mirror of https://github.com/coder/coder.git
174 lines
4.4 KiB
Go
174 lines
4.4 KiB
Go
package clibase
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import (
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"os"
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"github.com/hashicorp/go-multierror"
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"github.com/spf13/pflag"
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"golang.org/x/xerrors"
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)
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// Option is a configuration option for a CLI application.
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type Option struct {
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Name string `json:"name,omitempty"`
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Description string `json:"description,omitempty"`
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// Flag is the long name of the flag used to configure this option. If unset,
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// flag configuring is disabled.
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Flag string `json:"flag,omitempty"`
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// FlagShorthand is the one-character shorthand for the flag. If unset, no
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// shorthand is used.
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FlagShorthand string `json:"flag_shorthand,omitempty"`
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// Env is the environment variable used to configure this option. If unset,
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// environment configuring is disabled.
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Env string `json:"env,omitempty"`
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// YAML is the YAML key used to configure this option. If unset, YAML
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// configuring is disabled.
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YAML string `json:"yaml,omitempty"`
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// Default is parsed into Value if set.
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Default string `json:"default,omitempty"`
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// Value includes the types listed in values.go.
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Value pflag.Value `json:"value,omitempty"`
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// Annotations enable extensions to clibase higher up in the stack. It's useful for
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// help formatting and documentation generation.
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Annotations Annotations `json:"annotations,omitempty"`
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// Group is a group hierarchy that helps organize this option in help, configs
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// and other documentation.
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Group *Group `json:"group,omitempty"`
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// UseInstead is a list of options that should be used instead of this one.
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// The field is used to generate a deprecation warning.
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UseInstead []Option `json:"use_instead,omitempty"`
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Hidden bool `json:"hidden,omitempty"`
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}
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// OptionSet is a group of options that can be applied to a command.
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type OptionSet []Option
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// Add adds the given Options to the OptionSet.
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func (s *OptionSet) Add(opts ...Option) {
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*s = append(*s, opts...)
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}
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// FlagSet returns a pflag.FlagSet for the OptionSet.
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func (s *OptionSet) FlagSet() *pflag.FlagSet {
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if s == nil {
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return &pflag.FlagSet{}
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}
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fs := pflag.NewFlagSet("", pflag.ContinueOnError)
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for _, opt := range *s {
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if opt.Flag == "" {
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continue
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}
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var noOptDefValue string
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{
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no, ok := opt.Value.(NoOptDefValuer)
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if ok {
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noOptDefValue = no.NoOptDefValue()
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}
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}
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val := opt.Value
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if val == nil {
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val = DiscardValue
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}
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fs.AddFlag(&pflag.Flag{
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Name: opt.Flag,
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Shorthand: opt.FlagShorthand,
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Usage: opt.Description,
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Value: val,
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DefValue: "",
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Changed: false,
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Deprecated: "",
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NoOptDefVal: noOptDefValue,
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Hidden: opt.Hidden,
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})
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}
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fs.Usage = func() {
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_, _ = os.Stderr.WriteString("Override (*FlagSet).Usage() to print help text.\n")
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}
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return fs
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}
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// ParseEnv parses the given environment variables into the OptionSet.
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// Use EnvsWithPrefix to filter out prefixes.
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func (s *OptionSet) ParseEnv(vs []EnvVar) error {
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if s == nil {
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return nil
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}
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var merr *multierror.Error
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// We parse environment variables first instead of using a nested loop to
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// avoid N*M complexity when there are a lot of options and environment
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// variables.
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envs := make(map[string]string)
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for _, v := range vs {
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envs[v.Name] = v.Value
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}
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for _, opt := range *s {
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if opt.Env == "" {
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continue
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}
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envVal, ok := envs[opt.Env]
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// Currently, empty values are treated as if the environment variable is
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// unset. This behavior is technically not correct as there is now no
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// way for a user to change a Default value to an empty string from
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// the environment. Unfortunately, we have old configuration files
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// that rely on the faulty behavior.
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if !ok || envVal == "" {
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continue
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}
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if err := opt.Value.Set(envVal); err != nil {
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merr = multierror.Append(
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merr, xerrors.Errorf("parse %q: %w", opt.Name, err),
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)
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}
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}
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return merr.ErrorOrNil()
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}
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// SetDefaults sets the default values for each Option.
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// It should be called before all parsing (e.g. ParseFlags, ParseEnv).
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func (s *OptionSet) SetDefaults() error {
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if s == nil {
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return nil
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}
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var merr *multierror.Error
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for _, opt := range *s {
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if opt.Default == "" {
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continue
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}
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if opt.Value == nil {
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merr = multierror.Append(
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merr,
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xerrors.Errorf(
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"parse %q: no Value field set\nFull opt: %+v",
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opt.Name, opt,
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),
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)
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continue
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}
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if err := opt.Value.Set(opt.Default); err != nil {
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merr = multierror.Append(
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merr, xerrors.Errorf("parse %q: %w", opt.Name, err),
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)
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}
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}
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return merr.ErrorOrNil()
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}
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