115 lines
2.4 KiB
Go
115 lines
2.4 KiB
Go
package flags
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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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"strings"
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text "github.com/kr/text"
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)
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func Usage(txt string, flags *flag.FlagSet) string {
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u := &Usager{
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Usage: txt,
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Flags: flags,
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}
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return u.String()
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}
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type Usager struct {
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Usage string
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Flags *flag.FlagSet
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}
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func (u *Usager) String() string {
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out := new(bytes.Buffer)
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out.WriteString(strings.TrimSpace(u.Usage))
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out.WriteString("\n")
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out.WriteString("\n")
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if u.Flags != nil {
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f := &HTTPFlags{}
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clientFlags := f.ClientFlags()
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serverFlags := f.ServerFlags()
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var httpFlags, cmdFlags *flag.FlagSet
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u.Flags.VisitAll(func(f *flag.Flag) {
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if contains(clientFlags, f) || contains(serverFlags, f) {
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if httpFlags == nil {
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httpFlags = flag.NewFlagSet("", flag.ContinueOnError)
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}
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httpFlags.Var(f.Value, f.Name, f.Usage)
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} else {
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if cmdFlags == nil {
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cmdFlags = flag.NewFlagSet("", flag.ContinueOnError)
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}
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cmdFlags.Var(f.Value, f.Name, f.Usage)
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}
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})
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if httpFlags != nil {
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printTitle(out, "HTTP API Options")
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httpFlags.VisitAll(func(f *flag.Flag) {
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printFlag(out, f)
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})
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}
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if cmdFlags != nil {
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printTitle(out, "Command Options")
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cmdFlags.VisitAll(func(f *flag.Flag) {
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printFlag(out, f)
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})
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}
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}
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return strings.TrimRight(out.String(), "\n")
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}
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// printTitle prints a consistently-formatted title to the given writer.
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func printTitle(w io.Writer, s string) {
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fmt.Fprintf(w, "%s\n\n", s)
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}
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// printFlag prints a single flag to the given writer.
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func printFlag(w io.Writer, f *flag.Flag) {
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example, _ := flag.UnquoteUsage(f)
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if example != "" {
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fmt.Fprintf(w, " -%s=<%s>\n", f.Name, example)
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} else {
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fmt.Fprintf(w, " -%s\n", f.Name)
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}
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indented := wrapAtLength(f.Usage, 5)
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fmt.Fprintf(w, "%s\n\n", indented)
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}
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// contains returns true if the given flag is contained in the given flag
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// set or false otherwise.
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func contains(fs *flag.FlagSet, f *flag.Flag) bool {
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if fs == nil {
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return false
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}
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var in bool
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fs.VisitAll(func(hf *flag.Flag) {
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in = in || f.Name == hf.Name
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})
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return in
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}
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// maxLineLength is the maximum width of any line.
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const maxLineLength int = 72
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// wrapAtLength wraps the given text at the maxLineLength, taking into account
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// any provided left padding.
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func wrapAtLength(s string, pad int) string {
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wrapped := text.Wrap(s, maxLineLength-pad)
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lines := strings.Split(wrapped, "\n")
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for i, line := range lines {
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lines[i] = strings.Repeat(" ", pad) + line
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}
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return strings.Join(lines, "\n")
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}
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