Create a markdown block from command output.

markcmd

#!/bin/bash
# markcmd
#
# Create a markdown block from command output.
#
# $ markcmd echo hi
# ```sh
# $ echo hi
# hi
# ```

function usage() {
   cat << 'EOF';
Usage: markcmd [-hcn] -- [command ...]
       -h   help, show usage (this)
       -c   copy to clipboard
       -n   dry run (don't execute command)
Execute a command and collect its output into a `markdown` block.
EOF
}

dry_run=0;
copy=0;
while getopts hnc opt; do
	case $opt in
        h) usage; exit;;
        n) dry_run=1;;
        c) copy=1;;
	    *) echo "error: invalid option given." >&2; usage;;
	esac
done
shift $[ OPTIND - 1 ];

if [ $# -eq 0 ]; then
   usage >& 2;
   exit 2;
fi

function run_block() {
    echo '```sh';
    echo "$ $*";
    if [ $dry_run -eq 1 ]; then
        echo "OMITTED (dry-run)";
    else
        $@;
    fi
    echo '```';
}

if [ $copy -eq 1 ]; then
    run_block $* | tee /dev/stderr | pbcopy;
else
    run_block $*;
fi