Coverage for python/lsst/ctrl/mpexec/cli/script/confirmable.py: 34%

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1# This file is part of ctrl_mpexec. 

2# 

3# Developed for the LSST Data Management System. 

4# This product includes software developed by the LSST Project 

5# (http://www.lsst.org). 

6# See the COPYRIGHT file at the top-level directory of this distribution 

7# for details of code ownership. 

8# 

9# This program is free software: you can redistribute it and/or modify 

10# it under the terms of the GNU General Public License as published by 

11# the Free Software Foundation, either version 3 of the License, or 

12# (at your option) any later version. 

13# 

14# This program is distributed in the hope that it will be useful, 

15# but WITHOUT ANY WARRANTY; without even the implied warranty of 

16# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 

17# GNU General Public License for more details. 

18# 

19# You should have received a copy of the GNU General Public License 

20# along with this program. If not, see <http://www.gnu.org/licenses/>. 

21 

22 

23from abc import ABC, abstractmethod 

24from typing import Callable 

25 

26import click 

27 

28 

29class ConfirmableResult(ABC): 

30 

31 """Interface for a results class that can be used by the `confirm` 

32 function.""" 

33 

34 @abstractmethod 

35 def describe(self, will: bool) -> str: 

36 """Get a message describing what will be or was done. This is printed 

37 just before "Continue?" on the CLI, if confirming, or just before 

38 "Done." if confirmation is being skipped. 

39 

40 Parameters 

41 ---------- 

42 will : bool 

43 True if confirmation is being requested, False if --no-confirm was 

44 used, and the action is completed. 

45 """ 

46 pass 

47 

48 @abstractmethod 

49 def on_confirmation(self) -> None: 

50 """Performs the action that was returned from `describe`. This is 

51 Called just after the user has confirmed (if needed).""" 

52 pass 

53 

54 @property 

55 @abstractmethod 

56 def failed(self) -> bool: 

57 """Query if there was a failure preparing the ConfirmableResult, 

58 before `on_confirmation` is called.""" 

59 pass 

60 

61 @property 

62 @abstractmethod 

63 def describe_failure(self) -> str: 

64 """Get a message describing the failure. This is used as the message 

65 when raising a `ClickException` to stop with exit code 1.""" 

66 pass 

67 

68 @property 

69 @abstractmethod 

70 def can_continue(self) -> bool: 

71 """Query if the ConfirmableResult can continue. Returns `False` if 

72 there is no work to be done.""" 

73 pass 

74 

75 

76def confirm(script_func: Callable[[], ConfirmableResult], confirm: bool) -> ConfirmableResult: 

77 result = script_func() 

78 if result.failed: 

79 raise click.ClickException(result.describe_failure) 

80 if not result.can_continue: 

81 print(result.describe(will=True)) 

82 return result 

83 if confirm: 

84 print(result.describe(will=True)) 

85 if result.can_continue: 

86 do_continue = click.confirm("Continue?", default=False) 

87 else: 

88 do_continue = True 

89 if not do_continue: 

90 print("Aborted.") 

91 else: 

92 result.on_confirmation() 

93 if not confirm: 

94 print(result.describe(will=False)) 

95 else: 

96 print("Done.") 

97 return result