use correct exit code when called with double pipe (||) - #208
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less supports calling LESSOPEN with a double pipe since v447, like LESSOPEN='||/usr/bin/lesspipe.sh %s'. When using it this way, less can differentiate between a lesspipe that returns an actually empty file and the case when lesspipe doesn't want to interfere and tells less to directly open the file by using a non-zero returncode. This allows for example to use the follow (+F) mode. Before this patch lesspipe.sh already had partial support for the double pipe call. This is done by detecting the double pipe call and setting $retval. But this mechanism wasn't used for .lessignore and when less was called with "+F". This patch extends support for those codepaths too.
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less supports calling LESSOPEN with a double pipe since v447, like
LESSOPEN='||/usr/bin/lesspipe.sh %s'. When using it this way, less
can differentiate between a lesspipe that returns an actually empty
file and the case when lesspipe doesn't want to interfere and tells
less to directly open the file by using a non-zero returncode.
This allows for example to use the follow (+F) mode.
Before this patch lesspipe.sh already had partial support for the
double pipe call. This is done by detecting the double pipe call and
setting $retval.
But this mechanism wasn't used for .lessignore and when less was
called with "+F". This patch extends support for those codepaths too.
Apply this pull request after #207
to prevent conflicts.