eval: Move VimL functions list to a lua file

Removes all kinds of problems with sorting, provides a ready-to-use function
list representation for genvimvim.lua, does not require specifying function name
twice (VimL function name (string) + f_ function name).

1 files changed, 42 insertions, 0 deletions

diff --git a/scripts/geneval.lua b/scripts/geneval.lua
new file mode 100644
index 0000000000..1f8a14d27b
--- /dev/null
+++ b/scripts/geneval.lua
@@ -0,0 +1,42 @@
+local nvimsrcdir = arg[1]
+local autodir = arg[2]
+
+if nvimsrcdir == '--help' then
+  print([[
+Usage:
+  lua geneval.lua src/nvim build/src/nvim/auto
+
+Will generate build/src/nvim/auto/funcs.generated.h with definition of functions 
+static const array.
+]])
+  os.exit(0)
+end
+
+package.path = nvimsrcdir .. '/?.lua;' .. package.path
+
+local funcsfname = autodir .. '/funcs.generated.h'
+local funcsfile = io.open(funcsfname, 'w')
+
+local funcs = require('eval')
+
+local sorted_funcs = {}
+for name, def in pairs(funcs.funcs) do
+  def.name = name
+  def.args = def.args or 0
+  if type(def.args) == 'number' then
+    def.args = {def.args, def.args}
+  elseif #def.args == 1 then
+    def.args[2] = 'MAX_FUNC_ARGS'
+  end
+  def.func = def.func or ('f_' .. def.name)
+  sorted_funcs[#sorted_funcs + 1] = def
+end
+table.sort(sorted_funcs, function(a, b) return a.name < b.name end)
+
+funcsfile:write('static const VimLFuncDef functions[] = {\n')
+for _, def in ipairs(sorted_funcs) do
+  funcsfile:write(('  { "%s", %s, %s, &%s },\n'):format(
+      def.name, def.args[1], def.args[2], def.func
+  ))
+end
+funcsfile:write('};\n')