// // Black Friday Markdown Processor // Originally based on http://github.com/tanoku/upskirt // by Russ Ross // // // // Example front-end for command-line use // // package main import ( "flag" "fmt" "io/ioutil" "github.com/russross/blackfriday" "os" ) func main() { // parse command-line options var page, xhtml, latex, smartypants bool var css string var repeat int flag.BoolVar(&page, "page", false, "Generate a standalone HTML page (implies -latex=false)") flag.BoolVar(&xhtml, "xhtml", true, "Use XHTML-style tags in HTML output") flag.BoolVar(&latex, "latex", false, "Generate LaTeX output instead of HTML") flag.BoolVar(&smartypants, "smartypants", false, "Apply smartypants-style substitutions") flag.StringVar(&css, "css", "", "Link to a CSS stylesheet (implies -page)") flag.IntVar(&repeat, "repeat", 1, "Process the input multiple times (for benchmarking)") flag.Usage = func() { fmt.Fprintf(os.Stderr, "Usage:\n"+ " %s [options] [inputfile [outputfile]]\n\n"+ "Options:\n", os.Args[0]) flag.PrintDefaults() } flag.Parse() // enforce implied options if css != "" { page = true } if page { latex = false } // read the input var input []byte var err os.Error args := flag.Args() switch len(args) { case 0: if input, err = ioutil.ReadAll(os.Stdin); err != nil { fmt.Fprintln(os.Stderr, "Error reading from Stdin:", err) os.Exit(-1) } case 1, 2: if input, err = ioutil.ReadFile(args[0]); err != nil { fmt.Fprintln(os.Stderr, "Error reading from", args[0], ":", err) os.Exit(-1) } default: flag.Usage() os.Exit(-1) } // set up options var extensions uint32 extensions |= blackfriday.EXTENSION_NO_INTRA_EMPHASIS extensions |= blackfriday.EXTENSION_TABLES extensions |= blackfriday.EXTENSION_FENCED_CODE extensions |= blackfriday.EXTENSION_AUTOLINK extensions |= blackfriday.EXTENSION_STRIKETHROUGH extensions |= blackfriday.EXTENSION_SPACE_HEADERS var renderer *blackfriday.Renderer if latex { // render the data into LaTeX renderer = blackfriday.LatexRenderer(0) } else { // render the data into HTML html_flags := 0 if xhtml { html_flags |= blackfriday.HTML_USE_XHTML } if smartypants { html_flags |= blackfriday.HTML_USE_SMARTYPANTS html_flags |= blackfriday.HTML_SMARTYPANTS_FRACTIONS html_flags |= blackfriday.HTML_SMARTYPANTS_LATEX_DASHES } renderer = blackfriday.HtmlRenderer(html_flags) } // parse and render var output []byte for i := 0; i < repeat; i++ { output = blackfriday.Markdown(input, renderer, extensions) } // output the result var out *os.File if len(args) == 2 { if out, err = os.Create(args[1]); err != nil { fmt.Fprintf(os.Stderr, "Error creating %s: %v", args[1], err) os.Exit(-1) } defer out.Close() } else { out = os.Stdout } if page { ending := "" if xhtml { fmt.Fprint(out, "") fmt.Fprintln(out, "") ending = " /" } else { fmt.Fprint(out, "") fmt.Fprintln(out, "") } fmt.Fprintln(out, "") fmt.Fprintln(out, " ") fmt.Fprintf(out, " \n", ending) fmt.Fprintf(out, " \n", ending) if css != "" { fmt.Fprintf(out, " \n", css) } fmt.Fprintln(out, "") fmt.Fprintln(out, "") } if _, err = out.Write(output); err != nil { fmt.Fprintln(os.Stderr, "Error writing output:", err) os.Exit(-1) } if page { fmt.Fprintln(out, "") fmt.Fprintln(out, "") } }