proj: Add intercept command

.gitignore

@@ -2,3 +2,4 @@
 bin/
 *.so
 *.o
+*.log

proj/intercept/intercept

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import argparse
+import subprocess
+import os
+import sys
+
+
+def main() -> None:
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-f', '--functions')
+    mode = parser.add_mutually_exclusive_group()
+    mode.add_argument('-l', '--log')
+    mode.add_argument('-i', '--intercept')
+    args, extra = parser.parse_known_args()
+    if len(extra) > 0 and extra[0] == '--':
+        extra.pop(0)
+
+    if args.intercept:
+        intercept = args.intercept
+    elif args.log:
+        intercept = 'file:' + args.log
+    else:
+        intercept = 'stderr'
+    subprocess.run(extra, stdin=sys.stdin, env={
+        'LD_PRELOAD': os.getcwd() + '/intercept.so',
+        'INTERCEPT': intercept,
+        'INTERCEPT_FUNCTIONS': args.functions or '*',
+    })
+
+
+if __name__ == '__main__':
+    main()