account for images and expand readme

README.md

@@ -28,3 +28,20 @@ Usage of ./md2gmi:
     go get github.com/n0x1m/md2gmi
     cat file.md | md2gmi
     md2gmi -in file.md -out file.gmi
+
+The top part of this readme parses to
+
+```md
+## md2gmi
+
+Convert Markdown to Gemini gemtext[1] markup with Go. Working with streams and pipes for UNIX like behavior utilizing Go channels. Processing streams line by line is deliberately slightly more challenging than it needs to be to play around with go state machines.
+
+=> https://gemini.circumlunar.space/docs/gemtext.gmi 1: gemtext
+
+ See the gemini protocol[1] and the protocol spec[2].
+
+=> https://gemini.circumlunar.space/ 1: gemini protocol
+=> https://gemini.circumlunar.space/docs/specification.gmi 2: protocol spec
+
+Internally md2gmi does a 1st pass that constructs the core layout for gemtext. This is then streamed to the 2nd pass line by line. The 2nd pass will convert links and stream line by line to the output.
+```

proc.go

@@ -29,7 +29,7 @@ func (m *proc) Process(in chan []byte) chan []byte {
 func (m *proc) process(data []byte) []byte {
 	// find link name and url
 	var buffer []byte
-	re := regexp.MustCompile(`\[([^\]*]*)\]\(([^)]*)\)`)
+	re := regexp.MustCompile(`!?\[([^\]*]*)\]\(([^)]*)\)`)
 	for i, match := range re.FindAllSubmatch(data, -1) {
 		replaceWithIndex := append(match[1], fmt.Sprintf("[%d]", i+1)...)
 		data = bytes.Replace(data, match[0], replaceWithIndex, 1)