[cmds] the output of the :pipe commands should go to the top of the output stack and not to a temp file

src/command_executor.cc

@@ -731,6 +731,7 @@ int sql_callback(exec_context &ec, sqlite3_stmt *stmt)
 
 future<string> pipe_callback(exec_context &ec, const string &cmdline, auto_fd &fd)
 {
+    if (lnav_data.ld_output_stack.empty()) {
         auto pp = make_shared<piper_proc>(fd, false);
         static int exec_count = 0;
         char desc[128];
@@ -754,6 +755,23 @@ future<string> pipe_callback(exec_context &ec, const string &cmdline, auto_fd &f
         task();
 
         return task.get_future();
+    } else {
+        return std::async(std::launch::async, [&]() {
+            FILE *file = lnav_data.ld_output_stack.top();
+            char buffer[1024];
+            ssize_t rc;
+
+            if (file == stdout) {
+                lnav_data.ld_stdout_used = true;
+            }
+
+            while ((rc = read(fd, buffer, sizeof(buffer))) > 0) {
+                fwrite(buffer, rc, 1, file);
+            }
+
+            return string();
+        });
+    }
 }
 
 void add_global_vars(exec_context &ec)

test/test_cmds.sh

@@ -562,10 +562,12 @@ check_output "pipe-to is not working" <<EOF
 EOF
 
 run_test ${lnav_test} -n \
+    -c ":echo Hello, World!" \
     -c ":goto 2" \
     -c ":pipe-line-to sed -e 's/World!/Bork!/g' -e 's/2009//g'" \
     ${test_dir}/logfile_multiline.0
 check_output "pipe-line-to is not working" <<EOF
+Hello, World!
 -07-20 22:59:30,221:ERROR:Goodbye, Bork!
 EOF