Coverage for python/lsst/ctrl/mpexec/cli/script/confirmable.py: 53%

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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 software is dual licensed under the GNU General Public License and also 

10# under a 3-clause BSD license. Recipients may choose which of these licenses 

11# to use; please see the files gpl-3.0.txt and/or bsd_license.txt, 

12# respectively. If you choose the GPL option then the following text applies 

13# (but note that there is still no warranty even if you opt for BSD instead): 

14# 

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

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

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

18# (at your option) any later version. 

19# 

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

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

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

23# GNU General Public License for more details. 

24# 

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

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

27 

28 

29from abc import ABC, abstractmethod 

30from collections.abc import Callable 

31 

32import click 

33 

34 

35class ConfirmableResult(ABC): 

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

37 function. 

38 """ 

39 

40 @abstractmethod 

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

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

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

44 "Done." if confirmation is being skipped. 

45 

46 Parameters 

47 ---------- 

48 will : bool 

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

50 used, and the action is completed. 

51 """ 

52 pass 

53 

54 @abstractmethod 

55 def on_confirmation(self) -> None: 

56 """Perform the action that was returned from `describe`. 

57 

58 This is Called just after the user has confirmed (if needed). 

59 """ 

60 pass 

61 

62 @property 

63 @abstractmethod 

64 def failed(self) -> bool: 

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

66 before `on_confirmation` is called. 

67 """ 

68 pass 

69 

70 @property 

71 @abstractmethod 

72 def describe_failure(self) -> str: 

73 """Get a message describing the failure. 

74 

75 This is used as the message when raising a `~click.ClickException` to 

76 stop with exit code 1. 

77 """ 

78 pass 

79 

80 @property 

81 @abstractmethod 

82 def can_continue(self) -> bool: 

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

84 there is no work to be done. 

85 """ 

86 pass 

87 

88 

89def confirm(script_func: Callable[[], ConfirmableResult], confirm: bool) -> ConfirmableResult: 

90 """Prompt user to continue. 

91 

92 Parameters 

93 ---------- 

94 script_func : `~collections.abc.Callable` 

95 Script function to call. 

96 confirm : `bool` 

97 Whether confirmation is required. 

98 

99 Returns 

100 ------- 

101 result : `ConfirmableResult` 

102 Confirmation from script function. 

103 """ 

104 result = script_func() 

105 if result.failed: 

106 raise click.ClickException(result.describe_failure) 

107 if not result.can_continue: 

108 print(result.describe(will=True)) 

109 return result 

110 if confirm: 

111 print(result.describe(will=True)) 

112 if result.can_continue: 

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

114 else: 

115 do_continue = True 

116 if not do_continue: 

117 print("Aborted.") 

118 else: 

119 result.on_confirmation() 

120 if not confirm: 

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

122 else: 

123 print("Done.") 

124 return result