Improved mips_to_c context script (#214)

* Improved context script

* .gitignore

tools/m2ctx.py

@@ -0,0 +1,63 @@
+#!/usr/bin/python3
+
+import os
+import sys
+import subprocess
+from pathlib import Path
+
+script_dir = os.path.dirname(os.path.realpath(__file__))
+root_dir = script_dir + "/../"
+src_dir = root_dir + "src/"
+
+
+def get_c_dir(dirname):
+    for root, dirs, files in os.walk(src_dir):
+        for directory in dirs:
+            if directory == dirname:
+                return os.path.join(root, directory)
+
+
+def get_c_file(directory):
+    for root, dirs, files in os.walk(directory):
+        for file in files:
+            if file.endswith(".c") and "data" not in file:
+                return file
+
+def import_c_file(in_file):
+    in_file = os.path.relpath(in_file, root_dir)
+    cpp_command = ["cpp", "-P", "-Iinclude", "-Isrc", "-undef", "-D__sgi", "-D_LANGUAGE_C",
+                   "-DNON_MATCHING", "-D_Static_assert(x, y)=", "-D__attribute__(x)=", in_file]
+    try:
+        return subprocess.check_output(cpp_command, cwd=root_dir, encoding="utf-8")
+    except subprocess.CalledProcessError:
+        print(
+            "Failed to preprocess input file, when running command:\n"
+            + cpp_command,
+            file=sys.stderr,
+            )
+        sys.exit(1)
+
+def main():
+    if len(sys.argv) > 1:
+        arg = sys.argv[1]
+        if arg == "-h" or arg == "--help":
+            sys.exit("Usage: ./m2ctx.py path/to/file.c\n" \
+            "or ./m2ctx.py (from an actor or gamestate's asm dir)\n" \
+            "Output will be saved in oot/ctx.c")
+        c_file_path = Path.cwd() / sys.argv[1]
+    else:
+        this_dir = Path.cwd()
+        c_dir_path = get_c_dir(this_dir.name)
+        if c_dir_path is None:
+            sys.exit("Cannot find appropriate c file dir. In argumentless mode, run this script from the c file's corresponding asm dir.")
+        c_file = get_c_file(c_dir_path)
+        c_file_path = os.path.join(c_dir_path, c_file)
+    
+    output = import_c_file(c_file_path)
+
+    with open(os.path.join(root_dir, "ctx.c"), "w") as f:
+        f.write(output)
+
+
+if __name__ == "__main__":
+    main()