From 06da4ca080b95ebc6450404d9682eb7680dca5e1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Diego=20Fernando=20Carri=C3=B3n?= <diego@crthaze.com>
Date: Fri, 13 Oct 2023 15:51:56 +0200
Subject: [PATCH] better help

---
 README.md | 10 ++++++++--
 main.go   | 30 +++++++++++++++++++++++++++++-
 2 files changed, 37 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index f24ac32..6dbcd81 100644
--- a/README.md
+++ b/README.md
@@ -9,13 +9,19 @@ like `lookup`.
 
 ```bash
 $ ./spry
-Usage of ./spry:
+Usage of ./spry [Options] [Template Files]:
   -d string
         Output delimiter between template files rendered (default "---")
   -f value
         Specify a values file (JSON or YAML)
   -helm
-        Whether to nest provided values under .Values
+        Helm compatibility: provided values will be nested under .Values
   -set value
         Set a specific value (foo.bar=spam)
+
+Template Files can also be directories to recurse for templates.
+
+If no template files are provided it will attempt read from STDIN.
+If no input is available from STDIN it will print this usage message instead.
+Pass only '-' to Template Files to force waiting for input.
 ```
diff --git a/main.go b/main.go
index aa861af..a8127f6 100644
--- a/main.go
+++ b/main.go
@@ -88,8 +88,36 @@ func init() {
 		"d", "---",
 		"Output delimiter between template files rendered",
 	)
-	flag.BoolVar(&flags.helmCompat, "helm", false, "Whether to nest provided values under .Values")
+	flag.BoolVar(
+		&flags.helmCompat,
+		"helm", false,
+		"Helm compatibility: provided values will be nested under .Values",
+	)
 	flag.Parse()
+
+	flag.Usage = func() {
+		fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s [Options] [Template Files]:\n", os.Args[0])
+		flag.PrintDefaults()
+		fmt.Fprintf(flag.CommandLine.Output(), "\n")
+		fmt.Fprintf(
+			flag.CommandLine.Output(),
+			"Template Files can also be directories to recurse for templates.\n",
+		)
+		fmt.Fprintf(flag.CommandLine.Output(), "\n")
+		fmt.Fprintf(
+			flag.CommandLine.Output(),
+			"If no template files are provided it will attempt read from STDIN.\n",
+		)
+		fmt.Fprintf(
+			flag.CommandLine.Output(),
+			"If no input is available from STDIN it will print this usage message instead.\n",
+		)
+		fmt.Fprintf(
+			flag.CommandLine.Output(),
+			"Pass only '-' to Template Files to force waiting for input.\n",
+		)
+		fmt.Fprintf(flag.CommandLine.Output(), "\n")
+	}
 }
 
 func checkErr(err error) {