[view_curses] only write OSC;send-input in the test env

Fixes #895

NEWS

@@ -1,3 +1,9 @@
+lnav v0.10.1:
+     Bug Fixes:
+     * The text "send-input" would show up on some terminals instead of
+       ignoring the escape sequence.  This control sequence was only
+       intended to be used in the test suite.
+
 lnav v0.10.0:
      Features:
      * Files on remote machines can be viewed/tailed if they are accessible

src/view_curses.cc

@@ -101,9 +101,12 @@ struct utf_to_display_adjustment {
 
 void view_curses::awaiting_user_input()
 {
+    static const bool enabled = getenv("lnav_test") != nullptr;
     static const char OSC_INPUT[] = "\x1b]999;send-input\a";
 
-    write(STDOUT_FILENO, OSC_INPUT, sizeof(OSC_INPUT) - 1);
+    if (enabled) {
+        write(STDOUT_FILENO, OSC_INPUT, sizeof(OSC_INPUT) - 1);
+    }
 }
 
 void view_curses::mvwattrline(WINDOW *window,

test/test_tui.sh

@@ -4,6 +4,7 @@
 unset SSH_CONNECTION
 
 lnav_test="${top_builddir}/src/lnav-test"
+export lnav_test
 
 for fn in ${srcdir}/tui-captures/*; do
     base_fn=`basename $fn`