43 lines
1.1 KiB
Go
43 lines
1.1 KiB
Go
 
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package node
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import (
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"encoding/json"
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"fmt"
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"os"
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"strings"
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)
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// ReadVersion returns the version field from a package.json file.
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func ReadVersion(path string) (string, error) {
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data, err := os.ReadFile(path)
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if err != nil {
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return "", fmt.Errorf("read %s: %w", path, err)
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}
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var pkg struct {
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Version string `json:"version"`
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}
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if err := json.Unmarshal(data, &pkg); err != nil {
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return "", fmt.Errorf("parse %s: %w", path, err)
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}
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if pkg.Version == "" {
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return "", fmt.Errorf("no version field in %s", path)
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}
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return pkg.Version, nil
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}
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// WriteVersion replaces the version field in a package.json file in-place.
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// oldVersion must match what ReadVersion returned. Formatting is preserved.
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func WriteVersion(path, oldVersion, newVersion string) error {
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data, err := os.ReadFile(path)
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if err != nil {
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return fmt.Errorf("read %s: %w", path, err)
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}
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old := `"version": "` + oldVersion + `"`
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repl := `"version": "` + newVersion + `"`
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if !strings.Contains(string(data), old) {
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return fmt.Errorf("version %q not found in %s", oldVersion, path)
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}
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updated := strings.Replace(string(data), old, repl, 1)
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return os.WriteFile(path, []byte(updated), 0644)
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}
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