api/options: add option metadata

src/nvim/api/vim.c

@@ -970,6 +970,62 @@ Object nvim_get_option(String name, Error *err)
   return get_option_from(NULL, SREQ_GLOBAL, name, err);
 }
 
+Dictionary nvim_get_vimoption_info(Error *err)
+  FUNC_API_SINCE(7)
+{
+  Dictionary retval = ARRAY_DICT_INIT;
+
+  vimoption_T *all_options = get_all_vimoptions();
+
+  int i = 0;
+  vimoption_T opt;
+  while (true) {
+    opt = all_options[i++];
+    if (opt.fullname == NULL) {
+      break;
+    }
+
+    Dictionary opt_dict = ARRAY_DICT_INIT;
+
+    PUT(opt_dict, "fullname", STRING_OBJ(cstr_to_string(opt.fullname)));
+    PUT(opt_dict, "shortname", STRING_OBJ(cstr_to_string(opt.shortname)));
+    PUT(opt_dict, "is_global",  BOOLEAN_OBJ(opt.flags & OPT_GLOBAL));
+    PUT(opt_dict, "is_local",  BOOLEAN_OBJ(opt.flags & OPT_LOCAL));
+    PUT(opt_dict, "flag",  INTEGER_OBJ(opt.flags));
+    PUT(opt_dict, "sourced_sid", INTEGER_OBJ(opt.last_set.script_ctx.sc_sid));
+    PUT(opt_dict, "sourced_lnum", INTEGER_OBJ(opt.last_set.script_ctx.sc_lnum));
+    PUT(opt_dict, "type", STRING_OBJ(get_option_type_string(opt)));
+
+    PUT(retval, opt.fullname, DICTIONARY_OBJ(opt_dict));
+  }
+
+  return retval;
+}
+
+Dictionary nvim_get_option_info(String name, Error *err)
+  FUNC_API_SINCE(7)
+{
+  Dictionary retval = ARRAY_DICT_INIT;
+
+  get_option_from(NULL, SREQ_GLOBAL, name, err);
+  if (ERROR_SET(err)) {
+    return retval;
+  }
+
+  int opt_idx = findoption_len((const char *)name.data, name.size);
+  vimoption_T opt = get_vimoption(opt_idx);
+
+  PUT(retval, "fullname", STRING_OBJ(cstr_to_string(opt.fullname)));
+  PUT(retval, "shortname", STRING_OBJ(cstr_to_string(opt.shortname)));
+  PUT(retval, "is_global",  BOOLEAN_OBJ(opt.flags & OPT_GLOBAL));
+  PUT(retval, "is_local",  BOOLEAN_OBJ(opt.flags & OPT_LOCAL));
+  PUT(retval, "flag",  INTEGER_OBJ(opt.flags));
+  PUT(retval, "sourced_sid", INTEGER_OBJ(opt.last_set.script_ctx.sc_sid));
+  PUT(retval, "sourced_lnum", INTEGER_OBJ(opt.last_set.script_ctx.sc_lnum));
+
+  return retval;
+}
+
 /// Sets an option value.
 ///
 /// @param channel_id

src/nvim/option.c

@@ -102,13 +102,6 @@
 #define OPT_BUF(x)  (idopt_T)(PV_BUF + (int)(x))
 #define OPT_BOTH(x) (idopt_T)(PV_BOTH + (int)(x))
 
-
-// WV_ and BV_ values get typecasted to this for the "indir" field
-typedef enum {
-  PV_NONE = 0,
-  PV_MAXVAL = 0xffff      // to avoid warnings for value out of range
-} idopt_T;
-
 /*
  * Options local to a window have a value local to a buffer and global to all
  * buffers.  Indicate this by setting "var" to VAR_WIN.
@@ -195,20 +188,6 @@ static long p_sts_nopaste;
 static long p_tw_nopaste;
 static long p_wm_nopaste;
 
-typedef struct vimoption {
-  char        *fullname;        // full option name
-  char        *shortname;       // permissible abbreviation
-  uint32_t flags;               // see below
-  char_u      *var;             // global option: pointer to variable;
-                                // window-local option: VAR_WIN;
-                                // buffer-local option: global value
-  idopt_T indir;                // global option: PV_NONE;
-                                // local option: indirect option index
-  char_u      *def_val[2];      // default values for variable (vi and vim)
-  LastSet last_set;             // script in which the option was last set
-# define SCTX_INIT , { 0, 0, 0 }
-} vimoption_T;
-
 #define VI_DEFAULT  0       // def_val[VI_DEFAULT] is Vi default value
 #define VIM_DEFAULT 1       // def_val[VIM_DEFAULT] is Vim default value
 
@@ -3617,10 +3596,14 @@ static void set_option_sctx_idx(int opt_idx, int opt_flags, sctx_T script_ctx)
 {
   int both = (opt_flags & (OPT_LOCAL | OPT_GLOBAL)) == 0;
   int indir = (int)options[opt_idx].indir;
-  const LastSet last_set = { .script_ctx =
-    { script_ctx.sc_sid, script_ctx.sc_seq,
-      script_ctx.sc_lnum + sourcing_lnum },
-    current_channel_id };
+  const LastSet last_set = {
+    .script_ctx = {
+      script_ctx.sc_sid,
+      script_ctx.sc_seq,
+      script_ctx.sc_lnum + sourcing_lnum
+    },
+    current_channel_id
+  };
 
   // Remember where the option was set.  For local options need to do that
   // in the buffer or window structure.
@@ -7174,3 +7157,22 @@ long get_sidescrolloff_value(void)
 {
   return curwin->w_p_siso < 0 ? p_siso : curwin->w_p_siso;
 }
+
+vimoption_T get_vimoption(int opt_idx)
+{
+  return options[opt_idx];
+}
+
+vimoption_T* get_all_vimoptions(void)
+{
+  return options;
+}
+
+String get_option_type_string(vimoption_T opt)
+{
+  return cstr_to_string(
+          opt.flags & P_BOOL ? "boolean"
+          : opt.flags & P_NUM ? "number"
+          : opt.flags & P_STRING ? "string"
+          : "unknown");
+}

src/nvim/option.h

@@ -21,6 +21,27 @@ typedef enum {
   OPT_NOWIN    = 32,  ///< Don’t set window-local options.
 } OptionFlags;
 
+// WV_ and BV_ values get typecasted to this for the "indir" field
+typedef enum {
+  PV_NONE = 0,
+  PV_MAXVAL = 0xffff      // to avoid warnings for value out of range
+} idopt_T;
+
+typedef struct vimoption {
+  char        *fullname;        // full option name
+  char        *shortname;       // permissible abbreviation
+  uint32_t flags;               // see below
+  char_u      *var;             // global option: pointer to variable;
+                                // window-local option: VAR_WIN;
+                                // buffer-local option: global value
+  idopt_T indir;                // global option: PV_NONE;
+                                // local option: indirect option index
+  char_u      *def_val[2];      // default values for variable (vi and vim)
+  LastSet last_set;             // script in which the option was last set
+# define SCTX_INIT , { 0, 0, 0 }
+} vimoption_T;
+
+
 #ifdef INCLUDE_GENERATED_DECLARATIONS
 # include "option.h.generated.h"
 #endif