> On Jan 26, 2017, at 11:38 AM, Graydon Hoare <gho...@apple.com> wrote: > > >> On Jan 26, 2017, at 2:07 AM, Andrew Trick via swift-dev >> <swift-dev@swift.org> wrote: >> >> Before I pull in a large PR that "accidentally" reformats a bunch of code, I >> want to get feedback on how Swift compiler devs plan to use `clang-format`. >> (BTW, here's the PR https://github.com/apple/swift/pull/6922). >> >> During the code review, I ran `git clang-format` as part of being a good >> citizen. There's only one problem with the tool. It rewraps long boolean >> expressions, hiding those unsightly operators at the end of lines (after all >> who wants to see those?). >> >> if (some_expression->with_calls() || >> another_expression->with(nested_calls()) && >> an_even_longer_expression->making_your_eyes->glaze_over()) >> >> I don't get involved in style wars, but this is not a style change, it's an >> objective code quality degradation. It's a demonstrably bug-prone thing to >> do. It's hurt me too many times in the past, and I'm not happy using a >> formatting tool that injects future bugs and harms code comprehension. > > It's funny you'd mention this! I often format code that way, not out of any > great love of it, but from muscle-memory of living under an old coding > guideline somewhere in the distant past claiming that the ugliness of > trailing unfinished-binops draws the eye to them and makes the user pay > attention. Doug Crockford recommends this style; but of course Don Knuth > agrees with you. I don't feel strongly about them as such, but I feel ... > anti-strongly, I guess? Like changing that one thing isn't worth a > cross-codebase rewrite / merge collision.
I’m not sure who’s recommending what. The above style obscures operators. Does anyone disagree with that? A lot of code has been written in that way; I think because developers value aesthetics over clarity, or just don’t think about it. I care because when something doesn’t stand out, my brain fills in the gaps with whatever it expects. For me, that leads to a bunch of silly logic errors. I need to see it this way: if (some_expression->with_calls() || another_expression->with(nested_calls()) && an_even_longer_expression->making_your_eyes->glaze_over()) The need for parens now stands out. Sorry this isn’t a good example. Nested expressions would make it much more compelling. That’s the coding convention we use for Swift code (at least in the stdlib). The compiler C++ code is just a hodge-podge. If anyone actually thinks trailing operators are a good idea for our code base, I won’t argue, but I’ve never heard that argument. BTW- I’m not interested at all in doing a mass reformatting or forcing a convention on people. I just don’t want to apply clang-format to every line of code I touch without knowing what settings to use. -Andy _______________________________________________ swift-dev mailing list swift-dev@swift.org https://lists.swift.org/mailman/listinfo/swift-dev