generate

#!/bin/bash
set -e  # crash on any error
set -u  # crash on undefined vars

# TODO: Doesn't work on MACs AFAIK due to missing realpath
PROJECT_ROOT=$(dirname $(realpath "$0"))

# TODO: Sensible fallback
HTML_ROOT="${HTML_ROOT-/var/www/quinox/processing}"
INDEXFILE="${HTML_ROOT}/index.html"
SOLUTIONS_ROOT="${PROJECT_ROOT}/solutions"
MISC_ROOT="${PROJECT_ROOT}/misc"

log() {
    >&2 echo "$(date) $*"
}

die() {
    >&2 echo "$*"
    exit 1
}

copy() {
    log "Copying $1..."
    cp "$1" "$HTML_ROOT"
}

join_array() {
    end_of_line="$1"
    shift
    for element in "$@"
    do
        echo "$element$end_of_line"
    done
}



# Sanity checks
[ -d "$HTML_ROOT" ] || die "The specified \$HTML_ROOT does not exist: $HTML_ROOT. Please create it."
[ -e "$INDEXFILE" ] && die "The file $INDEXFILE already exists, please remove it before running this command."


# Real run
[ -d "$HTML_ROOT/solutions" ] || mkdir "$HTML_ROOT/solutions"
copy "$MISC_ROOT/processing.min.js"
copy "$MISC_ROOT/p5.min.js"
copy "$SOLUTIONS_ROOT/library.js"

cd "$SOLUTIONS_ROOT"


do_processing() {
    solutions_as_ul=()
    for i in *.pde
    do
        log "Copying $i ..."
        solutions_as_ul+=("<li><a href='$i.html'>$i</a></li>")
        cp "$SOLUTIONS_ROOT/$i" "$HTML_ROOT/solutions/$i"
        cp "$MISC_ROOT/template_processingjs.html" "$HTML_ROOT/$i.html"
        sed -i "
        s#%FILENAME%#$i#g;
        s#%FILEPATH%#solutions/$i#g;
        s#%GENERATED%#$(date)#g;
        s#%TIMESTAMP%#$(stat -c "%y" "$SOLUTIONS_ROOT/$i")#g;
        " "$HTML_ROOT/$i.html"
    done
    solutions_as_ul_html=$(join_array '' "${solutions_as_ul[@]}")
    echo "$solutions_as_ul_html"
}

do_p5() {
    solutions_as_ul=()
    for i in exercise*.js
    do
        log "Copying $i ..."
        solutions_as_ul+=("<li><a href='$i.html'>$i</a></li>")
        cp "$SOLUTIONS_ROOT/$i" "$HTML_ROOT/solutions/$i"
        cp "$MISC_ROOT/template_p5.html" "$HTML_ROOT/$i.html"
        sed -i "
        s#%FILENAME%#$i#g;
        s#%FILEPATH%#solutions/$i#g;
        s#%GENERATED%#$(date)#g;
        s#%TIMESTAMP%#$(stat -c "%y" "$SOLUTIONS_ROOT/$i")#g;
        " "$HTML_ROOT/$i.html"
    done
    solutions_as_ul_html=$(join_array '' "${solutions_as_ul[@]}")
    echo "$solutions_as_ul_html"
}

# If tac isn't available use echo; the list won't be reversed but at least the
# HTML will be generated

solutions_as_ul_reversed=$( { do_processing; do_p5; } | tac || echo "$solutions_as_ul_html" )
solutions_as_ul_reversed_no_newlines=$(echo "$solutions_as_ul_reversed" | tr -d '\n')

log "Generating index.html ..."
cp "${MISC_ROOT}/index.html" "$HTML_ROOT/index.html"
sed -i "
s#%SOLUTIONS%#${solutions_as_ul_reversed_no_newlines}#g;
s#%GENERATED%#$(date)#g;
" "$HTML_ROOT/index.html"

log "Done."