58 lines
1.1 KiB
Go
58 lines
1.1 KiB
Go
// Copyright (C) 2014 The Syncthing Authors.
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//
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// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this file,
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// You can obtain one at https://mozilla.org/MPL/2.0/.
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package main
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import (
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"bytes"
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"flag"
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"fmt"
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"io"
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"text/tabwriter"
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)
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func optionTable(w io.Writer, rows [][]string) {
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tw := tabwriter.NewWriter(w, 2, 4, 2, ' ', 0)
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for _, row := range rows {
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for i, cell := range row {
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if i > 0 {
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tw.Write([]byte("\t"))
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}
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tw.Write([]byte(cell))
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}
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tw.Write([]byte("\n"))
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}
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tw.Flush()
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}
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func usageFor(fs *flag.FlagSet, usage string, extra string) func() {
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return func() {
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var b bytes.Buffer
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b.WriteString("Usage:\n " + usage + "\n")
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var options [][]string
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fs.VisitAll(func(f *flag.Flag) {
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var opt = " -" + f.Name
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if f.DefValue != "false" {
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opt += "=" + fmt.Sprintf(`"%s"`, f.DefValue)
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}
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options = append(options, []string{opt, f.Usage})
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})
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if len(options) > 0 {
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b.WriteString("\nOptions:\n")
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optionTable(&b, options)
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}
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fmt.Println(b.String())
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if len(extra) > 0 {
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fmt.Println(extra)
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}
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}
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}
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