From da3e3e4249eaabfe544934348f388023c06b4a4e Mon Sep 17 00:00:00 2001
From: Barrett Ruth <62671086+barrettruth@users.noreply.github.com>
Date: Wed, 4 Mar 2026 00:20:41 -0500
Subject: [PATCH] fix(compiler): check output exists before opening from
 long-running process (#24)

* fix(compiler): check output exists before opening from long-running process

Problem: for long-running processes (typst watch), M.compile() calls
the opener immediately after vim.system() returns, before the process
has produced any output. On first run the output file does not exist
yet, so the opener is called on a nonexistent path.

Solution: guard the open block with vim.uv.fs_stat so it only fires
if the output file already exists at spawn time.

* style(compiler): reformat long condition for stylua
---
 lua/preview/compiler.lua | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lua/preview/compiler.lua b/lua/preview/compiler.lua
index ee55604..8555881 100644
--- a/lua/preview/compiler.lua
+++ b/lua/preview/compiler.lua
@@ -147,7 +147,12 @@ function M.compile(bufnr, name, provider, ctx)
       end)
     )
 
-    if provider.open and not opened[bufnr] and output_file ~= '' then
+    if
+      provider.open
+      and not opened[bufnr]
+      and output_file ~= ''
+      and vim.uv.fs_stat(output_file)
+    then
       if provider.open == true then
         vim.ui.open(output_file)
       elseif type(provider.open) == 'table' then