Create script to automatically update all article 'Update dates' (RoboticsKnowledgebase#80)

Author: RaAndOn

date.bash

@@ -0,0 +1,18 @@
+#!/bin/bash
+
+# On this date all posts were updated with the date field
+# We want to ignore this date
+all_change_date=2020-05-12
+
+# Go through all files in the wiki folder
+for file in `find wiki/ -name '*.md'`; do
+	# Get last date on which file was updated 
+	last_change=$(git log -1 --format="%ad" --date=short $file)
+	if [ "$last_change" = "$all_change_date" ]; then
+		# If the last change was on the all_change_date
+		# set last_change to last change before all_change_date
+		last_change=$(git log -1 --format="%ad" --before=$all_change_date --date=short $file)
+	fi
+	# Replace date filed with last_change
+	sed -i "s/date:.*/date: $last_change/" $file;
+done