Fix newline prefixes for 'pre' blocks

md2htmlV2.go

@@ -163,11 +163,11 @@ func (cv ConverterV2) md2html(in []rune, enableButtons bool) (string, []ButtonV2
 					// TODO: How do we decide the language; first word? first line?
 					firstLine := strings.TrimSpace(splitLines[0])
 					if len(firstLine) > 0 && strings.HasPrefix(nestedT, firstLine) {
-						content := strings.TrimPrefix(nestedT, firstLine)
+						content := strings.TrimPrefix(nestedT, firstLine+"\n")
 						return out.String() + "<pre><code class=\"language-" + firstLine + "\">" + content + "</code></pre>" + followT, followB
 					}
 				}
-				return out.String() + "<pre>" + nestedT + "</pre>" + followT, followB
+				return out.String() + "<pre>" + strings.TrimPrefix(nestedT, "\n") + "</pre>" + followT, followB
 			}
 
 			// internal won't have any interesting item closings

md2htmlV2_test.go

@@ -26,13 +26,13 @@ var basicMDv2 = []struct {
 		out: "<pre>content</pre>",
 	}, {
 		in:  "```code\ncontent```",
-		out: "<pre><code class=\"language-code\">\ncontent</code></pre>",
+		out: "<pre><code class=\"language-code\">content</code></pre>",
 	}, {
 		in:  "```spaced words\ncontent```",
-		out: "<pre><code class=\"language-spaced words\">\ncontent</code></pre>",
+		out: "<pre><code class=\"language-spaced words\">content</code></pre>",
 	}, {
 		in:  "```quoted\"words\ncontent```",
-		out: "<pre><code class=\"language-quoted&#34;words\">\ncontent</code></pre>",
+		out: "<pre><code class=\"language-quoted&#34;words\">content</code></pre>",
 	}, {
 		// NOTE: Decide on whether this is just a sad casualty of markdown parsing, or if:
 		//  The closing tag should be the last viable part, if in a sequence. (eg 3x'_', last two are underline closes)

reverseV2.go

@@ -72,7 +72,7 @@ func (cv ConverterV2) reverse(in []rune, buttons []ButtonV2) (string, error) {
 				if len(m) > 0 {
 					// This <pre> block contains a <code class...> block; handle the language.
 					lang, code := m[1], m[2]
-					out.WriteString("```" + lang + code + "```")
+					out.WriteString("```" + lang + "\n" + code + "```")
 				} else {
 					// This is a regular boring pre block
 					out.WriteString("```" + content + "```")