From 8e77a808fa110489f32729b97400f7f36a5039d7 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Thu, 8 Mar 2018 03:15:40 -0500
Subject: initial implementation

---
 plugin/diff-changes.vim | 75 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 plugin/diff-changes.vim

(limited to 'plugin')

diff --git a/plugin/diff-changes.vim b/plugin/diff-changes.vim
new file mode 100644
index 0000000..acd2cbd
--- /dev/null
+++ b/plugin/diff-changes.vim
@@ -0,0 +1,75 @@
+if exists('g:loaded_diff_changes') || &cp
+  finish
+endif
+let g:loaded_diff_changes = 1
+
+let s:foldmethod = &foldmethod
+let s:foldenable = &foldenable
+let s:diffwindow = 0
+
+function! s:diffstart(read_cmd)
+    if s:diffwindow != 0
+        return
+    endif
+    let s:foldmethod = &foldmethod
+    let s:foldenable = &foldenable
+    let l:filetype = &filetype
+    vert new
+    let s:diffwindow = winnr()
+    set buftype=nofile
+    try
+        exe a:read_cmd
+    catch /.*/
+        echohl ErrorMsg
+        echo v:exception
+        echohl NONE
+        call s:diffstop()
+        return
+    endtry
+    let &filetype = l:filetype
+    diffthis
+    wincmd p
+    diffthis
+endfunction
+
+function! s:diffstop()
+    if s:diffwindow == 0
+        return
+    endif
+    diffoff!
+    exe s:diffwindow . 'wincmd w'
+    bdelete
+    let &foldmethod = s:foldmethod
+    let &foldenable = s:foldenable
+    if &foldenable
+        if &foldmethod == 'marker'
+            normal! zv
+        else
+            normal! zE
+        end
+    endif
+    let s:diffwindow = 0
+endfunction
+
+function! s:vcs_orig(file)
+    " XXX: would be nice to use a:file rather than # here...
+    let l:dir = expand('#:p:h')
+    if filewritable(l:dir . '/.svn') == 2
+        return system('svn cat ' . a:file)
+    elseif filewritable(l:dir . '/CVS') == 2
+        return system("AFILE=" . a:file . "; MODFILE=`tempfile`; DIFF=`tempfile`; cp $AFILE $MODFILE && cvs diff -u $AFILE > $DIFF; patch -R $MODFILE $DIFF 2>&1 > /dev/null && cat $MODFILE; rm $MODFILE $DIFF")
+    elseif finddir('_darcs', l:dir . ';') =~# '_darcs'
+        return system('darcs show contents ' . a:file)
+    elseif finddir('.git', l:dir . ';') =~# '.git'
+        let l:prefix = system('git rev-parse --show-prefix')
+        let l:prefix = substitute(l:prefix, '\n', '', 'g')
+        let l:cmd = 'git show HEAD:'.l:prefix.a:file
+        return system(l:cmd)
+    else
+        throw 'No VCS directory found'
+    endif
+endfunction
+
+command DiffAgainstFilesystem call <SID>diffstart('read # | normal! ggdd')
+command DiffAgainstVCS call <SID>diffstart('call append(0, split(s:vcs_orig(expand("#:.")), "\n", 1)) | normal! Gdddd')
+command DiffStop call <SID>diffstop()
-- 
cgit v1.2.3-54-g00ecf