feat: restructure code; add size and ext checks (#39)

- Refractor code
- Add file size and extension checkers
- Change repair workflow to use zurg

internal/utils/regex.go

@@ -0,0 +1,49 @@
+package utils
+
+import (
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+var (
+	VIDEOMATCH = "(?i)(\\.)(YUV|WMV|WEBM|VOB|VIV|SVI|ROQ|RMVB|RM|OGV|OGG|NSV|MXF|MPG|MPEG|M2V|MP2|MPE|MPV|MP4|M4P|M4V|MOV|QT|MNG|MKV|FLV|DRC|AVI|ASF|AMV|MKA|F4V|3GP|3G2|DIVX|X264|X265)$"
+	MUSICMATCH = "(?i)(\\.)(?:MP3|WAV|FLAC|AAC|OGG|WMA|AIFF|ALAC|M4A|APE|AC3|DTS|M4P|MID|MIDI|MKA|MP2|MPA|RA|VOC|WV|AMR)$"
+)
+
+var SAMPLEMATCH = `(?i)(^|[\\/]|[._-])(sample|trailer|thumb)s?([._-]|$)`
+
+func RegexMatch(regex string, value string) bool {
+	re := regexp.MustCompile(regex)
+	return re.MatchString(value)
+}
+
+func RemoveInvalidChars(value string) string {
+	return strings.Map(func(r rune) rune {
+		if r == filepath.Separator || r == ':' {
+			return r
+		}
+		if filepath.IsAbs(string(r)) {
+			return r
+		}
+		if strings.ContainsRune(filepath.VolumeName("C:"+string(r)), r) {
+			return r
+		}
+		if r < 32 || strings.ContainsRune(`<>:"/\|?*`, r) {
+			return -1
+		}
+		return r
+	}, value)
+}
+
+func RemoveExtension(value string) string {
+	re := regexp.MustCompile(VIDEOMATCH + "|" + SAMPLEMATCH + "|" + MUSICMATCH)
+
+	// Find the last index of the matched extension
+	loc := re.FindStringIndex(value)
+	if loc != nil {
+		return value[:loc[0]]
+	} else {
+		return value
+	}
+}