ignore lines with particular words in vimdiff output

Question

I have 2 large files to take vimdiff. In vimdiff output I want to ignore lines showing diff but have a particular word.

e.g. in my case I want to ignore diff of all lines with prefix WARNING: in my files.

Thanks,

Answer 1

I've looked for a solution to this for a long time and I found the EnhancedDiff plugin to be the easiest solution which makes your diffs slightly more intelligent to begin with :)

1. Installation (https://github.com/chrisbra/vim-diff-enhanced#installation)

Use the plugin manager of your choice:

• Pathogen
  • git clone https://github.com/chrisbra/vim-diff-enhanced.git ~/.vim/bundle/vim-enhanced-diff
  • :Helptags (only needed once after the installation to install the documentation)
• NeoBundle
  • NeoBundle 'chrisbra/vim-diff-enhanced'
• Vundle
  • Plugin 'chrisbra/vim-diff-enhanced'
• Vim-Plug
  • Plug 'chrisbra/vim-diff-enhanced'

2. Diff as usual

Using vimdiff, nvim -d or diffthis for example

3. Set the filter

:EnhancedDiffIgnorePat ^WARNING:.*

4. Re-diff

:diffupdate

Answer 2

Why don't you filter the files before invoking vimdiff?

grep -v "^WARNING" file1 > file1_w; 
grep -v "^WARNING" file2 > file2_w; 
vimdiff file1_w file2_w

If you're using Bash or zsh, you can do it with a single command:

vimdiff <(grep -v "^WARNING" file1) <(grep -v "^WARNING" file2)