mirror of https://github.com/kubernetes/kops.git
137 lines
3.4 KiB
Go
137 lines
3.4 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package codegen
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import (
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"bytes"
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"flag"
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"fmt"
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"go/format"
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"io/ioutil"
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"log"
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"os"
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"path/filepath"
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"strings"
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)
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var (
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flagTypes = flag.String("type", "", "comma-separated list of type names; must be set")
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output = flag.String("output", "", "output file name; default srcdir/<type>_fitask.go")
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)
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// Usage is a replacement usage function for the flags package.
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func Usage() {
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fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
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fmt.Fprintf(os.Stderr, "\tfitask [flags] -type T [directory]\n")
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fmt.Fprintf(os.Stderr, "\tfitask [flags] -type T files... # Must be a single package\n")
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fmt.Fprintf(os.Stderr, "Flags:\n")
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flag.PrintDefaults()
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}
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// isDirectory reports whether the named file is a directory.
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func isDirectory(name string) bool {
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info, err := os.Stat(name)
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if err != nil {
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log.Fatal(err)
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}
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return info.IsDir()
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}
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func RunGenerator(key string, generator Generator) {
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flag.Usage = Usage
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flag.Parse()
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if len(*flagTypes) == 0 {
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flag.Usage()
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os.Exit(2)
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}
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typeNames := strings.Split(*flagTypes, ",")
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// We accept either one directory or a list of files. Which do we have?
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args := flag.Args()
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if len(args) == 0 {
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// Default: process whole package in current directory.
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args = []string{"."}
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}
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// Parse the package once.
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var dir string
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var parser GoParser
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if len(args) == 1 && isDirectory(args[0]) {
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dir = args[0]
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parser.parsePackageDir(args[0])
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//} else {
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// dir = filepath.Dir(args[0])
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// g.parsePackageFiles(args)
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}
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err := generator.Init(&parser)
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if err != nil {
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log.Fatalf("error initializing generator: %v", err)
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}
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var b bytes.Buffer
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err = generator.WriteFileHeader(&b)
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if err != nil {
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log.Fatalf("error generating header: %v", err)
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}
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fmt.Fprintf(&b, "// Code generated by \"%q %s\"; DO NOT EDIT\n\n", key, strings.Join(os.Args[1:], " "))
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err = generator.WritePreamble(&b)
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if err != nil {
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log.Fatalf("error generating header: %v", err)
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}
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// Run generate for each type.
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for _, typeName := range typeNames {
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err := generator.WriteType(&b, typeName)
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if err != nil {
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log.Fatalf("error generating header: %v", err)
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}
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}
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// gofmt the output.
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src := gofmt(b.Bytes())
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// Write to file.
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outputName := *output
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if outputName == "" {
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baseName := fmt.Sprintf("%s_%s.go", typeNames[0], key)
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outputName = filepath.Join(dir, strings.ToLower(baseName))
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}
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err = ioutil.WriteFile(outputName, src, 0644)
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if err != nil {
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log.Fatalf("writing output: %s", err)
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}
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}
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// format returns the gofmt-ed contents of the Generator's buffer.
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func gofmt(src []byte) []byte {
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formatted, err := format.Source(src)
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if err != nil {
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// Should never happen, but can arise when developing this code.
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// The user can compile the output to see the error.
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log.Printf("warning: internal error: invalid Go generated: %s", err)
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log.Printf("warning: compile the package to analyze the error")
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return src
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}
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return formatted
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}
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