Simple bash function to detect venvs below the current directory.

venv_detector.sh

#!/bin/bash

venvs() {
    local DEPTH=3
    local OPTIND=1
    while getopts "l:" opt; do
        case $opt in
            l) DEPTH="$OPTARG" ;;
        esac
    done

    echo "Looking for venvs in current dir (recursion depth is $DEPTH; use -l argument to change)"

    VENVS=$(find . -maxdepth $DEPTH -type f -name pyvenv.cfg)


    local VENVS_WITH_ACTIVATE_SCRIPTS=()
    local ACTIVATE_SUFFIX="/bin/activate"
    for VENV in $VENVS; do
        local VENV_BASE=$(dirname "$VENV")
        local ACTIVATE_SCRIPT=$VENV_BASE$ACTIVATE_SUFFIX
        if [ -f "$ACTIVATE_SCRIPT" ]; then
            VENVS_WITH_ACTIVATE_SCRIPTS+=("$VENV_BASE")
        fi
    done

    if [ -z "$VENVS_WITH_ACTIVATE_SCRIPTS" ]; then
        echo "No venvs found"
        return 1
    fi

    echo "The virtual envs listed below were found. Pick the one to activate (^C to cancel):"
    select SCRIPT in "${VENVS_WITH_ACTIVATE_SCRIPTS[@]}"; do
        if [[ -n $SCRIPT ]]; then
            source "$SCRIPT$ACTIVATE_SUFFIX"
            break
        else
            echo "Invalid choice. Please try again."
        fi
    done
}