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package main |
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import ( |
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"encoding/json" |
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"errors" |
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"os" |
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"path/filepath" |
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) |
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var ErrNotFound = errors.New("word not found") |
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type Cache struct { |
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dir string |
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} |
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func NewCache() (*Cache, error) { |
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home, err := os.UserHomeDir() |
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if err != nil { |
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return nil, err |
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} |
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dir := filepath.Join(home, ".cache", "anpi") |
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if err := os.MkdirAll(dir, 0o755); err != nil { |
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return nil, err |
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} |
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return &Cache{dir: dir}, nil |
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} |
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func (c *Cache) path(word string) string { |
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return filepath.Join(c.dir, word+".json") |
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} |
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func (c *Cache) notfoundPath(word string) string { |
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return filepath.Join(c.dir, word+".notfound") |
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} |
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func (c *Cache) Read(word string) (*Entry, error) { |
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if _, err := os.Stat(c.notfoundPath(word)); err == nil { |
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return nil, ErrNotFound |
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} |
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p := c.path(word) |
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f, err := os.Open(p) |
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if err != nil { |
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return nil, err |
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} |
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defer f.Close() //nolint:errcheck |
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var e Entry |
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if err := json.NewDecoder(f).Decode(&e); err != nil { |
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return nil, err |
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} |
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return &e, nil |
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} |
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func (c *Cache) Write(word string, e *Entry, found bool) error { |
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if !found { |
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f, err := os.Create(c.notfoundPath(word)) |
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if err != nil { |
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return err |
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} |
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return f.Close() |
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} |
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p := c.path(word) |
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f, err := os.Create(p) |
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if err != nil { |
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return err |
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} |
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defer f.Close() //nolint:errcheck |
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return json.NewEncoder(f).Encode(e) |
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} |
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func (c *Cache) Clear(word string) error { |
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_ = os.Remove(c.notfoundPath(word)) |
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return os.Remove(c.path(word)) |
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} |