From 96a83236f4ddb61731e6e794c96f651ac6d22ba9 Mon Sep 17 00:00:00 2001
From: LordMZTE <lord@mzte.de>
Date: Tue, 19 Nov 2024 08:24:29 +0100
Subject: [PATCH] mzte-nv: TypstWatch: use fs events instead of timer to open
 viewer

---
 mzte-nv/conf/ftplugin/typst.fnl | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/mzte-nv/conf/ftplugin/typst.fnl b/mzte-nv/conf/ftplugin/typst.fnl
index be6cff0..380699b 100644
--- a/mzte-nv/conf/ftplugin/typst.fnl
+++ b/mzte-nv/conf/ftplugin/typst.fnl
@@ -6,8 +6,8 @@
            (let [Terminal (. (require :toggleterm.terminal) :Terminal)
                  lspc-util (require :lspconfig.util)
                  file (vim.api.nvim_buf_get_name 0)
-                 outfile (.. :/tmp/
-                             (string.gsub (vim.fs.basename file) "%.typ$" :.pdf))
+                 outfile-base (string.gsub (vim.fs.basename file) "%.typ$" :.pdf)
+                 outfile (.. :/tmp/ outfile-base)
                  root ((lspc-util.root_pattern :.typstroot) file)
                  term (Terminal:new {:direction :horizontal
                                      :cmd (if root
@@ -15,13 +15,14 @@
                                                   " " file " " outfile)
                                               (.. "typst watch " file " "
                                                   outfile))})
-                 viewer-timer (vim.uv.new_timer)]
-             (term:open)
-             (viewer-timer:start 2000 0
-                                 (fn []
-                                   (viewer-timer:stop)
-                                   (viewer-timer:close)
-                                   (vim.uv.spawn :zathura {:args [outfile]}
-                                                 (fn [code signal]
-                                                   (vim.schedule #(term:shutdown))))))))]
+                 fsev (vim.uv.new_fs_event)
+                 on-file-appear (fn [err file events]
+                                  (when (and (not err) (= file outfile-base))
+                                    (print :open)
+                                    (fsev:stop)
+                                    (vim.uv.spawn :zathura {:args [outfile]}
+                                                  (fn [code signal]
+                                                    (vim.schedule #(term:shutdown))))))]
+             (fsev:start :/tmp {} on-file-appear)
+             (term:open)))]
   (vim.api.nvim_create_user_command :TypstWatch cb {:nargs 0}))