From 5bb9d6d3dfba750b7e0cbcfe26733b17e8685219 Mon Sep 17 00:00:00 2001
From: ziembla <woj@ziembla.com>
Date: Sun, 10 Dec 2017 18:38:25 +0100
Subject: [PATCH] help message for nbdiff_checkpoint

---
 docker/bin/nbdiff_checkpoint | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/docker/bin/nbdiff_checkpoint b/docker/bin/nbdiff_checkpoint
index ffbb21c..2969e1b 100755
--- a/docker/bin/nbdiff_checkpoint
+++ b/docker/bin/nbdiff_checkpoint
@@ -1,9 +1,16 @@
 #!/bin/bash
+if [ "$#" -ne 1 ]; then
+    echo "usage: nbdiff_checkpoint NOTEBOOK.ipynb"
+    echo
+    echo "Show differences between given jupyter notebook and its checkpointed version (in .ipynb_checkpoints subdirectory)"
+    exit
+fi
+
 DIRNAME=$(dirname "$1")
 BASENAME=$(basename "$1" .ipynb)
 
 WORKING_COPY=$DIRNAME/$BASENAME.ipynb
 CHECKPOINT_COPY=$DIRNAME/.ipynb_checkpoints/$BASENAME-checkpoint.ipynb
 
-echo "How change $CHECKPOINT_COPY into $WORKING_COPY"
+echo "----- Analysing how to change $CHECKPOINT_COPY into $WORKING_COPY -----"
 nbdiff "$CHECKPOINT_COPY" "$WORKING_COPY" --ignore-details