1 files changed, 42 insertions, 0 deletions
diff --git a/runtime/lua/vim/deprecated/health.lua b/runtime/lua/vim/deprecated/health.lua
new file mode 100644
index 0000000000..0f6b1f578c
--- /dev/null
+++ b/runtime/lua/vim/deprecated/health.lua
@@ -0,0 +1,42 @@
+local M = {}
+local health = vim.health
+
+local deprecated = {}
+
+function M.check()
+  if next(deprecated) == nil then
+    health.ok('No deprecated functions detected')
+    return
+  end
+
+  for name, v in vim.spairs(deprecated) do
+    health.start('')
+
+    local version, backtraces, alternative = v[1], v[2], v[3]
+    local major, minor = version:match('(%d+)%.(%d+)')
+    major, minor = tonumber(major), tonumber(minor)
+    local removal_version = string.format('nvim-%d.%d', major, minor)
+    local will_be_removed = vim.fn.has(removal_version) == 1 and 'was removed' or 'will be removed'
+
+    local msg = ('%s is deprecated. Feature %s in Nvim %s'):format(name, will_be_removed, version)
+    local msg_alternative = alternative and ('use %s instead.'):format(alternative)
+    local advice = { msg_alternative }
+    table.insert(advice, backtraces)
+    advice = vim.iter(advice):flatten():totable()
+    health.warn(msg, advice)
+  end
+end
+
+function M.add(name, version, backtrace, alternative)
+  if deprecated[name] == nil then
+    deprecated[name] = { version, { backtrace }, alternative }
+    return
+  end
+
+  local it = vim.iter(deprecated[name][2])
+  if it:find(backtrace) == nil then
+    table.insert(deprecated[name][2], backtrace)
+  end
+end
+
+return M