6040c054cb
## Problem
Toggling large diffs via fugitive's `=` caused the top of the buffer to
re-render and glitch. `ensure_cache` always created a new cache entry
with
`pending_clear=true` and `highlighted={}`, forcing `on_win` to clear and
re-highlight every visible hunk — including stable ones above the toggle
point that never changed.
## Solution
On reparse, compare old and new hunk lists using a prefix + suffix
matching
strategy. Hunks that match (same filename, line count, and sampled
content)
carry forward their `highlighted` state so `on_win` skips them.
Comparison
is O(1) per hunk. Only runs when the old entry had
`pending_clear=false`;
`invalidate_cache`/`ColorScheme` paths still force full re-highlight.
Closes #131
304 lines
8.8 KiB
Lua
304 lines
8.8 KiB
Lua
require('spec.helpers')
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local diffs = require('diffs')
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describe('decoration_provider', function()
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local function create_buffer(lines)
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local bufnr = vim.api.nvim_create_buf(false, true)
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vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, lines or {})
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return bufnr
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end
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local function delete_buffer(bufnr)
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if vim.api.nvim_buf_is_valid(bufnr) then
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vim.api.nvim_buf_delete(bufnr, { force = true })
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end
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end
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describe('ensure_cache', function()
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it('populates hunk cache for a buffer with diff content', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,2 +1,3 @@',
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' local x = 1',
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'-local y = 2',
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'+local y = 3',
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' local z = 4',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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assert.is_not_nil(entry)
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assert.is_table(entry.hunks)
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assert.is_true(#entry.hunks > 0)
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delete_buffer(bufnr)
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end)
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it('cache tick matches buffer changedtick after attach', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,1 +1,2 @@',
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' local x = 1',
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'+local y = 2',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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local tick = vim.api.nvim_buf_get_changedtick(bufnr)
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assert.are.equal(tick, entry.tick)
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delete_buffer(bufnr)
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end)
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it('re-parses and advances tick when buffer content changes', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,1 +1,2 @@',
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' local x = 1',
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'+local y = 2',
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})
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diffs.attach(bufnr)
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local tick_before = diffs._test.hunk_cache[bufnr].tick
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vim.api.nvim_buf_set_lines(bufnr, -1, -1, false, { '+local z = 3' })
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diffs._test.ensure_cache(bufnr)
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local tick_after = diffs._test.hunk_cache[bufnr].tick
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assert.is_true(tick_after > tick_before)
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delete_buffer(bufnr)
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end)
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it('skips reparse when fingerprint unchanged but sets pending_clear', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,1 +1,2 @@',
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' local x = 1',
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'+local y = 2',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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local original_hunks = entry.hunks
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entry.pending_clear = false
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local lc = vim.api.nvim_buf_line_count(bufnr)
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local bc = vim.api.nvim_buf_get_offset(bufnr, lc)
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entry.line_count = lc
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entry.byte_count = bc
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entry.tick = -1
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diffs._test.ensure_cache(bufnr)
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local updated = diffs._test.hunk_cache[bufnr]
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local current_tick = vim.api.nvim_buf_get_changedtick(bufnr)
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assert.are.equal(original_hunks, updated.hunks)
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assert.are.equal(current_tick, updated.tick)
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assert.is_true(updated.pending_clear)
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delete_buffer(bufnr)
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end)
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it('does nothing for invalid buffer', function()
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local bufnr = create_buffer({})
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diffs.attach(bufnr)
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vim.api.nvim_buf_delete(bufnr, { force = true })
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assert.has_no.errors(function()
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diffs._test.ensure_cache(bufnr)
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end)
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end)
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end)
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describe('pending_clear', function()
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it('is true after invalidate_cache', function()
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local bufnr = create_buffer({})
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diffs.attach(bufnr)
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diffs._test.invalidate_cache(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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assert.is_true(entry.pending_clear)
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delete_buffer(bufnr)
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end)
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it('is true immediately after fresh ensure_cache', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,1 +1,2 @@',
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' local x = 1',
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'+local y = 2',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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assert.is_true(entry.pending_clear)
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delete_buffer(bufnr)
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end)
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end)
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describe('BufWipeout cleanup', function()
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it('removes hunk_cache entry after buffer wipeout', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,1 +1,2 @@',
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' local x = 1',
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'+local y = 2',
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})
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diffs.attach(bufnr)
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assert.is_not_nil(diffs._test.hunk_cache[bufnr])
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vim.api.nvim_buf_delete(bufnr, { force = true })
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assert.is_nil(diffs._test.hunk_cache[bufnr])
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end)
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end)
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describe('hunk stability', function()
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it('carries forward highlighted for stable hunks on section expansion', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,2 +1,2 @@',
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' local x = 1',
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'-local y = 2',
