59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
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// Package contains utility functions and types related to (un)marshaling JSON.
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package jsonutil
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import (
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"encoding/json"
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"fmt"
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"io"
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"os"
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)
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// LoadFile reads the file at the given path and unmarshals it into the
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// given pointer.
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func LoadFile(into any, path string) error {
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file, err := os.Open(path)
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if err != nil {
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return fmt.Errorf("opening file: %w", err)
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}
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defer file.Close()
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if err = json.NewDecoder(file).Decode(into); err != nil {
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return fmt.Errorf("decoding json: %w", err)
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}
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return nil
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}
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// WriteFile encodes the given data as a JSON document, and writes it to the
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// given file path, overwriting any previous data.
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func WriteFile(data any, path string, fileMode os.FileMode) error {
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file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fileMode)
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if err != nil {
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return fmt.Errorf("opening file: %w", err)
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}
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defer file.Close()
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if err = json.NewEncoder(file).Encode(data); err != nil {
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return fmt.Errorf("writing/encoding file: %w", err)
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}
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return nil
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}
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// WriteIndented is a helper which calls json.MarshalIndent on the given
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// value and writes the result to the given io.Writer.
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func WriteIndented(into io.Writer, v any) error {
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b, err := json.MarshalIndent(v, "", " ")
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if err != nil {
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return fmt.Errorf("json marshaling: %w", err)
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}
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if _, err := os.Stdout.Write(b); err != nil {
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return fmt.Errorf("writing: %w", err)
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}
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return nil
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}
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