shortcuts: group the setting of key string and keycode into one function

And instead of using two key types, just use a bool to indicate whether
a keystroke involves Meta.

src/global.c

@@ -339,8 +339,7 @@ void add_to_sclist(int menus, const char *scstring, void (*func)(void), int togg
     s->toggle = toggle;
     if (toggle)
 	s->ordinal = ++counter;
-    s->keystr = (char *) scstring;
-    assign_keyinfo(s);
+    assign_keyinfo(s, scstring);
 
 #ifdef DEBUG
     fprintf(stderr, "Setting sequence to %d for shortcut \"%s\" in menus %x\n", s->seq, scstring, s->menus);
@@ -381,7 +380,7 @@ int sc_seq_or(void (*func)(void), int defaultval)
     const sc *s = first_sc_for(currmenu, func);
 
     if (s) {
-	meta_key = (s->type == META);
+	meta_key = s->meta;
 	return s->seq;
     }
     /* else */
@@ -399,18 +398,17 @@ functionptrtype func_from_key(int *kbinput)
 	return NULL;
 }
 
-/* Assign the info to the shortcut struct.
- * Assumes keystr is already assigned, naturally. */
-void assign_keyinfo(sc *s)
+/* Set the string and its corresponding keycode for the given shortcut s. */
+void assign_keyinfo(sc *s, const char *keystring)
 {
-    s->type = DIRECT;
+    s->keystr = (char *)keystring;
+    s->meta = (keystring[0] == 'M');
 
     if (s->keystr[0] == '^') {
 	assert(strlen(s->keystr) > 1);
 	s->seq = s->keystr[1] - 64;
-    } else if (s->keystr[0] == 'M') {
+    } else if (s->meta) {
 	assert(strlen(s->keystr) > 2);
-	s->type = META;
 	s->seq = tolower((int) s->keystr[2]);
     } else if (s->keystr[0] == 'F') {
 	assert(strlen(s->keystr) > 1);

src/nano.h

@@ -187,10 +187,6 @@ typedef enum {
     CENTERING, FLOWING, STATIONARY
 } update_type;
 
-typedef enum {
-    DIRECT, META
-}  key_type;
-
 typedef enum {
     ADD, DEL, BACK, CUT, CUT_EOF, REPLACE,
 #ifndef DISABLE_WRAPPING
@@ -441,8 +437,8 @@ typedef struct rcoption {
 typedef struct sc {
     char *keystr;
 	/* The shortcut key for a function, ASCII version. */
-    key_type type;
-	/* What kind of command key it is, for convenience later. */
+    bool meta;
+	/* Whether this is a Meta keystroke. */
     int seq;
 	/* The actual sequence to check once the type is determined. */
     int menus;

src/proto.h

@@ -362,7 +362,7 @@ size_t length_of_list(int menu);
 const sc *first_sc_for(int menu, void (*func)(void));
 int sc_seq_or(void (*func)(void), int defaultval);
 functionptrtype func_from_key(int *kbinput);
-void assign_keyinfo(sc *s);
+void assign_keyinfo(sc *s, const char *keystring);
 void print_sclist(void);
 void shortcut_init(void);
 #ifndef DISABLE_COLOR

src/rcfile.c

@@ -470,12 +470,11 @@ void parse_binding(char *ptr, bool dobind)
 	    goto free_copy;
 	}
 
-	newsc->keystr = keycopy;
 	newsc->menus = menu;
-	assign_keyinfo(newsc);
+	assign_keyinfo(newsc, keycopy);
 
-	/* Do not allow rebinding the equivalent of the Escape key. */
-	if (newsc->type == META && newsc->seq == 91) {
+	/* Do not allow rebinding a frequent escape-sequence starter: Esc [. */
+	if (newsc->meta && newsc->seq == 91) {
 	    rcfile_error(N_("Sorry, keystroke \"%s\" may not be rebound"), newsc->keystr);
 	    free(newsc);
 	    goto free_copy;

src/winio.c

@@ -1558,7 +1558,7 @@ int get_mouseinput(int *mouse_x, int *mouse_y, bool allow_shortcuts)
 	    /* And put the corresponding key into the keyboard buffer. */
 	    if (f != NULL) {
 		const sc *s = first_sc_for(currmenu, f->scfunc);
-		unget_kbinput(s->seq, s->type == META);
+		unget_kbinput(s->seq, s->meta);
 	    }
 	    return 1;
 	} else
@@ -1616,8 +1616,8 @@ const sc *get_shortcut(int *kbinput)
 #endif
 
     for (s = sclist; s != NULL; s = s->next) {
-	if ((s->menus & currmenu) && *kbinput == s->seq
-		&& meta_key == (s->type == META)) {
+	if ((s->menus & currmenu) && *kbinput == s->seq &&
+					meta_key == s->meta) {
 #ifdef DEBUG
 	    fprintf (stderr, "matched seq '%s'  (menu is %x from %x)\n",
 				s->keystr, currmenu, s->menus);