",")
args := make([]string, 0, len(splitInput))
for _, s := range splitInput {
s = strings.TrimSpace(s)
if len(s) > 0 {
args = append(args, s)
}
}
return args
}
func loadTemplateOverrides(templatesDir string) (map[string]string, error) {
var templates = make(map[string]string)
if templatesDir == "" {
return templates, nil
}
files, err := ioutil.ReadDir(templatesDir)
if err != nil {
return nil, err
}
for _, f := range files {
data, err := ioutil.ReadFile(path.Join(templatesDir, f.Name()))
if err != nil {
return nil, err
}
templates[f.Name()] = string(data)
}
return templates, nil
}