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Closes: #9 Adds support for `.slugignore` files. `prepare` will now only copy files which do not match any entry in the `.slugignore` file for a given `source-dir`. The logic is intended to follow logic similar to [this](https://github.com/heroku/slug-compiler/blob/68b63a30907f171e60f8398463d6bbd13b4ed178/lib/slug_compiler.rb#L131-L152): ```ruby lines = File.read(slugignore_path).split total = lines.inject(0) do |total, line| line = (line.split(/#/).first || "").strip if line.empty? total else globs = if line =~ /\// [File.join(build_dir, line)] else # 1.8.7 and 1.9.2 handle expanding ** differently, # where in 1.9.2 ** doesn't match the empty case. So # try empty ** explicitly ["", "**"].map { |g| File.join(build_dir, g, line) } end to_delete = Dir[*globs].uniq.map { |p| File.expand_path(p) } to_delete = to_delete.select { |p| p.match(/^#{build_dir}/) } to_delete.each { |p| FileUtils.rm_rf(p) } total + to_delete.size end end ``` Which as far as I can tell has not changes since Heroku closed-source their compiler, which can be verified by extracting the builder source from Heroku via a custom buildpack.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| // package slugignore implements Heroku-like .slugignore functionality for a | ||
| // given directory. | ||
| // | ||
| // Heroku's .slugignore format treats all non-empty and non comment lines | ||
| // (comment lines are those beginning with a # characted) as Ruby Dir globs, | ||
| package slugignore | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "errors" | ||
| "fmt" | ||
| "os" | ||
| "path/filepath" | ||
| "strings" | ||
|
|
||
| "github.com/bmatcuk/doublestar/v4" | ||
| ) | ||
|
|
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| // SlugIgnore is the interface for a parsed .slugignore file | ||
| // | ||
| // A given SlugIgnore is only applicable to the directory which contains the | ||
| // .slugignore file, at the time at which it was parsed. | ||
| type SlugIgnore interface { | ||
| IsIgnored(path string) bool | ||
| } | ||
|
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| // ForDirectory parses the .slugignore for a given directory. | ||
| // | ||
| // If there is no .slugignore file found, it returns a SlugIgnore which always | ||
| // returns false when IsIgnored is called. | ||
| func ForDirectory(dir string) (SlugIgnore, error) { | ||
| f, err := os.Open(filepath.Join(dir, ".slugignore")) | ||
| if err != nil { | ||
| if errors.Is(err, os.ErrNotExist) { | ||
| return &nullSlugIgnore{}, nil | ||
| } | ||
|
|
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| return nil, err | ||
| } | ||
| defer f.Close() | ||
|
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| s := bufio.NewScanner(bufio.NewReader(f)) | ||
| globs := []string{} | ||
|
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| for s.Scan() { | ||
| line := s.Text() | ||
| if strings.HasPrefix(line, "#") { | ||
| continue | ||
| } | ||
|
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| if strings.TrimSpace(line) == "" { | ||
| continue | ||
| } | ||
|
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| trimmed := strings.TrimPrefix(line, "/") | ||
| if strings.HasPrefix(line, "/") { | ||
| globs = append(globs, trimmed) | ||
| } else { | ||
| globs = append( | ||
| globs, | ||
| trimmed, | ||
| filepath.Join("**", trimmed), | ||
| ) | ||
| } | ||
| } | ||
| if err := s.Err(); err != nil { | ||
| return nil, fmt.Errorf("error parsing .slugignore: %w", err) | ||
| } | ||
|
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| ignored := map[string]struct{}{} | ||
| for _, glob := range globs { | ||
| if !doublestar.ValidatePattern(glob) { | ||
| return nil, fmt.Errorf("slugignore pattern is malformed: %v", glob) | ||
| } | ||
|
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| matches, err := doublestar.Glob(os.DirFS(dir), glob) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("error expanding glob %v: %w", glob, err) | ||
| } | ||
|
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| for _, match := range matches { | ||
| ignored[match] = struct{}{} | ||
| } | ||
| } | ||
|
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| return cache(ignored), nil | ||
| } | ||
|
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| type nullSlugIgnore struct{} | ||
|
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| func (*nullSlugIgnore) IsIgnored(path string) bool { | ||
| return false | ||
| } | ||
|
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| type cache map[string]struct{} | ||
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| func (c cache) IsIgnored(path string) bool { | ||
| path = strings.TrimPrefix(path, "/") | ||
|
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| for { | ||
| if _, ok := c[path]; ok { | ||
| return true | ||
| } | ||
|
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| path = filepath.Join(path, "..") | ||
|
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| if path == "." { | ||
| break | ||
| } | ||
| } | ||
|
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| return false | ||
| } |