refactor(options): make os_oldval and os_newval use OptValData

src/nvim/option.c

@@ -3683,25 +3683,17 @@ static const char *set_option(const int opt_idx, void *varp, OptVal value, int o
   }
   if (did_set_cb != NULL) {
     // TODO(famiu): make os_oldval and os_newval use OptVal.
-    optset_T did_set_cb_args = (value.type == kOptValTypeNumber)
-                                 ? (optset_T){ .os_varp = varp,
+    optset_T did_set_cb_args = {
+      .os_varp = varp,
       .os_flags = opt_flags,
-                                               .os_oldval.number = old_value.data.number,
-                                               .os_newval.number = value.data.number,
+      .os_oldval = old_value.data,
+      .os_newval = value.data,
       .os_doskip = false,
       .os_errbuf = NULL,
       .os_errbuflen = 0,
       .os_buf = curbuf,
-                                               .os_win = curwin }
-                                 : (optset_T){ .os_varp = varp,
-                                               .os_flags = opt_flags,
-                                               .os_oldval.boolean = old_value.data.boolean,
-                                               .os_newval.boolean = value.data.boolean,
-                                               .os_doskip = false,
-                                               .os_errbuf = NULL,
-                                               .os_errbuflen = 0,
-                                               .os_buf = curbuf,
-                                               .os_win = curwin };
+      .os_win = curwin
+    };
 
     errmsg = did_set_cb(&did_set_cb_args);
     doskip = did_set_cb_args.os_doskip;

src/nvim/option_defs.h

@@ -17,16 +17,17 @@ typedef enum {
   kOptValTypeString,
 } OptValType;
 
-/// Option value
-typedef struct {
-  OptValType type;
-
-  union {
+typedef union {
   // boolean options are actually tri-states because they have a third "None" value.
   TriState boolean;
   OptInt number;
   String string;
-  } data;
+} OptValData;
+
+/// Option value
+typedef struct {
+  OptValType type;
+  OptValData data;
 } OptVal;
 
 /// :set operator types
@@ -46,19 +47,10 @@ typedef struct {
   int os_idx;
   int os_flags;
 
-  /// old value of the option (can be a string, number or a boolean)
-  union {
-    const OptInt number;
-    const bool boolean;
-    const char *string;
-  } os_oldval;
-
-  /// new value of the option (can be a string, number or a boolean)
-  union {
-    const OptInt number;
-    const bool boolean;
-    const char *string;
-  } os_newval;
+  /// Old value of the option.
+  OptValData os_oldval;
+  /// New value of the option.
+  OptValData os_newval;
 
   /// When set by the called function: Stop processing the option further.
   /// Currently only used for boolean options.

src/nvim/optionstr.c

@@ -860,7 +860,7 @@ int expand_set_backspace(optexpand_T *args, int *numMatches, char ***matches)
 const char *did_set_backupcopy(optset_T *args)
 {
   buf_T *buf = (buf_T *)args->os_buf;
-  const char *oldval = args->os_oldval.string;
+  const char *oldval = args->os_oldval.string.data;
   int opt_flags = args->os_flags;
   char *bkc = p_bkc;
   unsigned *flags = &bkc_flags;
@@ -1459,7 +1459,7 @@ const char *did_set_fileformat(optset_T *args)
 {
   buf_T *buf = (buf_T *)args->os_buf;
   char **varp = (char **)args->os_varp;
-  const char *oldval = args->os_oldval.string;
+  const char *oldval = args->os_oldval.string.data;
   int opt_flags = args->os_flags;
   if (!MODIFIABLE(buf) && !(opt_flags & OPT_GLOBAL)) {
     return e_modifiable;
@@ -1512,7 +1512,7 @@ const char *did_set_filetype_or_syntax(optset_T *args)
     return e_invarg;
   }
 
-  args->os_value_changed = strcmp(args->os_oldval.string, *varp) != 0;
+  args->os_value_changed = strcmp(args->os_oldval.string.data, *varp) != 0;
 
   // Since we check the value, there is no need to set P_INSECURE,
   // even when the value comes from a modeline.
@@ -2103,7 +2103,7 @@ const char *did_set_sessionoptions(optset_T *args)
   }
   if ((ssop_flags & SSOP_CURDIR) && (ssop_flags & SSOP_SESDIR)) {
     // Don't allow both "sesdir" and "curdir".
-    const char *oldval = args->os_oldval.string;
+    const char *oldval = args->os_oldval.string.data;
     (void)opt_strings_flags(oldval, p_ssop_values, &ssop_flags, true);
     return e_invarg;
   }
@@ -2224,7 +2224,7 @@ const char *did_set_signcolumn(optset_T *args)
 {
   win_T *win = (win_T *)args->os_win;
   char **varp = (char **)args->os_varp;
-  const char *oldval = args->os_oldval.string;
+  const char *oldval = args->os_oldval.string.data;
   if (check_signcolumn(*varp) != OK) {
     return e_invarg;
   }
@@ -2578,7 +2578,7 @@ const char *did_set_virtualedit(optset_T *args)
   } else {
     if (opt_strings_flags(ve, p_ve_values, flags, true) != OK) {
       return e_invarg;
-    } else if (strcmp(ve, args->os_oldval.string) != 0) {
+    } else if (strcmp(ve, args->os_oldval.string.data) != 0) {
       // Recompute cursor position in case the new 've' setting
       // changes something.
       validate_virtcol_win(win);
@@ -2753,8 +2753,8 @@ const char *did_set_string_option(buf_T *buf, win_T *win, int opt_idx, char **va
     .os_varp = varp,
     .os_idx = opt_idx,
     .os_flags = opt_flags,
-    .os_oldval.string = oldval,
-    .os_newval.string = *varp,
+    .os_oldval.string = cstr_as_string(oldval),
+    .os_newval.string = cstr_as_string(*varp),
     .os_value_checked = false,
     .os_value_changed = false,
     .os_restore_chartab = false,