Bubble up package documentation changes

[johnf]

Hi,

I'm one of those people that loves t live on the cutting edge and runs PackeSync every morning. I usually scan the diff and the keythink I'm looking for is any new functionality I can play with or changes I should make. Typically most of the commits are uninteresting (to me) as I'm not into vim plugin development itself.

I thought it might be handy to display diff entries only for changes to README and vim docs. As I was starting to hack around I realised to can do this mostly from a config perspective by using

config = {
  git = {
    subcommands = {
      diff         = 'log --color=never --pretty=format:FMT --no-show-signature HEAD@{1}...HEAD **/*.[mM][dD] **/*.[tT][xX][tT]',
      git_diff_fmt = 'show --no-color --pretty=medium %s **/*.[mM][dD] **/*.[tT][xX][tT]',
      get_header   = 'log --color=never --pretty=format:FMT --no-show-signature HEAD -n 1 **/*.[mM][dD] **/*.[tT][xX][tT]',
      get_bodies   = 'log --color=never --pretty=format:"===COMMIT_START===%h%n%s===BODY_START===%b" --no-show-signature HEAD@{1}...HEAD **/*.[mM][dD] **/*.[tT][xX][tT]',
    },
  },
}

@wbthomason Would you be interested in a PR that made this corefunctionality with a config option to be able to only display commits with changes to .txt and .md files? perhaps with a keyboard shortcut to toggle them on and off.