Create patch for currently editing file
From Vim Tips Wiki
created June 18, 2007 · complexity basic · author Christian Brabandt · version 6.0
Sometimes one wants to create a unified patch from the file which is currently being edited. I have written a function that will create the patch and open it in a new buffer, so that it could possibly be further edited. In case the function cannot determine the unchanged reference file, it will ask the user to provide an alternative filename for diffing (by default it tries to open a file named like the current file with the suffix ".orig" appended.
It will create temporary files in case the current buffer is not modified or new. At the end it will delete the temporary files (but this works only on Linux).
For Windows this script relies on the command diff which must be in your path in order to be executed successfully. The diff command can be modified in the first line of the function.
fu! DiffUnified() let diffexpr="diff -Nuar" let bname=bufname("") let origtemp=0 " Case 1: File has a filename and is not modified if !&modified && !empty(bname) let tempfile=0 let origFile=bname.".orig" else " Case 2: File has a filename and is modified if &modified && !empty(bname) if !filereadable(bname.".orig") sp enew r # 0d let tempfile2=tempname() exe ":sil w! " .tempfile2 wincmd q let origtemp=1 wincmd p endif let origFile=tempfile2 " Case 2: File is new and is modified else if &modified let origFile=bname.".orig" else let origFile="" endif endif let bname=tempname() exe ":sil w! ".bname let tempfile=1 endif try if !filereadable(origFile) let origFile=input("With which file to diff?: ","","file") endif if !filereadable(bname) exe ":sil w! ".bname endif if empty(origFile) throw "nofile" endif exe "sil sp" exe "enew" set bt=nofile exe "sil r!".diffexpr." ".origFile." ".bname exe "0d_" exe "set ft=diff" " Clean up temporary files if tempfile == 1 exe "sil :!rm -f ". bname let tempfile=0 endif if origtemp == 1 exe "sil :!rm -f ". origFile let origtemp=0 endif catch endtry endf
 See also
(these tips may be related...verify after this tip is cleaned up)
- Need better explanation of purpose of tip, and how to use it.
- Should better comment the script.
- Should rename to improve the title.