factor out usage

1 files changed, 5 insertions, 1 deletions

diff --git a/anondcim b/anondcim
index 7a05970..1936da7 100755
--- a/anondcim
+++ b/anondcim
@@ -12,13 +12,17 @@ err() {
     echo "$*" >&2
 }
 
+die_usage() {
+    die "Usage: $0 [-p image_prefix] [-s destination_size (absolute or percentage)] [-d destination_directory] imagefile(s)"
+}
+
 rand() {
     # random number between 0 and $1 - 1
     # read from urandom, sh interpretes numbers with leading 0 wrong, so prepend $1 which doesn't change the result
     echo $(( $1$(tr -dc "0-9" < /dev/urandom | head -c $((${#1} + 1))) % $1 ))
 }
 
-[ $# -gt 0 ] || die "Usage: $0 [-p image_prefix] [-s destination_size (absolute or percentage)] [-d destination_directory] imagefile(s)"
+[ $# -gt 0 ] || die_usage
 
 which convert 2>/dev/null || die "ImageMagick (convert, identify) is not installed"
 which jhead 2>/dev/null || which exiftool 2>/dev/null || die "jhead or exiftool has to be installed"