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|
package konghcl
import (
"fmt"
"sort"
"strings"
"github.com/alecthomas/kong"
)
var (
// DumpIgnoreFlags specifies a set of flags that should not be dumped.
DumpIgnoreFlags = map[string]bool{
"help": true, "version": true, "dump-config": true, "env": true, "validate-config": true,
}
)
// DumpConfig can be added as a flag to dump HCL configuration.
type DumpConfig bool
func (f DumpConfig) BeforeApply(app *kong.Kong) error { // nolint: golint
groups := map[string][]*kong.Flag{}
standalone := []*kong.Flag{}
for _, flags := range app.Model.AllFlags(true) {
for _, flag := range flags {
if DumpIgnoreFlags[flag.Name] {
continue
}
parts := strings.SplitN(flag.Name, "-", 2)
if len(parts) == 1 {
standalone = append(standalone, flag)
} else {
groups[parts[0]] = append(groups[parts[0]], flag)
}
}
}
// Write non-grouped flags out at the top.
for key, flags := range groups {
if len(flags) == 1 {
standalone = append(standalone, flags...)
delete(groups, key)
}
}
// Alphabetical ordering.
sort.Slice(standalone, func(i, j int) bool {
return standalone[i].Name < standalone[j].Name
})
for _, flag := range standalone {
formatFlag("", flag, false)
fmt.Println()
}
delete(groups, "")
// Alphabetically order the groups.
keys := []string{}
for key := range groups {
keys = append(keys, key)
}
sort.Strings(keys)
for block := range groups {
flags := groups[block]
if len(flags) == 1 {
formatFlag("", flags[0], false)
fmt.Println()
continue
}
fmt.Printf("%s {\n", block)
for i, flag := range flags {
if i != 0 {
fmt.Println()
}
formatFlag(" ", flag, true)
}
fmt.Printf("}\n\n")
}
app.Exit(0)
return nil
}
func formatFlag(indent string, flag *kong.Flag, grouped bool) {
fmt.Printf("%s// %s\n", indent, flag.Help)
fmt.Print(indent)
if grouped {
parts := strings.SplitN(flag.Name, "-", 2)
fmt.Printf("%s = ", parts[1])
} else {
fmt.Printf("%s = ", flag.Name)
}
switch {
case flag.IsSlice():
fmt.Println("[ ... ]")
case flag.IsMap():
fmt.Println("{ ... }")
default:
fmt.Println(flag.FormatPlaceHolder())
}
}
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