Commits on May 23, 2020

1. feat: Perform a less invasive buffer content replacement operation …

   Borrowed from go-mode's gofmt and releated functions:
   https://github.com/dominikh/go-mode.el/blob/734d5232455ffde088021ea5908849ac570e890f/go-mode.el#L1850-L1956
   
   Hence I'm not the original author of most this code, but I have used a
   number of borrowed variations of it over the years for hand-rolled
   formatting solutions.
   
   It works by passing the current buffer content to `diff` via STDIN to
   compare it against the target file on disk producing a RCS formatted
   diff that is easy to parse. It then iterates through the said diff only
   modifying relevant lines to make the buffer be identical to the target
   file.
   
   In my experience it does a much better job of maintaining cursor
   position compared to `insert-file-contents`, as it only modifies lines
   that got corrected, and leaves all other lines in the buffer untouched.
   
   Performance is also excellent and near instant. On my late-2016 13-inch
   MacBook Pro with a Dual-Core i7 at 3.3Ghz, I can't really tell the
   difference between this solution and `insert-file-contents`.
   
   I did also test it against the Haskell example from:
   purcell#19
   
   Replacing buffer content of `Req.hs` with that of `Req-reformatted.hs`
   is most of the time just as fast as `insert-file-contents` (around
   50ms), and only sometimes a little slower of around 100-150ms based on
   my totally unscientific measurement technique of guesstimating it. I
   find that rather impressive as the RCS-formatted diff itself is 17KB.
   
   I also tested the old `replace-buffer-contents`-based variant to see how
   it performs on my machine. It took around 15 seconds.

   

   jimeh committed May 23, 2020
   Configuration menu

   • View commit details
   • Copy full SHA for 6186783
   • Browse repository at this point

   Copy the full SHA

   6186783 View commit details

   Browse the repository at this point in the history