From cd8bf02c387bc0b2a0142bd368dea1e586a51949 Mon Sep 17 00:00:00 2001
From: Thomas Schmucker <ts@its1.de>
Date: Fri, 6 Mar 2026 12:37:08 +0100
Subject: neovim: reine Lua funktion

---
 nvim/lua/plugins/ui.lua | 56 +++++++++++++++++++++++--------------------------
 1 file changed, 26 insertions(+), 30 deletions(-)

diff --git a/nvim/lua/plugins/ui.lua b/nvim/lua/plugins/ui.lua
index 22c0c3a..70140d8 100644
--- a/nvim/lua/plugins/ui.lua
+++ b/nvim/lua/plugins/ui.lua
@@ -63,43 +63,39 @@ return {
   {
     "mattn/calendar-vim",
     config = function()
-      vim.cmd([[
-      function! CalendarInsertDate(day, month, year, week, dir)
-      let date = printf("%04d-%02d-%02d", a:year, a:month, a:day)
+      function _G.CalendarInsertDate(day, month, year)
+        local date = string.format("%04d-%02d-%02d", year, month, day)
 
-      " Kalenderfenster schließen und zum vorherigen Fenster zurück
-      wincmd q
-      wincmd p
+        vim.cmd("wincmd q")
+        vim.cmd("wincmd p")
 
-      let pattern = '\v\d{4}-\d{2}-\d{2}'
-      let line = getline('.')
-      let col = col('.')
+        local line = vim.api.nvim_get_current_line()
+        local col = vim.api.nvim_win_get_cursor(0)[2] + 1
 
-      " Prüfen ob Cursor innerhalb eines Datums steht
-      let start = match(line, pattern)
+        local start = 1
+        while true do
+          local s, e = string.find(line, "%d%d%d%d%-%d%d%-%d%d", start)
+          if not s then break end
 
-      while start >= 0
-      let end = start + strlen(matchstr(line[start:], pattern))
-      if col >= start + 1 && col <= end
-      " Datum ersetzen
-      call setline('.', line[:start-1] . date . line[end:])
-      call cursor('.', start + strlen(date))
-      return
-      endif
-      let start = match(line, pattern, end)
-      endwhile
+          if col >= s and col <= e then
+            local new = line:sub(1, s - 1) .. date .. line:sub(e + 1)
+            vim.api.nvim_set_current_line(new)
+            vim.api.nvim_win_set_cursor(0, { vim.fn.line("."), s + #date - 1 })
+            return
+          end
 
-      " Kein Datum unter Cursor → wie bisher einfügen
-      execute "normal! a" . date
-      endfunction
+          start = e + 1
+        end
 
-      let calendar_action = 'CalendarInsertDate'
+        vim.api.nvim_put({ date }, "c", true, true)
+      end
 
-      let g:calendar_monday = 1
-      let g:calendar_wruler = 'So Mo Di Mi Do Fr Sa'
-      let g:calendar_mruler = 'Jan,Feb,Mär,Apr,Mai,Jun,Jul,Aug,Sep,Okt,Nov,Dez'
-      let g:calendar_weeknm = 4
-      ]])
+      vim.g.calendar_action = "v:lua.CalendarInsertDate"
+
+      vim.g.calendar_monday = 1
+      vim.g.calendar_wruler = "So Mo Di Mi Do Fr Sa"
+      vim.g.calendar_mruler = "Jan,Feb,Mär,Apr,Mai,Jun,Jul,Aug,Sep,Okt,Nov,Dez"
+      vim.g.calendar_weeknm = 4
     end,
   },
 }
-- 
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