introduce NCKEY_ESC, use it everywhere

include/notcurses/nckeys.h

@@ -119,6 +119,9 @@ extern "C" {
 #define NCKEY_SCROLL_DOWN NCKEY_BUTTON5
 #define NCKEY_RETURN      NCKEY_ENTER
 
+// Just aliases, ma'am, from the 128 characters common to ASCII+UTF8
+#define NCKEY_ESC      0x1b
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

src/input/input.cpp

@@ -142,7 +142,7 @@ const char* nckeystr(char32_t spkey){
 
 // Print the utf8 Control Pictures for otherwise unprintable ASCII
 char32_t printutf8(char32_t kp){
-  if(kp <= 27){
+  if(kp <= NCKEY_ESC){
     return 0x2400 + kp;
   }
   return kp;

src/lib/direct.cpp

@@ -153,7 +153,7 @@ cursor_yx_get(int ttyfd, int* y, int* x){
   while(read(ttyfd, &in, 1) == 1){
     bool valid = false;
     switch(state){
-      case CURSOR_ESC: valid = (in == '\x1b'); state = CURSOR_LSQUARE; break;
+      case CURSOR_ESC: valid = (in == NCKEY_ESC); state = CURSOR_LSQUARE; break;
       case CURSOR_LSQUARE: valid = (in == '['); state = CURSOR_ROW; break;
       case CURSOR_ROW:
         if(isdigit(in)){

src/lib/input.c

@@ -12,8 +12,6 @@
 #define CSIPREFIX "\x1b[<"
 static const char32_t NCKEY_CSI = 1;
 
-static const unsigned char ESC = 0x1b; // 27
-
 static sig_atomic_t resize_seen;
 
 void sigwinch_handler(int signo){
@@ -75,7 +73,7 @@ void input_free_esctrie(esctrie** eptr){
 
 static int
 ncinputlayer_add_input_escape(ncinputlayer* nc, const char* esc, char32_t special){
-  if(esc[0] != ESC || strlen(esc) < 2){ // assume ESC prefix + content
+  if(esc[0] != NCKEY_ESC || strlen(esc) < 2){ // assume ESC prefix + content
     fprintf(stderr, "Not an escape: %s (0x%x)\n", esc, special);
     return -1;
   }
@@ -205,7 +203,7 @@ handle_getc(ncinputlayer* nc, int kpress, ncinput* ni, int leftmargin, int topma
   if(kpress < 0){
     return -1;
   }
-  if(kpress == ESC){
+  if(kpress == NCKEY_ESC){
     const esctrie* esc = nc->inputescapes;
     int candidate = 0;
     while(esc && esc->special == NCKEY_INVALID && nc->inputbuf_occupied){
@@ -524,7 +522,7 @@ int prep_special_keys(ncinputlayer* nc){
 //fprintf(stderr, "no support for terminfo's %s\n", k->tinfo);
       continue;
     }
-    if(seq[0] != ESC){
+    if(seq[0] != NCKEY_ESC){
 //fprintf(stderr, "Terminfo's %s is not an escape sequence (%zub)\n", k->tinfo, strlen(seq));
       continue;
     }

src/lib/menu.c

@@ -609,7 +609,7 @@ bool ncmenu_offer_input(ncmenu* n, const ncinput* nc){
       return false;
     }
     return true;
-  }else if(nc->id == 0x1b){
+  }else if(nc->id == NCKEY_ESC){
     ncmenu_rollup(n);
     return true;
   }