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fix: stream stderr for long-running providers, clear errors on success

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Problem: Long-running providers (e.g. `typst watch`) never exit on
compile error, so the exit callback never fired and diagnostics/quickfix
were never populated. The `typst watch` `reload` command also lacked
`--diagnostic-format short`, producing unparseable verbose output.

Solution: Add a `stderr` streaming callback to the long-running
`vim.system` call that accumulates chunks and re-parses on each new
chunk, populating diagnostics or quickfix in real time. When the
fs_event fires (successful compile), clear `stderr_acc` and the
reported errors. Add `--diagnostic-format short` to the typst `reload`
command to match the one-shot `args` format.
This commit is contained in:
Barrett Ruth 2026-03-04 16:33:02 -05:00
parent 239f8a4769
commit 2edeef478d
Signed by: barrett
GPG key ID: A6C96C9349D2FC81
2 changed files with 44 additions and 1 deletions
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43
lua/preview/compiler.lua
View file

@ -143,12 +143,45 @@ function M.compile(bufnr, name, provider, ctx, opts)
table.concat(reload_cmd, ' ')
)
local stderr_acc = {}
local obj
obj = vim.system(
reload_cmd,
{
cwd = cwd,
env = provider.env,
stderr = vim.schedule_wrap(function(err, data)
if not data or not vim.api.nvim_buf_is_valid(bufnr) then
return
end
stderr_acc[#stderr_acc + 1] = data
local errors_mode = provider.errors
if errors_mode == nil then
errors_mode = 'diagnostic'
end
if provider.error_parser and errors_mode then
local output = table.concat(stderr_acc)
if errors_mode == 'diagnostic' then
diagnostic.set(bufnr, name, provider.error_parser, output, ctx)
elseif errors_mode == 'quickfix' then
local ok, diags = pcall(provider.error_parser, output, ctx)
if ok and diags and #diags > 0 then
local items = {}
for _, d in ipairs(diags) do
table.insert(items, {
bufnr = bufnr,
lnum = d.lnum + 1,
col = d.col + 1,
text = d.message,
type = d.severity == vim.diagnostic.severity.WARN and 'W' or 'E',
})
end
vim.fn.setqflist(items, 'r')
vim.cmd('copen')
end
end
end
end),
},
vim.schedule_wrap(function(result)
if active[bufnr] and active[bufnr].obj == obj then
@ -228,6 +261,16 @@ function M.compile(bufnr, name, provider, ctx, opts)
return
end
stop_open_watcher(bufnr)
stderr_acc = {}
local errors_mode = provider.errors
if errors_mode == nil then
errors_mode = 'diagnostic'
end
if errors_mode == 'diagnostic' then
diagnostic.clear(bufnr)
elseif errors_mode == 'quickfix' then
vim.fn.setqflist({}, 'r')
end
do_open(bufnr, output_file, provider.open)
opened[bufnr] = true
end)

2
lua/preview/presets.lua
View file

@ -133,7 +133,7 @@ M.typst = {
end,
open = true,
reload = function(ctx)
return { 'typst', 'watch', ctx.file }
return { 'typst', 'watch', '--diagnostic-format', 'short', ctx.file }
end,
}