List diaries only if output is not a pipe

Beforehand, this command:

    imag diary -d foo list | cat

listed each entry twice because the reporting feature of libimagrt
forwarded the list to stdout and the normal output was written to
stderr.

With this patch, we get the output only once in this case.

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/bin/domain/imag-diary/src/list.rs b/bin/domain/imag-diary/src/list.rs
index 3d07f6fa..2719d11a 100644
--- a/bin/domain/imag-diary/src/list.rs
+++ b/bin/domain/imag-diary/src/list.rs
@@ -57,7 +57,9 @@ pub fn list(rt: &Runtime) {
         .for_each(|id| {
             let _ = rt.report_touched(&id).unwrap_or_exit();
 
-            writeln!(rt.stdout(), "{}", id).to_exit_code().unwrap_or_exit()
+            if !rt.output_is_pipe() {
+                writeln!(rt.stdout(), "{}", id).to_exit_code().unwrap_or_exit()
+            }
         });
 }