Hello Dan and Noah, I think the following idea is execllent: On Mon, Jan 17, 2005 at 01:37:03PM -0800, Noah Misch wrote: > If you wanted to avoid excluding any delimiter, you do something like this: > > for ac_var in var1 var2 ... varN > do > eval "case \$$ac_var in > *' > '*) filter=' | sed '\\''\$q;s/\$/\\\\/'\\' ;; > *) filter= ;; > esac" > > eval echo \"s,@$ac_var@,\$$ac_var,\;t t\" $filter > done | existing_cleanup_seds The code still isn't perfectly correct, though: what if a one line value happens to end with a backslash? How can you distinguish it from a multiline value. And I would use a more readable way to implement it: for ac_var in var1 var2 ... varN do eval ac_val="\"\$$ac_var\"" case $ac_val in *' '*) echo "@$ac_var@$ac_val" | sed ...encode... ;; *) echo "$ac_var@$ac_val" esac done | sed ... The "encode" sed program would take care to encode things properly, for example 's/\\/\\x/g;$q;s/$/\\/' . (The main point is that we have to escape real backslashes somehow.) The post-processing program would recognize lines starting with @, and decode them, for example: /^@/!b ok s/^@// :loop N /\\$/b loop s/\\x/\\/g :ok s/[\\\\&,]/\\\\&/g s/[^@]*@/s,@&,/ s/$/,;t t/ Thanks to Noah's idea, the value can be any string, yet the performance is fine. I'm looking forward to see your code, Dan. Have a nice day, Stepan Kasal _______________________________________________ Autoconf mailing list Autoconf@xxxxxxx http://lists.gnu.org/mailman/listinfo/autoconf
