Workable split of library

Rather than trying to force things in via library constructors
and weak symbols and --whole-archive and pkg-config tricks, just
add new functions ncdirect_core_init() and notcurses_core_init().
libnotcurses has ncdirect_init() and notcurses_init(), which pass
through to these. apps linking against notcurses-core ought use
the _core_ variants directly. This gets exactly the linkage we
want, everywhere. Convert many PoCs to _core_ variants. #1301

Signed-off-by: nick black <dankamongmen@gmail.com>

CMakeLists.txt

@@ -9,9 +9,6 @@ set(CMAKE_C_STANDARD 11)
 set(CMAKE_C_VISIBILITY_PRESET hidden)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_VISIBILITY_PRESET hidden)
-# Passes -Wl,-no-as-needed to linker steps, necessary to reliably link
-# libnotcurses.so into executables...for now. This is grotesque. FIXME
-set(CMAKE_LINK_WHAT_YOU_USE ON)
 
 include(CTest)
 include(GNUInstallDirs)
@@ -602,7 +599,7 @@ target_include_directories(ncls
 )
 tarGET_Link_libraries(ncls
   PRIVATE
-    notcurses
+    notcurses++
 )
 
 ############################################################################

include/notcurses/direct.h

@@ -44,6 +44,10 @@ typedef struct ncplane ncdirectv;
 // Returns NULL on error, including any failure initializing terminfo.
 API struct ncdirect* ncdirect_init(const char* termtype, FILE* fp, uint64_t flags);
 
+// The same as ncdirect_init(), but without any multimedia functionality,
+// allowing for a svelter binary. Link with notcurses-core if this is used.
+API struct ncdirect* ncdirect_core_init(const char* termtype, FILE* fp, uint64_t flags);
+
 // Direct mode. This API can be used to colorize and stylize output generated
 // outside of notcurses, without ever calling notcurses_render(). These should
 // not be intermixed with standard Notcurses rendering.

include/notcurses/notcurses.h

@@ -892,6 +892,10 @@ API const char* notcurses_str_scalemode(ncscale_e scalemode);
 // failure initializing terminfo.
 API struct notcurses* notcurses_init(const notcurses_options* opts, FILE* fp);
 
+// The same as notcurses_init(), but without any multimedia functionality,
+// allowing for a svelter binary. Link with notcurses-core if this is used.
+API struct notcurses* notcurses_core_init(const notcurses_options* opts, FILE* fp);
+
 // Destroy a Notcurses context.
 API int notcurses_stop(struct notcurses* nc);
 

src/lib/direct.cpp

@@ -621,7 +621,7 @@ ncdirect_stop_minimal(void* vnc){
   return ret;
 }
 
-ncdirect* ncdirect_init(const char* termtype, FILE* outfp, uint64_t flags){
+ncdirect* ncdirect_core_init(const char* termtype, FILE* outfp, uint64_t flags){
   if(flags > (NCDIRECT_OPTION_NO_QUIT_SIGHANDLERS << 1)){ // allow them through with warning
     logwarn((struct notcurses*)NULL, "Passed unsupported flags 0x%016jx\n", (uintmax_t)flags);
   }

src/lib/internal.h

@@ -1082,6 +1082,12 @@ typedef struct ncvisual_implementation {
 extern const ncvisual_implementation* visual_implementation
   __attribute__ ((visibility("default")));
 
+struct ncvisual* ncvisual_from_file(const char* filename)
+  __attribute__ ((visibility("default")));
+
+struct ncdirect* ncdirect_core_init(const char* termtype, FILE* outfp, uint64_t flags)
+  __attribute__ ((visibility("default")));
+
 #ifdef __cplusplus
 }
 #endif

src/lib/notcurses.c

@@ -882,7 +882,8 @@ int ncinputlayer_init(ncinputlayer* nilayer, FILE* infp){
 }
 
 // initialize a recursive mutex lock in a way that works on both glibc + musl
-int recursive_lock_init(pthread_mutex_t *lock){
+static int
+recursive_lock_init(pthread_mutex_t *lock){
 #ifndef __GLIBC__
 #define PTHREAD_MUTEX_RECURSIVE_NP PTHREAD_MUTEX_RECURSIVE
 #endif
@@ -905,7 +906,7 @@ int recursive_lock_init(pthread_mutex_t *lock){
 #endif
 }
 
