refactor(options): require `enable_if = false` iff no variable (#28050)

This makes grepping for unsupported options easier.

1 files changed, 7 insertions, 2 deletions

diff --git a/src/nvim/generators/gen_options.lua b/src/nvim/generators/gen_options.lua
index c0c0d6e0b4..0718d965c6 100644
--- a/src/nvim/generators/gen_options.lua
+++ b/src/nvim/generators/gen_options.lua
@@ -165,17 +165,22 @@ local function dump_option(i, o)
     w(get_cond(o.enable_if))
   end
 
-  -- Options cannot be both hidden and immutable.
+  -- An option cannot be both hidden and immutable.
   assert(not o.hidden or not o.immutable)
 
+  local has_var = true
   if o.varname then
     w('    .var=&' .. o.varname)
-  -- Hidden and immutable options can directly point to the default value.
   elseif o.hidden or o.immutable then
+    -- Hidden and immutable options can directly point to the default value.
     w(('    .var=&options[%u].def_val'):format(i - 1))
   elseif #o.scope == 1 and o.scope[1] == 'window' then
     w('    .var=VAR_WIN')
+  else
+    has_var = false
   end
+  -- `enable_if = false` should be present iff there is no variable.
+  assert((o.enable_if == false) == not has_var)
   w('    .hidden=' .. (o.hidden and 'true' or 'false'))
   w('    .immutable=' .. (o.immutable and 'true' or 'false'))
   if #o.scope == 1 and o.scope[1] == 'global' then