Keep completion words out of shell evaluation

internal/cobra/testdata/completion_terminal.py

@@ -30,6 +30,15 @@ elif shell == "fish":
 else:
     raise SystemExit(f"unsupported shell: {shell}")
 
+tab_only = os.environ.get("PROBE_TAB_ONLY") == "1"
+if tab_only:
+    if shell == "zsh":
+        setup += "; function ck_tab_done { print CK_TAB_FINISHED; }; zle -N ck_tab_done; bindkey '^X^T' ck_tab_done"
+    elif shell == "bash":
+        setup += r"""; bind -x '"\C-x\C-t": "printf CK_TAB_FINISHED"'"""
+    else:
+        raise SystemExit("tab-only probe requires Bash or Zsh")
+
 child = pexpect.spawn(executable, args, env=os.environ.copy(), cwd=os.environ["PROBE_DIR"],
                       encoding="utf-8", timeout=15, dimensions=(24, 120))
 child.delaybeforesend = 0.05
@@ -39,7 +48,11 @@ try:
     child.expect_exact("PROMPT> ")
     child.send(line)
     child.send("\t")
-    if os.environ.get("PROBE_LIST") == "1":
+    if tab_only:
+        child.sendcontrol("x")
+        child.sendcontrol("t")
+        child.expect_exact("CK_TAB_FINISHED")
+    elif os.environ.get("PROBE_LIST") == "1":
         child.send("\t")
         remaining = ["Readable text", "YAML output"]
         captured = []