Change to only link ncurses in tui

Makefile

@@ -3,10 +3,11 @@ debug_flags := -DDEBUG -Og -ggdb -feliminate-unused-debug-symbols
 sanitize_flags := -fsanitize=address -fsanitize=undefined
 # note: -fsanitize=leak not available on at least Mac 10.12
 release_flags := -DNDEBUG -O2 -s -D_FORTIFY_SOURCE=2 -fstack-protector-strong -fpie -Wl,-pie
+cli_library_flags :=
 ifeq ($(shell uname -s), Darwin)
-library_flags := -lncurses
+tui_library_flags := -lncurses
 else
-library_flags := -lncursesw
+tui_library_flags := -lncursesw
 endif
 common_source_files := field.c sim.c
 tui_source_files := $(common_source_files) tui_main.c
@@ -22,22 +23,22 @@ build/debug build/release: | build
 
 .PHONY: debug_cli
 debug_cli: | build/debug
-	@cc $(basic_flags) $(debug_flags) $(sanitize_flags) $(cli_source_files) -o build/debug/orca $(library_flags)
+	@cc $(basic_flags) $(debug_flags) $(sanitize_flags) $(cli_source_files) -o build/debug/orca $(cli_library_flags)
 
 .PHONY: debug_tui
 debug_tui: | build/debug
-	@cc $(basic_flags) $(debug_flags) $(sanitize_flags) $(tui_source_files) -o build/debug/orca_tui $(library_flags)
+	@cc $(basic_flags) $(debug_flags) $(sanitize_flags) $(tui_source_files) -o build/debug/orca_tui $(tui_library_flags)
 
 .PHONY: debug
 debug: debug_cli
 
 .PHONY: release_cli
 release_cli: | build/release
-	@cc $(basic_flags) $(release_flags) $(cli_source_files) -o build/release/orca $(library_flags)
+	@cc $(basic_flags) $(release_flags) $(cli_source_files) -o build/release/orca $(cli_library_flags)
 
 .PHONY: release_tui
 release_tui: | build/release
-	@cc $(basic_flags) $(release_flags) $(tui_source_files) -o build/release/orca_tui $(library_flags)
+	@cc $(basic_flags) $(release_flags) $(tui_source_files) -o build/release/orca_tui $(tui_library_flags)
 
 .PHONY: release
 release: release_cli

tui_main.c

@@ -32,7 +32,7 @@ int main() {
   // nodelay(stdscr, TRUE);
 
   Field field;
-  field_init_zeros(&field, 16, 16);
+  field_init_fill(&field, 16, 16, '.');
 
   printw("Type any character to fill it in an alternating grid, or\ntype '");
   attron(A_BOLD);