feat(recipes): add diagnostic-virtual-lines-current-line recipe

Author: mehalter

lua/astrocommunity/recipes/diagnostic-virtual-lines-current-line/README.md

@@ -0,0 +1,5 @@
+# AstroCore - Automatically virtual lines on current line only
+
+**Website:** <https://docs.astronvim.com/recipes/diagnostics/#virtual-line-current-line-only>
+
+This plugin specification configures AstroCore to show virtual text except on the current line which shows as virtual lines.

lua/astrocommunity/recipes/diagnostic-virtual-lines-current-line/init.lua

@@ -0,0 +1,51 @@
+local og_virt_text
+local og_virt_line
+return {
+  "AstroNvim/astrocore",
+  ---@type AstroCoreOpts
+  opts = {
+    features = {
+      diagnostics = true,
+    },
+    diagnostics = {
+      virtual_text = true,
+      virtual_lines = { current_line = true },
+      underline = true,
+      update_in_insert = false,
+    },
+    autocmds = {
+      diagnostic_only_virtlines = {
+        {
+          event = { "CursorMoved", "DiagnosticChanged" },
+          callback = function()
+            if not require("astrocore.buffer").is_valid() then return end
+            if og_virt_line == nil then og_virt_line = vim.diagnostic.config().virtual_lines end
+
+            -- ignore if virtual_lines.current_line is disabled
+            if not (og_virt_line and og_virt_line.current_line) then
+              if og_virt_text then
+                vim.diagnostic.config { virtual_text = og_virt_text }
+                og_virt_text = nil
+              end
+              return
+            end
+
+            if og_virt_text == nil then og_virt_text = vim.diagnostic.config().virtual_text end
+
+            local lnum = vim.api.nvim_win_get_cursor(0)[1] - 1
+
+            if vim.tbl_isempty(vim.diagnostic.get(0, { lnum = lnum })) then
+              vim.diagnostic.config { virtual_text = og_virt_text }
+            else
+              vim.diagnostic.config { virtual_text = false }
+            end
+          end,
+        },
+        {
+          event = "ModeChanged",
+          callback = function() pcall(vim.diagnostic.show) end,
+        },
+      },
+    },
+  },
+}