refactor: move some structs out of buffer_defs.h (#24878)

src/nvim/mapping.c

@@ -61,6 +61,48 @@ static mapblock_T *(maphash[MAX_MAPHASH]) = { 0 };
                        (MODE_NORMAL | MODE_VISUAL | MODE_SELECT | \
                         MODE_OP_PENDING | MODE_TERMINAL)) ? (c1) : ((c1) ^ 0x80))
 
+/// All possible |:map-arguments| usable in a |:map| command.
+///
+/// The <special> argument has no effect on mappings and is excluded from this
+/// struct declaration. |:noremap| is included, since it behaves like a map
+/// argument when used in a mapping.
+///
+/// @see mapblock_T
+struct map_arguments {
+  bool buffer;
+  bool expr;
+  bool noremap;
+  bool nowait;
+  bool script;
+  bool silent;
+  bool unique;
+  bool replace_keycodes;
+
+  /// The {lhs} of the mapping.
+  ///
+  /// vim limits this to MAXMAPLEN characters, allowing us to use a static
+  /// buffer. Setting lhs_len to a value larger than MAXMAPLEN can signal
+  /// that {lhs} was too long and truncated.
+  char lhs[MAXMAPLEN + 1];
+  size_t lhs_len;
+
+  /// Unsimplifed {lhs} of the mapping. If no simplification has been done then alt_lhs_len is 0.
+  char alt_lhs[MAXMAPLEN + 1];
+  size_t alt_lhs_len;
+
+  char *rhs;  /// The {rhs} of the mapping.
+  size_t rhs_len;
+  LuaRef rhs_lua;  /// lua function as {rhs}
+  bool rhs_is_noop;  /// True when the {rhs} should be <Nop>.
+
+  char *orig_rhs;  /// The original text of the {rhs}.
+  size_t orig_rhs_len;
+  char *desc;  /// map description
+};
+typedef struct map_arguments MapArguments;
+#define MAP_ARGUMENTS_INIT { false, false, false, false, false, false, false, false, \
+                             { 0 }, 0, { 0 }, 0, NULL, 0, LUA_NOREF, false, NULL, 0, NULL }
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "mapping.c.generated.h"
 #endif