git calendar

This is a script I wrote to render GitHub/GitLab like contributions calendar for local repositories, it should render something like this

file: git_calendar.sh

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#!/bin/bash
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PROJECTS_DIR="$( dirname $PWD )"
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AUTHOR_EMAIL="$( git config --get --global user.email )"
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OUTPUT_FILE="$( realpath static/images/git_calendar.svg )"
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TEMP_FILE="$( mktemp )"
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for REPO in $( find "${PROJECTS_DIR}" \
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    -type d -name '.git' -printf '%h\n' )
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do
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    cd "${REPO}"
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    git log --all --format=tformat:%as --author="${AUTHOR_EMAIL}" \
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        >> "${TEMP_FILE}"
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done
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cd "${PROJECTS_DIR}"
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cat << SVG_BEGIN_BLOCK > "${OUTPUT_FILE}"
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<svg width="840" height="168" version="1.1" viewBox="0 0 840 168" xmlns="http://www.w3.org/2000/svg">
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<style>
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    .dt { font: 12px monospace }
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    .sq { width: 12px; height: 12px; rx: 2px; ry: 2px; }
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    .f0 { fill: rgb(245,245,255); }
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    .f1 { fill: rgb(205,205,255); }
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    .f2 { fill: rgb(155,155,255); }
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    .f3 { fill: rgb(105,105,255); }
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    .f4 { fill: rgb(55,55,255); }
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    .f5 { fill: rgb(5,5,255); }
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</style>
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<text x="20" y="60" class="dt">Sun</text>
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<text x="20" y="88" class="dt">Tue</text>
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<text x="20" y="116" class="dt">Thu</text>
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SVG_BEGIN_BLOCK
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TODAY="$( date +'%w:%a, %d %B %Y' )"
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LASTYEAR="$( date -d 'last year' +'%w:%a, %d %B %Y' )"
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TOMORROW="$( date -d 'tomorrow' +'%w:%a, %d %B %Y' )"
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DATE_POINTER="${LASTYEAR}"
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MONTH_TAG=""
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COLUMN=0
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while [ "${DATE_POINTER}" != "${TOMORROW}" ]; do
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    ROW=$(( ( ${DATE_POINTER%:*} + 1 ) % 7 ))
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    MONTH="$( date -d "${DATE_POINTER#*:}" +'%b' )"
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    if [ $ROW -eq 0 ] && [ "${MONTH_TAG}" != "${MONTH}" ]; then
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        MONTH_TAG="${MONTH}"
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        printf '<text x="%s" y="32" class="dt">%s</text>' \
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            "$(( ( COLUMN * 14 ) + 48 ))" \
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            "${MONTH_TAG}" >> "${OUTPUT_FILE}"
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    fi
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    printf '<rect class="sq %s" x="%s" y="%s"><title>%s commits on %s</title></rect>\n' \
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        "f0" \
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        "$(( ( COLUMN * 14 ) + 48 ))" \
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        "$(( ( ROW * 14 ) + 36 ))" \
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        "No" \
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        "${DATE_POINTER#*:}" >> "${OUTPUT_FILE}"
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    [ $ROW -eq 6 ] && (( COLUMN++ ))
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    DATE_POINTER="$( date -d "${DATE_POINTER#*:} + 1 day" +'%w:%a, %d %B %Y' )"
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done
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sort "${TEMP_FILE}" | uniq -c | while read COMMITS DATE; do
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LEVEL=$(( ( COMMITS / 5 ) + 1 ))
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[ ${LEVEL} -gt 5 ] && LEVEL=5
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LEVEL="f${LEVEL}"
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DATE_STR="$( date -d "${DATE}" +'%a, %d %B %Y' )"
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sed -i -E "s/(^.*)(f0)(.*)(No)(.*)(${DATE_STR})(.*$)/\1${LEVEL}\3${COMMITS}\5\6\7/" "${OUTPUT_FILE}"
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done
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cat << SVG_END_BLOCK >> "${OUTPUT_FILE}"
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<text x="20" y="150" class="dt">Generated ${TODAY#*:}</text>
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<text x="480" y="150" class="dt">Hover on the boxes for details</text>
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<rect class="sq f0" x="720" y="140"><title>No commits</title></rect>
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<rect class="sq f1" x="734" y="140"><title>1 to 5 commits</title></rect>
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<rect class="sq f2" x="748" y="140"><title>6 to 10 commits</title></rect>
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<rect class="sq f3" x="762" y="140"><title>11 to 15 commits</title></rect>
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<rect class="sq f4" x="776" y="140"><title>15 to 20 commits</title></rect>
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<rect class="sq f5" x="790" y="140"><title>21+ commits</title></rect>
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</svg>
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SVG_END_BLOCK
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rm "${TEMP_FILE}"
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