Add source amalgamation

The amalgamated source concatenates all sources
to a file janet.c which can be used for
embedding janet, much in the same way as sqlite
or mongoose.

tools/amalg.janet

@@ -0,0 +1,65 @@
+# Creates an amalgamated janet.c and janet.h to
+# allow for easy embedding
+
+(def {:year YY :month MM :month-day DD} (os/date))
+
+# Order is important here, as some headers
+# depend on other headers.
+(def headers
+  @["src/core/util.h"
+    "src/core/state.h"
+    "src/core/gc.h"
+    "src/core/vector.h"
+    "src/core/fiber.h"
+    "src/core/regalloc.h"
+    "src/core/compile.h"
+    "src/core/emit.h"
+    "src/core/symcache.h"])
+
+(def sources
+  @["src/core/abstract.c"
+    "src/core/array.c"
+    "src/core/asm.c"
+    "src/core/buffer.c"
+    "src/core/bytecode.c"
+    "src/core/capi.c"
+    "src/core/cfuns.c"
+    "src/core/compile.c"
+    "src/core/corelib.c"
+    "src/core/debug.c"
+    "src/core/emit.c"
+    "src/core/fiber.c"
+    "src/core/gc.c"
+    "src/core/io.c"
+    "src/core/marsh.c"
+    "src/core/math.c"
+    "src/core/os.c"
+    "src/core/parse.c"
+    "src/core/peg.c"
+    "src/core/pp.c"
+    "src/core/regalloc.c"
+    "src/core/run.c"
+    "src/core/specials.c"
+    "src/core/string.c"
+    "src/core/strtod.c"
+    "src/core/struct.c"
+    "src/core/symcache.c"
+    "src/core/table.c"
+    "src/core/tuple.c"
+    "src/core/util.c"
+    "src/core/value.c"
+    "src/core/vector.c"
+    "src/core/vm.c"
+    "src/core/wrap.c"])
+
+(print "/* Amalgamated build - DO NOT EDIT */")
+(print "/* Generated " YY "-" (inc MM) "-" (inc DD)
+       " with janet version " janet/version "-" janet/build " */")
+(print ```#define JANET_AMALG
+#include "janet.h"```)
+
+(each h headers (print (slurp h)))
+(each s sources (print (slurp s)))
+
+# Relies on this file being built
+(print (slurp "build/core.gen.c"))