Add BufDiff()

1 files changed, 47 insertions, 0 deletions

diff --git a/vimrc b/vimrc
index 959b9e1..54a49d7 100644
--- a/vimrc
+++ b/vimrc
@@ -283,4 +283,51 @@ function! <SID>InsertDOW() " {{{2
 	" Return the value in the x register
 	let @x = tmpx
 endfunction
+" }}}
+" BufDiff, by zlg {{{2
+" Function: BufDiff
+" Author: zlg <zlg+viml@zlg.space>
+" Date: 2018-10-12
+" License: GNU GPL, version 3 <https://gnu.org/licenses/gpl-3.0.html>
+" Description: Open a new tab page with two or three buffers and enter diff mode.
+" Long Description:
+" BufDiff accepts two or three buffer arguments and opens a new tab page to
+" work with them in diff mode. This ensures that your existing window and
+" buffer layout is preserved while providing an easy way to enter a diff
+" session. The arguments can be any argument that can also be passed to
+" the ":buffer" Ex-command, including partial filenames (if quoted).
+function! BufDiff(buf1, buf2, ...)
+	let fname = substitute(expand("<sfile>"), "^function ", "", "")
+	if a:0 > 1
+		echohl ErrorMsg
+		echomsg l:fname . ": This function accepts a maximum of three arguments."
+		echohl None
+		return
+	endif
+
+	" Check for a third buffer, which will default to zero if not present
+	let a:buf3 = get(a:, 1, 0)
+
+	if !bufexists(a:buf1) || !bufexists(a:buf2) || (a:0 == 1 && !bufexists(a:buf3))
+		echohl ErrorMsg
+		echomsg l:fname . ": One or more buffer number(s) not found!"
+		echohl None
+		return
+	else
+		tabnew
+		exe ":buffer " . a:buf1
+		diffthis
+		vsplit
+		exe ":buffer " . a:buf2
+		diffthis
+		if a:buf3
+			vsplit
+			exe ":buffer " . a:buf3
+			diffthis
+		endif
+		return
+	endif
+endfunction
+" }}}
+
 " vim: foldmethod=marker