c4ebd80669
Implements conf.Load to populate tagged structs from a chain of Sources (env, .env, YAML/JSON/TOML, custom). Supports default values, slice separators, nested structs, pointer fields, and a Validator hook. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
44 lines
1 KiB
Go
44 lines
1 KiB
Go
package conf
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import (
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"fmt"
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"strings"
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)
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// flatten walks a nested map[string]any (as produced by yaml/json/toml decoders)
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// and returns a flat key->string map. Keys are uppercased and joined with "_".
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// Scalar values are stringified via fmt.Sprint. Slices are joined with ",".
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func flatten(in map[string]any) map[string]string {
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out := map[string]string{}
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flattenInto(out, "", in)
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return out
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}
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func flattenInto(out map[string]string, prefix string, in map[string]any) {
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for k, v := range in {
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key := strings.ToUpper(k)
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if prefix != "" {
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key = prefix + "_" + key
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}
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switch x := v.(type) {
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case map[string]any:
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flattenInto(out, key, x)
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case map[any]any: // yaml.v3 with non-string keys
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m := make(map[string]any, len(x))
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for kk, vv := range x {
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m[fmt.Sprint(kk)] = vv
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}
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flattenInto(out, key, m)
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case []any:
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parts := make([]string, len(x))
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for i, e := range x {
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parts[i] = fmt.Sprint(e)
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}
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out[key] = strings.Join(parts, ",")
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case nil:
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// skip
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default:
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out[key] = fmt.Sprint(x)
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}
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}
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}
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