Fix non-interactive with param -i in subprocess

AUTHORS

@@ -110,3 +110,4 @@
 * Andrey Vlasovskikh <andrey.vlasovskikh@gmail.com>
 * Joseph LaFreniere <joseph@lafreniere.xyz>
 * Daniel Tan <danieltanfh95@gmail.com>
+* Zhan Tang <tz59pk@gmail.com>

hy/cmdline.py

@@ -262,10 +262,7 @@ def proc_opt(opt, arg=None, item=None, i=None):
         return 0
     elif action == "run_script_stdin":
         sys.argv = argv
-        if repl:
-            source = sys.stdin
-            filename = 'stdin'
-        else:
+        if not repl:
             return run_command(sys.stdin.read(), filename="<stdin>")
     elif action == "run_script_file":
         sys.argv = argv

tests/test_bin.py

@@ -79,6 +79,10 @@ def test_stdin():
     assert "RS" in out
     assert "TU" in out
 
+    # With it, the REPL variable must exists, like ps1
+    out, _ = run_cmd("hy -i", '(import sys) (bool (getattr sys "ps1" sys.flags.interactive))')
+    assert "True" in out
+
 
 def test_error_parts_length():
     """Confirm that exception messages print arrows surrounding the affected