add NCSTYLE_STRUCK #1138

include/notcurses/notcurses.h

@@ -615,6 +615,7 @@ API void cell_release(struct ncplane* n, cell* c);
 #define NCSTYLE_INVIS     0x0002u
 #define NCSTYLE_PROTECT   0x0001u
 #define NCSTYLE_ITALIC    0x0100u
+#define NCSTYLE_STRUCK    0x0200u
 #define NCSTYLE_NONE      0
 
 // Set the specified style bits for the cell 'c', whether they're actively

src/lib/direct.cpp

@@ -643,10 +643,15 @@ int ncdirect_styles_on(ncdirect* n, unsigned stylebits){
   uint32_t stylemask = n->stylemask | stylebits;
   if(ncdirect_style_emit(n, n->tcache.sgr, stylemask, n->ttyfp) == 0){
     if(term_setstyle(n->ttyfp, n->stylemask, stylemask, NCSTYLE_ITALIC,
-                     n->tcache.italics, n->tcache.italoff) == 0){
-      n->stylemask = stylemask;
+                     n->tcache.italics, n->tcache.italoff)){
       return 0;
     }
+    if(term_setstyle(n->ttyfp, n->stylemask, stylemask, NCSTYLE_STRUCK,
+                     n->tcache.struck, n->tcache.struckoff)){
+      return -1;
+    }
+    n->stylemask = stylemask;
+    return 0;
   }
   return -1;
 }
@@ -656,10 +661,15 @@ int ncdirect_styles_off(ncdirect* n, unsigned stylebits){
   uint32_t stylemask = n->stylemask & ~stylebits;
   if(ncdirect_style_emit(n, n->tcache.sgr, stylemask, n->ttyfp) == 0){
     if(term_setstyle(n->ttyfp, n->stylemask, stylemask, NCSTYLE_ITALIC,
-                     n->tcache.italics, n->tcache.italoff) == 0){
-      n->stylemask = stylemask;
-      return 0;
+                     n->tcache.italics, n->tcache.italoff)){
+      return -1;
+    }
+    if(term_setstyle(n->ttyfp, n->stylemask, stylemask, NCSTYLE_STRUCK,
+                     n->tcache.struck, n->tcache.struckoff)){
+      return -1;
     }
+    n->stylemask = stylemask;
+    return 0;
   }
   return -1;
 }
@@ -669,10 +679,15 @@ int ncdirect_styles_set(ncdirect* n, unsigned stylebits){
   uint32_t stylemask = stylebits;
   if(ncdirect_style_emit(n, n->tcache.sgr, stylemask, n->ttyfp) == 0){
     if(term_setstyle(n->ttyfp, n->stylemask, stylemask, NCSTYLE_ITALIC,
-                     n->tcache.italics, n->tcache.italoff) == 0){
-      n->stylemask = stylemask;
-      return 0;
+                     n->tcache.italics, n->tcache.italoff)){
+      return -1;
     }
+    if(term_setstyle(n->ttyfp, n->stylemask, stylemask, NCSTYLE_STRUCK,
+                     n->tcache.struck, n->tcache.struckoff)){
+      return -1;
+    }
+    n->stylemask = stylemask;
+    return 0;
   }
   return -1;
 }

src/lib/internal.h

@@ -237,14 +237,16 @@ typedef struct tinfo {
   char* cnorm;    // restore cursor to default state
   char* hpa;      // horizontal position adjusment (move cursor on row)
   char* vpa;      // vertical position adjustment (move cursor on column)
-  char* standout; // CELL_STYLE_STANDOUT
-  char* uline;    // CELL_STYLE_UNDERLINK
-  char* reverse;  // CELL_STYLE_REVERSE
-  char* blink;    // CELL_STYLE_BLINK
-  char* dim;      // CELL_STYLE_DIM
-  char* bold;     // CELL_STYLE_BOLD
-  char* italics;  // CELL_STYLE_ITALIC
-  char* italoff;  // CELL_STYLE_ITALIC (disable)
+  char* standout; // NCSTYLE_STANDOUT
+  char* uline;    // NCSTYLE_UNDERLINK
+  char* reverse;  // NCSTYLE_REVERSE
+  char* blink;    // NCSTYLE_BLINK
+  char* dim;      // NCSTYLE_DIM
+  char* bold;     // NCSTYLE_BOLD
+  char* italics;  // NCSTYLE_ITALIC
+  char* italoff;  // NCSTYLE_ITALIC (disable)
+  char* struck;   // NCSTYLE_STRUCK
+  char* struckoff;// NCSTYLE_STRUCK (disable)
   char* initc;    // set a palette entry's RGB value
   char* oc;       // restore original colors
   char* clearscr; // erase screen and home cursor

src/lib/notcurses.c

@@ -1624,6 +1624,7 @@ unsigned notcurses_supported_styles(const notcurses* nc){
   styles |= nc->tcache.dim ? NCSTYLE_DIM : 0;
   styles |= nc->tcache.bold ? NCSTYLE_BOLD : 0;
   styles |= nc->tcache.italics ? NCSTYLE_ITALIC : 0;
+  styles |= nc->tcache.struck ? NCSTYLE_STRUCK : 0;
   return styles;
 }
 

src/lib/terminfo.c

@@ -144,5 +144,9 @@ int interrogate_terminfo(tinfo* ti){
       return -1;
     }
   }
+  // some control sequences are unavailable from terminfo, and we must instead
+  // hardcode them :/. use at your own peril!
+  ti->struck = "\x1b[9m";
+  ti->struckoff = "\x1b[29m";
   return 0;
 }

src/poc/sgr-direct.c

@@ -13,7 +13,7 @@ int main(void){
     return EXIT_FAILURE;
   }
   int e = 0;
-  for(unsigned i = 0 ; i < (NCSTYLE_ITALIC << 1u) ; ++i){
+  for(unsigned i = 0 ; i < (NCSTYLE_STRUCK << 1u) ; ++i){
     if(ncdirect_styles_set(nc, i)){
       ncdirect_stop(nc);
       return EXIT_FAILURE;

src/poc/sgr.c

@@ -50,7 +50,7 @@ int main(int argc, char** argv){
     --pivot;
   }
   int sgrcount = pivot + 1;
-  // generate all values
+  // generate all values, like a beast
   int cols = 0;
   while(pivot >= 0){
     int i;