Add `m2ctx.py`

1 files changed, 90 insertions, 0 deletions

diff --git a/tools/m2ctx.py b/tools/m2ctx.py
new file mode 100755
index 00000000..17811919
--- /dev/null
+++ b/tools/m2ctx.py
@@ -0,0 +1,90 @@
+#!/usr/bin/env python
+
+import sys
+import pyperclip
+import subprocess
+import os
+from pathlib import Path
+
+CXX_FLAGS = [
+    '-Iinclude'
+]
+
+script_dir = Path(os.path.dirname(os.path.realpath(__file__)))
+root_dir = script_dir / ".."
+
+program = os.path.basename(sys.argv[0])
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+def print_usage():
+    eprint(f"Usage: {program} INFILE [-f OUTFILE] [-c] [-e ENCODING] [-v]")
+    eprint("    INFILE     \tInput file to preprocess")
+    eprint("    -f OUTFILE \tOutput context file")
+    eprint("    -c         \tCopy output to clipboard")
+    eprint("    -e ENCODING\tInput file encoding (Default: Shift-JIS)")
+    eprint("    -v         \tVerbose error output")
+
+if len(sys.argv) == 1:
+    print_usage()
+    exit(1)
+
+
+in_file = None
+out_file = None
+clipboard = False
+encoding = "Shift-JIS"
+verbose = False
+i = 1
+while i < len(sys.argv):
+    arg = sys.argv[i]
+    if arg == "-f":
+        i += 1
+        if i >= len(sys.argv):
+            eprint("Expected output file after -f")
+            exit(1)
+        out_file = sys.argv[i]
+    elif arg == "-c":
+        clipboard = True
+    elif arg == "-e":
+        i += 1
+        if i >= len(sys.argv):
+            eprint("Expected input file encoding after -e")
+            exit(1)
+        encoding = sys.argv[i]
+    elif arg == "-v":
+        verbose = True
+    elif arg.startswith("-"):
+        eprint(f"Unknown option '{arg}'")
+    elif in_file is None:
+        in_file = arg
+    else:
+        eprint(f"Duplicate input file '{arg}'")
+        exit(1)
+    i += 1
+
+
+try:
+    ctx = subprocess.check_output(['gcc', '-E', '-P', '-undef', '-dD', *CXX_FLAGS, in_file], cwd=root_dir, encoding=encoding)
+except subprocess.CalledProcessError as e:
+    eprint(f"Failed to preprocess '{in_file}'")
+    if verbose: eprint(e)
+    else: eprint("Use -v for more verbose error output")
+    exit(1)
+
+
+if out_file:
+    try:
+        with open(out_file, "w") as file:
+            file.write(ctx)
+    except OSError as e:
+        eprint(f"Failed to write file '{out_file}'")
+        if verbose: eprint(e)
+        else: eprint("Use -v for more verbose error output")
+        exit(1)
+if clipboard:
+    pyperclip.copy(ctx)
+    eprint("Copied context to clipboard")
+if out_file is None and not clipboard:
+    print(ctx)