introduce inline templates (#198)

README.md

@@ -111,6 +111,34 @@ for example:
        Ticket: ${0} -->
 ```
 
+Macros can also use inline templates.
+Inline templates are templates where the template content
+is described in the `<yaml-data>`.
+The `Template` value starts with a `#`, followed by the key
+used in the `<yaml-data>`.
+The key's value must be a string which defines the template's content.
+
+```markdown
+  <!-- Macro: <tblbox\s+(.*?)\s*>
+       Template: #inline
+       title: ${1}
+       inline: |
+           <table>
+           <thead><tr><th>{{ .title }}</th></tr></thead>
+           <tbody><tr><td>
+        -->
+  <!-- Macro: </tblbox>
+       Template: #also_inline
+       also_inline: |
+           </td></tr></tbody></table>
+        -->
+  <tblbox with a title>
+  and some
+  content
+  </tblbox>
+```
+
+
 ### Code Blocks
 
 If you have long code blocks, you can make them collapsible with the [Code Block Macro]:

pkg/mark/macro/macro.go

@@ -134,13 +134,36 @@ func ExtractMacros(
 				macro Macro
 			)
 
-			macro.Template, err = includes.LoadTemplate(base, template, templates)
-			if err != nil {
-				err = karma.Format(err, "unable to load template")
+			if strings.HasPrefix(template, "#") {
+				cfg := map[string]interface{}{}
 
-				return nil
+				err = yaml.Unmarshal([]byte(config), &cfg)
+				if err != nil {
+					err = karma.Format(
+						err,
+						"unable to unmarshal macros config template",
+					)
+					return nil
+				}
+				body, _ := cfg[template[1:]].(string)
+				macro.Template, err = templates.New(template).Parse(body)
+				if err != nil {
+					err = karma.Format(
+						err,
+						"unable to parse template",
+					)
+					return nil
+				}
+			} else {
+				macro.Template, err = includes.LoadTemplate(base, template, templates)
+				if err != nil {
+					err = karma.Format(err, "unable to load template")
+
+					return nil
+				}
 			}
 
+
 			facts := karma.
 				Describe("template", template).
 				Describe("expr", expr)