Scenario: I have opened Vim and pasted some text. I open a second tab with :tabe and paste some other text in there.
Goal: I would like a third tab with a output equivalent to writing both texts to files and opening them with vimdiff.
The closest I can find is "diff the current buffer against a file", but not diffing two open but unsaved buffers.
I suggest opening the second file in the same tab instead of a new one.
Here's what I usually do:
:edit file1
:diffthis
:vnew
:edit file2
:diffthis
The :vnew command splits the current view vertically so you can open the second file there. The :diffthis (or short: :difft) command is then applied to each view.
I would suggest trying :diffthis or :diffsplit
:vert diffsplit makes for a more traditional diff-view than without :vert
:set scrollbind in both.
:diffsplit I get two connected buffers.
When you have two files opened in vertical splitt, run
:windo diffthis
:diffoff to turn off diff mode
The content of all tabs are inside the buffers. Look at the buffers:
:buffers
Find the right number for the content which should be diffed with your current tab content.
Open the buffer inside your current tab (f.e. buffer number 4)
:sb 4
Or do for vertical view:
:vertical sb 4
Then you can simple diff the content with
:windo diffthis
If you finished diff analysis you can input:
:windo diffoff
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vimdiff file1.txt file2.txtand knock yourself out.edit fileNparts can be replaced with just pasting from the buffer, which lets you diff two chunks of text without pasting each into a tmp file (something that meld lets you do, but visual diff tools on the Mac are lacking in). It worked in MacVim for me out of the box.