Alec Thomas
ab5cf7e6ef
* Add tracing to the parser. * Synthesize a --help flag. * Parsing now occurs in multiple phases. 1. Reset target. 2. Parse command-line into a "trace" (no values are written to target). 3. Apply traced, parsed values to the target fields. This is another step in facilitating context-sensitive help and completion. * Detect duplicate flags.
34 lines
555 B
Go
34 lines
555 B
Go
package kong
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import (
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"io"
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"text/template"
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)
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const defaultHelp = `{{- with .Application -}}
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usage: {{.Name}}
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{{.Help}}
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{{range .Flags}}
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--{{.Name}}
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{{end}}
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{{- end -}}
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`
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var defaultHelpTemplate = template.Must(template.New("help").Parse(defaultHelp))
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// WriteHelp to w. If w is nil, the default stdout writer will be used.
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func (k *Kong) WriteHelp(w io.Writer) error {
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if w == nil {
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w = k.stdout
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}
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ctx := map[string]interface{}{
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"Application": k.Model,
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}
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for k, v := range k.helpContext {
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ctx[k] = v
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}
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return k.help.Execute(w, ctx)
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}
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