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6fb316f5ed
This renames the package+symbols in the earlier 17ffa8013835d4 to be
in their own package ("buildfeatures") and start with the word "Has"
like "if buildfeatures.HasFoo {".
Updates #12614
Change-Id: I510e5f65993e5b76a0e163e3aa4543755213cbf6
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
50 lines
1.4 KiB
Go
50 lines
1.4 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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//go:build ignore
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// The gens.go program generates the feature_<feature>_enabled.go
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// and feature_<feature>_disabled.go files for each feature tag.
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package main
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import (
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"cmp"
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"fmt"
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"os"
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"strings"
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"tailscale.com/feature/featuretags"
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"tailscale.com/util/must"
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)
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const header = `// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Code g|e|n|e|r|a|t|e|d by gen.go; D|O N|OT E|D|I|T.
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`
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func main() {
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header := strings.ReplaceAll(header, "|", "") // to avoid this file being marked as generated
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for k, m := range featuretags.Features {
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if !k.IsOmittable() {
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continue
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}
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sym := "Has" + cmp.Or(m.Sym, strings.ToUpper(string(k)[:1])+string(k)[1:])
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for _, suf := range []string{"enabled", "disabled"} {
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bang := ""
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if suf == "enabled" {
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bang = "!" // !ts_omit_...
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}
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must.Do(os.WriteFile("feature_"+string(k)+"_"+suf+".go",
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fmt.Appendf(nil, "%s//go:build %s%s\n\npackage buildfeatures\n\n"+
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"// %s is whether the binary was built with support for modular feature %q.\n"+
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"// Specifically, it's whether the binary was NOT built with the %q build tag.\n"+
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"// It's a const so it can be used for dead code elimination.\n"+
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"const %s = %t\n",
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header, bang, k.OmitTag(), sym, m.Desc, k.OmitTag(), sym, suf == "enabled"), 0644))
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}
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}
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}
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