bin/archdep-filter: cosmetic cleanups

"-a arch" is not requisite either; and having bunches of empty lines in the resulting pkglists that are user visible at least within the conventional installer's alterator-pkg (groups selection) module wouldn't be nice. I chose to sacrifice empty-line separators for clarity; the really good cleanup would save *single* empty lines between chunks of non-empty ones (not at the pkglist's start or end); feel free to implement that as well.

bin/archdep-filter: cosmetic cleanups
b963e9bf · Michael Shigorin · Anton Midyukov · 1b5b309b · b963e9bf
Commit b963e9bf authored Nov 22, 2021 by Michael Shigorin Committed by Anton Midyukov Dec 04, 2021
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archdep-filter bin/archdep-filter +2 -2

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--- a/bin/archdep-filter
+++ b/bin/archdep-filter
@@ -2,7 +2,7 @@
 # filter stdin or file for words related to
 # the specified target architecture
 #
-# args: -a arch [-i file]
+# args: [-a arch] [-i file]

 if [ "$1" = "-a" -a -n "$2" ]; then
 	a="$2"
@@ -43,7 +43,7 @@ sed -rn "s/\<([^@ ]*)\>|\<([^@ ]*)@$a\>[^ ]*\>/\1\2/pg" |
 sed -rn "s/\<([^@ ]*)\>|\<[^ ]*@\!$a\>[^ ]*\> */\1/pg" |
 sed -r  "s/\<([^@ ]*)@\![^ ]+\>/\1/g" |
 sed -r  "s/\<([^@ ]*)@[^@ ]+\> *//g" |
-sed -r  "s/^ +//;s/ +$//" |
+sed -r  "s/^ +//;s/ +$//;/^$/d" |
 if [ -n "$f" ]; then
 	cat > "$t" && mv "$t" "$f"
 else