improve README and help

README.md

@@ -1,6 +1,20 @@
 # spry
 
-Basic [Sprig](https://masterminds.github.io/sprig/) Template Rendering.
+Basic [Sprig](https://masterminds.github.io/sprig/) &
+[Helm Templating Language (HTL)](https://helm.sh/docs/howto/charts_tips_and_tricks/#know-your-template-functions)
+Template Rendering Tool.
+
+It's design emulates how the `helm template` command runs, for rendering simple
+Go Templates, Sprig extended Go Templates, or Helm Templating Language (HTL)
+Templates, outside of a Helm Chart.
+
+It takes provided templates and renders them using provided values.
+
+### _ Files
+
+Like with `helm template` template files whose names begins with `_` will not
+produce output, but are used to provide common code used in other template
+files.
 
 ## Usage Examples
 
@@ -18,17 +32,20 @@ Usage of ./spry [Options] [Template Files]:
   -fp string
         Prefix for the filename in the output. (default "# ")
   -helm
-        Use Helm templating language (superset of Sprig).
+        Use the Helm Templating Language (HTL) (a superset of Sprig).
   -helmDNS
-        When using Helm Tpl Lang, support DNS resolution. (default true)
-  -helmLint
-        When using Helm Tpl Lang, enable the Linting Mode.
+        When using HTL, support DNS resolution. (default true)
+  -helmLin
+        When using HTL, enable the Linting Mode.
   -helmNestValues
-        When using Helm Tpl Lang, Nest provided values under '.Values' (default true)
+        When using HTL, Nest provided values under '.Values' (default true)
   -helmStrict
-        When using Helm Tpl Lang, use strict rendering.
+        When using HTL, use strict rendering.
   -set value
         Set a specific value (foo.bar=spam)
+  -v    Print the version and exit.
+  -version
+        Print the version and exit.
 
 Template Files can also be directories to recurse for templates.
 

main.go

@@ -82,27 +82,27 @@ func init() {
 	flag.BoolVar(
 		&flags.helm,
 		"helm", false,
-		"Use Helm templating language (superset of Sprig).",
+		"Use the Helm Templating Language (HTL) (a superset of Sprig).",
 	)
 	flag.BoolVar(
 		&flags.helmStrict,
 		"helmStrict", false,
-		"When using Helm Tpl Lang, use strict rendering.",
+		"When using HTL, use strict rendering.",
 	)
 	flag.BoolVar(
 		&flags.helmDNSFunc,
 		"helmDNS", true,
-		"When using Helm Tpl Lang, support DNS resolution.",
+		"When using HTL, support DNS resolution.",
 	)
 	flag.BoolVar(
 		&flags.helmLint,
 		"helmLint", false,
-		"When using Helm Tpl Lang, enable the Linting Mode.",
+		"When using HTL, enable the Linting Mode.",
 	)
 	flag.BoolVar(
 		&flags.helmNestValues,
 		"helmNestValues", true,
-		"When using Helm Tpl Lang, Nest provided values under '.Values'",
+		"When using HTL, Nest provided values under '.Values'",
 	)
 	flag.StringVar(
 		&flags.outputFilenamePrefix,