Michael Haggerty <mhag...@alum.mit.edu> writes:

> The idea of xdl_change_compact() is fairly simple:
> * Proceed through groups of changed lines in the file to be compacted,
>   keeping track of the corresponding location in the "other" file.
> * If possible, slide the group up and down to try to give the most
>   aesthetically pleasing diff. Whenever it is slid, the current location
>   in the other file needs to be adjusted.
> But these simple concepts are obfuscated by a lot of index handling that
> is written in terse, subtle, and varied patterns. I found it very hard
> to convince myself that the function was correct.
> So introduce a "struct group" that represents a group of changed lines
> in a file. Add some functions that perform elementary operations on
> groups:
> * Initialize a group to the first group in a file
> * Move to the next or previous group in a file
> * Slide a group up or down
> Even though the resulting code is longer, I think it is easier to
> understand and review.

Yup.  The important thing is that the length of the core logic of
sliding up and down becomes easier to read, because it shrinks; the
mechanics of sliding up and down may need more lines with boilderplate,
but they are isolated "do one thing and do it well" helpers.


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