Improve stripMarkdown formatting

At some point this will need to be done in another thread.

lib/folder_views/note_tile.dart

@@ -1,5 +1,8 @@
+import 'dart:convert';
+
 import 'package:flutter/material.dart';
 import 'package:gitjournal/core/note.dart';
+import 'package:gitjournal/utils/markdown.dart';
 
 typedef void NoteSelectedFunction(Note note);
 
@@ -11,11 +14,18 @@ class NoteTile extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
-    var body = note.body.trimRight();
+    var buffer = StringBuffer();
+    var i = 0;
+    for (var line in LineSplitter.split(note.body)) {
+      line = replaceMarkdownChars(line);
+      buffer.writeln(line);
 
-    body = body.replaceAll('[ ]', '☐');
-    body = body.replaceAll('[x]', '☑');
-    body = body.replaceAll('[X]', '☑');
+      i += 1;
+      if (i == 12) {
+        break;
+      }
+    }
+    var body = buffer.toString();
 
     var theme = Theme.of(context);
     var textTheme = theme.textTheme;

lib/utils/markdown.dart

@@ -18,9 +18,7 @@ String stripMarkdownFormatting(String markdown) {
     if (line.isEmpty) {
       continue;
     }
-    line = line.replaceFirst('[ ]', '☐');
-    line = line.replaceFirst('[x]', '☑');
-    line = line.replaceFirst('[X]', '☑');
+    line = replaceMarkdownChars(line);
 
     output.write(line.trim());
     output.write(' ');
@@ -28,3 +26,31 @@ String stripMarkdownFormatting(String markdown) {
 
   return output.toString();
 }
+
+String replaceMarkdownChars(String line) {
+  line = line.replaceFirst('[ ]', '☐');
+  line = line.replaceFirst('[x]', '☑');
+  line = line.replaceFirst('[X]', '☑');
+
+  line = replaceListChar(line, '*');
+  line = replaceListChar(line, '-');
+  line = replaceListChar(line, '+');
+
+  return line;
+}
+
+String replaceListChar(String line, String char) {
+  const String bullet = '•';
+
+  var starPos = line.indexOf(char);
+  if (starPos == 0) {
+    line = line.replaceFirst(char, bullet);
+  } else if (starPos != -1) {
+    var beforeStar = line.substring(0, starPos);
+    if (beforeStar.trim().isEmpty) {
+      line = line.replaceFirst(char, bullet, starPos);
+    }
+  }
+
+  return line;
+}

test/strip_markdown_formatting_test.dart

@@ -27,7 +27,7 @@ look like:
       """;
 
       expect(stripMarkdownFormatting(input),
-          'Itemized lists look like: * this one * that one ');
+          'Itemized lists look like: • this one • that one ');
     });
 
     test('Checklist', () {
@@ -41,5 +41,17 @@ look like:
       expect(stripMarkdownFormatting(input),
           'Itemized lists ☐ this one ☑ that one ☑ last ');
     });
+
+    test('List', () {
+      var input = """Itemized lists
+
+* this one
+  * that one
+* four
+""";
+
+      expect(stripMarkdownFormatting(input),
+          'Itemized lists • this one • that one • four ');
+    });
   });
 }