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#!/usr/bin/env python
# coding: utf-8
# Copyright (c) 2022 Nagarjuna Kumarappan
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# Author: Nagarjuna Kumarappan <nagarjuna.412@gmail.com>
from shutil import which
import os
import tempfile
# constants
FZF_URL = "https://github.com/junegunn/fzf"
class FzfPrompt:
def __init__(self, executable_path=None):
if executable_path:
self.executable_path = executable_path
elif not which("fzf") and not executable_path:
raise SystemError(
f"Cannot find 'fzf' installed on PATH. ({FZF_URL})")
else:
self.executable_path = "fzf"
def prompt(self, choices=None, fzf_options="", delimiter='\n'):
# convert lists to strings [ 1, 2, 3 ] => "1\n2\n3"
choices_str = delimiter.join(map(str, choices))
selection = []
with tempfile.NamedTemporaryFile(delete=False) as input_file:
with tempfile.NamedTemporaryFile(delete=False) as output_file:
# Create an temp file with list entries as lines
input_file.write(choices_str.encode('utf-8'))
input_file.flush()
# Invoke fzf externally and write to output file
os.system(
f"{self.executable_path} {fzf_options} < \"{input_file.name}\" > \"{output_file.name}\"")
# get selected options
with open(output_file.name, encoding="utf-8") as f:
for line in f:
selection.append(line.strip('\n'))
os.unlink(input_file.name)
os.unlink(output_file.name)
return selection
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