This script configures system-wide defaults for Python and related tools installed via MacPorts

set-python-123.sh

#!/usr/bin/env bash
# ------------------------------------------------------------------------------
# Script : set-python-123.sh
# Author : Sébastien L.
#
# Description :
#   This script configures system-wide defaults for Python and related tools
#   installed via MacPorts. It uses `port select --set` to point commands like
#   `python`, `pip`, `cython`, `ansible`, etc. to a specific installed version.
#
#   By default, it targets Python 3.13 (MacPorts suffix: 313), but any other
#   version suffix can be passed as an argument (e.g. `312`, `311`, etc).
#
#   It supports the following tools:
#     - python, python3
#     - pip, pip3
#     - docutils
#     - cython
#     - ansible
#     - virtualenv
#     - fonttools
#
# Usage :
#   ./set-python-123.sh        # Defaults to 313 ("Python 3.13")
#   ./set-python-123.sh 312    # Sets to "Python 3.12" and related tools
#
# Notes :
#   - Each tool has a different selector naming pattern:
#   - Tools must be installed and properly registered in MacPorts selectors.
# ------------------------------------------------------------------------------

readonly NAME="$(basename "$0")"
readonly PYVERS="${1:-313}"  # e.g. 313 → "Python 3.13"
readonly SET="sudo port select --set"

# Colors
cRST='\033[0m'
cGreen='\033[32;1m'
cRed='\033[31;1m'
cYellow='\033[33;1m'
cPurple='\033[35;1m'

log()        { echo -e " ${cGreen}*${cRST} $*"; }
log_info()   { echo -e " ${cGreen}✔${cRST} $*"; }
log_warn()   { echo -e " ${cYellow}⚠ $*${cRST}" >&2; }
log_error()  { echo -e " ${cRed}❌ $*${cRST}" >&2; }
log_tool()   { printf " %bSelecting tool:%b %-20s\n" "$cPurple" "$cRST" "$1"; }

check_tools() {
  for tool in "$@"; do
    command -v "$tool" >/dev/null 2>&1 || {
      log_error "Missing tool: $tool"
      exit 1
    }
  done
}

select_tool() {
  local group="$1"
  local version="$2"
  log_tool "$group"
  if port installed "$version" >/dev/null 2>&1; then
    if $SET "$group" "$version" >/dev/null 2>&1; then
      log_info "$version selected"
    else
      log_error "$version is not a valid selection"
    fi
  else
    log_error "$version not installed"
  fi
}

[[ "$(uname)" != "Darwin" ]] && log_error "This script is for macOS only." && exit 1
check_tools port sudo

log "Configuring Python ${PYVERS} tools via MacPorts"

# Standard Python/pip group
select_tool python   "python${PYVERS}"
select_tool python3  "python${PYVERS}"
select_tool pip      "pip${PYVERS}"
select_tool pip3     "pip${PYVERS}"

# pyXY-docutils → group = docutils, version = py313-docutils
select_tool "docutils" "py${PYVERS}-docutils"
select_tool "ansible" "py${PYVERS}-ansible"

# Special: cython group expects version = cython313
select_tool "cython" "cython${PYVERS}"

# virtualenv: version = virtualenv313
select_tool "virtualenv" "virtualenv${PYVERS}"

# fonttools: version = fonttools-313
select_tool "fonttools" "fonttools-${PYVERS}"