[Libguestfs] [libguestfs-common PATCH 2/3] Tools_utils.wrap: only wrap text for TTYs

Whenever stdout and/or stderr is redirected (usually to a regular file), users mostly do that to capture logs, for later searching. Wrapping interferes with grep though, so make "wrap" just print the string when the output channel is not a TTY. The requested indentation is honored though. Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1820221 Signed-off-by: Laszlo Ersek <lersek(a)redhat.com&gt; --- Notes: Easily testable e.g. with virt-resize: $ guestfish -N fs:ext4 exit $ truncate -s 2G test1.resized.img $ virt-resize --expand /dev/sda1 test1.img test1.resized.img $ virt-resize --expand /dev/sda1 test1.img test1.resized.img > log $ cat log mltools/tools_utils.ml | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mltools/tools_utils.ml b/mltools/tools_utils.ml index 06ba2f7ab295..4c5188988e03 100644 --- a/mltools/tools_utils.ml +++ b/mltools/tools_utils.ml @@ -126,8 +126,13 @@ let message fs = type wrap_break_t = WrapEOS | WrapSpace | WrapNL let rec wrap ?(chan = stdout) ?(indent = 0) str = - let len = String.length str in - _wrap chan indent 0 0 len str + if istty chan then + let len = String.length str in + _wrap chan indent 0 0 len str + else ( + output_spaces chan indent; + output_string chan str + ) and _wrap chan indent column i len str = if i < len then ( -- 2.19.1.3.g30247aa5d201