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From: | david.chappaz |
Subject: | bug#46801: Autodetection of grep-use-null-device |
Date: | Fri, 26 Feb 2021 09:10:51 -0800 |
Hi, Here is a simple recipe: 1/ Start emacs with --no-init 2/ Check that grep-use-null-device is set to ‘auto-detect’ 3/ Execute non-interactively (grep "grep --color -nH --null -e something") The command that’s echoed in the grep buffer is: grep --color -nH --null -e something /dev/null 4/ I can see that grep-use-null-device has been set to nil This suggests that automatic detection of grep-use-null-device has taken place. Is this expected after non-interactive invocation ? The documentation seems to suggest that automatic detection of grep-use-null-device should take place on the first *interactive* call, but not before that. Perhaps I don't read the documentation correctly though, it's very possible ! However, if automatic detection of grep-use-null-device after non-interactive Invocation is the correct behavior, then why was /dev/null added to the command despite grep-use-null-device being set to nil ? 5/ Execute non-interactively the same command again: (grep "grep --color -nH --null -e something") The command that’s echoed in the grep buffer now is: grep --color -nH --null -e something This time round, /dev/null is not present. At least this is consistent with grep-use-null-device being set to nil. What doesn't seem right is that the echoed command is not the same as that from step 3/ Any thoughts or comments ? Thanks ! David |
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