mirror of https://github.com/djcb/mu.git
flags: add flags_keep_unmutable + test
When moving we want to maintain _some_ flags; add a function making that convenient.
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@ -150,6 +150,18 @@ test_flags_filter()
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}
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[[maybe_unused]] static void
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test_flags_keep_unmutable()
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{
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static_assert(flags_keep_unmutable((Flags::Seen|Flags::Passed),
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(Flags::Flagged|Flags::Draft),
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Flags::Replied) ==
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(Flags::Flagged|Flags::Draft));
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}
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#ifdef BUILD_TESTS
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int
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main(int argc, char* argv[])
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@ -164,6 +176,8 @@ main(int argc, char* argv[])
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test_flags_from_delta_expr);
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g_test_add_func("/message/flags/flags-filter",
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test_flags_filter);
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g_test_add_func("/message/flags/flags-keep-unmutable",
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test_flags_keep_unmutable);
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return g_test_run();
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}
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@ -338,6 +338,28 @@ flags_filter(Flags flags, MessageFlagCategory cat)
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return flags;
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}
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/**
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* Return flags, where flags = new_flags but with unmutable_flag in the
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* result the same as in old_flags
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*
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* @param old_flags
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* @param new_flags
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* @param unmutable_flag
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*
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* @return
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*/
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constexpr Flags
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flags_keep_unmutable(Flags old_flags, Flags new_flags, Flags unmutable_flag)
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{
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if (any_of(old_flags & unmutable_flag))
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return new_flags | unmutable_flag;
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else
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return new_flags & ~unmutable_flag;
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}
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/**
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* Get a string representation of flags
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*
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