v0.6.1
vim (not Nvim) does not have vim.diff
Linux etak 5.16.2-arch1-1 #1 SMP PREEMPT Thu, 20 Jan 2022 16:18:29 +0000 x86_64 GNU/Linux
# GNOME Terminal 3.42.2 using VTE 0.66.2 +BIDI +GNUTLS +ICU +SYSTEMD
xterm-256color
pacman -S neovim
According to :h vim.diff, the optional argument algorithm enables switching between different supported diffing algorithms. So I've decided to experiment it with the following two files found there../file
public class File1 {
public int sub (int a, int b)
{
// TOOD: JIRA1234
if ( isNull(a, b) )
{
return null
}
log();
return a - b;
}
public int mul (int a, int b)
{
if ( isNull(a, b) )
{
return null;
}
log();
return a * b;
}
}
./other
public class File1 {
public int add (int a, int b)
{
log();
return a + b;
}
public int sub (int a, int b)
{
if (a == b)
{
return 0;
}
log();
return a - b;
// TOOD: JIRA1234
}
}
I can check that the default myers and patience algorithm produce different results with the following:
$ nvim --clean -d ./file ./other # admire diff
:set diffopt+=algorithm:patience " admire change
But I could not reproduce the difference with vim.diff. For instance, with the following file added:./test_diff.vim
lua <<EOF
function TestVimDiff(algo)
io.input(io.open("file", "r"))
local a = io.read("*a")
io.close()
io.input(io.open("other", "r"))
local b = io.read("*a")
io.close()
print(vim.diff(a, b, {algorithm=algo}))
end
EOF
The following experiment yielded unsatisfactory results:
$ nvim --clean
:source test_diff.vim
:lua TestVimDiff("myers") " ok: the myers diff is printed.
:lua TestVimDiff("patience") " not ok: the myers diff is printed again.
Why? Have I missed anything about the way vim.diff should be invoked? Or is this a bug?
vim.diff(a, b, {algorithm = "myers"}) and vim.diff(a, b, {algorithm = "patience"}) should produce different results on relevant files.
vim.diff(a, b, {algorithm = "myers"}) and vim.diff(a, b, {algorithm = "patience"}) produce the same results even on relevant files.
(btw I'm noticing that grep algorithm over test/functional/lua/xdiff_spec.lua yields no match. Is this the relevant test file? If yes, maybe the above two example files can be useful as algorithm tests?)
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