basic/glyph-util: introduce optional_glyph() to wrap emoji_enabled()

src/basic/glyph-util.c

@@ -35,6 +35,7 @@ const char* glyph_full(Glyph code, bool force_utf) {
         static const char* const draw_table[2][_GLYPH_MAX] = {
                 /* ASCII fallback */
                 [false] = {
+                        [GLYPH_SPACE]                   = " ",
                         [GLYPH_TREE_VERTICAL]           = "| ",
                         [GLYPH_TREE_BRANCH]             = "|-",
                         [GLYPH_TREE_RIGHT]              = "`-",
@@ -87,6 +88,9 @@ const char* glyph_full(Glyph code, bool force_utf) {
 
                 /* UTF-8 */
                 [true] = {
+                        /* This exists to allow more consistent handling of optional whitespace */
+                        [GLYPH_SPACE]                   = " ",
+
                         /* The following are multiple glyphs in both ASCII and in UNICODE */
                         [GLYPH_TREE_VERTICAL]           = u8"│ ",
                         [GLYPH_TREE_BRANCH]             = u8"├─",

src/basic/glyph-util.h

@@ -7,6 +7,7 @@
 #include "macro.h"
 
 typedef enum Glyph {
+        GLYPH_SPACE,
         GLYPH_TREE_VERTICAL,
         GLYPH_TREE_BRANCH,
         GLYPH_TREE_RIGHT,
@@ -70,6 +71,10 @@ static inline const char* glyph(Glyph code) {
         return glyph_full(code, false);
 }
 
+static inline const char* optional_glyph(Glyph code) {
+        return emoji_enabled() ? glyph(code) : "";
+}
+
 static inline const char* glyph_check_mark(bool b) {
         return b ? glyph(GLYPH_CHECK_MARK) : glyph(GLYPH_CROSS_MARK);
 }