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'+local y = 3',
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'@@ -10,2 +10,3 @@',
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' function M.foo()',
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'+ return true',
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' end',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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assert.are.equal(2, #entry.hunks)
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entry.pending_clear = false
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entry.highlighted = { [1] = true, [2] = true }
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vim.api.nvim_buf_set_lines(bufnr, 5, 5, false, {
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'@@ -5,1 +5,2 @@',
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' local z = 4',
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'+local w = 5',
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})
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diffs._test.ensure_cache(bufnr)
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local updated = diffs._test.hunk_cache[bufnr]
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assert.are.equal(3, #updated.hunks)
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assert.is_true(updated.highlighted[1] == true)
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assert.is_nil(updated.highlighted[2])
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assert.is_true(updated.highlighted[3] == true)
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assert.is_false(updated.pending_clear)
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delete_buffer(bufnr)
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end)
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it('carries forward highlighted for stable hunks on section collapse', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,2 +1,2 @@',
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' local x = 1',
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'-local y = 2',
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'+local y = 3',
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'@@ -5,1 +5,2 @@',
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' local z = 4',
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'+local w = 5',
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'@@ -10,2 +10,3 @@',
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' function M.foo()',
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'+ return true',
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' end',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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assert.are.equal(3, #entry.hunks)
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entry.pending_clear = false
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entry.highlighted = { [1] = true, [2] = true, [3] = true }
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vim.api.nvim_buf_set_lines(bufnr, 5, 8, false, {})
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diffs._test.ensure_cache(bufnr)
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local updated = diffs._test.hunk_cache[bufnr]
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assert.are.equal(2, #updated.hunks)
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assert.is_true(updated.highlighted[1] == true)
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assert.is_true(updated.highlighted[2] == true)
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assert.is_false(updated.pending_clear)
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delete_buffer(bufnr)
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end)
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it('bypasses carry-forward when pending_clear was true', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,2 +1,2 @@',
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' local x = 1',
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'-local y = 2',
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'+local y = 3',
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'@@ -10,2 +10,3 @@',
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' function M.foo()',
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'+ return true',
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' end',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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entry.highlighted = { [1] = true, [2] = true }
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entry.pending_clear = true
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vim.api.nvim_buf_set_lines(bufnr, 5, 5, false, {
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'@@ -5,1 +5,2 @@',
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' local z = 4',
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'+local w = 5',
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})
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diffs._test.ensure_cache(bufnr)
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local updated = diffs._test.hunk_cache[bufnr]
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assert.are.same({}, updated.highlighted)
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assert.is_true(updated.pending_clear)
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delete_buffer(bufnr)
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end)
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it('does not carry forward when all hunks changed', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,2 +1,2 @@',
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' local x = 1',
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'-local y = 2',
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'+local y = 3',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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entry.pending_clear = false
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entry.highlighted = { [1] = true }
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vim.api.nvim_buf_set_lines(bufnr, 0, -1, false, {
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'M other.lua',
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'@@ -1,1 +1,2 @@',
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' local a = 1',
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'+local b = 2',
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})
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diffs._test.ensure_cache(bufnr)
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local updated = diffs._test.hunk_cache[bufnr]
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assert.is_nil(updated.highlighted[1])
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assert.is_false(updated.pending_clear)
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delete_buffer(bufnr)
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end)
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end)
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describe('multiple hunks in cache', function()
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it('stores all parsed hunks for a multi-hunk buffer', function()
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local bufnr = create_buffer({
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'M test.lua',
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'@@ -1,2 +1,2 @@',
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' local x = 1',
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'-local y = 2',
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'+local y = 3',
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'@@ -10,2 +10,3 @@',
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' function M.foo()',
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'+ return true',
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' end',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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assert.is_not_nil(entry)
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assert.are.equal(2, #entry.hunks)
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delete_buffer(bufnr)
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end)
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it('stores empty hunks table for buffer with no diff content', function()
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local bufnr = create_buffer({
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'Head: main',
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'Help: g?',
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'',
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'Nothing to see here',
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})
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diffs.attach(bufnr)
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local entry = diffs._test.hunk_cache[bufnr]
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assert.is_not_nil(entry)
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assert.are.same({}, entry.hunks)
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delete_buffer(bufnr)
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end)
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end)
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end)
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