all: go embed the README and use it on the CLI for help command

3 files changed, 67 insertions, 102 deletions

diff --git a/README b/README
index ad20e53..a26722f 100644
--- a/README
+++ b/README
@@ -1,54 +1,63 @@
 = Jarink
 
-Jarink is a program to help web administrator to maintains their website.
+Jarink is a program to help web administrator and developers to inspect
+and maintains their website.
 
 == Synopsis
 
-	jarink [OPTIONS] <COMMAND> <args...>
+        jarink [OPTIONS] <COMMAND> <args...>
 
 Available commands,
 
-	brokenlinks - scan the website for broken links (page and images).
+        brokenlinks - scan the website for broken links (page and images).
+        help - print the usage of the command.
 
 == Usage
 
 [OPTIONS] brokenlinks URL
 
-	Start scanning for broken links on the web server pointed by URL.
-	Invalid links will be scanned on anchor href attribute
-	("<a href=...>") or on the image src attribute ("<img src=...").
+        Start scanning for broken links on the web server pointed by URL.
+        Links will be scanned on anchor href attribute ("<a href=...>") or
+        on the image src attribute ("<img src=...").
 
-	Once finished it will print the page and list of broken links inside
-	that page in JSON format.
+        Once finished it will print the page and list of broken links in
+        JSON format to standard output.
 
-	This command accept the following options,
+        This command accept the following options,
 
-		-verbose : print the page that being scanned.
+                -verbose : print the page that being scanned to standard
+                           error.
 
-	Example,
+        Example,
 
-	$ jarink scan https://kilabit.info
-	{
-	  "https://kilabit.info/some/page": [
-	    {
-	      "Link": "https://kilabit.info/some/page/image.png",
-	      "Code": 404
-	    },
-	    {
-	      "Link": "https://external.com/link",
-	      "Error": "Internal server error",
-	      "Code": 500
-	    }
-	  ],
-	  "https://kilabit.info/another/page": [
-	    {
-	      "Link": "https://kilabit.info/another/page/image.png",
-	      "Code": 404
-	    },
-	    {
-	      "Link": "https://external.org/link",
-	      "Error": "Internal server error",
-	      "Code": 500
-	    }
-	  ]
-	}
+        $ jarink brokenlinks https://kilabit.info
+        {
+          "https://kilabit.info/some/page": [
+            {
+              "Link": "https://kilabit.info/some/page/image.png",
+              "Code": 404
+            },
+            {
+              "Link": "https://external.com/link",
+              "Error": "Internal server error",
+              "Code": 500
+            }
+          ],
+          "https://kilabit.info/another/page": [
+            {
+              "Link": "https://kilabit.info/another/page/image.png",
+              "Code": 404
+            },
+            {
+              "Link": "https://external.org/link",
+              "Error": "Internal server error",
+              "Code": 500
+            }
+          ]
+        }
+
+== Notes
+
+jarink version 0.1.0.
+
+Source code - https://git.sr.ht/~shulhan/jarink
diff --git a/cmd/jarink/main.go b/cmd/jarink/main.go
index d73cd1a..4f4d206 100644
--- a/cmd/jarink/main.go
+++ b/cmd/jarink/main.go
@@ -25,17 +25,15 @@ func main() {
 	flag.Parse()
 
 	var cmd = flag.Arg(0)
-	if cmd == "" {
-		goto invalid_command
-	}
-
 	cmd = strings.ToLower(cmd)
-	if cmd == "brokenlinks" {
+	switch cmd {
+	case `brokenlinks`:
 		var brokenlinksOpts = jarink.BrokenlinksOptions{
 			Url:       flag.Arg(1),
 			IsVerbose: optVerbose,
 		}
 		if brokenlinksOpts.Url == "" {
+			log.Printf(`Missing argument URL to be scanned.`)
 			goto invalid_command
 		}
 
@@ -53,69 +51,16 @@ func main() {
 		}
 		fmt.Printf("%s\n", resultJson)
 		return
-	}
-
-invalid_command:
-	usage()
-	os.Exit(1)
-}
-
-func usage() {
-	log.Println(`= Jarink
-
-Jarink is a program to help web administrator to maintains their website.
-
-== Synopsis
-
-	jarink [OPTIONS] <COMMAND> <args...>
 
-Available commands,
-
-	brokenlinks - scan the website for broken links (page and images).
-
-== Usage
-
-[OPTIONS] brokenlinks URL
-
-	Start scanning for broken links on the web server pointed by URL.
-	Invalid links will be scanned on anchor href attribute
-	("<a href=...>") or on the image src attribute ("<img src=...").
-
-	Once finished it will print the page and list of broken links inside
-	that page in JSON format.
-
-	This command accept the following options,
-
-		-verbose : print the page that being scanned.
-
-	Example,
+	case `help`:
+		log.Println(jarink.GoEmbedReadme)
+		return
 
-	$ jarink scan https://kilabit.info
-	{
-	  "https://kilabit.info/some/page": [
-	    {
-	      "Link": "https://kilabit.info/some/page/image.png",
-	      "Code": 404
-	    },
-	    {
-	      "Link": "https://external.com/link",
-	      "Error": "Internal server error",
-	      "Code": 500
-	    }
-	  ],
-	  "https://kilabit.info/another/page": [
-	    {
-	      "Link": "https://kilabit.info/another/page/image.png",
-	      "Code": 404
-	    },
-	    {
-	      "Link": "https://external.org/link",
-	      "Error": "Internal server error",
-	      "Code": 500
-	    }
-	  ]
+	default:
+		log.Printf(`Missing or invalid command %q`, cmd)
 	}
 
---
-jarink v` + jarink.Version)
+invalid_command:
+	log.Printf(`Run "jarink help" for usage.`)
+	os.Exit(1)
 }
diff --git a/jarink.go b/jarink.go
new file mode 100644
index 0000000..141becb
--- /dev/null
+++ b/jarink.go
@@ -0,0 +1,11 @@
+// SPDX-FileCopyrightText: 2025 M. Shulhan <ms@kilabit.info>
+// SPDX-License-Identifier: GPL-3.0-only
+
+package jarink
+
+import (
+	_ "embed"
+)
+
+//go:embed README
+var GoEmbedReadme string