seems to work, but might need unit tests

main.go

@@ -10,9 +10,10 @@ import (
 )
 
 type heading struct {
-	text  string
+	text   string
-	level int
+	level  int
-	line  int
+	line   int
+	parent *heading
 }
 
 func is_heading(line string) bool {
@@ -31,29 +32,45 @@ func get_heading_level(heading_text string) int {
 	return level
 }
 
-func count_levels(headings []heading) map[int]int {
+func count_levels(headings []heading) [6]int {
-	level_count := make(map[int]int)
+	level_count := [6]int{}
 
 	for index, _ := range headings {
 		switch headings[index].level {
 		case 1:
-			level_count[1]++
+			level_count[0]++
 		case 2:
-			level_count[2]++
+			level_count[1]++
 		case 3:
-			level_count[3]++
+			level_count[2]++
 		case 4:
-			level_count[4]++
+			level_count[3]++
 		case 5:
-			level_count[5]++
+			level_count[4]++
 		case 6:
-			level_count[6]++
+			level_count[5]++
 		}
 	}
 
 	return level_count
 }
 
+func get_parents(headings []heading) {
+	for index, _ := range headings {
+		if index == 0 {
+			headings[index].parent = nil
+			continue
+		}
+
+		for i := (index - 1); i >= 0; i-- {
+			if headings[i].level < headings[index].level {
+				headings[index].parent = &headings[i]
+				break
+			}
+		}
+	}
+}
+
 func main() {
 	file_content_raw, err := os.ReadFile(os.Args[1])
 
@@ -70,17 +87,19 @@ func main() {
 	for index, value := range file_lines {
 		if is_heading(value) {
 			headings = append(
-				headings, heading{value, get_heading_level(value), (index + 1)})
+				headings, heading{value, get_heading_level(value), (index + 1), nil})
 		}
 	}
 
+	get_parents(headings)
+
 	fmt.Printf("%v\n", headings)
 
 	header_level_count := count_levels(headings)
 
-	for i := 0; i <= 6; i++ {
+	for i := 0; i < 6; i++ {
 		if header_level_count[i] != 0 {
-			fmt.Printf("Header %d occurs %d times.\n", i, header_level_count[i])
+			fmt.Printf("Header %d occurs %d times.\n", (i + 1), header_level_count[i])
 		}
 	}
 }

tests/weird_headers.md

@@ -0,0 +1,33 @@
+some text.
+
+#### test markdown doc
+
+## header2
+
+#### header4
+
+some text.
+
+```bash
+echo 'hi'
+```
+
+#### another header4
+
+more text.
+
+####third header4
+
+####fourth #header4
+
+ ## this is not a header anymore
+
+##### header5
+
+## a second header2
+
+#### testing
+
+```
+cool code
+```