create: Use archetype template as-is as a Go template

This commit removes the fragile front matter decoding, and takes the provided archetype file as-is and processes it as a template.

This also means that we no longer will attempt to fill in default values for `title` and `date`.

The upside is that it is now easy to create these values in a dynamic way:

```toml
+++
title = {{ .BaseFileName | title }}
date = {{ .Date }}
draft = true
+++
```

You can currently use all of Hugo's template funcs, but the data context is currently very shallow:

* `.Type` gives the archetype kind provided
* `.Name` gives the target file name without extension.
* `.Path` gives the target file name
* `.Date` gives the current time as RFC3339 formatted string

The above  will probably be extended in #1629.

Fixes #452
Updates #1629

1 files changed, 7 insertions, 5 deletions

diff --git a/create/content_test.go b/create/content_test.go
index 8eaaf7bf5..aa7ed3fcf 100644
--- a/create/content_test.go
+++ b/create/content_test.go
@@ -45,9 +45,9 @@ func TestNewContent(t *testing.T) {
 	}{
 		{"post", "post/sample-1.md", []string{`title = "Post Arch title"`, `test = "test1"`, "date = \"2015-01-12T19:20:04-07:00\""}},
 		{"emptydate", "post/sample-ed.md", []string{`title = "Empty Date Arch title"`, `test = "test1"`}},
-		{"stump", "stump/sample-2.md", []string{`title = "sample 2"`}},     // no archetype file
-		{"", "sample-3.md", []string{`title = "sample 3"`}},                // no archetype
-		{"product", "product/sample-4.md", []string{`title = "sample 4"`}}, // empty archetype front matter
+		{"stump", "stump/sample-2.md", []string{`title = "Sample 2"`}},     // no archetype file
+		{"", "sample-3.md", []string{`title = "Sample 3"`}},                // no archetype
+		{"product", "product/sample-4.md", []string{`title = "SAMPLE-4"`}}, // empty archetype front matter
 	}
 
 	for _, c := range cases {
@@ -108,8 +108,10 @@ func initFs(fs *hugofs.Fs) error {
 			content: "+++\ndate = \"2015-01-12T19:20:04-07:00\"\ntitle = \"Post Arch title\"\ntest = \"test1\"\n+++\n",
 		},
 		{
-			path:    filepath.Join("archetypes", "product.md"),
-			content: "+++\n+++\n",
+			path: filepath.Join("archetypes", "product.md"),
+			content: `+++
+title = "{{ .BaseFileName  | upper }}"
++++`,
 		},
 		{
 			path:    filepath.Join("archetypes", "emptydate.md"),