chpythonz/chpythonz.sh at master · RFGMM/chpythonz · GitHub

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CHPYTHON_VERSION='0.1.0.dev'
PYTHONS=()

[ -d"${HOME}/.pythonz/pythons" ] && PYTHONS+=("${HOME}/.pythonz/pythons"/*)

function_chpython_exec {
local python
 python=$1
shift
# TODO: Clear path so invoking `chpython 3.5 python -V` when
# $CHPYTHON_VERSION is set to a 2.x Python gives a command not
# found error instead of running $CHPYTHON_VERSION/bin/python.
 env PATH="$python/bin:$PATH"$*
}

function_chpython_reset {
 [ -z"$CHPYTHON_ROOT" ] &&return
 PATH=":$PATH:"
 PATH=${PATH//:$CHPYTHON_ROOT\/bin:/:}
 PATH=${PATH#:}; PATH=${PATH%:}
unset CHPYTHON_ROOT
hash -r
type python ||type python3
}

function_chpython_select {
local dir python match
fordirin${PYTHONS[@]};do
 dir=${dir%%/}
 python=${dir##*/}
case"$python"in
"$1")
# Match using 3-part version number, e.g. `chruby 2.7.10`
 match=$dir&&break
 ;;
"$1"*)
# Match best using 2-part version number, e.g., `chpython 2.7`
 match=$dir
 ;;
esac
done
echo"$match"
}

function_chpython_use {
if [[ !-x"$1/bin/python"&&!-x"$1/bin/python3" ]];then
echo"chpython: neither $1/bin/python nor $1/bin/python3 are executable">&2
return 1
fi

# TODO: Alias *3 stuff to base name, so, e.g., `python` can be called
# instead of `python3`

export CHPYTHON_ROOT=$1
export PATH="${CHPYTHON_ROOT}/bin:${PATH}"
hash -r
type python ||type python3
}

functionchpython {
case"$1"in
 -h|--help)
 cat <<EOS
Usage:
 chpython [PYTHON|VERSION|system]
 chpython exec [PYTHON|VERSION] args...
EOS
 ;;
 -V|--version)
echo"chpython $CHPYTHON_VERSION"
 ;;
 exec)
shift
local match
 match=$(_chpython_select $1)
if [ -z"$match" ];then
echo"chpython: unknown Python: $1">&2
return 1
fi

shift
 _chpython_exec $match$*
 ;;
 system)
 _chpython_reset
 ;;
"")
local dir python
fordirin"${PYTHONS[@]}";do
 dir="${dir%%/}"; python="${dir##*/}"
if [[ "$dir"=="$CHPYTHON_ROOT" ]];then
echo" * ${python}"#${RUBYOPT}"
else
echo"${python}"
fi

done
 ;;
*)
local match
 match=$(_chpython_select $1)
if [ -z"$match" ];then
echo"chpython: unknown Python: $1">&2
return 1
fi

shift
 _chpython_use $match$*
 ;;
esac
}