matlabRel

#!/bin/bash
# bash script providing qutebrowser with a MATLAB documentation URL modified so
# as to access a specific version, which is given as the first argument in the
# form of a string such as R2017b, R2015a, ... (futher arguments are ignored)

# ignore calls with zero arguments
(( $# == 0 )) && exit 0
# set extglob to activate extended pattern matching operators
shopt -s extglob
# assemble substituting string (turning the "r" to upper case, if it is lower case)
string="/help/releases/${1^r}/"
# pattern matches any release (the most recent one is not explicitly written in the url)
pattern="/help/?(releases/R20+([[:digit:]])@([ab])/)"
# send to qutebrowser
echo "open ${QUTE_URL/$pattern/$string}" >> "$QUTE_FIFO"