package main import ( "bufio" "flag" "fmt" "os" "os/exec" "strings" "unicode/utf8" "github.com/gobwas/glob" "github.com/gobwas/glob/match" ) func main() { var ( pattern = flag.String("p", "", "pattern to draw") sep = flag.String("s", "", "comma separated list of separators characters") filepath = flag.String("file", "", "path for patterns file") auto = flag.Bool("auto", false, "autoopen result") offset = flag.Int("offset", 0, "patterns to skip") ) flag.Parse() var patterns []string if *pattern != "" { patterns = append(patterns, *pattern) } if *filepath != "" { file, err := os.Open(*filepath) if err != nil { fmt.Printf("could not open file: %v\n", err) os.Exit(1) } s := bufio.NewScanner(file) for s.Scan() { fmt.Println(*offset) if *offset > 0 { *offset-- fmt.Println("skipped") continue } patterns = append(patterns, s.Text()) } file.Close() } if len(patterns) == 0 { return } var separators []rune if len(*sep) > 0 { for _, c := range strings.Split(*sep, ",") { r, w := utf8.DecodeRuneInString(c) if len(c) > w { fmt.Printf("only single charactered separators are allowed: %+q\n", c) os.Exit(1) } separators = append(separators, r) } } br := bufio.NewReader(os.Stdin) for _, p := range patterns { g, err := glob.Compile(p, separators...) if err != nil { fmt.Printf("could not compile pattern %+q: %v\n", p, err) os.Exit(1) } s := match.Graphviz(p, g.(match.Matcher)) if *auto { fmt.Fprintf(os.Stdout, "pattern: %+q: ", p) if err := open(s); err != nil { fmt.Printf("could not open graphviz: %v", err) os.Exit(1) } if !next(br) { return } } else { fmt.Fprintln(os.Stdout, s) } } } func open(s string) error { file, err := os.Create("glob.graphviz.png") if err != nil { return err } defer file.Close() cmd := exec.Command("dot", "-Tpng") cmd.Stdin = strings.NewReader(s) cmd.Stdout = file if err := cmd.Run(); err != nil { return err } if err := file.Sync(); err != nil { return err } cmd = exec.Command("open", file.Name()) return cmd.Run() } func next(in *bufio.Reader) bool { fmt.Fprint(os.Stdout, "cancel? [Y/n]: ") p, err := in.ReadBytes('\n') if err != nil { return false } if p[0] == 'Y' { return false } return true }