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import functools |
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2
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import os |
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3
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import subprocess |
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4
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import sys |
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5
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6
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if sys.version_info >= (3, 9): |
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7
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from collections.abc import Callable |
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8
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9
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List = list |
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10
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Tuple = tuple |
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11
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12
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else: |
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from typing import Callable |
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from typing import List |
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from typing import Tuple |
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from typing import Optional |
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18
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20
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ERROR_CODE = -1 |
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21
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22
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23
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def find_executable( |
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name: str, |
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path: Optional[str]=None, |
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pathext: Optional[str]=None, |
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) -> Optional[str]: |
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28
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29
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if path is None: |
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30
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path = os.environ.get("PATH", "").split(os.pathsep) |
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32
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if isinstance(path, str): |
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33
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path = [path, ] |
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34
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35
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# check if there are path extensions for Windows executables |
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36
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if pathext is None: |
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pathext = os.environ.get("PATHEXT", ".COM;.EXE;.BAT;.CMD") |
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pathext = pathext.split(os.pathsep) |
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40
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# don't use extensions if the command ends with one of them |
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for ext in pathext: |
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if name.endswith(ext): |
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pathext = ["", ] |
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break |
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45
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46
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# check if we find the command on PATH |
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for p in path: |
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48
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f = os.path.join(p, name) |
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49
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if os.path.isfile(f): |
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return f |
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51
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52
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for ext in pathext: |
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fext = f + ext |
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if os.path.isfile(fext): |
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return fext |
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56
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57
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return None |
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58
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59
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60
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def popen_wrapper(args: List[str]) -> Tuple[str, str, int]: |
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""" |
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Friendly wrapper for Popen. |
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63
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64
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Returns stdout output, stderr output and OS status code. |
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65
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66
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""" |
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is_windows = (os.name == "nt") |
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68
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try: |
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69
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p = subprocess.Popen( |
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70
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args, |
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shell=False, |
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72
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stdout=subprocess.PIPE, |
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stderr=subprocess.PIPE, |
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close_fds=(not is_windows), |
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) |
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except OSError as e: |
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raise OSError(f"failed to execute '{args[0]}'") from e |
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else: |
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output, errors = p.communicate() |
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80
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return ( |
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output.decode("utf-8"), |
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errors.decode("utf-8"), |
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p.returncode |
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) |
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85
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86
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87
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def halt() -> None: |
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sys.exit(ERROR_CODE) |
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89
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90
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91
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def show_usage_error_and_halt() -> None: |
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print_err("run the command with -h/--help flag for usage information") |
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halt() |
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94
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95
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96
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def _wrap_writer(writer: Callable[[str], None]) -> Callable[[str], None]: |
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97
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98
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@functools.wraps(writer) |
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99
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def wrapped(s: str) -> None: |
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100
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writer(f"{s}\n") |
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101
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102
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return wrapped |
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103
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104
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105
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print_out = _wrap_writer(sys.stdout.write) |
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106
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print_err = _wrap_writer(sys.stderr.write) |
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107
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oblalex /
verboselib
