From 7acbcf9ddd5058fa131d5d0eeee4ce346988ad80 Mon Sep 17 00:00:00 2001
From: Sergio Benitez <sbenitez@mit.edu>
Date: Fri, 18 Sep 2015 18:57:06 -0700
Subject: [PATCH] Commit messages now rendered with line breaks and prefix
 spacing.

---
 modules/base/template.go | 35 ++++++++++++++++++++++++++++++++++-
 templates/repo/diff.tmpl |  2 +-
 2 files changed, 35 insertions(+), 2 deletions(-)

diff --git a/modules/base/template.go b/modules/base/template.go
index 2571e7d2..f5f567ad 100644
--- a/modules/base/template.go
+++ b/modules/base/template.go
@@ -96,9 +96,42 @@ func ToUtf8(content string) string {
 	return res
 }
 
+// Replaces all prefixes 'old' in 's' with 'new'.
+func ReplaceLeft(s, old, new string) string {
+	old_len, new_len, i, n := len(old), len(new), 0, 0
+	for ; i < len(s) && strings.HasPrefix(s[i:], old); n += 1 {
+		i += old_len
+	}
+
+	// simple optimization
+	if n == 0 {
+		return s
+	}
+
+	// allocating space for the new string
+	newLen := n*new_len + len(s[i:])
+	replacement := make([]byte, newLen, newLen)
+
+	j := 0
+	for ; j < n*new_len; j += new_len {
+		copy(replacement[j:j+new_len], new)
+	}
+
+	copy(replacement[j:], s[i:])
+	return string(replacement)
+}
+
 // RenderCommitMessage renders commit message with XSS-safe and special links.
 func RenderCommitMessage(msg, urlPrefix string) template.HTML {
-	return template.HTML(string(RenderIssueIndexPattern([]byte(template.HTMLEscapeString(msg)), urlPrefix)))
+	cleanMsg := template.HTMLEscapeString(msg)
+	fullMessage := string(RenderIssueIndexPattern([]byte(cleanMsg), urlPrefix))
+	msgLines := strings.Split(strings.TrimSpace(fullMessage), "\n")
+	for i := range msgLines {
+		msgLines[i] = ReplaceLeft(msgLines[i], " ", "&nbsp;")
+	}
+
+	fullMessage = strings.Join(msgLines, "<br>")
+	return template.HTML(fullMessage)
 }
 
 var TemplateFuncs template.FuncMap = map[string]interface{}{
diff --git a/templates/repo/diff.tmpl b/templates/repo/diff.tmpl
index a280c81e..2e9bdd03 100644
--- a/templates/repo/diff.tmpl
+++ b/templates/repo/diff.tmpl
@@ -6,12 +6,12 @@
     {{template "repo/commits_table" .}}
     {{else}}
     <h4 class="ui top attached info header">
-      {{RenderCommitMessage .Commit.Message $.RepoLink}}
       <div class="ui right">
         <a class="ui blue tiny button" href="{{EscapePound .SourcePath}}">
           {{.i18n.Tr "repo.diff.browse_source"}}
         </a>
       </div>
+      {{RenderCommitMessage .Commit.Message $.RepoLink}}
     </h4>
     <div class="ui attached info segment">
       {{if .Author}}