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rename.rc: support WEBP, misc. improvements

--- a/sdrip/rename.rc

+++ b/sdrip/rename.rc

@@ -2,11 +2,12 @@

 . ./fns.rc

-rename jpg JPG *.jpg >[2]/dev/null || {}

-rename png PNG *.PNG >[2]/dev/null || {}

+rename webp WEBP -- *.webp >[2]/dev/null || {}

+rename jpg JPG -- *.jpg >[2]/dev/null || {}

+rename png PNG -- *.png >[2]/dev/null || {}

 exiv2 -q --Force -t rename `{lscmd >[2]/dev/null} || true

-sha1sum `{lscmd >[2]/dev/null} | awk '

+sha1sum -- `{lscmd >[2]/dev/null} | awk '

 function quote(s){

 	gsub("''", "''''", s)

 	return sprintf("%s", s)

@@ -16,7 +17,10 @@

 	date=substr($2, 1, 15)

 	match($2, ".[A-Z]+$")

 	fext=substr($2, RSTART+1, RLENGTH-1)

-	printf "mv %s %s.%s.full.%s\n", quote($2), date, hash, fext

+	src=quote($2)

+	dst=sprintf("%s.%s.full.%s", date, hash, fext)

+	if(src != dst)

+		printf "mv -- %s %s\n", src, dst

 	next

 }

 {

@@ -23,5 +27,8 @@

 	hash=$1

 	match($2, ".[A-Z]+$")

 	fext=substr($2, RSTART+1, RLENGTH-1)

-	printf "mv %s misc.%s.full.%s\n", quote($2), $1, fext

+	src=quote($2)

+	dst=sprintf("misc.%s.full.%s", $1, fext)

+	if(src != dst)

+		printf "mv -- %s %s\n", src, dst

 }' | rc