m2ctx for usage with decomp.me

.gitattributes

@@ -1,2 +1,3 @@
 *.sha1 text eol=lf
 charmap.txt text eol=crlf
+m2ctx.sh text eol=lf

.gitignore

@@ -53,3 +53,5 @@ files/**/*.c
 
 # MacOS garbage
 .DS_Store
+#decomp.me helper files
+ctx.c

m2ctx.sh

@@ -0,0 +1,40 @@
+#!/usr/bin/env bash
+
+OUT_FILE=ctx.c
+
+GCC=gcc
+FLAGS="-E -P -dD -undef"
+INCLUDES="-Iinclude -Iinclude/constants -Iinclude/nitro -Iinclude-mw -Ifiles -Iarm9/lib/NitroSDK/include -Iarm9/lib/libc/include -Iarm9/lib/libnns/include -Iarm9/modules/21/include -Iarm9/modules/52/include -Iarm9/modules/59/include -include global.h"
+DEFINES="-DDIAMOND"
+
+
+generate-ctx () {
+    # Remove any line containing a predefined macro. If not removed, mwccarm
+    # generates compiler warnings.
+    grep "^#include " "$1" | $GCC $FLAGS $INCLUDES $DEFINES  -x c - | sed '/__STDC__\|__STDC_VERSION__\|__STDC_VERSION__\|__STDC_HOSTED__/d' > $OUT_FILE
+}
+
+usage () {
+    echo "Generate a context file for decomp.me."
+    echo "Usage: $0 [-h] [FILEPATH]"
+    echo ""
+    echo "Arguments:"
+    echo "  FILEPATH      Source file used to generate ctx.c"
+    echo ""
+    echo "Options:"
+    echo "  -h            Show this message and exit"
+}
+
+while [[ $# -gt 0 ]]; do
+  key="$1"
+  case $key in
+  -h)
+    usage
+    exit 0
+    ;;
+  *)
+    generate-ctx "$1"
+    exit 0
+    ;;
+  esac
+done