barrett/preview.nvim
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fix: fall back to /tmp for buffers without a backing file

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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`.
This commit is contained in:
Barrett Ruth 2026-03-13 08:19:57 -04:00
parent 272153a158
commit c1734eec8f
Signed by: barrett
GPG key ID: A6C96C9349D2FC81
2 changed files with 36 additions and 20 deletions
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46
lua/preview/init.lua
View file

@ -139,27 +139,49 @@ function M.resolve_provider(bufnr)
return ft
end
local ft_ext = {
markdown = 'md',
typst = 'typ',
tex = 'tex',
asciidoc = 'adoc',
plantuml = 'puml',
mermaid = 'mmd',
quarto = 'qmd',
}
---@param bufnr? integer
---@return preview.Context
function M.build_context(bufnr)
bufnr = bufnr or vim.api.nvim_get_current_buf()
local file = vim.api.nvim_buf_get_name(bufnr)
local root = vim.fs.root(bufnr, { '.git' }) or vim.fn.fnamemodify(file, ':h')
local ft = vim.bo[bufnr].filetype
local root
if file ~= '' and vim.uv.fs_stat(file) then
root = vim.fs.root(bufnr, { '.git' }) or vim.fn.fnamemodify(file, ':h')
else
local basename
if file ~= '' then
basename = string.format('%d-%s', bufnr, vim.fn.fnamemodify(file, ':t'))
else
local ext = ft_ext[ft] or ft
basename = string.format('preview-%d.%s', bufnr, ext)
end
file = '/tmp/' .. basename
root = '/tmp'
end
return {
bufnr = bufnr,
file = file,
root = root,
ft = vim.bo[bufnr].filetype,
ft = ft,
}
end
---@param bufnr? integer
function M.compile(bufnr)
bufnr = bufnr or vim.api.nvim_get_current_buf()
if vim.api.nvim_buf_get_name(bufnr) == '' then
vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
return
end
local name = M.resolve_provider(bufnr)
if not name then
vim.notify('[preview.nvim]: no provider configured for this filetype', vim.log.levels.WARN)
@ -179,10 +201,6 @@ end
---@param bufnr? integer
function M.clean(bufnr)
bufnr = bufnr or vim.api.nvim_get_current_buf()
if vim.api.nvim_buf_get_name(bufnr) == '' then
vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
return
end
local name = M.resolve_provider(bufnr)
if not name then
vim.notify('[preview.nvim]: no provider configured for this filetype', vim.log.levels.WARN)
@ -196,10 +214,6 @@ end
---@param bufnr? integer
function M.toggle(bufnr)
bufnr = bufnr or vim.api.nvim_get_current_buf()
if vim.api.nvim_buf_get_name(bufnr) == '' then
vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
return
end
local name = M.resolve_provider(bufnr)
if not name then
vim.notify('[preview.nvim]: no provider configured for this filetype', vim.log.levels.WARN)
@ -212,10 +226,6 @@ end
---@param bufnr? integer
function M.open(bufnr)
bufnr = bufnr or vim.api.nvim_get_current_buf()
if vim.api.nvim_buf_get_name(bufnr) == '' then
vim.notify('[preview.nvim]: buffer has no file name', vim.log.levels.WARN)
return
end
local name = M.resolve_provider(bufnr)
local open_config = name and config.providers[name] and config.providers[name].open
if not compiler.open(bufnr, open_config) then