From 8f94a429314435cd96b90ac1d1a96a3b6196908d Mon Sep 17 00:00:00 2001
From: Alexander Schmidt <alex@treefish.org>
Date: Wed, 8 Nov 2017 00:24:53 +0100
Subject: [PATCH] Added help

---
 bitvalue | 34 ++++++++++++++++++++++++++++------
 1 file changed, 28 insertions(+), 6 deletions(-)

diff --git a/bitvalue b/bitvalue
index 617305e..831145d 100755
--- a/bitvalue
+++ b/bitvalue
@@ -2,6 +2,34 @@
 
 CONFIG=~/.bitvaluerc
 
+USAGE="Usage: $(basename "$0") [-h] [-t val]
+Simple bash script to visualize the value of your bitcoin investment.
+
+Arguments:
+  -h  show this help text
+  -t  set the timespan (default: 30d)"
+
+TIMESPAN="30d"
+
+while getopts ':ht:' option; do
+    case "$option" in
+	h) echo "$USAGE"
+	   exit
+	   ;;
+	t) TIMESPAN=$OPTARG
+	   ;;
+	:) printf "missing argument for -%s\n" "$OPTARG" >&2
+	   echo "$usage" >&2
+	   exit 1
+	   ;;
+	\?) printf "illegal option: -%s\n" "$OPTARG" >&2
+	    echo "$usage" >&2
+	    exit 1
+	    ;;
+    esac
+done
+shift $((OPTIND - 1))
+
 if [ ! -f $CONFIG ]; then
     cat << EOF > $CONFIG
 EXCHANGE="bitstamp"
@@ -14,12 +42,6 @@ fi
 
 source $CONFIG
 
-if [ ! -z "$1" ]; then
-    TIMESPAN="$1"
-else
-    TIMESPAN="30d"
-fi
-
 cat << EOF | gnuplot
 set terminal dumb
 set datafile separator ","
-- 
2.39.5