pyenv/libexec/pyenv-whence

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#!/usr/bin/env bash
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# Summary: List all Python versions that contain the given executable
# Usage: pyenv whence [--path] <command>
set -e
[ -n "$PYENV_DEBUG" ] && set -x
# Provide pyenv completions
if [ "$1" = "--complete" ]; then
echo --path
exec pyenv-shims --short
fi
if [ "$1" = "--path" ]; then
print_paths="1"
shift
else
print_paths=""
fi
whence() {
local command="$1"
pyenv-versions --bare | while read version; do
path="$(pyenv-prefix "$version")/bin/${command}"
if [ -x "$path" ]; then
[ "$print_paths" ] && echo "$path" || echo "$version"
fi
done
}
PYENV_COMMAND="$1"
if [ -z "$PYENV_COMMAND" ]; then
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pyenv-help --usage whence >&2
exit 1
fi
result="$(whence "$PYENV_COMMAND")"
[ -n "$result" ] && echo "$result"