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package main
import (
"encoding/json"
"fmt"
"maps"
"os"
"slices"
"strconv"
"strings"
)
func main() {
if len(os.Args) != 3 {
fmt.Fprintf(os.Stderr, "usage: %s <json_path> <out_path>\n", os.Args[0])
os.Exit(1)
}
jsonPath := os.Args[1]
outPath := os.Args[2]
jsonData, err := os.ReadFile(jsonPath)
if err != nil {
fmt.Fprintf(os.Stderr, "error reading file %s: %v\n", jsonPath, err)
os.Exit(1)
}
// It would be nice to preserve the order of blocks ... except that we can't
// because Nix already doesn't preserve the order of attribute sets.
var config map[string]any
if err := json.Unmarshal(jsonData, &config); err != nil {
fmt.Fprintf(os.Stderr, "error parsing JSON: %v\n", err)
os.Exit(1)
}
result := formatConfig(config)
if err := os.WriteFile(outPath, []byte(result), 0644); err != nil {
fmt.Fprintf(os.Stderr, "error writing file %s: %v\n", outPath, err)
os.Exit(1)
}
}
func formatConfig(config map[string]any) string {
var s strings.Builder
for _, blockName := range slices.Sorted(maps.Keys(config)) {
labels := config[blockName]
if labelsMap, ok := labels.(map[string]any); ok {
for label, block := range labelsMap {
if blockMap, ok := block.(map[string]any); ok {
s.WriteString(formatBlock(blockName, label, blockMap, 0))
}
}
}
}
return s.String()
}
func formatBlock(blockName string, label string, block map[string]any, indent int) string {
var s strings.Builder
s.WriteString(strings.Repeat(" ", indent))
s.WriteString(blockName)
if label != "" {
s.WriteString(fmt.Sprintf(` %s`, strconv.Quote(label)))
}
s.WriteString(" {\n")
var blocks []any
if blocksValue, exists := block["blocks"]; exists {
if blocksList, ok := blocksValue.([]any); ok {
blocks = blocksList
}
delete(block, "blocks")
}
for _, key := range slices.Sorted(maps.Keys(block)) {
s.WriteString(strings.Repeat(" ", indent+1))
s.WriteString(fmt.Sprintf("%s = %s\n", key, formatValue(block[key])))
}
for _, blockItem := range blocks {
if blockMap, ok := blockItem.(map[string]any); ok {
var name string
if nameValue, exists := blockMap["name"]; exists {
if nameStr, ok := nameValue.(string); ok {
name = nameStr
}
delete(blockMap, "name")
}
s.WriteString(formatBlock(name, "", blockMap, indent+1))
}
}
s.WriteString(strings.Repeat(" ", indent))
s.WriteString("}\n")
return s.String()
}
func formatValue(value any) string {
switch v := value.(type) {
case string:
return strconv.Quote(v)
case map[string]any:
if ref, exists := v["$ref"]; exists {
if refStr, ok := ref.(string); ok {
return refStr
}
}
var parts []string
for _, name := range slices.Sorted(maps.Keys(v)) {
parts = append(parts, fmt.Sprintf("%s=%s,", name, formatValue(v[name])))
}
return "{" + strings.Join(parts, " ") + "}"
case []any:
var parts []string
for _, item := range v {
parts = append(parts, formatValue(item))
}
return "[" + strings.Join(parts, ", ") + "]"
default:
return fmt.Sprintf("%v", v)
}
}
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