From 8e5ebac114003b06fa6d221d9ed3d79e002b404f Mon Sep 17 00:00:00 2001
From: Dennis Eriksen <d@ennis.no>
Date: Fri, 5 Jul 2024 14:29:56 +0200
Subject: Hide signcolumn if there are no signs to show

---
 config/.config/nvim/lua/config/options.lua | 14 ++++++++++++++
 config/.config/nvim/lua/plugins/_ui.lua    |  3 ---
 config/.config/nvim/lua/utils/init.lua     | 29 +++++++++++++++++++++++++++++
 3 files changed, 43 insertions(+), 3 deletions(-)

diff --git a/config/.config/nvim/lua/config/options.lua b/config/.config/nvim/lua/config/options.lua
index 4080d92..4eaa25a 100644
--- a/config/.config/nvim/lua/config/options.lua
+++ b/config/.config/nvim/lua/config/options.lua
@@ -229,6 +229,20 @@ vim.g.loaded_python3_provider = 0
 -- Turn off autoformatting in LazyVim
 vim.g.autoformat = false
 
+-- Show deprecation warnings
+vim.g.deprecation_warnings = true
+
+-- Statuscolumn
+vim.opt.statuscolumn = [[%!v:lua.require'utils'.statuscolumn()]]
+
+-- Signcolumn
+vim.opt.signcolumn = "auto"
+-- utils.statuscolumn() uses vim.g.signcolumn to determine if we should show
+-- signcolumn, and it will reset vim.opt.signcolumn. This is because
+-- utils.statuscolumn() calls lazyvim.util.ui.statuscolumn(), which uses
+-- vim.opt.signcolumn.
+vim.g.signcolumn = "auto"
+
 ---------------------------------------------------------------------------------
 --
 -- Moving around, tabs, windows, and buffers
diff --git a/config/.config/nvim/lua/plugins/_ui.lua b/config/.config/nvim/lua/plugins/_ui.lua
index 2e4326d..924e4d8 100644
--- a/config/.config/nvim/lua/plugins/_ui.lua
+++ b/config/.config/nvim/lua/plugins/_ui.lua
@@ -24,9 +24,6 @@ return {
   --  "akinsho/bufferline.nvim",
   --},
 
-  -- TODO: Add plugin for statuscolumn
-  -- I want a thinner statuscolumn when there are no gitsigns or debug-stuff shown.
-
   { -- https://github.com/nvim-lualine/lualine.nvim
     "nvim-lualine/lualine.nvim",
     opts = {
diff --git a/config/.config/nvim/lua/utils/init.lua b/config/.config/nvim/lua/utils/init.lua
index 6aa0a91..2ea5316 100644
--- a/config/.config/nvim/lua/utils/init.lua
+++ b/config/.config/nvim/lua/utils/init.lua
@@ -15,4 +15,33 @@ M.lazy = {
   end,
 }
 
+function M.statuscolumn()
+  -- lazyvim.util.ui.statuscolumn uses vim.wo[win].signcolumn to determine if it should show signcolumn
+  --
+
+  local win = vim.g.statusline_winid
+  local buf = vim.api.nvim_win_get_buf(win)
+  local next = next -- https://stackoverflow.com/a/1252776
+  local signcolumn = vim.g.signcolumn
+
+  -- If there are no signs to show, nvim_buf_get_extmarks() will return {}
+  -- also, <nvim-0.10 might not show *all* signs, so always show signcolumn if <nvim-0.10
+  local extmarks = vim.fn.has("nvim-0.10") and vim.api.nvim_buf_get_extmarks(
+    buf, -- bufnr
+    -1,  -- namespace id
+    0,   -- start(line)
+    -1,  -- end(line)
+    { details = true, type = "sign" } -- options
+  ) or {true}
+
+  -- if signcolumn == yes or signcolumn = auto, and extmarks is *not* empty
+  if signcolumn == "yes" or (signcolumn == "auto" and next(extmarks) ~= nil) then
+    vim.wo[win].signcolumn = "yes"
+  else
+    vim.wo[win].signcolumn = "no"
+  end
+
+  return require('lazyvim.util').ui.statuscolumn()
+end
+
 return M
-- 
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