1// Copyright 2014 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5//go:build ignore
6
7package main
8
9import (
10	"bytes"
11	"fmt"
12	"log"
13	"os"
14	"strings"
15)
16
17var gooses []string
18
19func main() {
20	data, err := os.ReadFile("../../go/build/syslist.go")
21	if err != nil {
22		log.Fatal(err)
23	}
24	const goosPrefix = `var knownOS = map[string]bool{`
25	inGOOS := false
26	for _, line := range strings.Split(string(data), "\n") {
27		if strings.HasPrefix(line, goosPrefix) {
28			inGOOS = true
29		} else if inGOOS && strings.HasPrefix(line, "}") {
30			break
31		} else if inGOOS {
32			goos := strings.Fields(line)[0]
33			goos = strings.TrimPrefix(goos, `"`)
34			goos = strings.TrimSuffix(goos, `":`)
35			gooses = append(gooses, goos)
36		}
37	}
38
39	for _, target := range gooses {
40		if target == "nacl" {
41			continue
42		}
43		var tags []string
44		if target == "linux" {
45			tags = append(tags, "!android") // must explicitly exclude android for linux
46		}
47		if target == "solaris" {
48			tags = append(tags, "!illumos") // must explicitly exclude illumos for solaris
49		}
50		if target == "darwin" {
51			tags = append(tags, "!ios") // must explicitly exclude ios for darwin
52		}
53		tags = append(tags, target) // must explicitly include target for bootstrapping purposes
54		var buf bytes.Buffer
55		fmt.Fprintf(&buf, "// Code generated by gengoos.go using 'go generate'. DO NOT EDIT.\n\n")
56		fmt.Fprintf(&buf, "//go:build %s\n\n", strings.Join(tags, " && "))
57		fmt.Fprintf(&buf, "package goos\n\n")
58		fmt.Fprintf(&buf, "const GOOS = `%s`\n\n", target)
59		for _, goos := range gooses {
60			value := 0
61			if goos == target {
62				value = 1
63			}
64			fmt.Fprintf(&buf, "const Is%s = %d\n", strings.Title(goos), value)
65		}
66		err := os.WriteFile("zgoos_"+target+".go", buf.Bytes(), 0666)
67		if err != nil {
68			log.Fatal(err)
69		}
70	}
71}
72