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fix: fall back to /tmp for buffers without a backing file (#60)

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* fix: fall back to /tmp for buffers without a backing file

Problem: markdown and gfm presets fail when the buffer has no file on
disk (e.g. unnamed buffer with `ft=markdown`, or a named buffer whose
path doesn't exist yet) because `build_context` passes a nonexistent
path to pandoc and `compile` guards reject empty buffer names.

Solution: `build_context` now detects missing files and redirects
`ctx.file` to `/tmp/{bufnr}-{name}`. `compile` writes buffer contents
to that temp path via `vim.fn.writefile` instead of `:silent! update`.

* test: update unnamed buffer tests for tmpfile fallback

Problem: the unnamed buffer guard tests expected a "no file name"
warning that no longer exists after the tmpfile fallback change.

Solution: update assertions to expect the downstream messages that
unnamed buffers now reach ("no provider configured", "no output file").
This commit is contained in:
Barrett Ruth 2026-03-13 08:22:45 -04:00 • committed by GitHub
parent 272153a158
commit f185ae78f7
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3 changed files with 48 additions and 32 deletions
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24
spec/init_spec.lua
View file

@ -126,43 +126,43 @@ describe('preview', function()
return msg
end
it('compile warns on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'typst')
it('compile falls through to provider check on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'lua')
local msg = capture_notify(function()
preview.compile(bufnr)
end)
assert.is_not_nil(msg)
assert.is_truthy(msg:find('no file name'))
assert.is_truthy(msg:find('no provider configured'))
helpers.delete_buffer(bufnr)
end)
it('toggle warns on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'typst')
it('toggle falls through to provider check on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'lua')
local msg = capture_notify(function()
preview.toggle(bufnr)
end)
assert.is_not_nil(msg)
assert.is_truthy(msg:find('no file name'))
assert.is_truthy(msg:find('no provider configured'))
helpers.delete_buffer(bufnr)
end)
it('clean warns on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'typst')
it('clean falls through to provider check on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'lua')
local msg = capture_notify(function()
preview.clean(bufnr)
end)
assert.is_not_nil(msg)
assert.is_truthy(msg:find('no file name'))
assert.is_truthy(msg:find('no provider configured'))
helpers.delete_buffer(bufnr)
end)
it('open warns on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'typst')
it('open warns no output on unnamed buffer', function()
local bufnr = helpers.create_buffer({}, 'lua')
local msg = capture_notify(function()
preview.open(bufnr)
end)
assert.is_not_nil(msg)
assert.is_truthy(msg:find('no file name'))
assert.is_truthy(msg:find('no output file'))
helpers.delete_buffer(bufnr)
end)
end)