Expandable commit bodies (#2980)

* Initial working state of expandable commit bodies

* Fix all commits having showing button for multiline commits

* Refactor checking multiline messages method

* Force newlines with <br> in commit body

* Show multiple lines in the list view of repositories

* Fixed proper newlines and minor refactor

Use <pre> instead of <p>, this is so we can use \n instead of having to manually place <br> into the HTML. Makes it easier to display commit bodies.

* Fix commit list messages jumping around

* Fix indentation in view_list.tmpl

* Use vertical-align: baseline instead of top

* Refactor commit button toggle function

* Remove RenderCommitBodyLink function

* Add comments

* Add newline at the end of _repository.less

* Fix long commit bodies not properly wrapping inside <pre>

* Don't split on double newlines

* Show the commit body in commit view

* Update stylesheets

* Add/fix comments and run make fmt

* Fix spaces not being tabs

1 files changed, 27 insertions, 2 deletions

diff --git a/modules/templates/helper.go b/modules/templates/helper.go
index 2b9e593360..42e465aeaa 100644
--- a/modules/templates/helper.go
+++ b/modules/templates/helper.go
@@ -110,8 +110,10 @@ func NewFuncMap() []template.FuncMap {
 		"EscapePound": func(str string) string {
 			return strings.NewReplacer("%", "%25", "#", "%23", " ", "%20", "?", "%3F").Replace(str)
 		},
-		"RenderCommitMessage":     RenderCommitMessage,
-		"RenderCommitMessageLink": RenderCommitMessageLink,
+		"RenderCommitMessage":      RenderCommitMessage,
+		"RenderCommitMessageLink":  RenderCommitMessageLink,
+		"RenderCommitBody":         RenderCommitBody,
+		"IsMultilineCommitMessage": IsMultilineCommitMessage,
 		"ThemeColorMetaTag": func() string {
 			return setting.UI.ThemeColorMetaTag
 		},
@@ -280,6 +282,29 @@ func renderCommitMessage(msg string, opts markup.RenderIssueIndexPatternOptions)
 	return template.HTML(msgLines[0])
 }
 
+// RenderCommitBody extracts the body of a commit message without its title.
+func RenderCommitBody(msg, urlPrefix string, metas map[string]string) template.HTML {
+	return renderCommitBody(msg, markup.RenderIssueIndexPatternOptions{
+		URLPrefix: urlPrefix,
+		Metas:     metas,
+	})
+}
+
+func renderCommitBody(msg string, opts markup.RenderIssueIndexPatternOptions) template.HTML {
+	cleanMsg := template.HTMLEscapeString(msg)
+	fullMessage := string(markup.RenderIssueIndexPattern([]byte(cleanMsg), opts))
+	body := strings.Split(strings.TrimSpace(fullMessage), "\n")
+	if len(body) == 0 {
+		return template.HTML("")
+	}
+	return template.HTML(strings.Join(body[1:], "\n"))
+}
+
+// IsMultilineCommitMessage checks to see if a commit message contains multiple lines.
+func IsMultilineCommitMessage(msg string) bool {
+	return strings.Count(strings.TrimSpace(msg), "\n") > 1
+}
+
 // Actioner describes an action
 type Actioner interface {
 	GetOpType() models.ActionType