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fix(api): auto-load buffers in nvim_buf_set_* operations (#35046)

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fix(api): auto-load buffers in nvim_buf_set_* operations

Problem: Setting marks, lines, or text on unloaded buffers fails because
ml_line_count is not accurate until the buffer is loaded.

Solution: Add require_loaded_buffer() helper and use it in write operations
(nvim_buf_set_lines, nvim_buf_set_text, nvim_buf_set_mark). These now
auto-load buffers as needed.
This commit is contained in:
glepnir
2026-01-21 14:17:44 +08:00
committed by GitHub
parent 2c2203c040
commit c556972ae1
2 changed files with 35 additions and 15 deletions
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16
test/functional/api/buffer_spec.lua
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@@ -863,6 +863,7 @@ describe('api/buf', function()
local new_bufnr = fn.bufnr('set_lines', true)
lua_or_rpc.nvim_buf_set_lines(new_bufnr, 0, -1, false, {})
eq({ '' }, lua_or_rpc.nvim_buf_get_lines(new_bufnr, 0, -1, false))
eq(true, api.nvim_buf_is_loaded(new_bufnr))
end)
end)
@@ -1809,6 +1810,14 @@ describe('api/buf', function()
eq({ 'one', 'two' }, get_lines(0, 2, true))
end)
it('auto-loads unloaded buffer', function()
local new_bufnr = fn.bufnr('set_text', true)
eq(false, api.nvim_buf_is_loaded(new_bufnr))
api.nvim_buf_set_text(new_bufnr, 0, 0, 0, -1, { 'foo' })
eq(true, api.nvim_buf_is_loaded(new_bufnr))
eq({ 'foo' }, api.nvim_buf_get_lines(new_bufnr, 0, -1, false))
end)
describe('handles topline', function()
local screen
before_each(function()
@@ -2375,6 +2384,13 @@ describe('api/buf', function()
it('fails when invalid buffer number is used', function()
eq(false, pcall(api.nvim_buf_set_mark, 99, 'a', 1, 1, {}))
end)
it('auto-loads unloaded buffer', function()
local new_bufnr = fn.bufnr('set_mark', true)
eq(false, api.nvim_buf_is_loaded(new_bufnr))
eq(true, api.nvim_buf_set_mark(new_bufnr, 'A', 0, 0, {}))
eq(true, api.nvim_buf_is_loaded(new_bufnr))
eq({ 0, 0 }, api.nvim_buf_get_mark(new_bufnr, 'A'))
end)
end)
describe('nvim_buf_del_mark', function()