-notcurses* notcurses_init(const notcurses_options* opts, FILE* outfp){
+notcurses* notcurses_core_init(const notcurses_options* opts, FILE* outfp){
   notcurses_options defaultopts;
   memset(&defaultopts, 0, sizeof(defaultopts));
   if(!opts){

src/lib/visual.cpp

@@ -4,7 +4,8 @@
 #include "visual-details.h"
 #include "internal.h"
 
-const __attribute__ ((weak)) ncvisual_implementation* visual_implementation = nullptr;
+const __attribute__ ((weak))
+ncvisual_implementation* visual_implementation = nullptr;
 
 auto ncvisual_decode(ncvisual* nc) -> int {
   int ret = -1;
@@ -47,7 +48,8 @@ auto ncvisual_init(int loglevel) -> int {
   return ret;
 }
 
-auto ncvisual_from_file(const char* filename) -> ncvisual* {
+auto __attribute__ ((weak))
+ncvisual_from_file(const char* filename) -> ncvisual* {
   ncvisual* ret = nullptr;
   if(visual_implementation){
     ret = visual_implementation->ncvisual_from_file(filename);

src/media/ffmpeg.cpp

@@ -289,7 +289,7 @@ auto ffmpeg_create() -> ncvisual* {
   return nc;
 }
 
-ncvisual* ffmpeg_from_file(const char* filename) {
+ncvisual* ncvisual_from_file(const char* filename) {
   AVStream* st;
   ncvisual* ncv = ffmpeg_create();
   if(ncv == nullptr){
@@ -594,7 +594,7 @@ const static ncvisual_implementation ffmpeg_impl = {
   .ncvisual_decode = ffmpeg_decode,
   .ncvisual_blit = ffmpeg_blit,
   .ncvisual_create = ffmpeg_create,
-  .ncvisual_from_file = ffmpeg_from_file,
+  .ncvisual_from_file = ncvisual_from_file,
   .ncvisual_printbanner = ffmpeg_printbanner,
   .ncvisual_details_seed = ffmpeg_details_seed,
   .ncvisual_details_destroy = ffmpeg_details_destroy,

src/media/shim.c

@@ -0,0 +1,10 @@
+#include "notcurses/direct.h"
+#include "internal.h"
+
+ncdirect* ncdirect_init(const char* termtype, FILE* outfp, uint64_t flags){
+  return ncdirect_core_init(termtype, outfp, flags);
+}
+
+notcurses* notcurses_init(const notcurses_options* opts, FILE* outfp){
+  return notcurses_core_init(opts, outfp);
+}

src/poc/cjkscroll.c

@@ -7,7 +7,7 @@ int main(void){
   notcurses_options nopts = {
     .flags = NCOPTION_INHIBIT_SETLOCALE,
   };
-  struct notcurses* nc = notcurses_init(&nopts, NULL);
+  struct notcurses* nc = notcurses_core_init(&nopts, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/direct-input.c

@@ -4,7 +4,7 @@
 #include <notcurses/direct.h>
 
 int main(void){
-  struct ncdirect* n = ncdirect_init(NULL, NULL, 0);
+  struct ncdirect* n = ncdirect_core_init(NULL, NULL, 0);
   if(n == NULL){
     return EXIT_FAILURE;
   }

src/poc/direct.c

@@ -14,7 +14,7 @@ int main(void){
     return EXIT_FAILURE;
   }
   struct ncdirect* n; // see bug #391
-  if((n = ncdirect_init(NULL, NULL, 0)) == NULL){
+  if((n = ncdirect_core_init(NULL, NULL, 0)) == NULL){
     return EXIT_FAILURE;
   }
   int dimy = ncdirect_dim_y(n);

src/poc/dirgb.c

@@ -56,7 +56,7 @@ int main(void){
   if(!setlocale(LC_ALL, "")){
     return EXIT_FAILURE;
   }
-  struct ncdirect* nc = ncdirect_init(NULL, stdout, 0);
+  struct ncdirect* nc = ncdirect_core_init(NULL, stdout, 0);
   if(!nc){
     return EXIT_FAILURE;
   }

src/poc/dirlines.c

@@ -6,7 +6,7 @@ int main(void){
   if(!setlocale(LC_ALL, "")){
     return EXIT_FAILURE;
   }
-  struct ncdirect* n = ncdirect_init(NULL, stdout, 0);
+  struct ncdirect* n = ncdirect_core_init(NULL, stdout, 0);
   putchar('\n');
   for(int i = 0 ; i < 15 ; ++i){
     uint64_t c1 = 0, c2 = 0;

