Added top level .Hugo variable with version, commit and generator information + docs

Added Version, CommitHash and BuildDate to hugolib/hugo.go and used it in build
Removed commitHash and buildDate from commands/version.go and used hugolib vars
Removed getDateFormat function from commands/version.go

Conflicts:
	README.md
	docs/content/templates/variables.md

3 files changed, 31 insertions, 0 deletions

diff --git a/hugolib/hugo.go b/hugolib/hugo.go
new file mode 100644
index 000000000..67c048dfa
--- /dev/null
+++ b/hugolib/hugo.go
@@ -0,0 +1,25 @@
+package hugolib
+
+const Version = "0.13-DEV"
+
+var (
+	CommitHash string
+	BuildDate  string
+)
+
+// Hugo contains all the information about the current Hugo environment
+type HugoInfo struct {
+	Version    string
+	Generator  string
+	CommitHash string
+	BuildDate  string
+}
+
+func NewHugoInfo() HugoInfo {
+	return HugoInfo{
+		Version:    Version,
+		CommitHash: CommitHash,
+		BuildDate:  BuildDate,
+		Generator:  `<meta name="generator" content="Hugo ` + Version + `" />`,
+	}
+}
diff --git a/hugolib/node.go b/hugolib/node.go
index d502de389..f6d583a65 100644
--- a/hugolib/node.go
+++ b/hugolib/node.go
@@ -29,6 +29,7 @@ type Node struct {
 	Params      map[string]interface{}
 	Date        time.Time
 	Sitemap     Sitemap
+	Hugo        *HugoInfo
 	UrlPath
 }
 
diff --git a/hugolib/site.go b/hugolib/site.go
index b4af9e76c..058ccd663 100644
--- a/hugolib/site.go
+++ b/hugolib/site.go
@@ -67,6 +67,7 @@ type Site struct {
 	Taxonomies  TaxonomyList
 	Source      source.Input
 	Sections    Taxonomy
+	Hugo        HugoInfo
 	Info        SiteInfo
 	Shortcodes  map[string]ShortcodeFunc
 	Menus       Menus
@@ -96,6 +97,7 @@ type SiteInfo struct {
 	Files           []*source.File
 	Recent          *Pages // legacy, should be identical to Pages
 	Menus           *Menus
+	Hugo            *HugoInfo
 	Title           string
 	Author          map[string]interface{}
 	LanguageCode    string
@@ -339,6 +341,7 @@ func (s *Site) initialize() (err error) {
 
 	s.Menus = Menus{}
 
+	s.Hugo = NewHugoInfo()
 	s.initializeSiteInfo()
 
 	s.Shortcodes = make(map[string]ShortcodeFunc)
@@ -366,6 +369,7 @@ func (s *Site) initializeSiteInfo() {
 		Menus:           &s.Menus,
 		Params:          params,
 		Permalinks:      permalinks,
+		Hugo:            &s.Hugo,
 	}
 }
 
@@ -1190,6 +1194,7 @@ func (s *Site) NewNode() *Node {
 	return &Node{
 		Data: make(map[string]interface{}),
 		Site: &s.Info,
+		Hugo: &s.Hugo,
 	}
 }