vim-patch:8.1.1886: command line expansion code is spread out (#19861)

Problem:    Command line expansion code is spread out.
Solution:   Move the code to cmdexpand.c. (Yegappan Lakshmanan, closes vim/vim#4831)
66b51420e0

src/nvim/cmdexpand.h

@@ -0,0 +1,43 @@
+#ifndef NVIM_CMDEXPAND_H
+#define NVIM_CMDEXPAND_H
+
+#include "nvim/eval/typval.h"
+#include "nvim/garray.h"
+#include "nvim/types.h"
+
+// Values for nextwild() and ExpandOne().  See ExpandOne() for meaning.
+
+enum {
+  WILD_FREE        = 1,
+  WILD_EXPAND_FREE = 2,
+  WILD_EXPAND_KEEP = 3,
+  WILD_NEXT        = 4,
+  WILD_PREV        = 5,
+  WILD_ALL         = 6,
+  WILD_LONGEST     = 7,
+  WILD_ALL_KEEP    = 8,
+  WILD_CANCEL      = 9,
+  WILD_APPLY       = 10,
+};
+
+enum {
+  WILD_LIST_NOTFOUND        = 0x01,
+  WILD_HOME_REPLACE         = 0x02,
+  WILD_USE_NL               = 0x04,
+  WILD_NO_BEEP              = 0x08,
+  WILD_ADD_SLASH            = 0x10,
+  WILD_KEEP_ALL             = 0x20,
+  WILD_SILENT               = 0x40,
+  WILD_ESCAPE               = 0x80,
+  WILD_ICASE                = 0x100,
+  WILD_ALLLINKS             = 0x200,
+  WILD_IGNORE_COMPLETESLASH = 0x400,
+  WILD_NOERROR              = 0x800,  ///< sets EW_NOERROR
+  WILD_BUFLASTUSED          = 0x1000,
+  BUF_DIFF_FILTER           = 0x2000,
+};
+
+#ifdef INCLUDE_GENERATED_DECLARATIONS
+# include "cmdexpand.h.generated.h"
+#endif
+#endif  // NVIM_CMDEXPAND_H