dotfiles/home/.config/shell/py-alias

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#!/usr/bin/env zsh
# Simple script which automatically defines certain aliases for python,
# which will automatically use certain python version
# Versions are automatically obtained from $PYENV_ROOT/versions directories
# NOTE: This assumes that all folders in this directory are valid python versions
#
# Assume we have these installed pyenv python versions 3.6.5, 3.6.12 and 3.10.1:
# - Set full-version aliases: py3.6.5, py3.6.12 and py3.10.1
# - Set py3 to 3.10.1 (latest with major version 3)
# - Set py3.6 to 3.6.12 (latest with major version 3 and minor version 6)
# - Set py3.10 to 3.10.1 (latest, and only python with major version 3 and minor version 10)
# Define all wanted aliases for a given python version
# $1 - full valid pyenv python version (for example '3.6.12', `3.11-dev`, or `pypy3.6-7.2.0-src`)
# $2 - version used in the alias (for example '3.6', '3', or even '', but also `pypy3.7`, ...)
define_aliases() {
version="$1"
alias_version="$2"
cmd_prefix="PYENV_VERSION=$version"
alias "py$alias_version=$cmd_prefix python"
alias "ipy$alias_version=$cmd_prefix ipython"
alias "bpy$alias_version=$cmd_prefix bpython"
alias "pydoc$alias_version=$cmd_prefix pydoc"
alias "pytest$alias_version=$cmd_prefix pytest"
}
# Handle splitting full version into prefix, version number and suffix
# Because of the huge variaty of python implemenations and their different namings,
# this function will only be able to handle the default CPython version names,
# which follow the regex pattern of: '\d+\.\d+\.\d+', the rest will print 'full_version;;'
# In the future, this may also include support for some other naming schemes.
# $1 - full valid pyenv python version (for example '3.6.12', `3.11-dev`, or `pypy3.6-7.2.0-src`)
parse_python_version() {
full_version="$1"
if echo "$full_version" | grep -E "[0-9]+\.[0-9]+\.[0-9]+" >/dev/null; then
echo ";$full_version;"
else
echo ';;'
fi
}
# Prints version number extracted from alias for given version
# $1 - version used in the alias (for example '3.6', '3', or even '', but also 'pypy3.6', ...)
get_alias_version() {
alias_version="$1"
definition="$(alias "py$alias_version")"
full_version="$(echo "$definition" | cut -d= -f3 | cut -d' ' -f1)"
version_info="$(parse_python_version "$full_version")"
version="$(echo "$version_info" | cut -d';' -f2)"
echo "$version"
}
# Compares 2 python versions in major, minor and micro parts
# $1 - version #1
# $2 - version #2
# Returns:
# 0 - version #1 is newer
# 1 - version #2 is newer
# 2 - versions are equal
version_compare() {
version_1="$1"
version_2="$2"
# ZSH Only:
version_1=("${(@s:.:)version_1}")
version_2=("${(@s:.:)version_2}")
major_1=$version_1[1]
major_2=$version_2[1]
minor_1=$version_1[2]
minor_2=$version_2[2]
micro_1=$version_1[3]
micro_2=$version_2[3]
# POSIX, but slow:
# major_1="$(echo "$version_1" | cut -d. -f1)"
# major_2="$(echo "$version_2" | cut -d. -f1)"
# minor_1="$(echo "$version_1" | cut -d. -f2)"
# minor_2="$(echo "$version_2" | cut -d. -f2)"
# micro_1="$(echo "$version_1" | cut -d. -f3)"
# micro_2="$(echo "$version_2" | cut -d. -f3)"
# Compare majors
if [ $major_1 -gt $major_2 ]; then
# version 1's major is bigger, version 1 is newer
return 0
elif [ $major_1 -lt $major_2 ]; then
# version 1's major is smaller, version 2 is newer
return 1
fi
# Majors equal, compare minors
if [ $minor_1 -gt $minor_2 ]; then
# version 1's minor is bigger, version 1 is newer
return 0
elif [ $minor_1 -lt $minor_2 ]; then
# version 1's major is smaller, version 2 is newer
return 1
fi
# Minors equal, compare micros
if [ $micro_1 -gt $micro_2 ]; then
# version 1's micro is bigger, version 1 is newer
return 0
elif [ $micro_1 -lt $micro_2 ]; then
# version 1's micro is smaller, version 2 is newer
return 1
fi
# Micros equal, versions equal
return 2
}
# Define new aliases if they don't already exsist, in which case override
# if the current version is newer than the version in the alias
# $1 - full valid pyenv python version (for example '3.6.12', `3.11-dev`, or `pypy3.6-7.2.0-src`)
# $2 - version used in the alias (for example '3.6', '3', or even '', but also `pypy3.7`, ...)
try_define_aliases() {
version="$1"
alias_version="$2"
# Check if alias already exists
if alias "py$alias_version" >/dev/null; then
# Compare version from the existing alias with current version,
# if current is newer, override the existing alias(es)
defined_version="$(get_alias_version "$alias_version")"
if version_compare "$version" "$defined_version"; then
define_aliases "$version" "$alias_version"
# echo "Overwrote '$alias_version' aliases to point to '$version'"
return 0
else
return 1
fi
fi
# The aliases aren't already defined, it's safe to create them
define_aliases "$version" "$alias_version"
# echo "Made '$alias_version' aliases pointing to '$version'"
return 0
}
define_version_aliases() {
prefix="$1"
version="$2"
suffix="$3"
# ZSH only:
version_data=("${(@s:.:)version}")
major_version=$version_data[1]
minor_version=$version_data[2]
# POSIX, but slow:
# major_version="$(echo "$version" | cut -d. -f1)"
# minor_version="$(echo "$version" | cut -d. -f2)"
# Define the major.minor.micro (full) alias
try_define_aliases "$version" "$prefix$version$suffix"
# Define the major.minor alias
try_define_aliases "$version" "$prefix$major_version.$minor_version$suffix"
# Define the major alias
try_define_aliases "$version" "$prefix$major_version$suffix"
# Define top level alias
try_define_aliases "$version" "$prefix$suffix"
}
for python_dir in "$PYENV_ROOT"/versions/*/ ; do
full_version="$(basename $python_dir)"
version_info="$(parse_python_version "$full_version")"
if [ $version_info = ';;' ]; then
# Version info wasn't obtained successfully, skip this version
echo "Skipped $full_version"
continue
fi
# ZSH only:
version_data=("${(@s:;:)version_info}")
prefix=$version_data[1]
version=$version_data[2]
suffix=$version_data[3]
# POSIX, but slow:
# prefix="$(echo "$version_info" | cut -d';' -f1)"
# version="$(echo "$version_info" | cut -d';' -f2)"
# suffix="$(echo "$version_info" | cut -d';' -f3)"
# startTime=$(date +%N)
define_version_aliases "$prefix" "$version" "$suffix"
# endTime=$(date +%N)
# nanos="$(expr $endTime - $startTime)"
# echo "took $(expr $nanos / 1000000) miliseconds"
done
if command -v poetry >/dev/null 2>&1; then
alias poetry-pyenv='poetry env use "$(pyenv which python)" && poetry install'
fi