src/poc/fileroller.c

@@ -45,7 +45,7 @@ int main(int argc, char** argv){
     .flags = NCOPTION_INHIBIT_SETLOCALE |
               NCOPTION_SUPPRESS_BANNERS,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   struct ncplane* n = notcurses_stdplane(nc);
   ncplane_set_scrolling(n, true);
   while(*++argv){

src/poc/gradients.c

@@ -72,7 +72,7 @@ int main(void){
   struct notcurses_options opts = {
     .flags = NCOPTION_INHIBIT_SETLOCALE,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/kittyzapper.c

@@ -1,7 +1,7 @@
 #include <notcurses/direct.h>
 
 int main(void){
-  struct ncdirect* n = ncdirect_init(NULL, NULL, 0);
+  struct ncdirect* n = ncdirect_core_init(NULL, NULL, 0);
   if(!n){
     return EXIT_FAILURE;
   }

src/poc/menu.c

@@ -66,7 +66,7 @@ int main(void){
   notcurses_options opts = {
     .flags = NCOPTION_INHIBIT_SETLOCALE,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/pixels.c

@@ -11,7 +11,7 @@ int main(void){
     .tv_sec = 1,
     .tv_nsec = 500000000,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   int dimy, dimx;
   struct ncplane* std = notcurses_stddim_yx(nc, &dimy, &dimx);
   struct ncvisual* ncv = ncvisual_from_plane(std, NCBLIT_2x1, 0, 0, dimy / 2, dimx / 2);

src/poc/procroller.c

@@ -46,7 +46,7 @@ int main(int argc, char** argv){
     .flags = NCOPTION_INHIBIT_SETLOCALE |
               NCOPTION_SUPPRESS_BANNERS,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/progbar.c

@@ -110,7 +110,7 @@ pbar_make(struct notcurses* nc, uint64_t flags){
 }
 
 int main(void){
-  struct notcurses* nc = notcurses_init(NULL, NULL);
+  struct notcurses* nc = notcurses_core_init(NULL, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/rgb.c

@@ -11,7 +11,7 @@ int main(void){
   struct notcurses_options opts = {
     .flags = NCOPTION_INHIBIT_SETLOCALE | NCOPTION_NO_ALTERNATE_SCREEN,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/rtl.c

@@ -5,7 +5,7 @@ int main(void){
   struct notcurses_options opts = {
     .flags = NCOPTION_NO_ALTERNATE_SCREEN,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   if(!nc){
     return EXIT_FAILURE;
   }

src/poc/scroll.c

@@ -7,7 +7,7 @@ int main(void){
   struct notcurses_options opts = {
     .flags = NCOPTION_INHIBIT_SETLOCALE,
   };
-  struct notcurses* nc = notcurses_init(&opts, NULL);
+  struct notcurses* nc = notcurses_core_init(&opts, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/sgr-direct.c

@@ -8,7 +8,7 @@ int main(void){
   if(!setlocale(LC_ALL, "")){
     return EXIT_FAILURE;
   }
-  struct ncdirect* nc = ncdirect_init(NULL, stdout, 0);
+  struct ncdirect* nc = ncdirect_core_init(NULL, stdout, 0);
   if(!nc){
     return EXIT_FAILURE;
   }

src/poc/sgr-full.c

@@ -6,7 +6,7 @@ int main(void){
   struct notcurses_options nopts = {
     .flags = NCOPTION_NO_ALTERNATE_SCREEN,
   };
-  struct notcurses* nc = notcurses_init(&nopts, NULL);
+  struct notcurses* nc = notcurses_core_init(&nopts, NULL);
   if(nc == NULL){
     return EXIT_FAILURE;
   }

src/poc/zalgo.c

@@ -5,7 +5,7 @@ int main(void){
   struct notcurses_options nops = {
     .flags = NCOPTION_NO_ALTERNATE_SCREEN,
   };
-  struct notcurses* nc = notcurses_init(&nops, NULL);
+  struct notcurses* nc = notcurses_core_init(&nops, NULL);
   struct ncplane* n = notcurses_stdplane(nc);
   const int y = 10;
   ncplane_putstr_aligned(n, y + 0, NCALIGN_CENTER, "Pack my box with five dozen liquor jugs.");