git_ext_diff

#!/usr/bin/env python3

'''
  A driver script for Diff/AST

  Copyright 2025 Codinuum Software Lab <https://codinuum.com>

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
'''

import sys
import os
import subprocess

EXTS = set([
    'java',
    'py',
    'v',
    'f', 'F', 'for', 'FOR', 'f77', 'F77',
    'f90', 'F90', 'f95', 'F95', 'f03', 'F03', 'f08', 'F08',
    'c', 'h', 'cc', 'hh', 'cpp', 'hpp', 'C', 'H',
])

#

DIFFAST_CMD = '/opt/cca/bin/diffast.exe'
VIEWER_CMD = '/opt/cca/bin/diffviewer/run.py'

DIST_DIR = os.path.dirname(os.path.realpath(sys.argv[0]))
if not os.path.exists(DIFFAST_CMD):
    DIFFAST_CMD = os.path.join(DIST_DIR, 'dist', 'bin', 'diffast.exe')
if not os.path.exists(VIEWER_CMD):
    VIEWER_CMD = os.path.join(DIST_DIR, 'diffviewer', 'run.py')

#

DIFFAST_CMD_FMT = f'{DIFFAST_CMD} -dump:delta {{}} {{}}'
VIEWER_CMD_FMT = f'{VIEWER_CMD} --foreground {{}} {{}}'

DIFF_CMD_FMT = 'diff -u {} {}'

#


def is_src(path):
    _, _ext = os.path.splitext(path)
    ext = _ext[1:]
    b = False
    try:
        b = ext in EXTS
    except Exception:
        pass
    return b


def diff(file1, file2):
    cmd = DIFF_CMD_FMT.format(file1, file2)
    subprocess.run(cmd, shell=True, universal_newlines=True)


def diffast(file1, file2):
    diffast_cmd = DIFFAST_CMD_FMT.format(file1, file2)
    p = subprocess.run(diffast_cmd, shell=True, universal_newlines=True)
    if p.returncode == 0:
        viewer_cmd = VIEWER_CMD_FMT.format(file1, file2)
        subprocess.run(viewer_cmd, shell=True, universal_newlines=True)


def main():
    args = sys.argv[1:]

    file1 = args[0]
    file2 = args[1]

    file1_is_src = is_src(file1)
    file2_is_src = is_src(file2)

    if file1_is_src and file2_is_src:
        print(f'\nSource file comparison found: {file1} {file2}', flush=True)
        while True:
            a = input('Do you want to launch diffast (y/n)? ')
            if a == 'y':
                break
            elif a == 'n':
                return

        print('launching diffast...', flush=True)
        diffast(file1, file2)
        # diff(file1, file2)  # for testing
    else:
        print('.', end='', flush=True)


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        pass