Implemented text formatting

Render.go

@@ -122,18 +122,20 @@ func (r *renderer) processLine(line string) {
 			return
 		}
 
-		line = strings.TrimSpace(line[1:])
+		if len(line) > 1 && line[1] == ' ' {
+			line = line[2:]
 
-		if r.listLevel == 0 {
-			r.WriteString("<ul>")
-			r.listLevel++
+			if r.listLevel == 0 {
+				r.WriteString("<ul>")
+				r.listLevel++
+			}
+
+			r.WriteString("<li>")
+			r.writeText(line)
+			r.WriteString("</li>")
+			return
 		}
 
-		r.WriteString("<li>")
-		r.writeText(line)
-		r.WriteString("</li>")
-		return
-
 	case '`':
 		if strings.HasPrefix(line, "```") {
 			language := line[3:]
@@ -255,12 +257,14 @@ func (r *renderer) writeText(markdown string) {
 		textStart   = -1
 		textEnd     = -1
 		urlStart    = -1
-		parentheses = 0
 		codeStart   = -1
+		emStart     = -1
+		strongStart = -1
+		parentheses = 0
 	)
 
 	for {
-		if i == len(markdown) {
+		if i >= len(markdown) {
 			r.WriteString(html.EscapeString(markdown[tokenStart:]))
 			return
 		}
@@ -315,6 +319,30 @@ func (r *renderer) writeText(markdown string) {
 				tokenStart = i
 				codeStart = i + 1
 			}
+
+		case '*', '_':
+			if i == emStart {
+				strongStart = i + 1
+				emStart = -1
+			} else if strongStart != -1 {
+				r.WriteString("<strong>")
+				r.WriteString(html.EscapeString(markdown[strongStart:i]))
+				r.WriteString("</strong>")
+				strongStart = -1
+
+				i++
+				tokenStart = i + 1
+			} else if emStart != -1 {
+				r.WriteString("<em>")
+				r.WriteString(html.EscapeString(markdown[emStart:i]))
+				r.WriteString("</em>")
+				emStart = -1
+				tokenStart = i + 1
+			} else {
+				r.WriteString(html.EscapeString(markdown[tokenStart:i]))
+				tokenStart = i
+				emStart = i + 1
+			}
 		}
 
 		i++