start.sh

#!/usr/bin/env bash
set -e

if ! command hypercorn &>/dev/null; then
    if [ ! -d ".venv" ]; then
        echo "Creating virtual environment"
        rm -f ".cur_branch"
        python -m venv --system-site-packages .venv
    fi  

    if [ -z "$VIRTUAL_ENV" ]; then
        echo "Switching to runtime environment..."
        source ".venv/bin/activate"
    fi

    _git_branch="$(git rev-parse --abbrev-ref HEAD)"
    if [ -f ".cur_branch" ]; then
        _cur_branch="$(cat .cur_branch 2>/dev/null)"
    else
        _cur_branch=""
    fi

    if [ "$_git_branch" != "$_cur_branch" ]; then
        echo "Reviewing dependency requirements, view .pip.log for details..."
        date >>".pip.log"
        pip --disable-pip-version-check install -r requirements.txt &>>".pip.log"
    fi

    echo "$_git_branch">".cur_branch"
fi

HTTP_HOST="${HTTP_HOST:-$HOSTNAME}"

HTTP_PORT="$(echo "$USER" | pcre2grep -o1 '(\d+)$' | xargs -I {} echo '9000+{}' | bc)"
HTTP_PORT="${HTTP_PORT:-9000}"

if [ "$HTTP_PORT" -ge 9000 ]; then
    ID="$(echo "$HTTP_PORT - 9000" | bc)"
    BIND="$HTTP_HOST:$HTTP_PORT"

    if curl -so /dev/null "$BIND"; then
        ./stop.sh
        echo "Re-starting service on $BIND..."
    else
        echo "Starting service $BIND..."
    fi
    
    hypercorn --debug --bind "$BIND" --log-level info --root-path="/$ID" "main:app" &>".main.log" &

    n=0 
    started=0
    while [ $started -eq 0 ] && [ $n -lt 10 ]; do
        n=$((n + 1))
        if curl -so /dev/null "$BIND"; then
            started=1
        else
            echo "Waiting 100ms for service to appear..."
            sleep 0.1 
        fi
    done

    if [ $started -eq 0 ]; then
        >&2 echo "Service failed to start in time, displaying log..."
        cat ".main.log" | less
        exit 1
    else
        # Watch for file changes, and restart if true...

        cp ".new_files" ".current_files" &>/dev/null

        (
        while ./pid.sh >/dev/null; do
            sleep 0.5
            find . -type f -regex '.*\(\.html\|\.py\)' -not -path "./.venv/*" -not -path "./__pycache__/*" -printf "%p %TY-%Tm-%Td %TH:%TM:%TS %Tz\n" | sort -n >".new_files"

            if [ -f ".current_files" ]; then
                if ! cmp -s ".new_files" ".current_files"; then
                    break
                fi
            fi
            
            cp ".new_files" ".current_files" &>/dev/null
        done

        if ./pid.sh >/dev/null; then
            ./start.sh 1>/dev/null
        fi
        ) &
    fi  

    tail ".main.log"
else
    >&2 echo "Invalid port $HTTP_PORT"
    exit 1
fi