Generate markdown table calendar. Use wiki links to individual days

md-cal.sh

# modified to use gdate for macos -- obtain 'gdate' by running `brew install coreutils`
startdate=2020-01-01
enddate=2020-12-31

# controls the link format for each day:
# [[ $linkformat | $displayformat ]]
linkformat="%Y-%b-%d-%a"
displayformat="%d"

# marker for empty days in calendar view
emptydays="❌"

monthHeadingLvl="# " # the heading used for the months
monthHeadingFormat="%B, %Y"

# table headers
hWeek="Week"
hMon="Mon"
hTue="Tue"
hWed="Wed"
hThu="Thu"
hFri="Fri"
hSat="Sat"
hSun="Sun"

# initialize the output file
echo "" > calendar.md
curr="$startdate"

while true; do
    echo "$curr"
    [ "$curr" \< "$enddate"  ] || break

    # Print the table header on the first day of the month
    if [ `gdate +%d --date "$curr"` == "01" ]; then

        # pad the end of the last month
        if [ `gdate +%a --date "$curr -1 day"` != "Sun" ] && [ `gdate +%b --date "$curr"` != "Jan" ] ; then

            # day in the week
            ndays=`gdate +%u --date "$curr"`
            
            # loop from last day to the end of the week
            for i in $(seq $ndays 7); do 
                echo -n "|$emptydays" >> calendar.md 
            done
            # close the last column
            echo -n "|" >> calendar.md
            
        fi

        # start a new month
        echo "  " >> calendar.md
        echo "  " >> calendar.md
        echo "$monthHeadingLvl" `gdate +"$monthHeadingFormat" --date "$curr"` >> calendar.md
        echo "| $hWeek | $hMon | $hTue | $hWed | $hThu| $hFri | $hSat | $hSun |" >> calendar.md
        echo "|:---:|:---:|:---:|:---:|:---:|:---:|:---:|:---:|" >> calendar.md
        
        # If the months first week doesnt start on Monday, pad it
        # and print the week number
        if [ `gdate +%a --date "$curr"` != "Mon" ]; then
            # print the week number
            echo -n "|" `gdate +%W --date "$curr"` >> calendar.md

            # day in the week
            ndays=`gdate +%u --date "$curr"`
            # minus one for padding
            ndays=`echo "$ndays-1" | bc`   
            
            # loop from Monday to the first day of the month
            for i in $(seq 1 $ndays); do 
                echo -n "|$emptydays" >> calendar.md 
            done
        fi
    fi

    # start the week row with the week number
    if [ `gdate +%a --date "$curr"` == "Mon" ]; then
        echo -n "|" `gdate +%W --date "$curr"` >> calendar.md
    fi

    # Main link output
	echo -n "| [[" `gdate +$linkformat --date "$curr"` "\| " `gdate +$displayformat --date "$curr"` "]]" >> calendar.md

    # End the row on Sunday
    if [ `gdate +%a --date "$curr"` == "Sun" ]; then
        echo "|" >> calendar.md
    fi

    # increment the date by one day
    curr=$( gdate +%Y-%m-%d --date "$curr +1 day" ) 
done

# print the last day and finish the month off
echo -n "| [[" `gdate +$linkformat --date "$curr"` "\| " `gdate +$displayformat --date "$curr"` "]]" >> calendar.md

# pad the end of the last month
if [ `gdate +%a --date "$curr"` != "Sun" ] ; then

    # day in the week
    ndays=`gdate +%u --date "$curr"`
    
    # loop from last day to the end of the week
    for i in $(seq $ndays 7); do 
        echo -n "|$emptydays" >> calendar.md 
    done
    # close the last column
    echo -n "|" >> calendar.md
    
fi