♻️ Make termbox2 muliplatform with wasm support.

Makefile

@@ -3,6 +3,7 @@ prefix?=/usr/local
 termbox_cflags:=-std=c99 -Wall -Wextra -pedantic -Wno-unused-result -g -O0 -D_XOPEN_SOURCE -D_DEFAULT_SOURCE $(CFLAGS)
 termbox_demos:=demo/keyboard
 termbox_h:=termbox2.h
+termbox_h_in:=termbox2.h.in
 termbox_h_lib:=termbox2.h.lib
 termbox_ffi_h:=termbox2.ffi.h
 termbox_ffi_macro:=termbox2.ffi.macro
@@ -24,7 +25,10 @@ ifeq ($(shell $(CC) -dumpmachine | grep -q apple && echo 1), 1)
     termbox_ld_soname:=install_name
 endif
 
-all: $(termbox_demos) $(termbox_so) $(termbox_so_x) $(termbox_a)
+all: $(termbox_h) $(termbox_demos) $(termbox_so) $(termbox_so_x) $(termbox_a)
+
+$(termbox_h): $(termbox_h_in) tb_api.h tb_platform.h termbox2.c tb_posix.c tb_wasm.c assemble.awk
+	awk -f assemble.awk $(termbox_h_in) > $@
 
 $(termbox_demos): %: %.c
 	$(CC) -DTB_IMPL -DTB_LIB_OPTS -I. $(termbox_cflags) $^ -o $@
@@ -54,8 +58,8 @@ $(termbox_h_lib): $(termbox_h)
 	sed 's|0 // __tb_lib_opts|1 // __tb_lib_opts|' $(termbox_h) >$@
 
 terminfo:
-	awk -vg=0 'g==0{print} /BEGIN codegen h/{g=1; system("./codegen.sh h")} /END codegen h/{g=0; print} g==1{next}' termbox2.h >termbox2.h.tmp && mv -vf termbox2.h.tmp termbox2.h
-	awk -vg=0 'g==0{print} /BEGIN codegen c/{g=1; system("./codegen.sh c")} /END codegen c/{g=0; print} g==1{next}' termbox2.h >termbox2.h.tmp && mv -vf termbox2.h.tmp termbox2.h
+	awk -vg=0 'g==0{print} /BEGIN codegen h/{g=1; system("./codegen.sh h")} /END codegen h/{g=0; print} g==1{next}' tb_api.h >tb_api.h.tmp && mv -vf tb_api.h.tmp tb_api.h
+	awk -vg=0 'g==0{print} /BEGIN codegen c/{g=1; system("./codegen.sh c")} /END codegen c/{g=0; print} g==1{next}' tb_api.h >tb_api.h.tmp && mv -vf tb_api.h.tmp tb_api.h
 
 format:
 	clang-format -i termbox2.h
@@ -98,6 +102,6 @@ install_so: $(termbox_so_x_y_z)
 	ln -sf $(termbox_so_x_y_z) $(DESTDIR)$(prefix)/lib/$(termbox_so)
 
 clean:
-	rm -f $(termbox_demos) $(termbox_o) $(termbox_a) $(termbox_so) $(termbox_so_x) $(termbox_so_x_y_z) $(termbox_ffi_h) $(termbox_ffi_macro) $(termbox_h_lib) tests/**/observed.ansi
+	rm -f $(termbox_h) $(termbox_demos) $(termbox_o) $(termbox_a) $(termbox_so) $(termbox_so_x) $(termbox_so_x_y_z) $(termbox_ffi_h) $(termbox_ffi_macro) $(termbox_h_lib) tests/**/observed.ansi
 
 .PHONY: all lib terminfo format test test_local install install_lib install_h install_h_lib install_a install_so clean

assemble.awk

@@ -0,0 +1,122 @@
+# assemble.awk - Assembles termbox2.h from template and source files
+#
+# Usage: awk -f assemble.awk termbox2.h.in > termbox2.h
+#
+# Processes the template by:
+# 1. Inlining #include "foo.h" (stripping include guards)
+# 2. Injecting .c file contents at BEGIN/END markers
+#    (stripping #include "..." and #define TB_IMPL from .c files)
+
+function extract_include(line,    i, j) {
+    i = index(line, "\"")
+    if (i == 0) return ""
+    j = index(substr(line, i + 1), "\"")
+    if (j == 0) return ""
+    return substr(line, i + 1, j - 1)
+}
+
+# Inject a .c file, stripping the preamble (everything up to and including
+# the last #include "..." line). System #include <...> lines after the
+# preamble are kept.
+function strip_inject(file,    n, i, last_local, line, lines) {
+    n = 0
+    while ((getline line < file) > 0) {
+        lines[++n] = line
+    }
+    close(file)
+
+    # Find the last #include "..." line
+    last_local = 0
+    for (i = 1; i <= n; i++) {
+        if (lines[i] ~ /^#include "/) last_local = i
+    }
+
+    # Print everything after the preamble
+    for (i = last_local + 1; i <= n; i++) {
+        print lines[i]
+    }
+}
+
+# Read a header file, strip its include guard, inline nested #include "..."
+# Uses a unique prefix per call depth to avoid array clobbering
+function inline_header(file,    n, i, start, end, last, line, f, lines) {
+    n = 0
+    while ((getline line < file) > 0) {
+        n++
+        lines[file, n] = line
+    }
+    close(file)
+
+    start = 1
+    end = n
+
+    # Detect and strip include guard
+    if (n >= 2 && lines[file, 1] ~ /^#ifndef [A-Z_]+_H/ && lines[file, 2] ~ /^#define [A-Z_]+_H/) {
+        start = 3
+        for (last = n; last >= 1; last--) {
+            if (lines[file, last] ~ /^#endif/) {
+                end = last - 1
+                break
+            }
+        }
+    }
+
+    for (i = start; i <= end; i++) {
+        line = lines[file, i]
+        if (line ~ /^#include "/) {
+            f = extract_include(line)
+            if (f != "") {
+                inline_header(f)
+                continue
+            }
+        }
+        print line
+    }
+}
+
+{
+    # Inline headers at BEGIN/END header markers
+    if ($0 ~ /\/\* BEGIN header .+ \*\//) {
+        print
+        f = $0
+        sub(/.*BEGIN header /, "", f)
+        sub(/ \*\/.*/, "", f)
+        inline_header(f)
+        next
+    }
+    if ($0 ~ /\/\* END header .+ \*\//) {
+        print
+        next
+    }
+
+    # Inject .c files at markers
+    if ($0 ~ /\/\* BEGIN core \*\//) {
+        print
+        strip_inject("termbox2.c")
+        next
+    }
+    if ($0 ~ /\/\* END core \*\//) {
+        print
+        next
+    }
+    if ($0 ~ /\/\* BEGIN platform posix \*\//) {
+        print
+        strip_inject("tb_posix.c")
+        next
+    }
+    if ($0 ~ /\/\* END platform posix \*\//) {
+        print
+        next
+    }
+    if ($0 ~ /\/\* BEGIN platform wasm \*\//) {
+        print
+        strip_inject("tb_wasm.c")
+        next
+    }
+    if ($0 ~ /\/\* END platform wasm \*\//) {
+        print
+        next
+    }
+
+    print
+}