"diff" for reformatted code

This is a discussion on "diff" for reformatted code within the A Brief History of Cprogramming.com forums, part of the Community Boards category; some of you guys actually work in the field so I figure this might not be a bad place to ...

  1. #1
    pronounced 'fib' FillYourBrain's Avatar
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    "diff" for reformatted code

    some of you guys actually work in the field so I figure this might not be a bad place to ask.

    Here's the deal. I have been working on a compiler port project (Ada). The new compiler has a nasty little habit of reformatting code.

    diff can be case insensitive and ignore whitespace, but that's not enough. This compiler causes some things to drop down to the next line as well. needless to say, diff spits out everything of that type as a difference.

    has anyone seen a diff utility that understands code to some degree?
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

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    geek SilentStrike's Avatar
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    Is there someway that you could reformat either the original or the modified code to use the same coding convention? Something like running indent on the code before diff'ing?
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  3. #3
    & the hat of GPL slaying Thantos's Avatar
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    Don't know if this'll help but:
    old style assignment

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    Crazy Fool Perspective's Avatar
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    there are a few visual diffs that may help. Meld for example allows you to see the diffed files and move code back and fouth between them.

    http://www.icewalkers.com/Linux/Soft...8580/Meld.html

  5. #5
    and the hat of wrongness Salem's Avatar
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    > The new compiler has a nasty little habit of reformatting code.
    What - no "leave_my_code_alone" compiler option flag?

    Failing that, use "make" to copy all your proper source code to some temp area whilst it is compiled, so the compiler can mess with that copy (which will be deleted shortly anyway) and your proper code is unharmed (and diff-able).
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  6. #6
    pronounced 'fib' FillYourBrain's Avatar
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    Quote Originally Posted by SilentStrike
    Is there someway that you could reformat either the original or the modified code to use the same coding convention? Something like running indent on the code before diff'ing?
    If I could run the original stuff through the compiler, it would no doubt work this way, but the original doesn't compile in the new compiler and the major formatting changes happen at a later stage in the compile.

    Been through the drill. Very annoying.
    Quote Originally Posted by Salem
    > The new compiler has a nasty little habit of reformatting code.
    What - no "leave_my_code_alone" compiler option flag?

    Failing that, use "make" to copy all your proper source code to some temp area whilst it is compiled, so the compiler can mess with that copy (which will be deleted shortly anyway) and your proper code is unharmed (and diff-able).
    I wish there were a leave my code alone flag. Believe me I looked for it. The compiler is called Apex, and is a IBM/Rational product. Big piece of turd if you ask me. But it is what the army wanted.

    The make idea is brilliant. If I had done that from the beginning. Oh well.
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

  7. #7
    pronounced 'fib' FillYourBrain's Avatar
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    Thanks for the links. I'll check em out.
    "You are stupid! You are stupid! Oh, and don't forget, you are STUPID!" - Dexter

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