From 4c631bba292ea177e80a652c685a8b47a79b30b2 Mon Sep 17 00:00:00 2001
From: Wesley Kerfoot <wjak56@gmail.com>
Date: Sat, 21 Dec 2019 17:23:35 -0500
Subject: [PATCH] write proper help message

---
 src/twit2blog.nim         |  7 ++++---
 src/twit2blogpkg/help.nim | 18 ++++++++++++++++++
 2 files changed, 22 insertions(+), 3 deletions(-)
 create mode 100644 src/twit2blogpkg/help.nim

diff --git a/src/twit2blog.nim b/src/twit2blog.nim
index 14a0461..9881274 100644
--- a/src/twit2blog.nim
+++ b/src/twit2blog.nim
@@ -1,4 +1,4 @@
-import twit2blogpkg/twitter
+import twit2blogpkg/twitter, twit2blogpkg/help
 import os, system, parseopt, strutils, tables
 
 when isMainModule:
@@ -12,6 +12,8 @@ when isMainModule:
     case args.kind
       of cmdEnd: break
       of cmdShortOption, cmdLongOption:
+        if (args.key == "help") or (args.key == "h"):
+          writeHelp()
         if args.val == "":
           continue
         else:
@@ -27,7 +29,6 @@ when isMainModule:
     twitterParams["thread"] = twitterParams["t"]
 
   if not (twitterParams.hasKey("user") and twitterParams.hasKey("thread")):
-    stderr.writeLine("Invalid Arguments. Must provide both --user and --thread (or -u and -t). E.g. -u:foo -t:123")
-    quit(1)
+    writeHelp()
 
   echo twitterParams["thread"].renderThread(twitterParams["user"])
diff --git a/src/twit2blogpkg/help.nim b/src/twit2blogpkg/help.nim
new file mode 100644
index 0000000..3457d1d
--- /dev/null
+++ b/src/twit2blogpkg/help.nim
@@ -0,0 +1,18 @@
+import system
+
+const
+  help = """
+Usage: twit2blog [opts]
+
+Options:
+  -u, --user   The screen name of the twitter user. E.g. If your twitter is https://twitter.com/foobar, then `foobar`.
+  -t, --thread The ID of the last tweet in your thread. E.g. 12345.
+
+For more information read the Github readme:
+  https://github.com/weskerfoot/Twit2Blog#readme
+"""
+
+proc writeHelp*(quit=true) =
+  echo(help)
+  if quit:
+    quit(1)