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idea from [Ovid's journal](http://use.perl.org/use.perl.org/_Ovid/journal/37966.html) (ovid is full of really good ideas for vim):
to get a quick git diff in my vim session, put this in your .vimrc
``` viml
map ,gh :call SourceDiff() " gh for git history
function! SourceDiff()
let filename = bufname("%")
let command = 'git log -5 --pretty=format:"%h - (%ar) %an - %s" "'.filename.'"'
let result = split( system(command), "\n" )
if empty(result)
echomsg("No past revisions for " . filename)
return
endif
" get the list of files
let revision = PickFromList('revision', result)
if strlen(revision)
let items = split(revision, " ")
execute '!git diff ' . items[0] . ' -- "' . filename .'" | less'
endif
endfunction
```
the output looks like this:
```
Choose a revision:
1: ea0bb4d - (3 days ago) franck cuny - fix new_freq
2: a896ac7 - (5 weeks ago) franck cuny - fix typo
3: c9bc5fd - (5 weeks ago) franck cuny - update test
4: e9de4be - (5 weeks ago) franck cuny - change the way we rewrite and check an existing url
5: 3df1fd6 - (7 weeks ago) franck cuny - put id category
```
You choose the revision you want to check the diff against, and you got a (colorless) diff in your vim buffer.
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