sync: import files in markdown, relative to theme/exercice dir

admin/sync/markdown.go

@@ -0,0 +1,66 @@
+package sync
+
+import (
+	"bufio"
+	"encoding/base32"
+	"log"
+	"os"
+	"path"
+	"regexp"
+	"strings"
+
+	"srs.epita.fr/fic-server/libfic"
+
+	"golang.org/x/crypto/blake2b"
+	"gopkg.in/russross/blackfriday.v2"
+)
+
+func ProcessMarkdown(i Importer, input string, rootDir string) (output string) {
+	// Define the path where save linked files
+	hash := blake2b.Sum512([]byte(rootDir))
+	absPath := "$FILES$/" + strings.ToLower(base32.StdEncoding.WithPadding(base32.NoPadding).EncodeToString(hash[:]))
+
+	// Process md
+	output = string(blackfriday.Run(
+		[]byte(input),
+		blackfriday.WithRenderer(blackfriday.NewHTMLRenderer(
+			blackfriday.HTMLRendererParameters{
+				AbsolutePrefix: absPath,
+				Flags: blackfriday.CommonHTMLFlags,
+			},
+		)),
+	))
+
+	// Import files
+	re, err := regexp.Compile(strings.Replace(absPath, "$", "\\$", -1) + "/[^\"]+")
+	if err != nil {
+		log.Println("Unable to compile regexp:", err)
+		return
+	}
+	files := re.FindAllString(output, -1)
+
+	for _, filePath := range files {
+		iPath := strings.TrimPrefix(filePath, absPath)
+		dPath := path.Join(fic.FilesDir, strings.ToLower(base32.StdEncoding.WithPadding(base32.NoPadding).EncodeToString(hash[:])), iPath)
+
+		if err := os.MkdirAll(path.Dir(dPath), 0755); err != nil {
+			log.Println("Unable to make directories:", err)
+			return
+		}
+
+		if fdto, err := os.Create(dPath); err != nil {
+			log.Println("Unable to create destination file:", err)
+			return
+		} else {
+			defer fdto.Close()
+			writer := bufio.NewWriter(fdto)
+			if err := getFile(i, rootDir + iPath, writer); err != nil {
+				os.Remove(dPath)
+				log.Println("Unable to create destination file:", err)
+				return
+			}
+		}
+	}
+
+	return
+}